Enhanced and selective adsorption of Pb2+ and Cu2+ by EDTAD-modified biomass of baker's yeast

被引：107

作者：

Yu, Junxia ^{[1
,2
]}

Tong, Mi ^{[2
]}

Sun, Xiaomei ^{[2
]}

Li, Buhai ^{[1
,2
]}

机构：

[1] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430074, Peoples R China

[2] S Cent Univ Nationalities, Key Lab Anal Chem State Ethn Affairs Commiss, Coll Chem & Mat Sci, Wuhan 430074, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2008年 / 99卷 / 07期

关键词：

biosorption; ethylenediaminetetraacetic dianhydride; modified; baker's yeast;

D O I：

10.1016/j.biortech.2007.04.038

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Enhanced and selective removal of Pb2+ and Cu2+ in the presence of high concentration of K+, Na+, Ca2+ and Mg2+ were achieved by adsorption on biomass of baker's yeast modified with ethylenediaminetetraacetic dianhydride (EDTAD). The modified biomass was found to have high adsorption capacities and fast rates for Pb'+ and Cu, and it also displayed consistently high levels of metal uptake over the pH range from 2.7 to 6.0. From Langmuir isotherm, the adsorption capacities for Pb2+ and Cu2+ were found to be 192.3 and 65.0 mg g(-1) respectively, which are about 10 and 14 times higher than that of the unmodified biomass. Competitive biosorption experiments showed that the co-ions of K+, Na+, Ca2+ and Mg2+ had little effects on the uptake of Pb2+ and Cu2+ even at the concentration of 1.0 mol L-1. The adsorbed Pb2+ and Cu2+ on the modified biomass could be effectively desorbed in an EDTA solution, and the regenerated biomass could be reused repeatedly with little loss of the adsorption capacity. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：2588 / 2593

页数：6

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