标题：Insights into the mechanism of heterogeneous activation of persulfate with a clay/iron-based catalyst under visible LED light irradiation作者：Gao, Yaowen; Zhang, Zhuoyue; Li, Simiao; Liu, Jin; Yao, Linyu; Li, Yixi;Zhang, Hui

来源出版物：APPLIED CATALYSIS B-ENVIRONMENTAL 卷：185 页：22-30 DOI：10.1016/j.apcatb.2015.12.002 出版年：MAY 15 2016

摘要：Activation of persulfate (PS) by ultraviolet (UV) light or metal catalysts has been extensively studied, however, little is known about the activation of persulfate by clay-based catalysts in the presence of visible light-emitting diode (LED) irradiation. Herein, a novel kaolinite-supported iron oxide (K-Fe)/PS/Vis process for the degradation of Rhodamine B (RhB) from aqueous solution is reported. It was found that although persulfate can degrade RhB via a non-radical reaction, the excited RhB molecule (RhB*) and the Fe(II) species formed on the catalyst surface can effectively activate persulfate to generate radicals which degrade RhB under visible light irradiation. On the basis of quenching experiments and electron paramagnetic resonance (EPR) studies, it is suggested that the free radicals produced from persulfate coupled with the surface-adsorbed radicals formed on the catalyst were responsible for the degradation of the dye via RhB*. Moreover, the K-Fe catalyst showed excellent reusability and stability with a low level of iron leaching. The findings of this work demonstrate a new pathway for activation of persulfate, which could effectively degrade organic pollutants and also provide some new insights into persulfate remediation of contaminated water.

入藏号：WOS:000369452000003

文献类型：Article

语种：English

作者关键词：Kaolinite, Visible LED light, Persulfate, Photocatalytic degradation, Near-neutral pH

扩展关键词：ADVANCED OXIDATION PROCESSES; PHOTO-FENTON CATALYST; ZERO-VALENT IRON; ORGANIC CONTAMINANTS; WASTE-WATER; PHOTOCATALYTIC DEGRADATION; RHODAMINE-B; ORANGE G; PEROXYMONOSULFATE; REMOVAL

通讯作者地址：Zhang, H, Wuhan Univ, Dept Environm Engn, Wuhan 430079, Peoples R China.

电子邮件地址：eeng@whu.edu.cn

地址：

[Gao, Yaowen; Zhang, Zhuoyue; Li, Simiao; Liu, Jin; Yao, Linyu; Li, Yixi; Zhang, Hui] Wuhan Univ, Dept Environm Engn, Wuhan 430079, Peoples R China.

[Gao, Yaowen; Zhang, Hui] Wuhan Univ, Shenzhen Res Inst, Shenzhen 518057, Peoples R China.

研究方向：Chemistry; Engineering

ISSN：0926-3373

eISSN: 1873-3883

影响因子（2014）：7.435