Photocatalytic oxidation removal of Hg-0 using ternary Ag/AgI-Ag2CO3 hybrids in wet scrubbing process under fluorescent light
Photocatalytic oxidation removal of Hg-0 using ternary Ag/AgI-Ag2CO3 hybrids in wet scrubbing process under fluorescent light
复制标题
荧光灯下湿法洗涤过程中使用三元Ag/AgI-Ag2CO3杂化物光催化氧化去除Hg0
DOI：
10.1016/j.apsusc.2016.09.116
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发表时间：
2017
影响因子：
6.7
通讯作者：
Xiang Jun
中科院分区：
文献类型：
--
作者：
Zhang Anchao;Zhang Lixiang;Chen Xiaozhuan;Zhu Qifeng;Liu Zhichao;Xiang Jun
采用简易共沉淀法合成了一系列三元Ag/AgI-Ag2CO3光催化剂，并在湿法洗涤反应器中考察了它们对Hg0的去除性能。用氮气吸附-脱附、X射线衍射仪、扫描电子显微镜、高分辨电子显微镜、X射线光电子能谱、差示扫描量热仪和电子自旋共振对杂化产物进行了表征。在荧光灯下考察了其光催化脱除Hg0的活性。结果表明，AgI含量、荧光灯照射、反应温度对Hg0的去除均有显著影响。与SO2相比，NO对Hg0的脱除效果显著。在Ag/AgI-Ag2CO3三元杂化材料中，Ag/AgI(0.1)-Ag2CO3对Hg0的去除效率最高，这归因于AgI和Ag2CO3之间的光生电子-空穴对的有效分离和金属银纳米颗粒(Ag0NPs)在可见光区的表面等离子体共振(SPR)效应。对活性自由基的捕获研究表明，超氧阴离子自由基(−)可能在荧光灯下去除Hg0中起关键作用。根据实验和表征结果，提出了Ag/AgI(0.1)-Ag2CO3杂化催化剂在荧光灯下强化光催化氧化去除Hg0的可能机理。
A series of ternary Ag/AgI-Ag2CO3photocatalysts synthesized using a facile coprecipitation method were employed to investigate their performances of Hg0removal in a wet scrubbing reactor. The hybrids were characterized by N2adsorption-desorption, XRD, SEM-EDS, HRTEM, XPS, DRS and ESR. The photocatalytic activities of Hg0removal were evaluated under fluorescent light. The results showed that AgI content, fluorescent light irradiation, reaction temperature all showed significant influences on Hg0removal. NO exhibited significant effect on Hg0removal in comparison to SO2. Among these ternary Ag/AgI-Ag2CO3hybrids, Ag/AgI(0.1)-Ag2CO3showed the highest Hg0removal efficiency, which could be ascribed to the effective separation of photogenerated electron-hole pairs between AgI and Ag2CO3and the surface plasmon resonance (SPR) effect in the visible region by metallic silver nanoparticles (Ag0NPs). The trapping studies of reactive radicals showed that the superoxide radicals (radical dotO2−) may play a key role in Hg0removal under fluorescent light. According to the experimental and characterization results, a possible photocatalytic oxidation mechanism for enhanced Hg0removal over Ag/AgI(0.1)-Ag2CO3hybrid under fluorescent light was proposed.