pH值对基于TTAB的BiVO_4晶体形貌及光催化性能的调控  

Influence of pH on Morphology and Photocatalytic Property of BiVO_4 Prepared with TTAB

作　　者：林杰[1] 李贤英[1] 陈秋玲[1] 薛罡[1] 

机构地区：[1]东华大学环境科学与工程学院,上海201620

出　　处：《材料科学与工程学报》2015年第2期211-216,共6页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(51178093;51208086);中央高校项目经费资助项目(2232013D3-10)

摘　　要：以十四烷基三甲基溴化铵（TTAB）为模板,采用水热合成法可控制备BiVO4微晶。利用X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、比表面测定仪和紫外可见漫反射（UV-Vis DRS）等技术,表征了水热反应前驱液的pH值（pH=1.5-9）对BiVO4的晶体结构、形貌、比表面积和光学性能的影响,并在可见光照射下考察了BiVO4样品对罗丹明B的光催化降解活性。结果表明,随着pH值的增大,所得产物由单斜晶系向单斜晶系与四方晶系的混晶转变,且形貌由多面体向多孔微球转变。当pH为5~7时,所制备的BiVO4样品具有独特的形貌、较大的比表面积和良好的多孔结构,表现出优越的光催化活性,对罗丹明B降解率可高达90.4%。。Visible light photocatalyst BiVO4 with controllable morphologies were prepared with the assistance of tetradecyl trimethyl ammonium bromide （TTAB） under different pH values （pH=1. 5-9） via the hydrothermal method. The as-prepared samples were characterized by means of X-ray powder diffraction （XRD）, field-emission scanning electron microscopy （FE-SEM）, specific surface area determinator and UV-vis diffuse reflectance spectra （DRS）. The results show that with the increase in pH value, the crystalline phase of the BiVO4 samples transforms from monoclinic to a mixture of monoelinic and tetragonal, while the morphology changes from polyhedron to porous microsphere. The visible photocatalytic test of degrading RhB indicates that the BiVO4 samples under pH value of 5-7 show superior photocatalytic performance （with the degradation rate of 90.4%） for its unique morphology, high specific surface area and good porous structure.

关 键 词：钒酸铋 多孔结构 水热合成 可见光响应型光催化剂 

分 类 号：O614.51[理学—无机化学]