微波法合成纳米FeVO_4及其光催化性能

PREPARATION OF NANOMETER FeVO_4 BY MICROWAVE METHOD AND ITS PHOTOCATALYSIS

通过微波法合成纳米Fe VO_4光催化剂,用XRD、SEM、UV-Vis DRS对其进行表征,探究不同Fe:V摩尔比、不同微波反应时间及Cu^(2+)掺杂对产物的形貌、结晶度、粒径以及带隙的影响。结果表明,当Fe:V=1、微波反应6 min时,制备条件较优,获得了粒度比较均匀、尺寸较小、形貌比较规则的Fe VO_4晶体,且结晶度较高、带隙较窄。选取优化条件下制备的Fe VO_4与Fe VO_4:Cu^(2+),在可见光下进行甲基橙降解试验。在初始甲基橙浓度为10 mg/L、反应160min时,Fe VO_4:Cu^(2+)对甲基橙的降解率达到76.4%。

FeVO_4 photocatalyst was prepared by microwave method.The effects of molar ratio of Fe:V,reaction time and Cudoped product on the morphology,crystal phase and band gap were investigated by XRD,SEM and UV-Vis DRS.The results indicated that crystalline FeVO_4with regularly spherical shape,relatively uniform and small size was obtained under the optimized conditions,like Fe:V=1,reaction time of 6 min.The crystallinity of the product was high and the band gap was narrow.The FeVO_4or FeVO_4:Cu^(2+)prepared under optimized conditions were used to degrade methyl orange under visible light radiation.The result showed that by using FeVO_4:Cu^(2+)as the photocatalyst,the degradation rate of 10mg/L methyl orange reached 76.4%after 160 min of viable light radiation.