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Ramya R.,Tamil University | Sudha P.N.,Dkm College For Women Autonomous
Polymer Composites | Year: 2013

The binary chitosan/silk fibroin composite synthesized by reinforcement of silk fibroin fiber into the homogenous solution of chitosan in formic acid was used to investigate the adsorption of two metals of Cu(II) and Cd(II) ions in an aqueous solution. The binary composite was characterized by Fourier transform infrared and scanning electron microscopy. The optimum conditions for adsorption by using a batch method were evaluated by changing various parameters such as contact time, adsorbent dose, and pH of the solution. The experimental isotherm data were analyzed using the Freundlich and Langmuir equations, indicated to be well fitted to the Langmuir isotherm equation under the concentration range studied, by comparing the correlation co-efficient. Adsorption kinetics data were tested using pseudo-first-order and pseudo-second-order models. Kinetics studies showed that the adsorption followed a pseudo-second-order reaction. Due to good performance and low cost, this binary chitosan/silk fibroin composite can be used as an adsorbent for removal of Cu(II) and Cd(II) from aqueous solutions. © 2013 Society of Plastics Engineers. Source


Dhanam N.,Dkm College For Women Autonomous | Thamaraichelvan A.,Thiagarajar College of Engineering
International Journal of ChemTech Research | Year: 2015

A new ionic salt of N-(2-pyridyl)piperazinium tetrachlorocuprate(II) (PPCC) has been synthesized and characterized by UV-Visible, FT-IR, TGA and NMR analyses. The structure was confirmed by single crystal XRD. It is monoclinic, with the space group of P21/c with the values of a = 9.194(5) Å; b = 16.152(5) Å; c = 9.471(5) Å and α = 90°, β =99.254(5) °, 90° = 90.000(5) ° and Z = 4. The anion shows a chloride-bridged binuclear structure with Cu….Cu distance of 3.935 Å; the two Cu(II) ions have distorted trigonal bipyramidal geometry. Extensive hydrogen bonding between the cation and the tetrachlorocuprate(II) unit found to stabilize the structure. DFT calculations and the anti microbial activities of the titled compound were also carried out. © 2015, Sphinx Knowledge House. All rights reserved. Source


Vinayagam A.,Sathyabama University | Sudha P.N.,Dkm College For Women Autonomous
Asian Journal of Chemistry | Year: 2013

Present work was undertaken to study antioxidant free radical scavenging activity of leaves and flowers extracts of Leucas indica. Crude methanolic extracts was screened for in vitro antioxidant free radical scavenging activity by diphenyl picryl hydrazyl, nitric oxide radical scavenging and superoxide radical scavenging assay methods. Results showed that IC50 value of methanol extracts of leaves in diphenyl picryl hydrazyl, nitric oxide scavenging and superoxide radical scavenging assays are 241.11, 282.97 and 250.45 μg/mL. Similarly IC50 value of methanol extracts of flowers in diphenyl picryl hydrazyl, nitric oxide scavenging and superoxide radical scavenging assays are 0.19, 2.05 and 2.15 μg/mL, respectively. Phytochemical screening revealed that flavonoids, alkaloids and phenolic compound are present in methanol extracts of leaves and flowers and may be responsible for the antioxidant activity. The result showed that Leucas indica flowers are more potential free radical scavenging activity than leaves. Source


Sangeetha V.,Sathyabama University | Sudha P.N.,Dkm College For Women Autonomous | Gomathi T.,Dkm College For Women Autonomous
Materials Today: Proceedings | Year: 2016

Chitosan is a valuable component for many polymer blends and their composites. Chitosan has various functional properties. Hence it has been used for the improvement of properties of other polymeric materials through blending. The advantages of using nanoparticles are controlling the particle size and surface area related properties. Nanochitosan prepared from chitosan, possesses excellent physicochemical, environmentally benign properties and bioactivities. In this study binary and ternary polymer blends of Nanochitosan (NC), Polyvinylpyrollidone (PVP) and Silk Fibroin (SF) were prepared by solution casting method with glutaraldehyde as the cross linker. Glutaraldehyde was incorporated into polymer blends to improve the properties such as Mechanical strength, Tensile strength and Surface hardness. The prepared binary and ternary blends were subjected to various spectral studies and the results are discussed. © 2016 Elsevier Ltd. Source


Dhanam N.,Dkm College For Women Autonomous | Thamaraichelvan A.,Thiagarajar College of Engineering
International Journal of ChemTech Research | Year: 2015

The synthesis and crystal structure of the title compound, [N-(4 chlorobenzyl) piperazineH2]CuCl4.Cl2 of molecular formula C22H34N4Cl2CuCl6 has been prepared and studied by X-ray diffraction method. The crystals are orthorhombic, Abm2, with a = 7.1344(2), b = 44.191(2), c = 9.1061(4), z = 4 and a final R value of 0.0289. Flattening of the tetrahedral CuCl42- anion occurs to such an extent that the structure is closer to the rarely encountered slightly distorted square with an average trans angle of 166.305°. The structure consists of a CuCl42- anion, two lattice Cl- ions and two (N-4-ClBzPipzH2)2+cation which are hydrogen bonded to anions through N-H…..Cl weak bonds thus stabilizing the planar like geometry of the anion. The electronic spectrum reveals the d-d and charge transfer bands at 450 nm and 320 nm respectively. The protonation of N-(4-chlorobenzyl)piperazine moiety and the occurrence of hydrogen bonding interactions are deduced from vibrational spectra. The thermal analysis is in accordance with the structural features. Computational studies established the presence of H-bonding and other interactions among the various moieties. Further, anti-microbial activities of the compound have also been established. © 2015, Sphinx Knowledge House. All rights reserved. Source

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