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Hajeeth T.,Sathyabama University | Vijayalakshmi K.,DKM College for Women | Gomathi T.,DKM College for Women | Sudha P.N.,DKM College for Women
International Journal of Biological Macromolecules | Year: 2013

The extraction of cellulose from sisal fiber was done initially using the steam explosion method. The batch adsorption studies were conducted using the cellulose extracted from the sisal fiber and cellulose-g-acrylic acid as an adsorbent for the removal of Cu(II) and Ni(II) metal ions from aqueous solution. The effect of sorbent amount, agitation period and pH of solution that influence sorption capacity were investigated. From the observed results, it was evident that the adsorption of metal ions increases with the increase in contact time and adsorbent dosage. The optimum pH was found to be 5.0 for the removal of copper(II) and nickel(II) for both the extracted cellulose and cellulose-g-acrylic acid copolymer. The adsorption data were modeled using Langmuir and Freundlich isotherms. The experimental results of the Langmuir, Freundlich isotherms revealed that the adsorption of Cu(II) and nickel(II) ion onto cellulose extracted from the sisal fiber and cellulose-g-acrylic acid copolymer was found to fit well with Freundlich isotherm. The kinetics studies show that the adsorption follows the pseudo-second-order kinetics. From the above results, it was concluded that the cellulose-g-acrylic acid copolymer was found to be an efficient adsorbent. © 2013 Elsevier B.V.


Hajeeth T.,Sathyabama University | Sudha P.N.,DKM College for Women | Vijayalakshmi K.,DKM College for Women | Gomathi T.,DKM College for Women
International Journal of Biological Macromolecules | Year: 2014

Graft copolymerization of acrylonitrile on to cellulosic material derived from sisal fiber can be initiated effectively with ceric ammonium nitrate. The grafting conditions were optimized by changing the concentration of initiator and monomer. The change in crystallinity of the grafted polymeric samples was concluded from the XRD patterns. The prepared cellulose grafted acrylonitrile copolymer was used as an adsorbent to remove Cr (VI) ions from aqueous solutions. The efficiency of the adsorbent was identified from the variation in the percentage of adsorption with contact time, adsorbent dose and pH. From the observed results it was evident that the adsorption of metal ions increases with the increase in contact time and metal ion concentration. An optimum pH was found to be 5.0 for the removal of Cr (VI) from the aqueous solution. The results of the Langmuir, Freundlich, and pseudo first- and second-order studies revealed that the adsorption was found to fit well with Freundlich isotherm and follows pseudo second-order kinetics. From the above results, it was concluded that the cellulose-g-acrylonitrile copolymer was found to be an efficient adsorbent for the removal of Cr (VI) from aqueous waste generated from industries. © 2014 Elsevier B.V.


Shankar P.,Sathyabama University | Gomathi T.,DKM College for Women | Vijayalakshmi K.,DKM College for Women | Sudha P.N.,DKM College for Women
International Journal of Biological Macromolecules | Year: 2014

The graft copolymerization of acrylonitrile onto cross linked chitosan was carried out using ceric ammonium nitrate as an initiator. The prepared cross linked chitosan- g-acrylonitrile copolymer was characterized using FT-IR and XRD studies. The adsorption behavior of chromium(VI), copper(II) and nickel(II) ions from aqueous solution onto cross linked chitosan graft acrylonitrile copolymer was investigated through batch method. The efficiency of the adsorbent was identified from the varying the contact time, adsorbent dose and pH. The results evident that the adsorption of metal ions increases with the increase of shaking time and metal ion concentration. An optimum pH was found to be 5.0 for both Cr(VI) and Cu(II), whereas the optimum pH is 5.5 for the adsorption of Ni(II) onto cross linked chitosan- g-acrylonitrile copolymer. The Langmuir and Freundlich adsorption models were applied to describe the isotherms and isotherm constants. Adsorption isothermal data could be well interpreted by the Freundlich model. The kinetic experimental data properly correlated with the second-order kinetic model. From the above results it was concluded that the cross linked chitosan graft acrylonitrile copolymer was found to be the efficient adsorbent for removing the heavy metals under optimum conditions. © 2014 Elsevier B.V.


