Ag-PANI/BiOI光催化剂湿法脱除气态单质汞

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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

Received: 01 August 2021

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X511

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	Articles by authors
	LIU Yan-wen
	ZHANG Qian-qian
	ZHANG An-chao
	LI Cheng-wei
	DAI Bing-jie
	MEI Yan-yang
	ZHANG Sen
	SU Sheng
	XIANG Jun

Cite this article:

LIU Yan-wen,ZHANG Qian-qian,ZHANG An-chao等. Performance of Ag-PANI/BiOI photocatalyst for wet removal of gaseous elemental mercury[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(3): 1104-1112.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I3/1104

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