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Characterization of WBAP and their utilization for the removal of heavy metal ions from wastewater

Congress: 2008
Author(s):
1. Rajesh Singh Research Scholar, Department of Chemistry, Veer Narmad South Gujarat University, Udhna Magdalla Road, Surat - 395007. INDIA. e-mail: rs.chemistry@gmail.com Mobile No. +919427139533 2. Dr. Bhavna A. Shah Professor Department of Chemistry Veer Narmad South Gujarat University, Surat. Email: bhavna606@yahoo.co.in ajaybhavnain@yahoo.co.in

Keyword(s): sorption, heavy metals, watewater, isotherms, kinetics
AbstractWastewater discharged from electroplating industry pose a serious hazard due to their heavy metal load. The objective of this work was to evaluate the removal of metal ions from aqueous solution by using weathered basalt andesite products (WBAP). The sorption behavior of Cu (II) onto WBAP was studied as a function of shaking time, sorbent dose, hydronium ion concentration, initial metal ion concentration, and temperature. Thermodynamic parameters (∆H0, ∆S0, and ∆G0) for the sorption process were evaluated. The sorption of metal ions increased with increase in temperature indicating endothermic nature of the sorption process. Freundlich, Langmuir, Temkin, and Dubinin-Kaganer-Radushkevich isotherms were applied to the sorption pattern on the WBAP. The sorption dynamics of the process was evaluated by applying Lagergren, Bangham, and Weber & Morris equations. The process follows Pseudo second order rate and surface diffusion is identified as the predominating mechanism. The sorption process was shown to be reversible by the recovery of sorbed metal ions upon extraction with 0.5 M HNO3. The sorbent before and after sorption, was characterized by FTIR, PXRD, and TGA methods. The change in surface morphology and crystallanity of the mineral after sorption was analyzed by scanning electron microscopy and transmission electron microscopy. An increase in crystallanity after sorption of metal ions was observed. An industrial effluent was successfully treated with the same sorbent. The study demonstrates the high effectiveness of WBAP in removing metal ions from polluted waters.
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