高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (1): 123-129.doi: 10.7503/cjcu20180498

• 物理化学 • 上一篇    下一篇

Z型光催化剂Sb2WO6/g-C3N4的制备及光催化性能

张晶1, 董玉明1, 刘湘1(), 李和兴2   

  1. 1. 江南大学化学与材料工程学院, 合成与生物胶体教育部重点实验室, 无锡 214122
    2. 上海师范大学资源化学教育部重点实验室, 上海 200234
  • 收稿日期:2018-07-14 出版日期:2019-01-10 发布日期:2018-12-17
  • 作者简介:

    联系人简介: 刘 湘, 男, 博士, 副教授, 主要从事新型催化材料的开发及性能研究. E-mail: liuxiang@jiangnan.edu.cn

  • 基金资助:
    国家自然科学基金(批准号: 21676123)和教育部国家外国专家局高等学校学科创新引智“111”项目(批准号: B13025)资助.

Synthesis and Photocatalytic Activity of Z-Scheme Photocatalyst Sb2WO6/g-C3N4

ZHANG Jing1, DONG Yuming1, LIU Xiang1,*(), LI Hexing2   

  1. 1. Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
    2. Key Laboratory of the Chinese Ministry of Education in Resource Chemistry, Shanghai Normal University, Shanghai 200234, China
  • Received:2018-07-14 Online:2019-01-10 Published:2018-12-17
  • Contact: LIU Xiang E-mail:liuxiang@jiangnan.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No. 21676123) and the Ministry of Education & State Administration of Foreign Experts Affairs of China for the “111” Project, China(No. B13025).

摘要:

通过水热反应合成了Sb2WO6改性的g-C3N4复合材料(Sb2WO6 /g-C3N4). 通过X射线衍射(XRD)、 扫描电子显微镜(SEM)、 紫外-可见漫散射反射光谱(UV-Vis DRS)和光致发光光谱(PL)等表征了样品的性质. 结果表明, Sb2WO6在g-C3N4的表面上生长, 并且复合材料光吸收能力有一定的增强, 光生电子-空穴的重组率降低. 通过罗丹明B(RhB)的光降解评价了Sb2WO6/g-C3N4复合材料的光催化性能. 结果表明, 模拟日光下Sb2WO6质量分数为10%的Sb2WO6/g-C3N4复合材料在60 min内对RhB的降解率为99.3%, 高于纯g-C3N4和Sb2WO6. Sb2WO6/g-C3N4复合材料的这种高度增强的光催化活性主要归因于强的界面相互作用促进了光生电子-空穴分离和迁移. 添加自由基清除剂的实验结果表明, ·O2-和h+是光催化反应中的主要活性物质. Sb2WO6/g-C3N4复合材料在几个反应周期内表现出优异的稳定性. 根据实验结果提出了一种可能的Z型光催化机理.

关键词: Sb2WO6 /g-C3N4, Z型光催化剂, 光催化性能

Abstract:

Sb2WO6 modified g-C3N4(Sb2WO6/g-C3N4) composites were synthesized by hydrothermal reaction. The properties of the Sb2WO6/g-C3N4 composites were analyzed by X-ray diffraction(XRD), scanning electron microscopy(SEM), UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS) and photoluminescence(PL) spectroscopy. The results indicated that the Sb2WO6 grew on the surface of g-C3N4, forming closely contacted interfaces between the Sb2WO6 and g-C3N4 components. The photocatalytic performance of Sb2WO6/g-C3N4 composites was evaluated through the photodegradation of Rhodamine B(RhB). The results showed that 99.3% of RhB was degraded by Sb2WO6/g-C3N4 composites with 10%(mass fraction) of Sb2WO6 in 60 min under simulated sunlight, which was much higher than that of pure g-C3N4 and Sb2WO6. This highly enhanced photocatalytic activity of the Sb2WO6/g-C3N4 composites can be mainly attributed to strong interfacial interaction promoting the photo-generated electron-hole separation and migration. The results of radical scavenger experiments showed that ·O2- and h+ were the dominant reactive species in the photocatalytic reaction. Besides, the Sb2WO6/g-C3N4 composites showed excellent stability over several reaction cycles. Finally, a possible Z-scheme photocatalytic mechanism was proposed based on the experimental results.

Key words: Sb2WO6/g-C3N4, Z-Scheme photocatalyst, Photocatalytic activity

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