Catalytic reduction of 4-nitrophenol by magnetically recoverable Au nanocatalyst

被引:489
作者
Chang, Yang-Chuang [1 ]
Chen, Dong-Hwang [1 ]
机构
[1] Natl Cheng Kung Univ, Dept Chem Engn, Tainan 701, Taiwan
关键词
Nitrophenol; Catalytic reduction; Gold; Magnetic recoverable catalyst; AROMATIC NITRO-COMPOUNDS; GOLD NANOPARTICLES; P-NITROPHENOL; AQUEOUS-SOLUTION; METAL-IONS; SILVER; ADSORPTION; NANOCOMPOSITES; AMINOPHENOL; EQUILIBRIUM;
D O I
10.1016/j.jhazmat.2008.10.034
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A novel magnetically recoverable Au nanocatalyst was fabricated by the simple adsorption-reduction of Au(III) ions on chitosan-coated iron oxide magnetic nanocarrier. Au nanoparticles with a mean diameter of 3.14 non were well loaded on the surface of magnetic nanocarrier because chitosan layer provided an effective driving force in the formation and stabilization of Au nanoparticles. The resultant magnetically recoverable Au nanocatalyst exhibited excellent catalytic activity to the reduction of 4-nitrophenol (4-NP) with sodium borohydride. The rate constants evaluated in terms of pseudo-first-order kinetic model increased with increasing the amount of Au nanocatalyst, decreasing the initial 4-NP concentration, and increasing the temperature. Also, the kinetic data suggested that this catalytic reaction was diffusion controlled owing to the presence of chitosan layer. In addition, catalyst reuse showed no trace of deactivation or poisoning during the catalytic and separation processes, revealing the stable nature and good catalytic ability of this nanocatalyst. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:664 / 669
页数:6
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