I/TiO2-BiOBr@SBA-15的制备及光催化性能研究

Preparation and photocatalytic properties of I/TiO2-BiOBr@SBA-15

由于有机染料废水具有排放量大、浓度高和难脱色等特点,由此所造成的环境污染问题已经成为人类面临的重大挑战之一。介孔材料因具有高稳定性、孔径可调和高比表面积等优点,被广泛用于光催化降解有机染料领域。但仅靠介孔材料的吸附性能很难将有机染料完全去除。在介孔材料中引入第二金属或金属氧化物是提高其降解效率的一种有效途径。因此,选用非离子表面活性剂三嵌段共聚物EO20PO70EO20(P123)为模板制备介孔SiO2材料,继而通过静电作用将TiO2负载到介孔材料表面及内部,并将I和BiOBr分别掺杂和负载到TiO2表面来调控其能带结构,提高光催化性能,重点研究不同TiO2与BiOBr的物质量比对光催化降解效率的影响。结果表明,当TiO2与BiOBr的物质量比为3:1时,对罗丹明B的光催化降解性能最好,在紫外-可见光灯照射后10 min对罗丹明B的降解率可达100%,所制备的介孔I/TiO2-BiOBr@SBA-15复合材料有望用于工业废水的处理。

At present,environmental pollution caused by organic dye wastewater with large discharge,high concentration,and difficult to decolorize has become one of the major challenges facing humankind.Mesoporous materials are widely used in the field of photocatalytic degradation due to their advantages such as high stability,adjustable pore size,and high specific surface area.However,it is difficult to completely remove the dye only by the adsorption performance of the mesoporous material.Therefore,introducing a second metal or metal oxide into the mesoporous material is an effective way to improve its degradation efficiency.Therefore,in this paper,the non-ionic surfactant triblock copolymer EO20PO70EO20(P123)was used as a template to synthesize mesoporous SiO2 material.The TiO2 was loaded on the surface and the interior of the mesoporous material by electrostatic action,and I and BiOBr were doped and loaded respectively on the surface of TiO2 to affect its band structure,and then improve the photocatalytic performance.The effect of different TiO2 and BiOBr mass ratio on photocatalytic degradation efficiency was studied.The results show that when the mass ratio of TiO2 to BiOBr was 3∶1,the photocatalytic degradation performance of rhodamine B was the best.The degradation rate of rhodamine B could reach 100%in 10 minutes after the lamp was turned on.Mesoporous I/TiO2-BiOBr@SBA-15 composite material was expected to be used for industrial wastewater treatment.