| pg-C3N4/BiOBr/Ag复合材料的制备及其光催化降解磺胺甲唑 |
| 摘要点击 2606 全文点击 684 投稿时间：2020-09-21 修订日期：2020-12-03 |
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| 中文关键词 磺胺甲唑 光催化 氮化碳 溴氧化铋 银 |
| 英文关键词 sulfamethoxazole photocatalytic carbon nitride BiOBr Ag |
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| 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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