Qualification: 
Ph.D, MPhil, MSc
Email: 
s_asha@cb.amrita.edu

Dr. Asha Sathish currently serves as an Associate Professor in Chemistry, Department of Sciences at Amrita School of Engineering, Coimbatore. Her areas of research include Synthesis of organometallic compounds, Biosorption, Biodiesel preparation from algae and its characterization, and Electrodes for the direct methanol fuel cell. She has 18 journal publications in biosorption and Fuel cells. She has guided 4 Ph.D.s among them, two have completed their defense.  She has guided 12 M.Sc projects three M.Tech projects and 4 B.Tech projects. She has also handled UG –Engineering chemistry theory and lab, M.Tech-Electrochemistry theory, Integrated and M.Sc chemistry theory and lab courses. On the whole, she has 17 years of teaching experience and five years of research experience in Chemistry.

Affiliation(s):

  • Assistant Professor(S.G)

Qualification

  • May 2007: Ph. D. (Chemistry)
    Bharathiar University,Coimbatore, India
  • May 1994: M.Phil (Chemistry)
    Manonmanium Sundaranar University,Tirunelveli,India
  • May 1991: M.Sc (Applied Chemistry)
    Madurai Kamaraj University,Madurai, India
  • May 1989: B. Sc. (Chemistry)
    Govt Arts College for Women, Tirunelveli,India

Awards, Certificates, Honors and Societies

  • Member, Board of Studies, Int.M.Sc and M.Sc Chemistry. 2015 and 2020. Amrita Vishwa Vidyapeetham.
  • Life Member in “Indian Journal of Chemical Society.

Research Interest

  • Area of Interest
    • Interest 1: Synthesis and Characterization of organometallics
    • Interest 2: Biosorption
    • Interest 3: Electrodes for direct methanol fuel cell
    • Algae cultivation and biodiesel preparation
  • Keywords:
    • Heavy metal removal from waste water using nanoparticle
    • low cost transition metal based electrodes for direct methanol fuel cell and algae cultivation and biodiesel preparation.
  • Research Group
    • Present Team:
      • Dr. K.Nithya – Chemical Engineering
      • Dr. R. Yamuna – Sciences
      • Ms. T.S Boopathi

Funded Project

Sponsored Projects (Status)
Years Funding Agency Title of the Project Amount of Grant (Rs.) Investigators Status
Three (2016 -2019) DST Green, Compact and Rapid Visual Sensing of Pb (II)Ions Using Ixora Coccinea Floral Dye Coated Ear Buds 10 Lakhs Dr V. Swarnalatha (PI)  Dr Asha Sathish (CoPI) Completed

Teaching

  • UG Theory:
    • B.Tech Engineering Chemistry
    • Inorganic chemistry I
    • Analytical Chemistry
    • Inorganic Chemistry II
    • PG/Ph.D theory
    • Electrochemistry
    • Coordination Chemistry
    • Instrumental Methods of Analysis
  • UG Labs
    • Engineering chemistry lab
    • Instrumental Lab – Physical Chemistry
  • PG Labs
    • Advanced Physical Chemistry Lab
    • Instrumental Analysis lab

Publications

Publication Type: Journal Article

Year of Publication Title

2020

S. M, Dr. Asha Sathish, and T, R., “Nickel boride and cobalt boride coated stainless steel gauze for enhanced electrochemical oxidation of methanol”, Ionics, vol. 26, no. 4, pp. 1875 - 1884, 2020.[Abstract]


Ni-Co-B catalyst consisting of different ratios of Ni and Co was successfully synthesized via a simple electroless deposition method on stainless steel (SS) gauze substrate. Among various ratios, the Ni-Co-B of the ratio (0.09 M/0.01 M, designated as Ni-Co-B-MR1) exhibited higher electrochemical response towards methanol oxidation in alkaline medium with a highest current density about 11.3 mA/cm2 at a potential of − 0.65 V. The electrode exhibited improved CO tolerance for methanol oxidation reaction (MOR) in alkaline medium. The surface morphology and composition of the SS gauze coated with Ni-Co-B-MR1 catalyst was analysed using SEM and energy dispersive X-ray analysis. XRD confirms the presence of orthorhombic nickel boride and cobalt boride structure. The XPS analysis confirms the active presence of nickel boride and cobalt boride on SS gauze coated with Ni-Co-B-MR1 catalyst. The BET surface area of SS gauze coated with Ni-Co-B-MR1 catalyst was 1.21 m2 g−1. The single direct methanol fuel cell with SS gauze coated with Ni-Co-B-MR1 electrode produces a current density of about 0.1 mA/cm2 and power density about 10 mW/cm2, respectively.

