可见光响应型ZnO/Bi_2O_3复相光催化剂的制备及其性能研究  

Preparation and Properties of ZnO/Bi_2O_3 Multiphase Photocatalytic Materials Response to Visible Light

作　　者：龙腾发[1] 李磊[1] 颜昌琪[1] 何星存[1] 陈孟林[1] 钟山[1] 

机构地区：[1]广西师范大学环境与资源学院,桂林541004

出　　处：《人工晶体学报》2011年第6期1607-1611,共5页Journal of Synthetic Crystals

基　　金：珍稀濒危动植物生态与环境保护省部共建教育部重点实验室基金项目(桂科能1001Z005);广西师范大学青年骨干教师科研基金

摘　　要：以Zn(Ac)2.2H2O和Bi(NO3)3.5H2O为主要原料,采用溶胶-凝胶法成功制备了可见光响应型的高效复相ZnO/Bi2O3催化剂。利用X射线衍射(XRD)、扫描电镜(SEM)对样品进行了表征,并以甲基橙为目标污染物,测试样品的光催化性能,研究了初始合成条件、光源等对样品光催化性能的影响。实验结果表明:在nZn∶nBi为1∶1,浓度为0.05 mol/L条件下制得的凝胶,经600℃煅烧2 h后,样品呈现六方纤锌矿结构的氧化锌晶相并伴有单斜α-Bi2O3、三斜ω-Bi2O3晶相。在16 W紫外灯、500 W卤素灯照射下,2.5 h后,甲基橙的脱色率为95.73%,68.36%,而经太阳光照射2.5 h,甲基橙的脱色率分别为53.8%,但将其继续置于阳台上24 h,脱色率可达97.6%。在16 W紫外灯的辐照下,样品重复使用6次,甲基橙的脱色率仍在90%以上,表明催化剂具有较高的重复使用率。Using Zn（Ac）12·2H2O and Bi（NO3）3·5H2O as the main raw materials, ZnO/Bi2O3 mLtltiphase photocatalytic materials response to visible light with excellent photocatalytic properties were successfully synthesized by sol-gel method. The as-prepared samples were characterized by XRD and SEM, their photocatalytic activities andreusability were investigated under the conditions of different light source using the methyl orange as a target pollutant. The effects of initial synthesis conditions and light source on photocatalytic prope^es were also studied. The results show that the gel prepared under the condition of a Zn/Bi molar ration of 1：1 and concentration of 0.（15 mol/L were calcined at 600℃ for 2 h , the as-prepared samples show to be compose of wurtzite ZnO, monochnic a-Bi2O3, triclinic ω-Bi2O3. The decolorization rate of methyl orange were 95.73%, 68.36% under irradiation of 16 W UV and 500 W halogen lamp for 2.5 h, however under sunlight, that was only 53.8%, but continue to be placed on the balcony for 24 h, the decolorization rate is up to 97.6%. In addition, the catalyst was reused the sixth times, decolorization rate was still up to 90%, indicating catalyst has a high reusability rate.

关 键 词：ZnO/Bi2O3 光催化 溶胶-凝胶法 

分 类 号：O484[理学—固体物理]