基于BiOX(X=Cl、Br、I)新型高性能光催化材料的最新研究进展

铋系半导体Bi OX(X=Cl、Br、I)因其独特的层状结构和合适的禁带宽度而表现出优异的光催化活性与稳定性,已成为光催化材料领域极具应用前景的材料体系。本文首先针对Bi OX(X=Cl、Br、I)光催化材料研究中的关键科学问题进行了深入分析,进一步综述了国内外解决上述关键问题所采取的有效措施,包括:微结构调控、半导体复合、贵金属沉积、离子掺杂和表面敏化等,并针对纳米结构Bi OX(X=Cl、Br、I)负载于合适载体上实现固载的研究进展进行了概述,从而对基于Bi OX(X=Cl、Br、I)新型高性能光催化材料的最新研究进展进行了全面深入的综述,最后展望了Bi OX光催化材料的研究方向与趋势。

Effect of calcination temperature on microstructure and photocatalytic activity of BiOX(X=Cl,Br)

A series of BiOX(X=Cl,Br) were prepared by simple hydrolysis and then calcined at various temperatures and they were characterized by XRD,Raman,SEM,DSC-TGA,BET and UV-Vis.The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange(MO) solution under simulated solar light irradiation.The results show that the phase structure,crystallite size,morphology,specific surface area,porous structure,and the absorption band-edges are related to the calcination temperature.For BiOBr,it has completely transformed to Bi24O31Br10 at 600℃ and begins to transform to Bi2 O3 at 800℃.As for BiOCl,it begins to transform to Bi24O31Cl10 at 600℃ and completely transforms to Bi24O31Cl10 at 800℃.Finally,the photocatalytic activity of BiOCl decreases with the temperature increasing owing to decrease of the specific surface areas and pore size,while the photocatalytic activity of BiOBr increases in the first stage and then decreases,which is related to good crystallization and three-dimensional structure.

液相法制备BiOX (X = F, Cl, Br)微纳米材料研究进展

高效光催化剂的开发一直是光催化降解领域的研究热点。BiOX (X = F, Cl, Br)微纳米材料作为一种新型半导体光催化剂,近年来已有许多学者对其展开了深入研究。本文综述了液相法制备BiOX微纳米材料的研究进展,分别从水热/溶剂热法、共沉淀法、溶胶–凝胶法、水解法等分别列举了各方法制备BiOX微纳米材料的一些示例和流程;分析了阻碍BiOX微纳米材料实际应用的原因,从构建异质结和元素掺杂角度概述了提高BiOX微纳米材料光催化性能的方法。最后,对BiOX微纳米材料今后的研究方向进行了展望。