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2020

K. Athira, Dr. Asha Sathish, Nithya K., and Guhananthan, A., “Corn cob immobilised Chlorella sorokiniana for the sequestration of chromium ions from aqueous solution”, Materials Today: Proceedings, 2020.[Abstract]


In the present study the microalgae (Chlorella sorokiniana) immobilized on corn cob was examined for the removal of chromium ions from aqueous solution. The efficiency of the algae inoculated corn cob was compared with that of free corn cob and free algal species. The algal species were inoculated into the matrix of corn cob in order to increase its performance as the biosorbent. Algae inoculated corn cob was found to show 25% better chromium removal efficiency. The parameters influencing the adsorption like concentration, pH, contact time was optimized through batch studies. The maximum adsorption efficiency shown by the inoculated corn cob was 11.24 mg/g. The chromium biosorption showed maximum efficiency after 16 h of contact time. The biosorption process was well explained by the Langmuir isotherm model and it followed the pseudo-second-order kinetics. The sorption process was pH dependent and maximum chromium removal efficiency was obtained at a pH of 2.5. For regeneration of the adsorbent, 0.1 N NaOH is used as the eluting agent. The regeneration studies confirmed that 60% of the sorbed chromium was eluted in two hours.

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2020

G. Govindankutty, S. Hareendran, Dr. Asha Sathish, and Nithya K., “Controlled functionalisation of graphene oxide using ethylene diamine: a one-pot synthesis approach for chromium sorption”, Micro Nano Letters, vol. 15, no. 12, pp. 817-821, 2020.[Abstract]


Introduction of ethylene diamine into the layers of graphene oxide was achieved through direct compounding method. Graphene oxide intercalated with ethylene diamine was characterised by Fourier transform-infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermo gravimetric analysis (TGA) and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX) techniques. The efficiency of the material in adsorbing chromium was evaluated through batch scale studies by optimising parameters like pH, concentration and contact time. The material renders a monolayer adsorption capacity of 69.93 mg/g, at pH 1 within 60 min time period for a minimal dosage of 0.05 g. The ethylene diamine modified graphene oxide thus appeals to be a promising adsorbent for environmental applications.

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2020

S. Mohan, Govindankutty, G., Dr. Asha Sathish, and Nithya K., “Spirulina platensis-capped mesoporous magnetic nanoparticles for the adsorptive removal of chromium”, The Canadian Journal of Chemical Engineering, 2020.[Abstract]


Abstract The magnetic nanoparticles prepared through the co-precipitation method were surface modified using Spirulina platensis. The mesoporous and superparamagnetic nature of the adsorbent was confirmed by Brunauer-Emmett-Teller (BET) and vibrating sample magnetometer (VSM) analyses, respectively. Further, an increased specific surface area of 75.3 m2/g was reported in the BET studies. Parameters such as pH, contact time, concentration, and temperature were studied to optimize the operating conditions influencing adsorption. Thermodynamic studies justified the spontaneity and endothermic nature of adsorption. The adsorbent exhibited a better performance at 1.5 pH and 120 minutes of contact time. The monolayer adsorption capacity of the material was found to be 29.23 mg/g from the evaluation of Langmuir adsorption isotherm. The second- order kinetic studies suggest the predominance of chemisorption. Further, the X-ray photoelectron spectroscopy (XPS) studies confirmed that the adsorption mechanism is electrostatic attraction accompanied by reduction. Notably, a regeneration efficiency of 75.26% was achieved with NaOH as the desorbing agent.

