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《Acta Scicentiarum Naturalum Universitis Pekinesis》 2003-06
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Adsorption of Cr(Ⅵ) to Prepared Chitosan Ramifications

LIU Xiaopeng ZHANG Jianbo WANG Weijing LI Feng (Department of Environmental Science, College of Environmental Scienc e, Peking University, Beijing,100871)  
Crosslinked chitosan, butylchitosan and O-carboxymethyl chi t osan were prepared by chemical method respectively, and some chitosan with low m olar mass was abtained by using γ-ray. Their characters of adsorption Cr(Ⅵ ) were observed. For chitosan, the optimum pH of adsorption Cr(Ⅵ)is 5 0 ~6.0; the ti me is 2?h; 3?mg Cr(Ⅵ) can be adsorbed by a gram chitosan and the adsorpti o n rate can be up to 90 %. All the adsorption abilities of crosslinked chitosan, butylchitosan and O-carboxymethyl chitosan are stronger than that of original c hitosan. For examples, crosslinked chitosan may reach the adsorption saturation in 1?h; the optimum pH of adsorption for butylchitosan is near 5.0, so it is mo r e available in acidic condition.After radiation degradation, chitosan has a ra nge of best adsorption in molar mass of (0.4~0.8) ×10 5?g/mol.
【CateGory Index】: O647.3
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