Wet process of elemental mercury removal using Ag@AgCl-BiOCl photocatalyst under fluorescent light irradiation

LI Chengwei; LU Hao; ZHANG Anchao; XING Weibo; HU Song; XIANG Jun

doi:10.11949/j.issn.0438-1157.20171235

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Wet process of elemental mercury removal using Ag@AgCl-BiOCl photocatalyst under fluorescent light irradiation

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- Wet process of elemental mercury removal using Ag@AgCl-BiOCl photocatalyst under fluorescent light irradiation
- CIESC Journal Issue 5, Pages: 2217-2225(2018)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20171235
  CLC： 511
- Online First：05 May 2018，
  
  Published：05 May 2018
- 稿件说明：
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LI Chengwei, LU Hao, ZHANG Anchao, et al. Wet process of elemental mercury removal using Ag@AgCl-BiOCl photocatalyst under fluorescent light irradiation[J]. CIESC Journal, 2018, (5): 2217-2225.
DOI：

LI Chengwei, LU Hao, ZHANG Anchao, et al. Wet process of elemental mercury removal using Ag@AgCl-BiOCl photocatalyst under fluorescent light irradiation[J]. CIESC Journal, 2018, (5): 2217-2225. DOI： 10.11949/j.issn.0438-1157.20171235.

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。

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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