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2020

Nithya K., Dr. Asha Sathish, and Senthil Kumar P., “Packed bed column optimization and modeling studies for removal of chromium ions using chemically modified Lantana camara adsorbent”, Journal of Water Process Engineering, vol. 33, p. 101069, 2020.[Abstract]


The current study proposes to address the growing concerns related to chromium discharges from metal plating facilities. For this purpose, acid treated Lantana camara is synthesized and continuous adsorption experiments were conducted on the fixed bed column set up. Some of the desirable attributes of the adsorbent are their favourable functional groups and the porous nature. These findings are reported in the FTIR and SEM analyses as well. In the column experiments run using laboratory simulated solution, considerably, the highest adsorption capacity of 362.8 mg/g is obtained. Since these results are favourable, column experiments have also been performed on composite electroplating effluents containing chromium ions. Notably, for composite electroplating effluents, maximum bed capacity of 50.05 mg/g is obtained. Another key point is the favourable breakthrough time reported for 100 mg/L chromium solution, which is 1260 min. Further, models such as Thomas, Yoon -Nelson, and Bed Depth Service Time (BDST) have also shown excellent fits. On the whole, the results revealed that the developed column is effective in handling effluent-containing chromium. Besides, this study also provides a better understanding of the adsorption process in composite industrial effluents.

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2020

Nithya K., Dr. Asha Sathish, and Senthil Kumar P., “Magnetite encapsulated alginates tailored material for the sustainable treatment of electroplating industrial wastewater: column dynamics and mass transfer studies”, Clean Technologies and Environmental Policy, 2020.[Abstract]


The current study proposes the use of magnetic beads for the treatment of nickel ions of the industrial wastewater system. More specifically, the removal of nickel ions is studied in single and multi-metal ion systems which enabled the scalability of nano-enabled technology to industrial systems. The current synthesis neither involves expensive precursors nor complex procedures. Indeed, the improved surface properties of the adsorbent are due to the use of Lantana camara, in the synthesis. The surface properties and functional attributes of the magnetic beads were characterized by FTIR and SEM analyses. The breakthrough experiments were done for selected column depths, varying feed flow rates and metal ion concentrations. In particular, the interventions of the interfering ions of the electroplating effluents are captured in the breakthrough analysis. Besides the lowest bed capacity reported in the multi-metal systems, the column operated with nickel ions showed a maximum bed capacity of 12.36 mg/g at a flow rate of 2 mL/min in the 20 cm bed. Furthermore, an extended breakthrough time of 780 min is obtained for 50 mg/L nickel ion solution at a flow rate of 2 mL/min. In addition, the modelling of breakthrough curves using Thomas, Yoon–Nelson and BDST models have shown reasonable fits. In addition, repeated cycles of regeneration studies showed improved efficiency of 65% in the first cycle. More specifically, the alginate validated the selective preferential adsorption of cationic substances over anionic components in the studied column.

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2019

M. Sunitha, Dr. Asha Sathish, ,, and Rangarajan, M., “Ni–Zn–P catalyst supported on stainless steel gauze for enhanced electrochemical oxidation of methanol for direct methanol fuel cell application”, Materials Research Express, vol. 6, p. 095504, 2019.[Abstract]


Ni–Zn–P catalyst of different chemical compositions is successfully synthesized via simple electroless deposition method on stainless steel (SS) gauze substrate. The electrocatalytic properties of Ni–Zn–P/SS gauze is investigated towards methanol oxidation in an alkaline medium. The Ni80Zn12P8 catalyst coated on SS gauze exhibits higher and more durable electrocatalytic activities with an excellent current density (10.2 mA cm−2) at a negative potential (−0.6 V). The modified electrode is characterized by SEM, and EDX techniques to determine the surface morphology and composition of the catalyst deposited. XRD confirms the presence of hexagonal Ni2P, tetragonal Zn3P2, and cubic Ni–P structure. The surface properties investigated using XPS analysis indicate the presence of the nickel phosphide and zinc phosphide linkage. The BET surface area for Ni80Zn12P8 catalyst coated SS gauze is 6.661 m2g−1. The current density and power density obtained from single fuel cell performance on Ni80Zn12P8/SS electrode for 1 M methanol are 0.107 mA cm−2 and 9.5 mW cm−2, respectively.

