| 荧光灯辐照下Ag@AgCl-BiOCl光催化剂湿法脱汞研究 |
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| 引用本文： | 李成伟,路好,张安超,邢微波,胡松,向军.荧光灯辐照下Ag@AgCl-BiOCl光催化剂湿法脱汞研究[J].化工学报,2018,69(5):2217-2225. |
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| 作者姓名： | 李成伟 路好 张安超 邢微波 胡松 向军 |
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| 作者单位： | 1. 河南理工大学机械与动力工程学院, 河南 焦作 454000;
2. 华中科技大学煤燃烧国家重点实验室, 湖北 武汉 430074 |
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| 基金项目： | 国家自然科学基金项目（51676064，51306046，51576086）；河南省高等学校青年骨干教师项目（2016GGJS-038）。 |
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| 摘 要： | 采用共沉淀-光还原法制备了系列Ag@AgCl-BiOCl可见光催化剂，利用N2吸附-脱附、扫描电子显微镜（SEM）、X射线衍射（XRD）、紫外-可见漫反射光谱（DRS）、X射线光电子能谱（XPS）和电子自旋共振（ESR）等技术对光催化剂进行物化结构表征，在湿法脱汞装置上考察了荧光灯辐照下AgCl负载量、溶液pH、反应温度、SO2和NO对单质汞（Hg0）脱除性能的影响。结果表明，在荧光灯辐照下，当Ag/Bi物质的量比为0.2时，光催化剂的脱汞效率最高。随着pH和反应温度的升高，脱汞效率逐渐降低。与SO2相比，NO对脱汞效率的影响较大。在光催化氧化脱汞过程中，阴离子超氧自由基（·O2-）、空穴（h+）、羟基自由基（·OH）和氯自由基（·Cl）等均可能发挥作用，但·O2–作用较大。
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| 关 键 词： | 湿法 催化剂 Ag@AgCl-BiOCl 脱汞 烟道气 |
| 收稿时间： | 2017-09-11 |
| 修稿时间： | 2017-10-28 |
Wet process of elemental mercury removal using Ag@AgCl-BiOCl photocatalyst under fluorescent light irradiation |
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| LI Chengwei,LU Hao,ZHANG Anchao,XING Weibo,HU Song,XIANG Jun.Wet process of elemental mercury removal using Ag@AgCl-BiOCl photocatalyst under fluorescent light irradiation[J].Journal of Chemical Industry and Engineering(China),2018,69(5):2217-2225. |
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| Authors: | LI Chengwei LU Hao ZHANG Anchao XING Weibo HU Song XIANG Jun |
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| Affiliation: | 1. School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China;
2. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China |
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| Abstract: | A series of Ag@AgCl-BiOCl photocatalysts were synthesized by a coprecipitation-photoreduction method and characterized by N2 adsorption-desorption, scanning electron microscope (SEM), X-ray diffraction (XRD), UV-visible diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR) techniques to understand their physical-chemical structures. The effects of AgCl content, pH value, reaction temperature, SO2 and NO on the activities of elemental mercury (Hg0) removal were carried out in a wet Hg0 bubbling reactor under fluorescent light (FSL) irradiation. The results showed that a much higher Hg0 removal efficiency was obtained when the molar ratio of Ag to Bi was equal to 0.2 in the Ag@AgCl-BiOCl sample. With increasing pH value and reaction temperature, the Hg0 removal efficiency over Ag@AgCl(0.2)-BiOCl under FSL irradiation became gradually worse. Compared with SO2, NO showed a significant inhibitation on Hg0 removal. The mechanism analysis indicated that superoxide radicals (·O2-), holes (h+), hydroxyl radicals (·OH) and chlorine radicals (·Cl) could be reactive species in the photocatalytic process of Hg0 removal, and in particular the ·O2- played key role in Hg0 removal. |
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| Keywords: | wet process catalyst Ag@AgCl-BiOCl Hg0 removal flue gas |
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