Ag-PANI/BiOI光催化剂湿法脱除气态单质汞

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摘要采用原位光还原和简易化学吸附法制备出新型的三元Ag负载聚苯胺/碘氧化铋（PANI/BiOI）系列光催化剂，在模拟烟气条件下考察了光催化剂的脱汞性能，研究了Ag负载量、反应温度和烟气成分等对脱汞活性的影响，采用N₂吸附-脱附、XRD、TEM、XPS、DRS等技术对光催化剂的物理化学属性进行表征.结果表明：添加PANI后，光催化剂的Hg⁰去除性能大幅提升.负载4wt%的Ag后，Ag（4%）PANI/Bi OI具有约98%的脱汞性能.无机阴离子NO₃^-、Cl^-和SO₄^2-对光催化剂脱汞性能的抑制作用较小，但CO₃^2-对光催化剂的活性抑制作用较大，脱汞效率明显下降至82%.与PANI/BiOI相比，Ag（4%）PANI/Bi OI的比表面积和总孔容增大，表明Ag纳米颗粒高度分散在PANI/Bi OI的表面.Ag-PANI/BiOI显示出较强的光吸收能力.Ag纳米颗粒的添加能显著增强PANI/Bi OI表面e^--h⁺对的有效分离.光催化剂高效脱汞的原因在于PANI、Bi OI之间良好的带隙匹配和Ag纳米颗粒的表面等离子体共振（SPR）效应.

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	刘艳雯
	张倩倩
	张安超
	李成伟
	代冰洁
	梅艳阳
	张森
	苏胜
	向军

关键词 ：聚苯胺, 碘氧化铋, 光催化剂, 湿法, 单质汞脱除

Abstract：Series of novel ternary Ag supported PANI/BiOI hybrids synthesized by an in-situ photoreduction and facile chemisorptions method were utilized to explore their activities for the removal of toxic elemental mercury (Hg⁰) under simulated flue gas condition.The effects of Ag content,reaction temperature and flue gas composition on Hg⁰ removal activity were investigated.The physicochemical properties of the samples were characterized via N₂ adsorption desorption,XRD,TEM,XPS and DRS et al.The Hg⁰ removal activity of photocatalyst was greatly increased because of the addition of PANI.After the load of 4wt%Ag,the mercury removal efficiency of Ag(4%) PANI/BiOI can reach as high as 98%.The inhibition of Hg⁰ removal performance of photocatalyst was less by inorganic anions,such as NO₃^-,Cl^-and SO₄^2-,while CO₃^2-possessed a greater inhibition on the activity of photocatalyst,with the Hg⁰ removal efficiency decreasing to 82%.Compared with PANI/BiOI,the specific surface area and total pore volume of Ag(4%) PANI/BiOI increased,indicating that Ag nanoparticles were highly dispersed on the surface of PANI/BiOI.Ag-PANI/BiOI photocatalyst showed a strong light absorption capacity.Adding Ag nanoparticles resulted in an effective separation of e^--h⁺pair on PANI/BiOI surface.The reason for the higher efficiency Hg⁰ removal of hybrid photocatalyst could be ascribed to the good band gap matching between PANI and BiOI and the surface plasmon resonance (SPR) effect of Ag nanoparticles.

Key words： polyaniline bismuth oxyiodide photocatalyst wet progress Hg⁰ removal

收稿日期: 2021-08-01

PACS:

X511

基金资助:国家自然科学基金资助项目（51676064）；河南省高校科技创新人才资助项目（19HASTIT045）；河南省科技攻关资助项目（182102310810）

通讯作者: 张倩倩,讲师,zhangqianqian@hpu.edu.cn;张安超,教授,anchaozhang@126.com, E-mail: zhangqianqian@hpu.edu.cn;anchaozhang@126.com

作者简介: 刘艳雯(1998-),女,河南信阳人,河南理工大学硕士研究生,主要从事燃煤烟气多种污染物治理技术研究.发表论文2篇.

引用本文:

刘艳雯, 张倩倩, 张安超, 李成伟, 代冰洁, 梅艳阳, 张森, 苏胜, 向军. Ag-PANI/BiOI光催化剂湿法脱除气态单质汞[J]. 中国环境科学, 2022, 42(3): 1104-1112. LIU Yan-wen, ZHANG Qian-qian, ZHANG An-chao, LI Cheng-wei, DAI Bing-jie, MEI Yan-yang, ZHANG Sen, SU Sheng, XIANG Jun. Performance of Ag-PANI/BiOI photocatalyst for wet removal of gaseous elemental mercury. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(3): 1104-1112.

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