Sangeetha V.,Sathyabama University | Sudha P.N.,Dkm College For Women
International Journal of ChemTech Research | Year: 2014

Chitosan is the most important derivative obtained from Chitin, a natural polysaccharide constitute of crustaceous shells. In this research work the polymer blends were prepared by mixing of nano chitosan with poly vinyl pyrrolidone (PVP) and silk fibroin in the ratio 1:1:1 with and without the inclusion of cross linking agent glutaraldehyde. The characterizations of prepared polymeric blends were carried out by advanced analytical tools FT-IR, TGA, DSC and XRD methods. From the FTIR study it can be revealed that there is intermolecular hydrogen bonding interaction. The XRD studies show the films of this study are of amorphous in character. By using DSC experiments the Glass Transition temperature and crystallization of the polymer blends were investigated.Further analysis of cytoxicity assay will provide information on the suitability of the material for tissue engineering applications. Keywords: Nanochitosan, PVP, Silk fibroin, characterization.


Kalachar H.C.B.,Kuvempu University | Basavanna S.,Indian Institute of Science | Viswanatha R.,Kuvempu University | Arthoba Naik Y.,Kuvempu University | And 2 more authors.
Electroanalysis | Year: 2011

In the present work a gold modified pencil graphite electrode (GPGE) was used for the determination of L-dopa present in the aqueous extracts of Mucuna pruriens seeds (MPS), Mucuna pruriens leaves (MPL) and Commercial Siddha Product (CSP). The GPGE shows excellent electrocatalytic activity towards the oxidation of both L-dopa and ascorbic acid (AA), with the separation of peak potential of 98mV. The differential pulse voltammetric (DPV) results indicated that the detection limit for L-dopa was 1.54μM (S/N=3). This method can be successfully applied for the determination of L-dopa in real samples. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Bhargavi V.L.N.,Sri Venkateswara College of Engineering | Sudha P.N.,DKM College for Women
International Journal of ChemTech Research | Year: 2015

The focus of the present research work is on the monitoring of heavy metal pollution in water and soils of Ranipet, Tamil nadu India. The physico-chemical characteristics and heavy metals like Chromium and Cadmium were analysed for two polluted water and soil samples collected from Bharathi nagar (I) and Tandalam (II) villages of Ranipet surroundings. The soil sample of Tandalam was chosen for the remediation studies, due to its high levels of pollution. Electrokinetic remediation of Tandalam soil was carried at 50 V. The electrokinetic cell was sectioned into four compartments and analysed for the concentrations of Chromium and Cadmium. After electrokinetic remediation, the heavy metal contaminants get concentrated in different sections according to their charges and the soil in the four compartments of the electrokinetic cell was subjected to phytoremediation with Indian mustard (Brassica juncea) seeds. The efficiency of Brassica juncea was proved in remediating the heavy metals Chromium and Cadmium from the polluted soils. © 2015, Sphinx Knowledge House. All rights reserved.


Jayakumar S.,Bharathiar University | Gomathi T.,DKM College for Women | Sudha P.N.,DKM College for Women
International Journal of Biological Macromolecules | Year: 2013

The removal of Pb (II) ions from aqueous solution by crosslinked (glutaraldehyde-chitosan/Nylon6/Polyurethane foam) and non crosslinked (chitosan/Nylon6/Polyurethane foam) blends has been investigated. Chitosan solution was blended with Nylon6 and Polyurethane foam in the ratio of 2:1:1 with and without crosslinking agent (glutaraldehyde), in order to obtain sorbents that are insoluble in aqueous acidic and basic solution. Batch adsorption studies were performed as a function of pH, contact time and adsorbent dose. The optimum pH required for maximum adsorption of lead was found to be 5. The equilibrium adsorption data has been tested for the Langmuir, Freundlich and Temkin isotherms. The data were suitable to Freundlich isotherm model for both the blends. The kinetic parameters of the adsorption process were estimated using the pseudo-first and pseudo-second order models. These data indicated that the adsorption process followed the pseudo-first-order kinetics. © 2013 Elsevier B.V..


