Using soybean hull residue after the soluble dietary fiber being removed during the soybean processing industry as crude material,a novel absorbent,modified soybean hulls,is prepared.Its adsorption behavior for Pb2＋ ...Using soybean hull residue after the soluble dietary fiber being removed during the soybean processing industry as crude material,a novel absorbent,modified soybean hulls,is prepared.Its adsorption behavior for Pb2＋ is studied.The adsorbent has a large and efficient adsorption capacity for Pb2＋,up to 20% of the mass of dry ad-sorbent.Its maximum adsorption capacity for Pb2＋ reaches 217 mg·g-1 at initial Pb2＋ concentration of 2000 mg·L-1,which is twice that of yeast absorbent and threefold greater than that of chitosan absorbent.The adsorption ability is sensitive to pH value in the solution and the optimal pH for adsorption of Pb2＋ is 7.0.In the presence of other metal ions （Ca2＋,Mg2＋ and Na＋） in the solution,their effect on the adsorption capacity for Pb2＋ is not obvious.After 5 cy-cles of adsorption,80% adsorption capacity of Pb2＋ is maintained.Compared with various available commercial resins,the modified soybean hulls are a plentiful,inexpensive and effective medium for the capture of dissolved Pb2＋ from waste streams.展开更多
基金Supported by the National Natural Science Foundation of China（20876008 21076009） the National Basic Research Program of China（2007CB714305）+1 种基金 the National High Technology Research and Development Program of China（2006AA020101） Chinese Universities Scientific Fund（ZZ1024）
文摘Using soybean hull residue after the soluble dietary fiber being removed during the soybean processing industry as crude material,a novel absorbent,modified soybean hulls,is prepared.Its adsorption behavior for Pb2＋ is studied.The adsorbent has a large and efficient adsorption capacity for Pb2＋,up to 20% of the mass of dry ad-sorbent.Its maximum adsorption capacity for Pb2＋ reaches 217 mg·g-1 at initial Pb2＋ concentration of 2000 mg·L-1,which is twice that of yeast absorbent and threefold greater than that of chitosan absorbent.The adsorption ability is sensitive to pH value in the solution and the optimal pH for adsorption of Pb2＋ is 7.0.In the presence of other metal ions （Ca2＋,Mg2＋ and Na＋） in the solution,their effect on the adsorption capacity for Pb2＋ is not obvious.After 5 cy-cles of adsorption,80% adsorption capacity of Pb2＋ is maintained.Compared with various available commercial resins,the modified soybean hulls are a plentiful,inexpensive and effective medium for the capture of dissolved Pb2＋ from waste streams.
