BiOBr/CeO2复合材料的制备及光催化降解磺胺异恶唑

doi:10.19894/j.issn.1000-0518.200231

摘要/Abstract

摘要： 通过高温煅烧法和共沉淀法成功制备BiOBr/CeO₂复合材料,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和比表面积孔径分析仪(BET)等手段对光催化材料进行表征,并将该复合材料用于光催化降解磺胺异恶唑。研究表明, BiOBr/CeO₂对可见光有更高的吸收性能,比CeO₂和BiOBr具有更强的降解效率。自由基捕获实验证明,催化剂降解过程中起主要作用的活性基团是·O^-₂和h⁺。 CeO₂的复合提高了材料的光利用效率,能够促进光生电荷分离,进而提高材料的光催化活性。回收再利用实验表明,BiOBr/CeO₂复合材料具备较好的稳定性,循环3次后催化活性无明显衰减。

关键词: 光催化降解, BiOBr/CeO₂, 磺胺异恶唑, 催化机理

Abstract: BiOBr/CeO₂ composites were successfully synthesized by the high-temperature calcination method coupled with the co-precipitation method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and specific surface area and pore size analyzer (BET) etc. The composites were used for photocatalytic degradation of sulfisoxazole in solution. The results reveal that BiOBr/CeO₂composites have a stronger and broader absorption band in the visible-light region, and a higher efficiency of degradation of sulfisoxazole compared with CeO₂ and BiOBr. The radical trapping experiments indicate that the main active species in the degradation of sulfisoxazole are ·O^-₂ and H⁺. The load of CeO₂ can improve the utilization of visible light and the separation rate of photogenerated electron-hole pairs, which enhances the photocatalytic activity of composites. The recycling experiment shows that the BiOBr/CeO₂ composites have good stability and the catalytic activity does not decrease obviously after three cycles.

Key words: Photocatalytic degradation BiOBr/CeO₂, Sulfisoxazole, Photocatalytic mechanism

中图分类号:

赵星鹏, 王娅乔, 高生旺, 朱建超王国英, 夏训峰, 王洪良, 王书平. BiOBr/CeO₂复合材料的制备及光催化降解磺胺异恶唑[J]. 应用化学, 2021, 38(4): 422-430.

ZHAO Xing-Peng, WANG Ya-Qiao, GAO Sheng-Wang, ZHU Jian-Chao, WANG Guo-Ying, XIA Xun-Feng, WANG Hong-Liang, WANG Shu-Ping. Synthesis of BiOBr/CeO₂ Composites for Photocatalytic Degradation of Sulfisoxazole[J]. Chinese Journal of Applied Chemistry, 2021, 38(4): 422-430.

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BiOBr/CeO₂复合材料的制备及光催化降解磺胺异恶唑

Synthesis of BiOBr/CeO₂ Composites for Photocatalytic Degradation of Sulfisoxazole

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