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Uma Batra and Gurjit Singh

PEC University of Technology, India

Title: Hydroxyapatite based nanostructures for effi cient treatment of lead containing waste water

Biography

Biography: Uma Batra and Gurjit Singh

Abstract

The present work deals with the development of hydroxyapatite (n-HA) and hydroxyapatite-chitosan composite (n-HACs) nanostructres for removal of lead ions from aqueous lead containing solutions. The synthesis of n-HA was carried out using solgel route while the n-HACs was prepared by a co-precipitation method. Th e nanostructures were characterised using transmission electron microscopy, X-ray diff raction, fourier transform infrared spectrophotometry and thermogravimetric analysis to reveal the morphology, crystal structure, functionality and stability respectively. In order to evaluate the lead removal characteristics of n-HA and n-HACs, adsorption tests were conducted and the results showed better performance of n-HACs than n-HA. The equilibrium Pb+2 ions concentration was identifi ed by atomic absorption spectroscopy. Th e infl uence of initial Pb+2 ion concetration, and sorbent dosage on sorption capacity was studied. The kinetics of the sorption process was also investigated. Two models of adsorption isotherms (Freundlich and langmuir) were employed to corelate the results and to understand the  adsorption mechanism. Adsorption kinetics and isotherm tests revealed that Pb+2 adsorption to the n-HACs follows pseudo-seond order kinetic and Langmuir-type adsorption respectively.