Gd^(3+)掺杂BiVO_(4)方块饼粉体水热制备及可见光光催化性能

Preparation and visible-light photocatalytic property of Gd^(3+)-doped BiVO_(4) powders with square cake shape by hydrothermal synthesis method

以乙二胺四乙酸(EDTA)作为铋源络合剂,通过添加缓冲液控制前驱液pH值,采用水热合成技术制备Gd^(3+) 掺杂BiVO_(4)粉体。利用X射线衍射(XRD)和扫描电镜(SEM)表征粉体的相组成、结构和微观形貌,考察Gd^(3+) 掺杂对BiVO_(4)粉体在发光二极管日光灯(LED灯)照射下降解罗丹明 B的可见光光催化性能影响。结果表明:水热法制备的Gd^(3+) 掺杂BiVO_(4)粉体与纯BiVO_(4)粉体的晶型均为单斜白钨矿晶型,结晶度良好,粉体微观形貌为大小约为500 nm 方块饼形。Gd^(3+) 掺杂提高BiVO_(4)粉体的可见光催化性能,其中Gd^(3+) 掺杂摩尔比为6%时是最佳,它同时提高罗丹明 B的降解速率和最终降解率,LED灯光照射掺杂6%Gd^(3+) BiVO_(4)粉体90 min时罗丹明 B降解率为46.7%,而纯BiVO_(4)光照120 min时罗丹明 B降解率只有24.2%。

Using ethylenediamine tetraacetic acid(EDTA)as complexing agent of bismuth source,controlling pH value of precursor solution by adding of a buffer,Gd^(3+)-doped BiVO_(4) powders was prepared by hydrothermal synthesis technology.The phase composition,structure and morphology of BiVO_(4) powder were characterized by X-ray diffraction(XRD)and scanning electron microscope(SEM).The effect of Gd^(3+)doping on the visible light photocatalytic performance of BiVO_(4) powders for the degradation of Rhodamine B under the irradiation of light-emitting diode fluorescent lamp(LED lamp)was investigated.The results show that the crystal structure of Gd^(3+)-doped BiVO_(4) powders and pure BiVO_(4) powders prepared by hydrothermal method are monoclinic scheelite crystal system with good crystallinity,and the morphology of the powders has a shape of square cake with a size of about 500 nm.Gd^(3+)doping improves the visible photocatalytic performance of BiVO_(4) powders,and the effect is the best when the molar ratio of Gd^(3+)doping is 6%.It both improves the degradation rate and final degradation rate of Rhodamine B When LED light irradiates 6%Gd^(3+)-doped BiVO_(4) powders for 90 min,the degradation rate of Rhodamine B is 46.7%,but when pure BiVO_(4) is illuminated for 120 min,the degradation rate of Rhodamine B is only 24.2%.