摘要：

通过简单的溶剂热法将BiOBr组装到负载了rGO的WO₃纳米管束上，制得复合光催化剂WO₃/rGO/BiOBr（WRB），采用X射线衍射仪（XRD）、扫描电镜（SEM）、傅里叶红外光谱仪（FT-IR）和紫外可见分光光度法（UV-Vis）对WRB进行表征。以环丙沙星（CIP）去除率为优化指标，采用单因素实验探究了复合材料的配比、投加量、溶液pH、光照条件等对WRB光催化降解CIP性能的影响。结果表明，BiOBr均匀地生长在被rGO膜覆盖的WO₃纳米棒上，改变了对光的吸收性能。采用500 W氙灯作为照射光源，WO₃理论摩尔分数40%的复合材料WRB-40（rGO添加量为WO₃质量的1%）为催化剂，在WRB-40投加量为0.67 g/L，溶液pH为9.07，光照时间为120 min条件下，WRB光催化降解CIP的性能达到最佳，降解率可达96.51%。另外，WRB-40对CIP的光催化降解率经4次循环使用后仍保留88.5%，表明其催化效能高、稳定性好。在WO₃和BiOBr之间嵌入一薄层rGO，更有利于光生载流子的传输，从而有效提高异质结的电子传输性能。

关键词: 复合光催化剂, WO₃/rGO/BiOBr, 可见光降解, 环丙沙星

Abstract:

The composite photocatalyst WO₃/rGO/BiOBr(WRB) was prepared by solvothermal method. BiOBr was assembled into the WO₃ nanotube beam loaded with rGO. WRB was characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), Fourier infrared spectroscopy(FT-IR) and UV-Visible spectrophotometry(UV-Vis). Using the removal rate of ciprofloxacin(CIP) as the optimization index, single factor experiments were conducted to investigate the effects of composite material ratio, dosage, solution pH, and light conditions on the photocatalytic degradation performance of CIP by WRB. The results showed that BiOBr was uniformly grown on the WO₃ rods covered by the rGO membrane, with changing the light absorption performance. A 500 W Xenon lamp was used as the irradiation light source, and WRB-40 with a theoretical WO₃ mole fraction of 40%(rGO added at 1% of WO₃ mass) was used as the composite catalyst. Under the conditions of WRB-40 dosage of 0.67 g/L, solution pH of 9.07, and illumination time of 120 min, the CIP degradation effect by WRB reached its optimum, with a degradation rate of 96.51%. In addition, CIP degradation rate remained 88.5% after four cycles experiment, indicating WRB had high catalytic efficiency and great stability. Embedding a thin layer of rGO between WO₃ and BiOBr was more conducive to the transmission of photo-generated carriers, which effectively improved the performance of heterojunction.

Key words: composite photocatalyst, WO₃/rGO/BiOBr, visible light degradation, ciprofloxacin(CIP)

中图分类号: 

• X703

• O643.36