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2019

G. Gokulan, Nagarajan, D., Dr. Swarnalatha V, and Dr. Asha Sathish, “Ixora Coccinea floral extract coated ear buds – Highly selective and eco-friendly sensor for the detection of Pb(II) ions”, Journal of Environmental Chemical Engineering, vol. 7, p. 103230, 2019.[Abstract]


The process of identifying the presence of heavy metals in water is crucial in industries causing heavy metal pollution so that apt treatment processes can be followed. Visual detection serves as an effective qualitative detection method, in which a particular metal can be selectively identified by colour changes. For the first time, a highly selective visual detection procedure of Pb(II) in water is reported using a floral extract. The flowers of Ixora coccinea have been chosen for our study because of its easy availability and non-toxicity. Nine different metals such as Ni(II), Cu(II), Fe(II), Fe(III), Hg(II), Zn(II), Cd(II), Pb(II) and Cr(VI) were investigated using ethanolic extract of the flower under basic condition. Among the nine different metals, the floral extract responded positively only for Pb(II). The extract was coated on top of common ear buds and observed for colour change just by dipping it in metal ion solutions. Coating on the ear buds enhanced the ease through which we could recognize the presence of Pb(II) just by “dip and look” procedure. The interference from co-existing cations and anions with the detection method was investigated. The detection limit using the suggested method was found to be 0.4 ppm. The UV and GC–MS results prove that the selective colouration is due to the complex formation of flavonols in the extract with Pb(II). The proposed method also answered positively while tested for an industrial effluent containing 4 ppm Pb(II) ion. Thus, a novel receptor based on a natural extract has been developed and verified for sensing Pb(II) ions using easy-to-use tool like ear buds, which can be viable by small-scale industries from developing countries.

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2019

K. Nithya, Dr. Asha Sathish, K. Pradeep, and S. Kiran Baalaji, “Algal biomass waste residues of Spirulina platensis for chromium adsorption and modeling studies”, Journal of Environmental Chemical Engineering, vol. 7, p. 103273, 2019.[Abstract]


The current study is an attempt to utilize the waste algal biomass of Spirulina platensis obtained after biodiesel production. The research specifically focuses on employing these biomasses for carrying out the adsorption studies on chromium. The algal samples used in the study were subjected to FTIR, TGA and SEM analyses respectively. In addition, through EDX analyses the possible chemical elements of the algal species before and after biodiesel extraction was identified. The adsorption capacity of the biodiesel extracted biomass is found to be 45.5 mg/g for chromium ions. This phenomenon explains the fact that even after the extraction of biodiesel, the algal species still possess some of the desired functionalities required for the adsorption process. The study as well investigates the effect of selected adsorption process parameters in the uptake of metal ions. The temperature studies showed that the maximum adsorption efficiency is observed at 60 °C favouring the endothermic type of adsorption. Further, a maximum desorption efficiency of 82.5% and 70.4% which is reported for pure algal and biodiesel extracted algal samples respectively are favourable results. Additionally, the adsorption mechanisms were interpreted using isotherm, kinetic, diffusion and thermodynamic models.

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2018

S. M, Dr. Asha Sathish, Durgadevi, N., and Ramachandran, T., “Electrochemical investigation of Metal- Malonyldihydrazide complexes for Direct Methanol Fuel Cell Application”, Materials Today: Proceedings, vol. 5, pp. 16646-16657, 2018.[Abstract]


Developing active and high efficient electro catalyst for the methanol oxidation is very important for the large scale commercialization of Direct Methanol Fuel Cell (DMFC). Here we report the metal-complex based catalyst providing a large potentiality to generate a new function compared to metal alloy catalysts. We formulated Iron malonyl dihydrazide, Copper malonyl dihydrazide, and Cobalt malonyl dihydrazide complexes by simple chemical synthesis. The prepared catalysts were characterized by the IR studies to confirm the metal-complex formation. The prepared catalysts were coated on the stainless steel mesh substrate with the incorporation of carbon powder. The modified electrodes were investigated for the methanol oxidation in 0.5M sulphuric acid medium through Cyclic Voltammetry. The results indicate Fe- malonyldihydrazide (abbreviated as Fe-MDH) complex shows efficient electro oxidation of methanol with better stability during long term potential cycling. The Fe-MDH modified electrode oxidizes the methanol at around 0.6V. The studies were optimized by varying the Fe-MDH ratio with carbon powder, catalyst drying temperature and concentration of the acidic medium. The modified Fe-MDH electrode was characterized using BET surface analysis, XRD, SEM analysis. Fuel cell performance was carried out which shows current density about 77mA/cm2.

