可见光下Bi2WO6纳米片高效光降解四环素的机理研究

doi:10.15541/jim20190389

无机材料学报 ›› 2020, Vol. 35 ›› Issue (3): 324-328.DOI: 10.15541/jim20190389 CSTR: 32189.14.10.15541/jim20190389

所属专题： 2020年环境材料论文精选(三)有机小分子去除

可见光下Bi₂WO₆纳米片高效光降解四环素的机理研究

魏鑫¹,卢占会¹(),王路平¹,方明²()

^1. 华北电力大学数理学院, 北京 102206
^2. 华北电力大学环境科学与工程学院资源环境系统优化教育部重点实验室, 北京 102206

收稿日期:2019-07-26 修回日期:2019-10-24 出版日期:2020-03-20 网络出版日期:2019-10-25
作者简介:魏鑫(1996-), 女, 硕士研究生. E-mail:weixin@ncepu.edu.cn
基金资助:
国家自然科学基金(U1607102);国家自然科学基金(21377132);国家自然科学基金(91326202);中央高校基本科研业务费专项资金(2019MS040)

Mechanism Study of Tetracycline High Efficient Photodegradation by Bi₂WO₆ Nanosheets under Visible Light Irradiation

WEI Xin¹,LU Zhanhui¹(),WANG Luping¹,FANG Ming²()

^1. School of Mathematics and Physics, North China Electric Power University, Beijing 102206, China
^2. MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China

Received:2019-07-26 Revised:2019-10-24 Published:2020-03-20 Online:2019-10-25
About author:WEI Xin(1996-), female, Master candidate. E-mail: weixin@ncepu.edu.cn
Supported by:
National Natural Science Foundation of China(U1607102);National Natural Science Foundation of China(21377132);National Natural Science Foundation of China(91326202);Fundamental Research Fund for the Central Universities(2019MS040)

摘要/Abstract

摘要：

作为一种窄带隙半导体材料, Bi₂WO₆在光催化降解有机污染物上具有很大的应用潜力。研究采用水热法合成了Bi₂WO₆纳米片, 并在可见光照射下研究其对四环素的光催化降解。利用XRD、FESEM、TEM、吸收光谱等对材料进行结构和形貌的表征。实验发现, 在pH=8的四环素溶液中加入50 mg Bi₂WO₆纳米片, 可见光照射130 min 后, 85%的四环素（50 mL, 50 mg/L）被降解。实验还研究了Bi₂WO₆纳米片光电化学性质, 通过加入不同的自由基捕获剂研究了光催化降解四环素的反应机理。结果表明, Bi₂WO₆纳米片具有较高的电子密度和电子空穴分离效率是其具有良好光催化性能的原因。

关键词: Bi₂WO₆纳米片, 四环素, 光催化, 可见光

Abstract:

As a narrow band gap semiconductor, Bi₂WO₆ has great application potential in photo-degradation of organic pollutants, such as tetracycline. In present work, Bi₂WO₆ nanosheets were successfully synthesized by a hydrothermal method and the photo-degradation of tetracycline under visible light irradiation were investigated. XRD, FESEM, TEM and absorption spectra were used to characterize the structure and morphology of the material. It was found that when adding 50 mg Bi₂WO₆ nanosheets into 50 mL of tetracycline solution at pH=8, 85% tetracycline (50 mL, 50 mg/L) was photodegraded within 130 min. The photoelectron-chemical experiments and free radical capture experiments were performed to explore the photo-degradation mechanism. The results show that good photocatalytic performance of Bi₂WO₆ nanosheets are ascribed to the high electron density and photoelectron-hole separation efficiency.

Key words: Bi₂WO₆ nanosheets, tetracycline, photocatalytic, visible light

中图分类号:

TQ174

魏鑫, 卢占会, 王路平, 方明. 可见光下Bi₂WO₆纳米片高效光降解四环素的机理研究[J]. 无机材料学报, 2020, 35(3): 324-328.

WEI Xin, LU Zhanhui, WANG Luping, FANG Ming. Mechanism Study of Tetracycline High Efficient Photodegradation by Bi₂WO₆ Nanosheets under Visible Light Irradiation[J]. Journal of Inorganic Materials, 2020, 35(3): 324-328.

图/表 8

图1 加入不同NaOH含量制备的样品的XRD谱图

Fig. 1 XRD patterns of the sample prepared with different NaOH additions

图2 Bi2WO6纳米片的FESEM照片(a), TEM照片(b), HRTEM照片(c)和能谱图(d)

Fig. 2 FESEM image (a), TEM image (b), HRTEM image (c), and Energy Dispersion Spectrum (d) of Bi2WO6 nanosheets

图3 Bi2WO6纳米片样品的紫外-可见吸收谱(a)和带隙图(b)

Fig. 3 UV-Vis absorption spectrum (a) and band gap plot of Bi2WO6 nanosheets (b)

图4 添加不同NaOH制备的Bi2WO6对四环素的光降解曲线(a)及其lnC0/C曲线(b)

Fig. 4 Photodegradation of tetracycline by products prepared with different NaOH additions (a), and corresponding curves of lnC0/C vs. time

图5 添加1 g NaOH制备的Bi2WO6纳米片在不同pH溶液中对四环素的光降解曲线(a)及其lnC0/C曲线(b)

Fig. 5 (a) Photodegradation of tetracycline in the solution with different pH and corresponding curves of lnC0/C vs. time (b) of Bi2WO6 nanosheets prepared with addition of 1 g NaOH

图6 自由基捕获实验

Fig. 6 Radical capturing experiments Triangle curve is the tetracycline photocatalytic experiments with adding Bi2WO6 nanosheets as photocatalysts, and circle curve is experiment without photocatalysts

图7 Bi2WO6纳米片在可见光照射下四个周期光电流信号的稳定性实验(a)和Bi2WO6纳米片的奈奎斯特频谱(b)

Fig. 7 (a) Signal stability of photocurrent of Bi2WO6 nanosheets under visible light irradiation for four cycles and (b) Nyquist spectra of Bi2WO6 nanosheets

图8 Bi2WO6纳米片的循环伏安图

Fig. 8 CV curve of the Bi2WO6 nanosheets

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可见光下Bi₂WO₆纳米片高效光降解四环素的机理研究

Mechanism Study of Tetracycline High Efficient Photodegradation by Bi₂WO₆ Nanosheets under Visible Light Irradiation

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