Pt/BiVO_4光催化剂的制备及其光催化降解性能  

Preparation of Pt /BiVO_4 and its photocatalytic activity for the degradation of tetracycline

作　　者：张中杰[1] 关卫省[1] 孙绍芳[1] 吴亚帆[1] 卢昶雨[1] 

机构地区：[1]长安大学环境科学与工程学院,西安710054

出　　处：《环境化学》2014年第6期1003-1009,共7页Environmental Chemistry

基　　金：高等学校博士学科点专项科研基金(20110205110014);中央高校基本科研业务费专项资金项目

摘　　要：采用微波法和光还原沉积法制备了一系列不同Pt含量的Pt/BiVO4光催化剂.采用X射线衍射仪(XRD)、X射线能谱仪(EDS)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)和紫外可见漫反射(UV-vis)对样品进行表征,并以氙灯为光源,四环素为目标污染物,对该光催化剂在可见光(λ>420 nm)下的光催化降解活性进行了评价.实验结果表明,当Pt含量为2wt%时,Pt/BiVO4光催化剂在可见光照射60min条件下对四环素的降解效率达到了87.5%,明显高于纯BiVO422.7%的降解效率.沉积适量的Pt,能显著抑制光生电子与空穴的复合,提高光催化活性.A series of novel Pt /BiVO4 photocatalysts were synthetized by microwave method and photoreduction deposition process. The prepared photocatalysts were characterized by XRD,EDS,TEM,XPS and UV-vis absorption spectroscopy. The photocatalytic activity of the synthesized products was evaluated by the degradation of tetracycline（ TC） under a Xenon lamp irradiation（ cut off λ≤420 nm light through an optical filter）.Compared with pure BiVO4,Pt/BiVO4 photocatalysts showed enhanced photocatalytic degradation activities for TC under visible-light irradiation.Particularly,when Rw（ Pt /BiVO4） was 2%,the products exhibited the highest TC degradation ratio of 87. 5% in 60 min. The degradation ratio of 2wt% Pt /BiVO4 was higher than the single-phase BiVO4（ 22.7%）.The enhanced photocatalytic activity was mainly attributed to the presence of Pt nanoparticles,which suppressed the recombination of photogenerated electrons and holes,and promoted the efficiency of electron-hole separation.

关 键 词：铂 钒酸铋 沉积 光催化降解 四环素 

分 类 号：TQ426[化学工程] X505[环境科学与工程—环境工程]