Ag/CeO<sub>2</sub>/BiOBr材料的制备及其对卡马西平的降解研究

doi:10.11894/iwt.2019-0949

摘要/Abstract

摘要：

通过共沉淀法和原位光沉积法成功制备了Ag/CeO₂/BiOBr复合材料，采用XRD、SEM、BET、UV-vis DRS对其进行表征，并考察该材料用于光催化降解水溶液中卡马西平的效果。研究结果表明，与CeO₂、BiOBr、CeO₂/BiOBr相比，Ag/CeO₂/BiOBr对可见光具有更强的吸收性能，180 min时对卡马西平的降解率可达83.64%。自由基捕获实验结果表明，催化剂降解卡马西平中起主要作用的活性基团是·O₂^-和h⁺。Ag的负载提高了光催化材料对可见光的利用效率，促进了光生载流子的分离，从而增强了其催化活性。循环实验结果表明，Ag/CeO₂/BiOBr复合材料具有良好的稳定性，循环使用3次后仍具有较高催化活性。

关键词: Ag/CeO₂/BiOBr, 卡马西平, 光催化降解

Abstract:

Ag/CeO₂/BiOBr composite was successfully synthesized by coprecipitation method coupled with in-situ photodeposition method and characterized by XRD, SEM, BET and UV-vis DRS. The as-prepared samples were applied to photocatalytic degradation of carbamazepine in aqueous solution. The results indicated that Ag/CeO₂/BiOBr composite showed stronger absorption characteristics in the visible-light region compared with CeO₂, BiOBr and CeO₂/BiOBr. After irradiation for 180 min, the degradation rate of carbamazepine was up to 83.64%. The radical trapping experiments revealed that·O₂^- and h⁺ were the dominant active species involved in carbamazepine degradation. The loading of Ag improved the absorption rate of photocatalytic materials for visible light and the separation rate of photogenerated electron-hole pairs, which enhanced its catalytic activity. The cycle experiment showed that the Ag/CeO₂/BiOBr composite had good stability, and it still maintained high catalytic activity after 3 cycle runs.

Key words: Ag/CeO₂/BiOBr, carbamazepine, photocatalytic degradation

中图分类号:

X703.1

王娅乔,高生旺,朱建超,王国英,夏训峰,王丽君. Ag/CeO₂/BiOBr材料的制备及其对卡马西平的降解研究[J]. 工业水处理, 2020, 40(9): 59-64.

Yaqiao Wang,Shengwang Gao,Jianchao Zhu,Guoying Wang,Xunfeng Xia,Lijun Wang. Synthesis of Ag/CeO₂/BiOBr for degradation of carbamazepine[J]. Industrial Water Treatment, 2020, 40(9): 59-64.

https://www.iwt.cn/CN/Y2020/V40/I9/59

图/表 9

图1 CeO₂、BiOBr、CB、ACB的XRD

图2 CeO₂、BiOBr、CB、ACB的SEM

表1 氮气吸附-脱附检测样品的比表面积

催化剂	CeO₂	BiOBr	CB	ACB
比表面积/（m²·g^-1）	67.256 1	16.849 8	26.532 2	23.912 1

图3 BiOBr、CeO₂、CB、ACB的UV-vis DRS

图4 复合材料在模拟太阳光下对卡马西平的光催化降解性能

图5 催化剂投加量对复合材料光催化降解卡马西平的影响

图6 pH对复合材料光催化降解卡马西平的影响

图7 卡马西平降解过程中的自由基捕获实验

表2 ACB光催化剂的稳定性实验

循环次数	第1次	第2次	第3次
降解率/%	85.765	81.735	78.692

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Ag/CeO₂/BiOBr材料的制备及其对卡马西平的降解研究

Synthesis of Ag/CeO₂/BiOBr for degradation of carbamazepine