Adsorption Study Of Cr (Vi) From Aqueous Solution Using Fe (Iii)-Modified Diatomite

Abstract

This study investigated the effectiveness of Fe (III)-modified diatomite in removing hexavalent chromium from aqueous solution as a low cost adsorbent under various conditions. Batch mode experiments were conducted to study the effects of pH, contact time, adsorbent dose, and initial concentration of adsorbate on the adsorption of hexavalent chromium. Adsorption equilibrium was achieved after a contact time of 150 min. Hexavalent chromium adsorption was significantly dependent on solution pH, and the optimum adsorption was observed at pH 2. Equilibrium isotherm data were analyzed by the Langmuir and Freundlich models. Results indicated that adsorption process obeys Freundlich isotherm model better than Langmuir. An estimated maximum adsorption capacity of 1.96 mg/g was observed using Fe (III)-diatomite adsorbent at optimal conditions of the batch experiment.