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Jinia A.J.,Kishinchand Chellaram College | Pandey J.R.,Kishinchand Chellaram College
Rasayan Journal of Chemistry | Year: 2015

The growth of doped KDP crystals was initiated at room temperature using gel technique. Hydrosilica gel medium was prepared with the help of Sodium Metasilicate (SMS) solution mixed with weak acid i.e. Acetic Acid. The Oxalic Acid used as dopant, caused slight shift in the frequency of functional group present in pure KDP, which was studied by Fourier Transform Infrared Spectroscopy (FTIR). The lattice parameters of the grown doped crystals were determined by powder X-ray diffraction pattern (XRD). Further the Oxalic Acid doped KDP crystals were subjected to Thermogravimetric Analysis. The melting point and decomposition temperature was determined from this TGA/DTA characterization. © 2015 RASAYAN. All rights reserved. Source


Barot N.S.,Kishinchand Chellaram College | Bagla H.K.,Kishinchand Chellaram College
Radiochimica Acta | Year: 2012

The present investigation entails the application of dry cow dung powder (DCP) as an indigenous, inexpensive and eco-friendly material for the removal of Cr(VI) from aqueous medium. Batch biosorption experiments were conducted employing 51Cr(VI) as a tracer and the effect of various process parameters such as optimum pH, temperature, amount of resin, time of equilibration, agitation speed, concentration of metal ions and interfering effect of different salts etc. were studied. The kinetic studies were carried out employing various models but the best fitting was given by Lagergren Pseudo-second order model with high correlation coefficient R2 value of 0.997 and adsorption capacity of 10.20 mg/g. The thermodynamic parameters for biosorption were evaluated as ΔG° = -2.837 kJ/mol, ΔH°= -4.757 kJ/mol and ΔS° = 16.64 J/molK, which indicated spontaneous and exothermic process with high affinity of DCP for Cr(VI). Many naturally available materials are used for the biosorption of heavy metal pollutants, where most of them are physically or chemically modified. In this research work, DCP has been utilized without any pre or post chemical treatment. Thus it manifests the principle of green chemistry and proves to be an eco-friendly resin. © by Oldenbourg Wissenschaftsverlag, München. Source


Barot N.S.,Kishinchand Chellaram College | Bagla H.K.,Kishinchand Chellaram College
Journal of Radioanalytical and Nuclear Chemistry | Year: 2012

The present investigation entails the biosorption studies of radiotoxic Strontium ( 90Sr), from aqueous medium employing dry cow dung powder (DCP) as an indigenous, inexpensive and, eco-friendly material without any pre or post treatments. The Batch experiments were conducted employing 90Sr(II) as a tracer and the effect of various process parameters such as optimum pH, temperature, amount of resin, time of equilibration, agitation speed and concentration of metal ions have been studied. The kinetic studies were carried out employing various models but the best fitting model was Lagergren pseudo-second order model with high correlation coefficient R 2 value of 0.999 and cation exchange capacity of DCP was found to be 9.00 mg/g. The thermodynamic parameters for biosorption were evaluated as ΔG° = -5.560 kJ/mol, ΔH° = -6.396 kJ/mol and ΔS° = 22.889 J/mol K, which indicated spontaneous and exothermic process with high affinity of Sr(II) for DCP. © 2011 Akadémiai Kiadó, Budapest, Hungary. Source


Barot N.S.,Kishinchand Chellaram College | Khilnani R.P.,Kishinchand Chellaram College | Bagla H.K.,Kishinchand Chellaram College
Journal of Radioanalytical and Nuclear Chemistry | Year: 2014

To evaluate the bioremediation efficiency of natural humic substances, over it’s synthetic counterpart, a comparative batch equilibration biosorption assay have been carried out employing radiotracers on different humi-resins. The biosorptive profile of various humiresins as devised hereby, attempts to justify an innovative and concrete role of dry cow dung powder (DCP), in ‘as it is form’, for the bioremediation of metal pollutants such as Cr(III), Cr(VI), Cd(II), Hg(II) and Sr(II). Our comparative results conclude that, with all other optimized parameters as obtained 100 mg of DCP removes Cr(III) at pH 6, Cd(II) at pH 3 and Hg(II) at pH 3 to 70–75 and 80–85 % respectively. Also, at pH 1 with 250 mg of DCP 70–75 % Cr(VI) is removed. Similarly, 90–95 % of Sr(II) is sequestered at pH 6, with 350 mg of DCP. The study on thermodynamic, kinetic and isotherm modelling of DCP indicates feasible, eco-friendly and efficient process. © 2014, Akadémiai Kiadó, Budapest, Hungary. Source

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