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2018

K. Nithya, Dr. Asha Sathish, P. Kumar, S., and T. Ramachandran, “Fast kinetics and high adsorption capacity of green extract capped superparamagnetic iron oxide nanoparticles for the adsorption of Ni(II) ions”, Journal of Industrial and Engineering Chemistry, vol. 59, pp. 230-241, 2018.[Abstract]


Superparamagnetic iron oxide nanoparticles were synthesized using co-precipitation technique by dissolving required stoichiometric proportions (1:2) of Fe2+ and Fe3+ salts in water. Lantana camara extract and ammonia solution were used as the stabilizing and precipitating agents, respectively. The prepared particles were characterized using FTIR, TGA, PSA, SEM–EDAX and zeta potential analysis. This material was successfully adopted for the removal of Ni(II) ions from aqueous solution and the process parameters were optimized. The results indicated the faster kinetics and a remarkably higher adsorption capacity of 227.20mg/g at a pH of 6.0 and an adsorbent dose of 0.05g.

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2018

Gopika G., Nithya K., and Dr. Asha Sathish, “Adsorption studies of amine-modified green synthesized Fe3O4 nanoparticles for the removal of nickel from aqueous solution”, Desalination and Water Treatment, vol. 121, pp. 53-64, 2018.

2018

M. Sunitha, Durgadevi, N., Dr. Asha Sathish, and T. Ramachandran, “Performance evaluation of nickel as anode catalyst for DMFC in acidic and alkaline medium”, Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology, vol. 46, pp. 592-599, 2018.[Abstract]


Direct methanol fuel cell (DMFC) research is highly focused due to its high energy density, portability and inexpensive. In the present study conventional platinum catalyst used for methanol oxidation is being replaced with nickel catalyst supported over nickel mesh. The electrode is synthesized by single step electro deposition technique. Synthesized electrode was characterized by SEM, EDAX and AFM techniques to know the surface morphology, composition and thickness of the catalyst respectively. The electro catalytic behavior of the nickel for methanol oxidation was evaluated using cyclic voltammetry technique. As the DMFC is compatible with both the acidic and alkaline electrolytes the working of the nickel mesh electrode is analyzed in both media. The results showed maximum current density of 0.025 and 0.030 A/cm2 in alkaline and acidic medium respectively with less potential around 0.4 and 0.2 V. The other parameters such as varying the concentration of methanol, electrolyte medium, scan rate and thickness of the catalytic layer were analyzed and optimized. © 2018, Science Press. All right reserved.

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2017

N. K, Dr. Asha Sathish, Ponnusamy, S. Kumar, and Ramachandran, T., “Functional group assisted green synthesized superparamagnetic nanoparticles for the rapid removal of hexavalent chromium from aqueous solution”, IET Nanobiotechnology, vol. 11, 2017.

2017

N. K, Dr. Asha Sathish, Ponnusamy, S. Kumar, and Ramachandran, T., “An insight into the prediction of biosorption mechanism, and isotherm, kinetic and thermodynamic studies for Ni(II) ions removal from aqueous solution using acid treated biosorbent: The Lantana camara fruit”, DESALINATION AND WATER TREATMENT, vol. 80, pp. 276-287, 2017.

2016

Nithya K., Dr. Asha Sathish, Kumar, PcSenthil, and Dr. Ramachandran T., “Biosorption of hexavalent chromium from aqueous solution using raw and acid-treated biosorbent prepared from Lantana camara fruit”, Desalination and Water Treatment, vol. 57, no. 27, pp. 25097-25113, 2016.[Abstract]


