白钨矿结构BiVO_4的水热合成及其可见光催化性能  

Hydrothermal Synthesis and Photocatalysis Properties of BiVO_4 with Scheelite Structure

作　　者：杨锦瑜[1,2] 朱莉萍[3] 申婧[1] 唐天敏[1] 

机构地区：[1]贵州师范大学化学与材料科学学院,贵阳550001 [2]贵州师范大学贵州省功能材料化学重点实验室,贵阳550001 [3]贵州师范大学职业技术学院,贵阳550001

出　　处：《半导体光电》2014年第2期258-262,共5页Semiconductor Optoelectronics

基　　金：贵州省自然科学基金项目(黔科合J字[2012]2269号);贵州省高层次人才科研特助经费项目(TZJY2011-40)

摘　　要：以Bi(NO3)3·5H2O和NH4VO3为原材料,采用水热法合成了BiVO4可见光催化材料,并采用XRD、SEM和UV-Vis等对合成产物的物相结构、形貌、光吸收性能以及光催化性能进行了研究。研究表明,反应体系的pH值对合成产物的物相结构具有重要的影响,在酸性和弱碱性条件下可获得具有不规则纳米片状形貌的单斜白钨矿结构BiVO4晶体。合成产物对波长小于525nm的光具有强烈的吸收。水热条件的不同直接影响着产物对甲基橙溶液的可见光催化降解性能,在Bi∶V比例为1∶1,同时pH值为3.08并于160℃下水热处理1h所合成的BiVO4晶体对甲基橙溶液具有最佳的可见光催化活性。The visible-light responsive photocatalyst BiVO4 crystals were prepared via a hydrothermal synthesis with Bi（NO3）3 ·5H2O and NH4VO3 as the raw materials. The crystal structure, particle size, morphologies and optical properties of the as-synthesized samples were investigated by XRD, SEM and UV-Vis tests. The results reveal that pH value of the precursor solution plays an important role in determining the phase of the as-synthesized products. The XRD and SEM results of the products which were synthesized under acidic or weak alkaline condition show that those samples possess a pure monoclinic scheelite structure of BiVO4, and exhibite irregular lamellar-like shape. The absorption edge of the as-prepared BiVO4 crystals is located at 525 nm. The reaction conditions have significant influence on the photocatalytic property of the as-synthesized products. When Bi ： V is 1 ：1, pH value is 3.08, temperature is 160 ℃, and hydrothermal treatment time is 1 h, the photocatalytic activities reach the maximum.

关 键 词：水热法 BIVO4 单斜白钨矿结构 光催化 

分 类 号：TB383[一般工业技术—材料科学与工程]