共模板法一步合成绣球状BiOCl/Br固溶体光催化剂

以乙二醇/十二烷基三甲基溴化铵(EG/DTAB)为共模板剂,一步制得BiOCl/Br的固溶体光催化剂,利用X射线衍射仪、扫描电子显微镜、能谱仪、N2吸附-脱附仪和紫外-可见漫反射光谱仪进行了表征.结果表明,与采用溶剂热法制得的BiOCl分级微球相比,采用EG/DTAB共模板法制得的BiOCl/Br固溶体具有更明显的分层结构,呈绣球状.同时,DTAB的Br-插入到BiOCl的晶格中,形成固溶体,减小了禁带宽度.绣球状BiOCl/Br固溶体具有比商用P25、二维BiOCl纳米片和三维BiOCl分级微球更优异的可见光间接敏化降解染料性能,当nDTAB/nKCl=0.75时,制得的BiOCl/Br固溶体8 min内在可见光下对罗丹明B(Rh B)的降解率达到97.2%;1 h后在可见光下对甲基橙(MO)的降解率达到83.6%.

One-step Synthesis of Hydrangea-like BiOCl/Br Solid Solution Photocatalyst with Co-template Method

Hydrangea-like BiOCl/Br solid solution photocatalysts were prepared by using glycol/dodecyl trimethyl amonium bromide( EG/DTAB) co-template in one step. The catarysts were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, N2 adsorption-desorption, and UV-Vis diffuse reflectance spectroscopy. The results showed that the BiOCl/Br solid solution obtained by the EG/DTAB co-template method had a layered structure like hydrangea, different from BiOCl hierarchical micro-spheres prepared by solvothermal method; the Br- of DTAB was inserted into the lattice of BiOCl to form a solid solution, reducing the band gap of BiOCl. Hydrangea-like BiOCl/Br solid solution showed excellent pho-tocatalytic activity for degradation of rhodamine B( RhB) and methyl orange( MO) under visible light irradia-tion. When the molar ratio of DTAB to KCl was 0. 75, the photocatalytic degradation rate of RhB was 97. 2%within 8 min, and that of MO was 83. 6% with 1 h.