Ag-BiVO_4催化剂的制备及其用于光催化氧化噻吩  

Prepatation of Ag-BiVO_4 Catalyst and Its Application to Photocatalytic Oxidative Desulfurization

作　　者：高晓明[1] 付峰[1] 张理平[1] 武玉飞[1] 王静[1] 王继武[1] 

机构地区：[1]延安大学化学与化工学院陕西省化学反应工程重点实验室,陕西延安716000

出　　处：《石油化工》2012年第1期41-45,共5页Petrochemical Technology

基　　金：陕西省教育厅项目(09JK816)

摘　　要：采用水热法合成了可见光催化剂Ag-BiVO4,并对其进行了XRD和UV-Vis DRS表征。以噻吩的正辛烷溶液为含硫模型化合物溶液,考察了Ag-BiVO4催化剂前体的pH、Ag-BiVO4催化剂用量和空气流量等工艺条件对脱硫率的影响,研究了Ag-BiVO4催化剂光催化氧化噻吩的性能。表征结果显示,Ag的掺杂没有改变BiVO4的晶相,在Ag-BiVO4催化剂前体的pH为7的条件下制备的Ag-BiVO4催化剂(Ag-BiVO4(pH=7))结晶度较好,吸收边带明显红移,禁带宽度窄于纯BiVO4。实验结果表明,Ag-BiVO4(pH=7)催化剂活性最高,在空气流量为300 mL/min、Ag-BiVO4(pH=7)催化剂加入量为1.0 mg/L、400 W金卤灯照射180 min的条件下,脱硫率可达95%。Ag-BiVO4 photocatalysts were prepared by hydrothermal method and were characterized by means of UV-Vis DRS and XRD. The desulfurization activity of Ag-BiVO4 catalysts for thiophene in octane as model sulfur compounds was researched by photocatalytic oxidation under visible light. The effects of the precursor pH, Ag-BiVO4 catalyst dosage and air flux on the desulfurization rate were investigated. The results indicated that the Ag doping did not change the crystal phase of BiVO4, and the crystallinity of Ag-BiVO4 prepared with BiVO4 precursor pH 7 （Ag-BiVO4（pH=7）） was the best. Under the optimal conditions of air flux 300 mL/min, Ag-BiVO4（pH=7） catalyst dosage 1.0 mg/L and illumination time 180 min with 400 W metal halide light, the desulfurization rate could reach 95%. The Ag-BiVO4 catalyst had a significant red-shift in the absorption band in the visible region, and the width of its forbidden band was narrower than that of BiVO4.

关 键 词：水热合成 Ag—BiVO4催化剂 噻吩 光催化 脱硫 

分 类 号：TQ032[化学工程]