Sn空位增强Li2SnO3光催化降解四环素的研究

doi:10.11896/cldb.21030159

材料导报

2022, Vol. 36

Issue (10): 21030159-6 https://doi.org/10.11896/cldb.21030159

无机非金属及其复合材料

Sn空位增强Li₂SnO₃光催化降解四环素的研究

李园园^1,*, 蒲红争¹, 曾寒露¹, 蒋明珠¹, 任彦荣¹, 公祥南^2,*

1 重庆第二师范学院生物与化学工程学院, 重庆 400067
2 重庆大学分析测试中心, 重庆 401331

Sn Vacancy of Li₂SnO₃ Enhancing the Photocatalytic Degradation of Tetracycline

LI Yuanyuan^1,*, PU Hongzheng¹, ZENG Hanlu¹, JIANG Mingzhu¹, REN Yanrong¹, GONG Xiangnan^2,*

1 College of Biological and Chemical Engineering, Chongqing University of Education, Chongqing 400067, China
2 Analytical and Testing Center of Chongqing University, Chongqing University, Chongqing 401331, China

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摘要缺陷在光催化的研究中发挥着重要作用。本工作通过固相烧结法制备了Sn空位光催化样品Li₂Sn_1-xO₃(x=0,0.1,0.2,0.3,0.4),并采用粉末X射线多晶衍射技术(PXRD)及扫描电镜(SEM)对其物相结构和表面形貌进行了表征。以盐酸四环素(TC)作为目标污染物探究了其光催化性能。研究结果表明,相比于母体Li₂SnO₃,Li₂Sn_1-xO₃(x=0.1,0.2,0.3,0.4)具有优异的光催化降解性能,且随着Sn空位浓度的增大,Li₂Sn_1-xO₃降解TC的能力呈现先增大后减小的趋势。这可能是因为Sn空位降低了Li₂SnO₃的价带顶,从而增强了其氧化光催化降解能力。其中,缺陷样品Li₂Sn_0.7O₃具有最优的光催化效果。在紫外灯辐射50 min内,其降解率可达71%。光催化动力学分析表明其光催化降解满足一级动力学模型,速率常数为0.026 83 min^-1。自由基捕获实验表明,空穴(h⁺)是TC降解过程中的主要活性自由基。此外,在两次循环试验中,Li₂Sn_0.7O₃的催化活性略有降低。

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关键词: Sn空位 Li₂SnO₃ 光催化四环素

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

发布日期: 2022-05-24

ZTFLH:

O611

基金资助: 重庆英才创新创业示范团队(CQYC201903178);重庆市自然科学基金面上项目(cstc2021jcyj-msxmX1181);重庆市教育委员会科学技术研究项目(KJQN202001613);重庆第二师范学院国家自科基金校级培育项目(18GZKP01); 重庆第二师范学院大学生科研项目(KY20200138;KY20210133);大学生创新创业训练计划国家级项目(202114388002)

通讯作者: liyy@cque.edu.cn;xiangnan.gong@cqu.edu.cn

作者简介: 李园园,重庆第二师范学院副教授。2016年12月获重庆大学博士学位。主要从事催化剂的设计、合成及应用,计算化学等方向的研究。在国际顶级期刊Journal of the American Chemical Society, Chemical Society Reviews, Inorganic Chemistry Frontiers, Inorganic Chemistry, Chinese Chemical Letters等发表学术论文30余篇,申请发明专利13项,其中5项发明专利已授权,1项实用新型专利已授权。
公祥南,重庆大学分析测试中心光谱分析室主任。2011年6月获温州大学硕士学位。长期开展低维结构功能材料的拉曼光谱学研究,包括原位变温拉曼结合热学输运性质的研究以及角分辨极化拉曼定向晶体的研究。在国际高水平期刊Appl. Surf. Sci., Sci. China Mater., Vib. Spectrosc., Spectrochim. Acta Part A等光谱类专业期刊发表学术论文30余篇;申请专利2项(授权1项);荣获2020年中国分析测试协会科学技术奖一等奖(3/10)。

引用本文:

李园园, 蒲红争, 曾寒露, 蒋明珠, 任彦荣, 公祥南. Sn空位增强Li₂SnO₃光催化降解四环素的研究[J]. 材料导报, 2022, 36(10): 21030159-6.
LI Yuanyuan, PU Hongzheng, ZENG Hanlu, JIANG Mingzhu, REN Yanrong, GONG Xiangnan. Sn Vacancy of Li₂SnO₃ Enhancing the Photocatalytic Degradation of Tetracycline. Materials Reports, 2022, 36(10): 21030159-6.

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http://www.mater-rep.com/CN/10.11896/cldb.21030159 或 http://www.mater-rep.com/CN/Y2022/V36/I10/21030159

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