标题：Sulfite activation by a low-leaching silica-supported copper catalyst for oxidation of As(III) in water at circumneutral pH

作者：Ding, W (Ding, Wei); Huang, XY (Huang, Xingyun); Zhang, WD (Zhang, Weidong); Wu, F (Wu, Feng); Li, JJ (Li, Jinjun)

来源出版物：CHEMICAL ENGINEERING JOURNAL卷：359页码：1518-1526 DOI：10.1016/j.cej.2018.11.020出版年：MAR 1 2019

摘要：Sulfite activation by metal is a promising SO4 center dot- -based advanced oxidation process (SR-AOPs) for pollutant removal. Homogeneous systems are limited by strict working pH and metallic oxide sludge generation. To overcome these drawbacks, a copper-silica composite modified by ammonia (CuNSi) was synthesized through a complexation-adsorption-combustion method and characterized by X-ray diffraction, X-ray photoelectron spectroscopies, transmission electronic microscopy etc. CuNSi demonstrates a stable and remarkable catalytic activation of sulfite for As(III) oxidation after five reuses in neutral wastewater. The negligible oxidation of As (III) under anoxic condition confirmed the importance of oxygen for the CuNSi/sulfite system. Bicarbonate significantly inhibited As(III) oxidation, whereas Cl-and NO3 slight restrained As(III) oxidation. The dosage of sulfite and As(III) affected initial rates of As(III) oxidation via the equation r(0)= k(r) x [Sulfite](2.11) x[As(III)](0.33) (k(r)=(3.68 +/- 0.46) x 10(3)M(-1).44 min(-1)). The apparent activation energy for As(III) oxidation was 60.14 +/- 5.17 kJ mol(-1). The SO4 center dot--was confirmed as the primary oxidative species, and the sulfite activation by CuNSi was through a Cu(II)-Cu(I)-Cu(II) cycle. Overall, this study suggests that the CuNSi/sulfite system can be a promising AOP for further application in wastewater treatment.

入藏号：WOS:000454137400146

文献类型：Article

语种：English

作者关键词：Sulfite; Copper; Oxysulfur radical; Arsenic; Advanced oxidation processes

通讯作者地址：Wu, F; Li, JJ (reprint author), Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Hubei, Peoples R China.

电子邮件地址：fengwu@whu.edu.cn; lijinjun@whu.edu.cn

地址：[Ding, Wei; Huang, Xingyun; Zhang, Weidong; Wu, Feng; Li, Jinjun] Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Hubei, Peoples R China.

影响因子：6.735