The aim of the present investigation was to explore the performance of the acid-treated Lantana camara fruit biosorbent in binding hexavalent chromium from aqueous solutions. FTIR studies revealed the contribution of carbohydrates, glycosides, and flavonoids in the biosorbent. EDS analysis exhibited the occurrence of chromium ions after biosorption, whereas SEM image exposed the enhancement of porosity after acid treatment. The isotherm models such as Langmuir, Freundlich, Dubinin–Radushkevich, and Temkin models were studied to depict the mechanism of interaction of the biosorbent with the adsorbate. Besides isotherm models, kinetic studies like pseudo-first-order, pseudo-second-order, and intraparticle diffusion models were also performed to validate the controlling mechanism of biosorption. Langmuir model showed a better fit favoring monolayer adsorption and a high correlation value from the pseudo-second-order model suggests chemisorption. To understand whether the biosorption process releases or absorbs energy, thermodynamic analysis was carried out. The outcome of the findings showed endothermic nature of the process with increased randomness at the solid solution interface. Regeneration studies showed better results with 0.2 M NaOH solutions. The obtained maximum uptake capacity of 83 mg/g with a minimal biomass dosage proves the credible potential of the selected biosorbent in removing toxic hexavalent chromium. © 2016 Balaban Desalination Publications. All rights reserved.

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2016

N. Durgadevi, Sunitha, M., Dr. Asha Sathish, Guhan, S., and Dr. Ramachandran T., “Electro Oxidation of Methanol on Ni/Ni-Co Coated SS Mesh Electrode”, Indian Journal of Science and Technology, vol. 9, 2016.[Abstract]


In this work, the oxidation of methanol was carried out using Ni and Ni-Co alloy electrodeposited on stainless steel mesh substrate with a view to replace expensive and sensitive platinum and platinum alloy catalysts. The performance of electrode was assessed through cyclic voltammetry in alkaline media. The operating conditions of the electrode were optimized.

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2015

Nithya K., Dr. Asha Sathish, and T. Ramachandran, “Batch, kinetic and equilibrium studies of biosorption of chromium (VI) From aqueous phase using activated carbon derived from Lantana camara fruit”, Oriental Journal of Chemistry, vol. 31, no. 4, pp. 2319-2326, 2015.[Abstract]


Batch experiments have been conducted to determine the maximum adsorption capacity of activated carbon derived from Lantana camara fruit to remove hexavalent chromium from aqueous solution. The removal efficiency and uptake capacity of the biosorbent were determined by varying several batch level parameters. Highest removal efficiency of the biosorbent was found to be almost 99% under optimal conditions. Maximum monolayer adsorption capacity was determined to be 86 mg/g. The experimental data best fitted with Langmuir adsorption isotherm and pseudo second order model. These findings conclude that the selected biosorbent has more promising features in binding hexavalent chromium in aqueous media.

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2015

Nithya K., Dr. Asha Sathish, Dr. Gangadharan D., Vinaykumar, A., Tharakan, D. M., and Sruthi, B., “Batch, kinetic and equilibrium studies of hexavalent chromium from aqueous phase using Galaxaura Ornate Seaweed”, International Journal of ChemTech Research, vol. 8, no. 4, pp. 1947-1956, 2015.[Abstract]


Batch studies have been carried out to study the feasibility of adsorption of hexavalent chromium onto Galaxaura ornate seaweed. The equilibrium data and biosorption capacity of chromium was determined by varying the pH, dosage of adsorbent, contact time and initial metal ion concentration. The maximum adsorptive capacity was obtained at a pH of 2 at an equilibrium time of 120 minutes. Highest removal efficiency for raw biomass was found to be 71% for hexavalent chromium under optimal conditions. The biosorption isotherms were determined using Langmuir and Freundlich models. Based on the correlation coefficient value it was found that the data fits well both to Langmuir (R2=0.99) and Freundlich adsorption isotherm (R2=0.98) representing monolayer adsorption as well as adsorption on heterogeneous surfaces. The findings of the kinetic study infer that pseudo second order model show a better fit for a wider range of concentrations studied than the pseudo first order kinetics. The results indicate that the identified seaweed has the potential to adsorb chromium (VI) from the aqueous solution. © 2015 Sphinx Knowledge House. All rights reserved.

