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Tiwari A.,Government Vyt Post Graduate Autonomous College | Sharma N.,Government Vyt Post Graduate Autonomous College
Research on Chemical Intermediates | Year: 2015

The efficiency of adsorption of cadmium ions from aqueous solutions by superparamagnetic nano iron oxide-loaded poly(acrylonitrile-co-acrylic acid) hydrogel has been investigated. The effect of equilibration time, amount of adsorbent, temperature, adsorbate concentration, and pH was studied by use of a batch system. The copolymer was magnetized in situ and the size, phase identification, morphology, and coating of magnetic nanoparticles were characterized by TEM, AFM, XRD, and FTIR analysis respectively. The sorption data were analyzed and fitted to linearized equations of the Langmuir, Freundlich, and Temkin isotherms. The kinetics of sorption were analyzed by use of pseudo-first-order and pseudo-second-order kinetic models. Kinetic data, rate constants, equilibrium sorption capacities, and related correlation coefficients for each kinetic model were calculated and are discussed. Thermodynamic data ΔG°, ΔH°, and ΔS° were evaluated. It was found the sorption process was feasible, spontaneous, and exothermic in nature. This hydrogel was an efficient adsorbent for removal of Cd2+ ions from water (>98 % removal) and could be regenerated efficiently (>99 %). © 2013 Springer Science+Business Media Dordrecht.


Kaur J.,Government VYT Post Graduate Autonomous College | Shrivastava R.,ICFAI University, Tripura | Jaykumar B.,Government VYT Post Graduate Autonomous College | Suryanarayana N.S.,Government VYT Post Graduate Autonomous College
Research on Chemical Intermediates | Year: 2014

This review includes research papers on different methods of preparation of Eu2+ and Dy3+-doped SrAl2O4 phosphors and papers reporting luminescence studies of the materials. The methods of preparation were compared and it was concluded that solid state reaction is the best method. Papers on characterization of these phosphors by X-ray diffraction and scanning electron microscopy are also discussed. The review ends with a few important conclusions. © 2013 Springer Science+Business Media Dordrecht.

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