Fixation of Heavy Metals onto Lignocellulosic Sorbent Prepared from Paddy Straw
Abstract:The sorption behavior of biosorbent prepared from paddy straw with nine different heavy metals has been studied. The binding mechanisms involving adsorption and the cation-exchange process have also been investigated. Characterization of biosorbent through a scanning electron microscope revealed no major surface deformity resulting from the chemical treatment. X-ray photo electron spectroscopy was also used to determine the presence of exchangeable cations in the sorbent and the speciation of bound chromium, cadmium, and mercury. The maximum sorption capacity (millimoles/gram) obtained from the Langmuir model for Pb 2+, Cd 2+, Hg 2+, Co 2+, Ni 2+, Mn 2+, Zn 2+, and Cu 2+ were 0.286, 0.147, 0.226, 0.181, 0.196, 0.189, 0.219, and 0.248, respectively. Interpretation of
Document Type: Research Article
Publication date: 2008-11-01
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