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2004

M. Jambulingam, Dr. Asha Sathish, Vasanthakumar, J., and Rakkiyappan, K., “Synthetic, Structural and Antimicrobial Studies of Some Substituted 2, 6-Diphenyl-1-Aza-7-Oxa-4-Spiro [2, 5] Octanes”, ASIAN JOURNAL OF CHEMISTRY, vol. 16, pp. 1261–1268, 2004.[Abstract]


<p>Different methyl substituted 2,6-diphenyl piperidones have been synthesized and subjected to the reaction with dimethyl sulphoxonium methyl ylide in the presence of potassium tertiary butoxide for the preparation of the corresponding spiro oxiranes. The structures of the products have been confirmed by various physical techniques.</p>

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2001

M. Jambulingam, Murugesan, M., Rajeswari, A., and Dr. Asha Sathish, “Kinetics and Mechanism of bromination of 1-Hetera-4-Cyclohexanones by N-Bromobarbitone”, ASIAN JOURNAL OF CHEMISTRY, vol. 13, pp. 395–402, 2001.[Abstract]


Kinetics of bromination of substituted 1-hetera-4-cyclohexanones by N-bromobarbitone [NBB] has been studied in aqueous acetic acid medium in the presence of HCIO4 and mercuric acetate. The reaction is acid and mercuric acetate catalysed exhibiting first order dependence each in [acid], [Hg(OAc)2] and [substrate] and zero order in [NBB]. This supports the acid catalysed enolisation of ketone as the rate determining step and reaction between enol and NBB as the first step. The decrease in dielectric constant of the medium enhances the rate of reaction. Arrhenius activation parameters have been computed.

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1999

M. S. Nair, Dr. Asha Sathish, and Pillai, M. S., “Studies on the stabilities of some mixed ligand complexes of nickel (II) involving dopamine/dopa and sulphur containing ligands”, Indian Journal of Chemistry, 1999.[Abstract]


Stability constants for the mixed ligand species of the types NiAB, NiABH and NiABH(2) (where A=dopamine and dopa; B=L-cysteine, D-penicilamine and L-cysteic acid) have been determined. In the NiAB, the mode of coordination of A and B is exactly similar to their binding in the respective binary complexes. In NiABH, the extra proton is attached to A. In NiABH(2) (where A=dopamine) one proton is attached to A and other resides with B, while in the NiABH(2) (where A=dopa) both the protons are with dopa. More »»

Publication Type: Conference Proceedings

Year of Publication Title

2019

Nithya K., Dr. Asha Sathish, A. Sanganathan, A. Pooja, and S. Balamurugan, “Rapid sorption of chromium ions using neem extract capped green synthesized magnetic nanoparticles”, Proceedings of the 4th International Conference on "Advances in Materials and Manufacturing Applications (IConAMMA 2019)” organized by Amrita Vishwa Vidyapeetham ,Bangalore, India, August 29-31. 2019.

2019

A. Namitha, T. Shyam Sundar, Dr. Asha Sathish, and Nithya K., “Process Optimization Studies for Algae Production and Biodiesel Extraction using Monoraphidium and Chlorella Sorokiniana”, First International Conference on Recent Trends in “Clean Technologies for Sustainable Environment”, SSN College of Engineering, Chennai, 25 – 27, September. 2019.

2019

Balamurugan, Adithyaa, V., Nithya K., and Dr. Asha Sathish, “Anthocyanin assisted mesoporous magnetite nanoparticles for sorption of chromium ions: modeling, characterization and application studies”, First International Conference on Recent Trends in “Clean Technologies for Sustainable Environment”, SSN College of Engineering, Chennai, 25 – 27, September. 2019.

2019

S. T Sundar, Dr. Asha Sathish, and Nithya, K., “Investigation of the blue-green algae based bio diesel using n-hexane and n-hexanol solvents: diesel engine emission parameter and characterization studies”, IOP Conference Series: Materials Science and Engineering, vol. 577. IOP Publishing, p. 012009, 2019.[Abstract]


The present study utilizes the species namely Spirulina platensis for extracting the biodiesel using different solvents using trans-esterification process. The gas chromatographic analysis was carried out to determine the chemical compounds present in the algal extract. The selected species were cultivated in the open pond and subsequently, algae oil has been extracted using n-hexane and n-hexanol solvent. Further, the comparison of n-hexane and n-hexanol based bio-diesel in the BD-20 blended form is done. Additionally, the extracted biodiesel is tested for emission parameters in the diesel engine. These results are compared with the emission parameters of commercial diesel which shows that n-hexane and n-hexanol based bio-fuel produces lesser emissions at different load conditions. Hence the selected Spirulina platensis species is found to be the promising alternate energy source for fuel extraction. Moreover, they are prone to exhibit lesser toxic emissions in the air environment than the commercial sources and found to be a sustainable source.

