论文部分内容阅读
采用溶胶凝胶法以Bi(NO_3)_3.5H2O,NH4VO3和柠檬酸为原料,在不同Bi、V摩尔比下制备了BiVO_4薄膜。通过XRD,FE-SEM,PL来研究不同Bi、V摩尔比对薄膜的结构,形貌及发光性能的影响,通过在可见光下降解罗丹明B来研究样品的光催化性能。结果表明:当n_(Bi)=n_V=1:1,1:1.2时,合成样品为纯单斜相BiVO_4薄膜。当n_(Bi):n_V=1:1.5时合成的样品除BiVO_4外还存在V_4O_9,n_(Bi):n_V=1:0.8时合成的为Bi_2O_(2.75)/BiVO_4复合光催化剂。n_(Bi):n_V=1:0.8和1:1.5时合成的薄膜光催化效果优于n_(Bi):n_V=1:1,1:1.2时合成的BiVO_4薄膜,其中当n_(Bi):n_V=1:1.5合成的薄膜光催化效果最好。
BiVO_4 thin films were prepared by sol-gel method using Bi (NO_3) _3.5H_2O, NH_4VO_3 and citric acid as raw materials under different Bi and V molar ratios. The effects of different molar ratios of Bi and V on the structure, morphology and luminescent properties of the films were investigated by XRD, FE-SEM and PL. The photocatalytic activity of the samples was studied by observing the degradation of rhodamine B in visible light. The results show that when n_ (Bi) = n_V = 1: 1, 1: 1.2, the synthesized samples are pure monoclinic BiVO_4 films. When n_ (Bi): n_V = 1: 1.5, Bi_2O_ (2.75) / BiVO_4 composite photocatalyst was synthesized with the addition of V_4O_9 and Bi_ (n_V) = 1: 0.8. The BiVO_4 thin film synthesized at n_ (Bi): n_V = 1: 0.8 and 1: 1.5 is superior to the BiVO_4 thin film synthesized with n_ (Bi): n_V = n_V = 1: 1.5 The best photocatalytic activity of the synthesized films.