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Pakistan Journal of Biological Sciences

Year: 2005 | Volume: 8 | Issue: 5 | Page No.: 721-725
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Research Article

Application of Rice Husk and its Ash in Cadmium Removal from Aqueous Solution

A.H. Mahvi, N. Alavi and A. Maleki

ABSTRACT

The adsorption behavior of rice husk and its ash for cadmium ions from aqueous solutions has been investigated as a function of appropriate equilibrium time, amount of adsorbent, concentration of adsorbate, pH and particle size using a batch system. Studies showed that pH of aqueous solutions affected cadmium removal as a result of removal efficiency increased with increasing solution pH. The maximum adsorption was about 97.2 and 99.2% for rice husk and rice husk ash, respectively, at pH 6, contact time 180 min and initial concentration of 20 mg L -1. Desorption of cadmium was 9% at pH 6. The cadmium sorption obeyed both the Langmuir and Fraundlich isotherms. The studies showed rice husk ash was more favorable than rice husk in removing cadmium and thus was a better adsorbent.
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