溶剂热合成可见光响应硫氮共掺杂TiO<sub>2</sub>光催化剂及其催化还原水中Cr(Ⅵ)

doi:10.11896/cldb.19080212

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Abstract An unique one-step solvothermal route, which utilized thioacetamide and nitric acid as the sulphur and nitrogen source, was proposed for the synthesis of S-N co-doped TiO₂ nanocrystals. The structures, composition, BET specific surface area and optical properties of SN-TiO₂ were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, N₂ adsorption-desorption isotherms and photocurrent measure. It's demonstrated that anatase phase SN-TiO₂ nanopowders with enhanced visible-light absorption, reduced bandgap and fast mobility of photogenerated carriers, and Ti⁴⁺ was substituted in the TiO₂ lattice by cationic S⁶⁺ and formed a new bond of Ti-O-S, and interstitially doped nitrogen atoms induced the formation of O-Ti-N bonds. The photocatalytic properties of A-SN-TiO₂ were tested for the reduction of Cr(Ⅵ) in water under both UV and visible light (λ>420 nm) irradiation in the absence of any sacrificial reagents, and compared with those of TiO₂, S-TiO₂, N-TiO₂ and B-SN-TiO₂ prepared with thiourea. The photocatalytic experiments indicated that A-SN-TiO₂ exhibit the highest photoreduction efficiency, and noticeably the photocatalytic reduction rate of Cr(Ⅵ) of A2-SN-TiO₂ was 100% under visible light irradiation after 60 min. Active species capture experiments and ESR showed that ·O₂^- is the active radicals in the photocatalysis. Photocatalytic mechanism of A-SN-TiO₂reduction of Cr(Ⅵ) was revealed based on the experimental results.

Key words： co-doped titanium dioxide visible light-dirven hexavalent chromium photocatalysis

Published: 17 November 2020

Fund:This work was financially supported by the Natural Science Foundation of Jiangsu Province (BK20171168), Major Program of Natural Science Foundation of the Jiangsu Higher Education Institutions of China (18KJA430015), Qing Lan Project of Jiangsu Province (2018).

About author:: Jing Li is an associate professor of School of Chemistry and Chemical Engineering at Xuzhou University of Technology, and also a doctoral candidate of School of Chemical Engineering and Technology at China University of Mining and Technology. Now she is engaged in the research of development of nanotechnology and photocatalytic treatment of Cr(Ⅵ) containing wastewater.

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	LI Jing
	LIU Tianbao
	ZHU Yaxin
	WANG Peng
	DU Xihua
	ZHANG Yongcai3

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LI Jing,LIU Tianbao,ZHU Yaxin, et al. Solvothermal Synthesis of Visible-light Driven S,N Co-doped Titanium Dioxide Photocatalyst and Photocatalytic Reduction of Aqueous Cr(Ⅵ)[J]. Materials Reports, 2020, 34(21): 21045-21051.

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http://www.mater-rep.com/EN/10.11896/cldb.19080212 OR http://www.mater-rep.com/EN/Y2020/V34/I21/21045

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