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.FeVO4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.
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