Biosorption of Pb2+ with Modified Soybean Hulls as Absorbent

Abstract

Abstract: 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 cycles 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.

Key words: biosorption, Pb²⁺, soybean hulls, desorption, wastewater

摘要： 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 cycles 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.

关键词: biosorption, Pb²⁺, soybean hulls, desorption, wastewater

LI Jia, CHEN Enzan, SU Haijia, TAN Tianwei. Biosorption of Pb²⁺ with Modified Soybean Hulls as Absorbent[J]. , 2011, 19(2): 334-339.

李嘉, 陈恩赞, 苏海佳, 谭天伟. Biosorption of Pb²⁺ with Modified Soybean Hulls as Absorbent[J]. , 2011, 19(2): 334-339.

References

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Biosorption of Pb²⁺ with Modified Soybean Hulls as Absorbent

Biosorption of Pb²⁺ with Modified Soybean Hulls as Absorbent

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