Sn空位增强Li<sub>2</sub>SnO<sub>3</sub>光催化降解四环素的研究

doi:10.11896/cldb.21030159

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Abstract Vacancy defect plays an important role in the research of photocatalysis. In this work, vacancy samples Li₂Sn_1-xO₃(x=0, 0.1, 0.2, 0.3, 0.4) were prepared by solid state method and characterized by powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM). Tetracycline(TC) was applied as a target pollutant to evaluate the photocatalytic performance. The results show that Li₂Sn_1-xO₃(x=0.1, 0.2, 0.3, 0.4) exhibit an excellent photocatalytic degradation, compared with parent Li₂SnO₃, and with the increase content of Sn vacancies, the photocatalytic efficiency firstly increased and then decreased. Electronic structure calculations and diffuse reflectance optical spectroscopy suggest that the enhanced photocatalytic performance might originate from lowered the valence band maximum caused by Sn vacancy, which enhances the photocatalytic oxidative capability. Among them, the defect sample Li₂Sn_0.7O₃ embraces the best photocatalytic performance. The photodegradation efficiency could reach approximately 71% within 50 min under UV irradiation. Besides, the photocatalytic behavior was successfully described by a pseudo first-order kinetics model, and the obtained rate constant was 0.026 83 min^-1. Further, free radical capture experiments indicated that photo-excited holes are the dominate radicals in the degradation of TC solution. Finally, the efficiency of photocatalytic performance slightly decreased after 2 cycling runs.

Key words： Sn vacancy Li₂SnO₃ photocatalysis tetracycline

Published: Online: 2022-05-24

CLC number:

O611

Fund:Chongqing Elite Innovation and Entrepreneurship Demonstration Team (CQYC201903178), the Basic and Frontier Research Project of Chongqing Science and Technology Commission (cstc2021jcyj-msxmX1181), the Scientific and Technological Research Program of Chongqing Municipal Education Commission (KJQN202001613), the Cultivation for National Science Foundation of Chongqing University of Education (18GZKP01), the Research Projects for College Students of Chongqing University of Education (KY20200138, KY20210133), and the National Project of College Students' Innovation and Entrepreneurship Training Program (202114388002).

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	Articles by authors
	LI Yuanyuan
	PU Hongzheng
	ZENG Hanlu
	JIANG Mingzhu
	REN Yanrong
	GONG Xiangnan

Cite this article:

LI Yuanyuan,PU Hongzheng,ZENG Hanlu, et al. Sn Vacancy of Li₂SnO₃ Enhancing the Photocatalytic Degradation of Tetracycline[J]. Materials Reports, 2022, 36(10): 21030159-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21030159 OR http://www.mater-rep.com/EN/Y2022/V36/I10/21030159

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