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pg-C3N4/BiOBr/Ag复合材料的制备及其光催化降解磺胺甲唑

本站小编 Free考研考试/2021-12-31

中文关键词磺胺甲唑光催化氮化碳溴氧化铋 英文关键词sulfamethoxazolephotocatalyticcarbon nitrideBiOBrAg
作者单位E-mail
杨利伟长安大学建筑与工程学院, 西安 710000408802216@qq.com
刘丽君长安大学建筑与工程学院, 西安 710000
中国环境科学研究院, 北京 100012
夏训峰中国环境科学研究院, 北京 100012
朱建超中国环境科学研究院, 北京 100012
高生旺中国环境科学研究院, 北京 100012gaosw@craes.org.cn
王洪良中国环境科学研究院, 北京 100012
王书平中国环境科学研究院, 北京 100012
中文摘要 通过简易的高温煅烧和共沉淀方法成功制备出pg-C3N4/BiOBr/Ag复合材料,通过XRD、SEM、TEM、XPS、UV-Vis、BET和光电流等检测手段对其进行表征,并探究了该复合材料在模拟可见光照射下对10 mg·L-1磺胺甲唑的降解效果.结果表明,当银单质的负载比例为5%时,pg-C3N4/BiOBr/Ag复合材料对磺胺甲唑的降解效果最佳.与pg-C3N4、BiOBr单体和二元复合材料pg-C3N4/BiOBr相比,pg-C3N4/BiOBr/Ag(5%)光催化降解磺胺甲唑的效果显著提升,在30 min内降解率几乎接近100%,反应速率常数(0.2101 min-1)是pg-C3N4/BiOBr的13.15倍.通过自由基猝灭实验,证明在光催化降解过程中,起主要作用的活性物质是空穴(h+)、超氧自由基(·O2-)和单线态氧(1O2),其中,超氧自由基(·O2-)贡献最大.对pg-C3N4/BiOBr/Ag进行多次循环实验,证明合成的材料具有良好的循环稳定性能,应用前景良好. 英文摘要 A pg-C3N4/BiOBr/Ag composite was successfully prepared by simple high-temperature calcination and co-precipitation methods. The composite was characterized by means of XRD, SEM, TEM, XPS, UV-Vis, BET, and photocurrent analyses alongside other detection methods, and the degradation of 10 mg·L-1 sulfamethoxazole was investigated under simulated visible light irradiation. The results showed that the pg-C3N4/BiOBr/Ag composite had the best degradation effect on sulfamethoxazole when the loading ratio of silver was 5%. Compared with pg-C3N4, BiOBr monomer, and pg-C3N4/BiOBr composite, the photocatalytic degradation effect of the pg-C3N4/BiOBr/Ag (5%) was significantly improved, and the degradation rate was almost 100% within 30 min. The reaction rate constant (0.21016 min-1) was 13.15 times that of pg-C3N4/BiOBr. Through radical quenching experiments, it was shown that the main active substances in the photocatalytic degradation were holes (h+), superoxide radicals (·O2-), and singlet oxygen (1O2), among which superoxide radicals (·O2-) contributed the most. Cyclic tests of pg-C3N4/BiOBr/Ag showed that the synthesized material has good recyclability and application prospects.

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