Biosorption of aquatic cadmium(II) by unmodified rice straw

被引:177
作者
Ding, Yang [1 ]
Jing, Debing [1 ]
Gong, Huili [2 ]
Zhou, Lianbi [3 ]
Yang, Xiaosong [3 ]
机构
[1] Capital Normal Univ, Coll Life Sci, Beijing 100048, Peoples R China
[2] Capital Normal Univ, Coll Resources Environm & Tourism, Beijing 100048, Peoples R China
[3] Beijing Gen Res Inst Min & Met, Inst Environm Engn, Beijing 100070, Peoples R China
基金
中国国家自然科学基金;
关键词
Rice straw; Cadmium biosorption; Pseudo-second order kinetic model; Isothermal model; Biosorption mechanism; HEAVY-METAL IONS; AQUEOUS-SOLUTIONS; AGRICULTURAL WASTE; COPPER(II) IONS; REMOVAL; ADSORPTION; EQUILIBRIUM; KINETICS; SORPTION; LEAD(II);
D O I
10.1016/j.biortech.2012.01.110
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Cadmium is the most common toxic metal threatening safe rice supply. Rice straw has the potential to remove Cd from large-scale effluent contaminated by heavy metals since it exhibited a short biosorption equilibrium time of 5 min, high biosorption capacity (13.9 mg g(-1)) and high removal efficiency at a pH range of 2.0-6.0. The main Cd biosorption mechanism was Cd2+ ion exchange with K+, Na+, Mg2+ and Ca2+, together with chelation with functional groups such as C=C, C-O, O-H and carboxylic acids. When 0.5% (w/v) rice straw was exposed to 50 mg mL(-1) CdSO4 solution with shaking at 150 r min(-1) for 3 h, about 80% of the aquatic Cd was absorbed and the Cd content in rice straw reached 8-10 mg g(-1), suggesting that the metal-enriched rice straw could become high quality bio-ore by virtue of the industrial mining grade of its metal content and easy metal recovery. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:20 / 25
页数:6
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