摘要
采用液相沉淀法制备了FeVO4光催化剂样品,分别研究了不同的制备条件(V/Fe物质的量比、沉淀反应pH值和煅烧温度)对样品的理化性能及其光催化性能的影响。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和DRS等方法对样品结构和形貌进行分析和表征,并通过在紫外灯和可见光照射下降解一定浓度的甲基橙溶液,评价其光催化活性。实验结果表明:当V/Fe物质的量比为1、pH值为8时生成沉淀,并于800℃煅烧4h后制得三斜型FeVO4,禁带宽度为2.05eV;在40W紫外灯照射下对甲基橙溶液的脱色率最大,100min达94%左右。Fe-VO4晶粒表面光滑,形状规则,粒径大约为100nm,部分呈棒状晶形,且其在可见光下也具有一定的光催化活性,20W节能灯照射下对甲基橙溶液的脱色率达82.3%左右。
FeVO4 photocatalysts are successfully prepared by liquid phase precipitation. The effects of different factors（V/Fe molar ratio, precipitation pH and calcination temperature） on the characterization of FeVO4 are discussed. The as-prepared samples are characterized by XRD, SEM and DRS. The photoeatalytic activity is measured by means of photodegradation of methyl orange（MO） in the solution irradiated by ultraviolet light. It is found that the samples prepared with the V/Fe molar ratio being 1, pH=8 and calcinated at 800℃ for 4 hours have the best ability of photodegradation of MO, the degradation rate reaches 94% or so after 100 minutes UV irradiation. The sample is the FeVO4 triclinic and its band is about 2. 05eV. There are some round-shaped samples with diameters about 100nm and some rod-shaped. Also, the prepared samples have photocatalytic activity under visible-light and the MO photodegradation ratio reaches 82. 30% under saving-energy light（20W） irradiation.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2009年第8期24-27,39,共5页
Materials Reports
基金
国家重点基础研究发展计划资助项目(2005CB121104)