Joseph J.J.,Vellore Institute of Technology | Sangeetha D.,Vellore Institute of Technology | Gomathi T.,Dkm College For Women
International Journal of Biological Macromolecules | Year: 2016

The nano-polymeric pharmaceutical excipient such as chitosan nanoparticles (CS-NPs) were synthesized for formulating the anticancer drug Sunitinib (STB). The formulation was done through the simple ionic cross linking method. The prepared formulation was characterized by DLS, SEM, FT-IR and XRD. The DLS study reveals that the Sunitinib loaded chitosan nanoparticles (SNB-CS-NPs) were in the size range of <200. nm. Encapsulation of Sunitinib and validation for the formulation was done using UV spectrophotometry. In vitro drug release and its cytotoxic studies were performed for STB-CS-NPs. This study implies the novel drug delivery system for Sunitinib for the effective sustained delivery. © 2015 Elsevier B.V.


Saravanan D.,Tamil University | Hemalatha R.,Tamil University | Sudha P.N.,DKM College for Women
Der Pharma Chemica | Year: 2011

Mixing of two or more polymers to produce blends is a well established strategy for achieving specific combination of physical properties. Polymer blend films of chitin and bentonite were prepared from homogeneous solutions in trichloroacetic acid at various ratios of chitin and bentonite. The cross linking agent glutaraldehyde was incorporated into the polymer blends to improve the properties such as surface hardness, stiffness, resistance to temperature and solvent attack. FTIR study revealed that there is intermolecular molecular hydrogen bonding interaction between the two polymer components. XRD studies shows that the films to exhibit an amorphous character. Glass transition temperature and the crystallization of the polymer blends were investigated on the basis of studies differential scanning calorimetry (DSC). By TGA and DTG experiments, enhancement in the thermal stability of polymer blend in presence of cross linking agent (glutaraldehyde) was found out. Adsorption of Cu (II) and Cr (VI) on chitin was studied by the Longmuir and Freundlich method. The influence of dosage of adsorbent, contact time & pH were experimentally verified. The results revealed that the adsorption of Cu (II) and Cr (VI) on chitin is spontaneous, endothermic and favorable. This blended polymer was used as an adsorbent in dye effluent treatment.


Sivakami M.S.,Mills College | Gomathi T.,DKM College for Women | Venkatesan J.,Pukyong National University | Jeong H.-S.,Pukyong National University | And 3 more authors.
International Journal of Biological Macromolecules | Year: 2013

Chitosan nanorod with minimum particle size of <100. nm was prepared by crosslinking low molecular weight chitosan with polyanion sodium tripolyphosphate and physicochemically characterized (FT-IR, XRD, SEM, AFM, TGA and DSC) for waste water treatment. Its sorption capacity and sorption isotherms for chromium (Cr) were studied. The effect of initial concentration of Cr ions, sorbent amount, agitation period and pH of solution that influence sorption capacity were also investigated. It was found that nanochitosan in the solid state was rod shaped which could sorb Cr (VI) to Cr (III) ions effectively. Based on the Langmuir, the Freundlich and the Temkin sorption isotherms, the sorption capacity of chitosan nanoparticles is very high and the adsorbent favors multilayer adsorption. The kinetics studies show that the adsorption follows the pseudo-second-order kinetics, which infers the transformation of Cr (VI) to Cr (III). From the results it was concluded that nanochitosan is an excellent material as a biosorbent for Cr removal from water. © 2013 Elsevier B.V.

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