Adsorption studies and the removal of dissolved metals using pyrolusite as adsorbent |
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| Authors: | Mohammad Ajmal Rifaqat A. K. Rao Bilquees Ara Siddiqui |
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| Affiliation: | (1) Environmental Research Laboratory, Department of Applied Chemistry, Faculty of Engineering and Technology, Aligarh Muslim University, 202002 Aligarh, India |
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| Abstract: | The adsorption of metals from aqueous solutions of Pb2+, Zn2+ and Mg2+ on naturally occurring pyrolusite have been studied. The chemical stability of the pyrolusite has been determined in NaOH, H2SO4, HNO3, HCl, NaCl and NK4Cl solutions of various concentrations. Adsorption of the metal ions followed the order Pb2+>Zn2+>Cd2+.The maximum adsorption of Pb2+ (100%) occurred at pH 7. the relation between the amount of Pb2+ adsorbed per unit weight of pyrolusite and the concentration of Pb2+ at equilibrium follows the Freundlich adsorption isotherm.The efficiency of pyrolusite has been demonstrated by removing lead from synthetic waste water. 100% and 96% removal of lead have been achieved from synthetic waste water containing 5 mg l–1 and 120 mg l–1 of Pb2+ respectively at pH 7. The results of these studies suggest that pyrolusite might provide an economical method for the removal of lead from industrial waste water. |
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