研究报告
贾永豪,崔康平,黄千里.WO3/g-C3N4异质结光催化剂的制备和光催化活性探究[J].环境科学学报,2021,41(12):4852-4861
WO3/g-C3N4异质结光催化剂的制备和光催化活性探究
- Synthesis of WO3/g-C3N4 heterojunction photocatalyst and its photocatalytic performance
- 关键词：WO3/g-C3N4 酸性橙G 光催化活性 光降解机理
- 基金项目：国家自然科学基金（No.31770470）
- 作者
- 单位
- 贾永豪
- 合肥工业大学资源与环境工程学院, 合肥 230009
- 崔康平
- 合肥工业大学资源与环境工程学院, 合肥 230009
- 黄千里
- 合肥工业大学资源与环境工程学院, 合肥 230009
- 摘要：采用水热合成和煅烧法制备高催化活性的WO3/g-C3N4材料,并用于酸性橙G废水的降解.同时,采用X射线衍射、漫反射光谱、傅立叶变换红外光谱、扫描电镜和氮吸附-脱附测试、X光子能谱和光致发光光谱方法对复合材料进行了表征.降解实验表明,复合材料的光催化性能比单一WO3和g-C3N4高,且Z型光催化剂WO3/g-C3N4在WO3与g-C3N4质量比为3∶10时具有最高的光催化活性,在105 min内对20 mg·L-1酸性橙G的光降解效率达98%,反应速率是单一g-C3N4的5倍.采用自由基捕获剂分别对体系中的·OH、·O2-和h+进行捕获实验,结果表明,·OH、·O2-和h+共同参与了光催化降解反应,其中,h+是Z型WO3/g-C3N4光催化的主要活性物质.复合催化剂具有良好的重复利用性,在3次循环试验后光降解效率仍达90%.
- Abstract：To degrade Acid Orange G wastewater, WO3/g-C3N4 with high catalytic activity was prepared by hydrothermal synthesis and calcination. The composite materials were characterized by X-ray diffraction, diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy and nitrogen adsorption-desorption testing, X-photon energy spectroscopy and photoluminescence spectroscopy. The degradation experiments showed that the photocatalytic performance of the composite was higher than that of single WO3 and g-C3N4, and the Z-type photocatalyst WO3/g-C3N4 had the highest photocatalytic activity when the mass ratio of WO3 to g-C3N4 was 3∶10. The photodegradation efficiency of 20 mg·L-1 Acid Orange G was 98% in 105 min, and the reaction rate was 5 times of single g-C3N4. In the system of composite material, free radical scavenger was used to capture ·OH, ·O2- and h+. The results showed that ·OH, ·O2- and h+ participated in the photocatalytic degradation, and h+ was the main active material of Z-type WO3/g-C3N4 photocatalysis. The composite catalyst has good reusability, and the photodegradation efficiency still reaches 90 % after three cycles of tests.
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