Cystine-modified biomass for Cd(II) and Pb(II) biosorption

被引：98

作者：

Yu, Junxia

Tong, Mi

Sun, Xiaomei

Li, Buhai ^{[1
]}

机构：

[1] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China

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

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2007年 / 143卷 / 1-2期

关键词：

baker's yeast; cystine; glutaraldehyde; crosslinking; adsorption;

D O I：

10.1016/j.jhazmat.2006.09.021

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The surface of dried biomass of baker's yeast was modified by crosslinking cystine with glutaraldehyde. X-ray photoelectron spectroscopy and microscope were used to characterize the modified biomass. The adsorption capacity of the modified biomass for Cd2+ and Pb2+ showed an increase compared with the pristine biomass due to the presence of cystine on the biomass surface. Experimental data showed that the adsorption of the two metal ions increased with time until equilibrium was achieved. The adsorption capacities for Cd2+ and Pb 21 were 11.63 and 45.87 mg g(-1), respectively, which were determined from the Langmuir isotherm. The loaded biosorbent was regenerated using HCl solution and could be used repeatedly at six times with little loss of uptake capacity. FTIR spectroscopy revealed that carboxyl, amide, and hydroxyl groups on the biomass surface were involved in the adsorption of Cd2+ and Pb2+. (C) 2006 Elsevier B.V. All rights reserved.

引用

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页码：277 / 284

页数：8

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