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2018

S. Sundar, Dr. Asha Sathish, and Nithya K., “Investigation of the blue-green algae based bio diesel using n-hexane and n-hexanol solvents: Diesel engine emission parameter and characterization studies”, International Conference on Advances in Materials and Manufacturing Applications (IConAMMA)” held at Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Bengaluru Campus, Karnataka, India. from 16 - 18th August. 2018.

2018

Nithya K. and Dr. Asha Sathish, “In-situ synthesis of iron oxide nanoparticles embedded in L. camara adsorbent for the sorption of nickel ions: adsorption, isotherm and kinetic studies”, TECHNOSCAPE18- An International Conference on Sustainable Water Resources: Innovations and Impacts, organized by the School of Chemical Engineering, Vellore Institute of Technology - VIT, in Vellore, Tamil Nadu, India, between September 6th and 8th. 2018.

Publication Type: Conference Paper

Year of Publication Title

2018

S. K. Das, Dr. Asha Sathish, and Stanley, J., “Production of Biofuel and Bioplastic from Chlorella Pyrenoidosa”, in Materials Today: Proceedings, 2018, vol. 5, pp. 16774-16781.[Abstract]


With the growing need for clean and alternate sources of energy, bio based fuels are increasingly being used as an energy substitute. Conventional sources used for biofuel production have limitations that can be overcome by the use of microalgae. For this study, biofuel and bioplastic were produced from Chlorella pyrenoidosa under optimised growth conditions. The mother culture was cultured separately in Fogg's medium and Fogg's broth under a constant light intensity of 80 Lux. Maximum growth was observed after 10 days. The strain showed an increase in growth rate under the presence of carbon dioxide. Lab scale flocculation and transesterification were carried out for the production of biodiesel. Tests were also conducted to ensure the quality of biodiesel. The leftover algal biomass was chemically treated to produce bioplastic. The biodegradability of the polymer is due to Poly Hydroxy Butyrate (PHB) present in the microalgae cell. The PHB content was analysed in UV photospectrometry at 230 nm. The result showed 27% of PHB content in the 14 days old algae culture. This ensures that the bioplastic produce from the microalgae is biodegradable in nature. The detoxification of Chromium and Nickel by the microalgae showed a reduction of 11.24% and 33.89% respectively. © 2017 Elsevier Ltd.

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Workshops/Seminars

  1. Fifth NIAS- DST workshop on "Nano Technology: ”Dimensions of Nano Science, Nano Technology & Society for Women Scientists & Technologists", National Institute of Advanced Studies, Bangalore, Dec 14 - 18, 2009
  2. Two Days workshop on "Nanotechnology : Innovations for Tomorrow’s World Environment", Sponsored by the Department of Science and Technology, GOI & Tamil Nadu State Council for Science and Technology, GOT., Organised by Periyar Maniammai University, August 6 - 7, 2008.
  3. Two days workshop on "Theory and hands on experience on 3 Dimensional Structure Determinations of Drugs using X-Ray Crystallography",Department of Chemistry, Gandhigram Rural University, Gandhigram, March 14 - 15, 2008.
  4. National workshop on Nano Science and Nano Technology, Amrita School of Engineering, Amritapuri Campus, May 14 - 18, 2007.
  5. Two day National Workshop on "An Introduction to Computational Chemistry and Molecular Modeeling", Department of Polymer and CEN, Amrita School of Engineering, Ettimadai, Coimbatore, July 28 - 29, 2006.

 

Invited Talks

  1. "Fuel Cells - Part of a Sustainable Energy Future", in the Fifth NIAS- DST Workshop on Nano Technology : 'Dimensions of Nanoscience, Nanotechnology & Society for Women Scientists & Technologists' and at the National Institute of Advanced Studies, Bangalore.

Projects Undertaken

  1. Undertaken an Internal Project on "Developing Nano Electrodes and Membrane for Direct Methanol and Ethanol Fuel Cells – Preliminary Studies", Completed within 18 Months, Amounted to Rs. 80, 000.
Faculty Research Interest: