Ag-AgIO<sub>3</sub>改性BiOI光催化剂湿法脱除气态单质汞

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Abstract

A series of Ag-AgIO₃/BiOI photocatalysts were successfully synthesized by a coprecipitation-photoreduction method and characterized by X-ray diffraction (XRD), N₂ adsorption-desorption, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS) and electron spin resonance (ESR). The effects of AgIO₃ content, fluorescent lamp (FSL) irradiation, solution temperature, pH value, SO₂ and NO on Hg⁰ removal were investigated in a photocatalytic reactor. In comparison to BiOI, Ag-AgIO₃ photocatalyst exhibited an enhanced fluorescent-light-driven photocatalytic activity for Hg⁰ removal. When the loading of AgIO₃ was 4wt.%, the removal efficiency of the Ag-AgIO₃/BiOI photocatalyst was as high as 98%. Compared with NO, the inhibitory effect of SO₂ on Hg⁰ removal efficiency became predominant. Due to the high dispersibility of Ag and AgIO₃ on the surface of BiOI, the visible light absorption performance of Ag-AgIO₃(4%)BiOI was significantly improved. The combination of fluorescent lamp irradiation and Ag-AgIO₃/BiOI photocatalyst could produce a large number of active species. The mechanism showed that in the efficient mercury removal system of the Ag-AgIO₃/BiOI photocatalyst, the superoxide radical (·O₂^-) was the most important active material, and the holes (h⁺) and hydroxyl radical (·OH) were the secondary factors.

Key words： Ag-AgIO₃/BiOI photocatalyst wet process Hg⁰ removal fluorescent lamp

Received: 25 March 2020

PACS:

X511

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	Articles by authors
	ZHOU Pu-yang
	ZHANG Xin-min
	ZHANG An-chao
	WANG Yi-chao
	SU Sheng
	LI Hai-xia
	XIANG Jun

Cite this article:

ZHOU Pu-yang,ZHANG Xin-min,ZHANG An-chao等. Wet process of gaseous Hg⁰ removal by Ag-AgIO₃ modified BiOI photocatalyst[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(11): 4703-4711.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I11/4703

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