Co-BiVO_4光催化剂的制备及其用于光催化氧化噻吩  

Preparation of Co-BiVO_4 Photocatalyst and Its Application in the Photocatalytic Oxidative Thiophene

作　　者：高晓明[1] 付峰[1] 武玉飞[1] 张理平[1] 李稳宏[2] 

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,延安716000 [2]西北大学化工学院,西安710069

出　　处：《无机材料学报》2012年第10期1073-1078,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(21003103);陕西省教育厅自然科学研究项目(09JZ25);延安大学自然科学青年专项基金(YD2011-19)~~

摘　　要：采用水热法制备了掺杂型可见光催化剂Co-BiVO4,用X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外可见漫反射(DRS)和低温氮吸附等表征手段对其结构性质进行了表征.结果显示,Co的掺杂没有改变BiVO4的晶相,在pH=7时制备的Co-BiVO4是单斜晶系白钨矿,晶型较完整.同时Co的掺杂延伸了BiVO4的可见光吸收范围,吸收边带明显红移,能隙禁带宽窄于纯BiVO4.低温氮吸附表明Co-BiVO4催化剂(pH=7)的孔半径主要分布在2.67 nm附近.在空气–有机溶剂体系中,研究了Co-BiVO4氧化脱除FCC汽油中特征硫化物噻吩的效果.实验结果表明,催化剂加入量为1.0 mg/L,空气通气量为150 mL/min,氙灯光照3.0 h,Co-BiVO4(pH=7.0)对模拟汽油的脱硫率可达到86%.The Co-BiVO4 photocatalyst was prepared by hydrothermal method and characterized by X-ray diffraction,scanning electron microscope,UV-Vis absorption spectroscope,and low-temperature N2 adsorption.The characterized results indicate that highly crystalline monoclinic scheelite structure of Co-BiVO4 is obtained at pH=7 and the Co dopant does not change the crystal phase of BiVO4.The Co-BiVO4 has a significant red-shift in the absorption band in the visible region,and its absorption intensity increases greatly for the doped catalyst compared with pure BiVO4.Low-temperature N2 adsorption result reveals that the pore size of the Cu-BiVO4（pH=7） mostly distributes at 2.67 nm.The desulfurization ability of Co-BiVO4 was researched by photocatalytic oxidation of thiophene in visible light.The results show that the Co-BiVO4 photocatalysts exhibit higher photocatalytic activities for degradation of thiophene under visible light irradiation.When pH value is 7.0 and the hydrothermal synthesize time is 8 h,the photocatalytic activities reach the maximum.Under the conditions of 150 mL/min air flow,1.0 mg/L catalyst amount,and visible light irradiation for 3 h in 400 W xenon lamp light,the desulfurization rate by Co-BiVO4at 600 mg/L initial concentration increases to 86%.

关 键 词：Co-BiVO4 光催化剂 氧化脱硫 噻吩 

分 类 号：TQ032[化学工程]