原位合成Bi3O4Br/Bi12O17Br2光催化剂及其对磺胺甲噁唑降解性能

摘要/Abstract

摘要： Bi_xO_yBr_z光催化剂在有机药物废水处理领域有着非常广阔的潜在应用价值,但因光生电子和空穴的快速复合而表现出较低的光催化效率,进而限制了其应用范围。通过简易的水解-焙烧法原位制得一种新型的Bi₃O₄Br/Bi₁₂O₁₇Br₂复合光催化剂,并以磺胺甲噁唑(SMX)为模拟药物污染物进行了光催化性能测试,对所制催化剂进行了X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、紫外可见漫反射光谱(UV-Vis DRS)、电化学阻抗(EIS)、光致发光光谱(PL)等表征。结果表明所制备的Bi₃O₄Br/Bi₁₂O₁₇Br₂复合光催化剂具有较强的光生载流子分离率、较低的界面电荷转移电阻,进而展示出优异的光催化降解SMX性能,在模拟太阳光下照射30 min,SMX降解率达到87%,相较于纯的Bi₃O₄Br和Bi₁₂O₁₇Br₂催化剂,降解率分别提升了30%和24%。最后基于自由基捕获实验和催化剂能带结构分析了所制催化剂的降解机理。

关键词: Bi_xO_yBr_z光催化剂, 复合光催化剂, 原位合成, 降解, 光催化性能, 水解-焙烧法, 磺胺甲噁唑

Abstract: Bi_xO_yBr_z photocatalysts exhibit great potential in the application of organic pharmaceutical wastewater treatment and air purification. However, the catalysis activity and application of photocatalyst is greatly limited by its intrinsic high recombination rate of photo-generated charge carriers. In this work, a novel Bi₃O₄Br/Bi₁₂O₁₇Br₂composite photocatalyst was prepared via a facile in-situ hydrolysis-calcination route and its photocatalytic performance was evaluated by the sulfamethoxazole (SMX) degradation efficiency via simulated solar light irradiation. The structure and property were analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), nitrogen adsorption and desorption, UV-Vis diffuse reflectance spectra (UV-Vis DRS), electrochemical impedance spectroscopy (EIS), Steady photoluminescence and Mott-Schottky curves. Results reveal that Bi₃O₄Br/Bi₁₂O₁₇Br₂ composite photocatalyst display the optimum photocatalytic performance, and its removal efficiency of SMX reaches 87% under 30 min simulated solar light irradiation, which is improved approximately 30% and 24% than that of pure Bi₃O₄Br and pure Bi₁₂O₁₇Br₂, respectively. Based on characterization analysis, the superior performance is attributed to higher electron-hole separation rate and lower charge transfer resistance. Finally, the underlying photocatalytic mechanism was elucidated based on the band structure and radical scavenging experiments. This findings provide novel ideas and methods of the construction of the composite photocatalysts system for strong organics pharmaceutical wastewater treatment.

Key words: Bi_xO_yBr_z photocatalyst, composite photocatalyst, in-situ synthesis, degradation, photocatalytic performance, hydrolysis-calcination route, sulfamethoxazole

中图分类号:

李瑞, 张潇, 张璐璐, 谢芳霞, 张小超, 王雅文, 樊彩梅. 原位合成Bi₃O₄Br/Bi₁₂O₁₇Br₂光催化剂及其对磺胺甲噁唑降解性能[J]. 人工晶体学报, 2021, 50(9): 1735-1744.

LI Rui, ZHANG Xiao, ZHANG Lulu, XIE Fangxia, ZHANG Xiaochao, WANG Yawen, FAN Caimei. In-Situ Preparation of Bi₃O₄Br/Bi₁₂O₁₇Br₂ Photocatalyst and Their Degradation Performances of Sulfamethoxazole[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(9): 1735-1744.

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原位合成Bi₃O₄Br/Bi₁₂O₁₇Br₂光催化剂及其对磺胺甲噁唑降解性能

In-Situ Preparation of Bi₃O₄Br/Bi₁₂O₁₇Br₂ Photocatalyst and Their Degradation Performances of Sulfamethoxazole

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