Effect of redox state of Ag on indoor formaldehyde degradation over Ag/TiO2 catalyst at room temperature

被引：63

作者：

Fang, Ruimei ^{[1
]}

He, Miao ^{[1
]}

Huang, Haibao ^{[1
,2
]}

Feng, Qiuyu ^{[1
]}

Ji, Jian ^{[1
]}

Zhan, Yujie ^{[1
]}

Leung, Dennis Y. C. ^{[2
,3
]}

Zhao, Wei ^{[3
]}

机构：

[1] Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou, Guangdong, Peoples R China

[2] Guangdong Hong Kong Joint Res Ctr Air Pollut Cont, Guangzhou, Guangdong, Peoples R China

[3] Univ Hong Kong, Dept Mech Engn, Hong Kong, Hong Kong, Peoples R China

来源：

CHEMOSPHERE | 2018年 / 213卷

基金：

中国国家自然科学基金;

关键词：

Formaldehyde; Redox state; Ag/TiO2; Catalytic oxidation; Indoor air; GASEOUS FORMALDEHYDE; COMPLETE OXIDATION; ACTIVATED CARBON; TOLUENE; TIO2; NANOPARTICLES; SUPPORTS; REMOVAL; BENZENE; SITES;

D O I：

10.1016/j.chemosphere.2018.09.019

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Ag/TiO2 catalysts were prepared via in-situ synthesis and impregnation methods. The effect of redox state of Ag species on catalytic activity of Ag/TiO2 catalysts was studied. The Ag-i-300 catalyst with partially oxidized state of Ag species shows superior catalytic activity, keeping HCHO removal efficiency at an extraordinary level of 100% during the 200 min's reaction. The Ag/TiO2 catalysts were characterized by XPS, UV Vis, BET, XRD, TEM, and in-situ DRIFTS technologies. XPS and TEM results exhibit that the partially oxidized state of Ag delta+ (0 < delta < 1) and high dispersion of Ag species are beneficial for the oxidation of HCHO over Ag/TiO2 catalysts. According to the above results, a reaction pathway for HCHO oxidation over Ag-i-300 catalyst was also proposed. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：235 / 243

页数：9

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