纳米FeVO_4的制备及其可见光下降解甲苯的性能

以Fe(NO3)3或FeCl3作为铁源,采用水热法制备了纳米FeVO4光催化剂,通过XRD、SEM、DRS等手段表征了所合成FeVO4的物相、表面形貌及光学性质,研究了其可见光下光催化降解甲苯的性能。表征结果显示:FeVO4平均晶粒尺寸约为75 nm,为棒状;FeVO4在可见光区域(λ400 nm)表现出较高的吸光性,其吸光区域可红移至约600 nm;以FeCl3为铁源,水热反应3 h制备的FeVO4的禁带宽度为2.1 e V;以Fe(NO3)3为铁源制备的FeVO4的比表面积(74.70 m2/g)大于以FeCl3为铁源制备的FeVO4的比表面积(67.72 m2/g)。在初始甲苯质量浓度为494 mg/L、FeVO4为光催化剂、反应4 h的条件下,甲苯降解率达62%。甲苯降解最终产物为CO2和H2O。

Preparation of Nano FeVO4 and Its Degradation Capability to Toluene Under Visible Light

The nano FeVO₄ photocatalyst was prepared by hydrothermal method using Fe（NO₃）₃ or FeCl₃ as Fe source,and was characterized by XRD,SEM and DRS. Its photocatalytic properties on toluene degradation under visible light were investigated. The characterization results show that：The FeVO₄ grain is rodlike crystal with 75 nm of the average size;In the visible light region （λ>400 nm）,FeVO₄ has high absorbance and its light absorption region extends to about 600 nm （red shift）;The band gap of FeVO₄ prepared using FeCl₃ as Fe source and hydrothermal reacted for 3 h is 2.1 eV;The surface area of FeVO₄ prepared using Fe（NO₃）₃ as Fe source （74.70 m²/g） is larger than that using FeCl₃ （67.72 m²/g）. Under the conditions of initial toluene mass concentration 494 mg/L,using FeVO₄ as photocatalyst and reaction time 4 h,the degradation rate of toluene reaches 62%. And the final products from toluene degradation are CO₂ and H₂O.