水热合成Bi2WO6/ZnO异质结型光催化剂及其光催化性能

doi:10.3724/SP.J.1077.2011.01157

无机材料学报 ›› 2011, Vol. 26 ›› Issue (11): 1157-1163.DOI: 10.3724/SP.J.1077.2011.01157

水热合成Bi₂WO₆/ZnO异质结型光催化剂及其光催化性能

余长林¹, 杨凯¹, YU Jimmy C², 操芳芳¹, 李鑫¹, 周晓春¹

(1. 江西理工大学冶金与化学工程学院, 赣州 341000; 2. 香港中文大学化学系, 香港)

收稿日期:2010-12-23 修回日期:2011-03-08 出版日期:2011-11-20 网络出版日期:2011-11-11
基金资助:
国家自然科学基金(21067004); 江西省自然科学基金(2010GZH0048); 江西省教育厅青年科学基金(GJJ10150); 厦门大学固体表面物理化学国家重点实验室开放基金(200906)

Hydrothermal Synthesis and Photocatalytic Performance of Bi₂WO₆/ZnO Heterojunction Photocatalysts

YU Chang-Lin¹, YANG Kai¹, YU Jimmy C², CAO Fang-Fang¹, LI Xin1, ZHOU Xiao-Chun¹

(1. School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China; 2. Department of Chemistry, The Chinese University of Hong Kong, Hong Kong, China)

Received:2010-12-23 Revised:2011-03-08 Published:2011-11-20 Online:2011-11-11
Supported by:
National Natural Science Foundation of China (21067004); Natural Science Foundation of Jiangxi Province (2010GZH0048), the Young Science Foundation of Jiangxi Province Education Office (GJJ10150) and Open Foundation of State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University (200906)

摘要/Abstract

摘要： 在不同温度下(120~220℃), 利用水热法制备了含1wt%、2wt%、4wt% 和8wt% Bi₂WO₆的异质结型Bi₂WO₆/ZnO复合光催化剂, 采用X射线粉末衍射(XRD)、扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)、紫外可见漫反射(UV-Vis) 吸收光谱及光致发光光谱(PL)等系列手段对所制备的光催化剂进行了表征, 并以紫外光(365nm)为光源, 酸性橙II为降解对象, 进行光催化活性测试, 考察了不同Bi₂WO₆复合量及不同水热温度对ZnO光催化剂反应活性的影响.研究表明, 异质结型Bi₂WO₆/ZnO复合光催化剂的光催化活性明显优于纯ZnO和Bi₂WO₆. 当复合4wt%Bi₂WO₆水热处理温度为150℃时, 所制备的复合光催化剂的光催化活性最佳, 为纯ZnO的2.6倍.活性提高的主要原因是形成的Bi₂WO₆/ZnO异质结能显著降低光生电子和空穴对的复合几率, 并改善了异质结型Bi₂WO₆/ZnO复合光催化剂的表面性能.

关键词: 水热法, 钨酸铋/氧化锌异质结, 光催化, 酸性橙II

Abstract: A series of Bi₂WO₆/ZnO heterojunction photocatalysts with different Bi₂WO₆ concentrations (1wt%, 2wt%, 4wt%, 8wt%) were prepared by hydrothermal method at different temperatures(120℃-220℃). The prepared pure ZnO, Bi₂WO₆ and Bi2WO6/ZnO heterojunction photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscope (FT-IR), UV-Vis diffuse reflectance spectra, and photoluminescence (PL) spectroscope, respectively. The photocatalytic activity of the prepared catalysts was evaluated by photocatalytic degradation of acid orange II under UV light (λ=365nm) irradiation. Results show that the photocatalytic activity of Bi₂WO₆/ZnO heterojunction photocatalysts is superior to that of pure ZnO and Bi₂WO₆. The optimal concentration of Bi₂WO₆ is 4wt% and the best hydrothermal temperature is 150℃. Under the above conditions, the prepared composite catalyst shows about 2.4 times in activity of the pure ZnO. The formation of Bi₂WO₆/ZnO heterojunction could effectively suppress the recombination of the photo generated electron and hole pairs and result in an increase in photocatalytic activity. Moreover, more surface OH groups over the Bi₂WO₆/ZnO heterojunction photocatalysts will further benefit the improvement of photocatalytic activity.

Key words: hydrothermal, Bi₂WO₆/ZnO heterojunction, photocatalysis, acid orange II

中图分类号:

TB321
O643

余长林, 杨凯, YU Jimmy C, 操芳芳, 李鑫, 周晓春. 水热合成Bi₂WO₆/ZnO异质结型光催化剂及其光催化性能[J]. 无机材料学报, 2011, 26(11): 1157-1163.

YU Chang-Lin, YANG Kai, YU Jimmy C, CAO Fang-Fang, LI Xin1, ZHOU Xiao-Chun. Hydrothermal Synthesis and Photocatalytic Performance of Bi₂WO₆/ZnO Heterojunction Photocatalysts[J]. Journal of Inorganic Materials, 2011, 26(11): 1157-1163.

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水热合成Bi₂WO₆/ZnO异质结型光催化剂及其光催化性能

Hydrothermal Synthesis and Photocatalytic Performance of Bi₂WO₆/ZnO Heterojunction Photocatalysts

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