Abstract
The main purpose of this research is to develop a low-cost and novel bioadsorbent hydrogel from rice husk (PRH) and modified rice husk (MRH) by carboxymethylation and grafting for the effective removal of chromium(VI) from aqueous solutions. The characterization and physico-chemical parameters of the bioadsorbents (PRH and MRH) was also performed. It was found that -CHO, >C=O, C-OH, Si-OH and -Si-H groups widely contributed towards the adsorption of chromium(VI) into the surface of bioadsorbents. The adsorption studies had been conducted using batch experiments. The adsorption equilibrium were analyzed and described by Freundlich, Langmuir and Dubinin-Radushkevish (D-R) isotherm models. It was observed that maximum adsorption of chromium(VI) was attained at pH 2. The optimized conditions regarding the removal of Cr(VI) using PRH (65%) and MRH (78%) as bioadsorbents were at 0.5 g/L of adsorbent dose, 120 min of contact time and pH 2. The results showed that rice husk residue based hydrogel has the potential to be used as a lowcost biosorbent for the removal of Cr(VI) from wastewater.
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