Adsorptive removal of Cd(II) from aqueous solution using natural and modified rice husk

被引：95

作者：

Ye, Hengpeng ^{[1
]}

Zhu, Qing

Du, Dongyun

机构：

[1] S Cent Univ Nationalties, Inst Environm Engn & Sci, Sch Chem & Mat Sci,State Ethn Affairs Commiss, Key Lab Catalysis & Mat Sci, Wuhan 430074, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2010年 / 101卷 / 14期

关键词：

Rice husk; Cd(II) adsorption; Adsorption capacity; Wastewater; WASTE-WATER; METAL-IONS; CADMIUM; PHOSPHATE; KINETICS; CU2+; NI2+; ASH; RED;

D O I：

10.1016/j.biortech.2010.02.027

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

In this study, the natural and modified rice husk were tested to remove Cd(II) ions from water. The modified rice husk was prepared by being treated with alkali. The results showed the Cd(II) adsorption capacity was 73.96, 125.94 mg/g, respectively, for the natural and modified rice husk. The modified rice husk had faster kinetics and higher adsorption capacities than the natural rice husk, which can be attributed to the surface structural changes of the material. Equilibrium adsorption data are more consistent with the Langmuir isotherm equation than with the Freundlich equation. The Cd(II) adsorption on the two adsorbents tends to increase with the increase of pH. The optimum pH for Cd(II) adsorption is 6.5. Both pseudo-first-order and pseudo-second-order equations were able to describe properly the kinetics of Cd(II) adsorption. The desorbability of Cd(II) is about 95.8-99.1% by 0.1 M HCl solution. (C) 2010 Elsevier Ltd. All rights reserved.

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页码：5175 / 5179

页数：5

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