TiO_2纳米光催化剂的低温制备及其性能  

Low-Temperature Preparations and Properties of TiO_2 Nano-Photocatalysts

作　　者：李慧泉[1,2] 张颖[1] 崔玉民[1] 张文保[1] 

机构地区：[1]阜阳师范学院化学化工学院,安徽阜阳236041 [2]南京大学化学系介观化学教育部重点实验室,江苏南京210093

出　　处：《石油化工》2011年第4期439-443,共5页Petrochemical Technology

基　　金：安徽省科技计划项目(090518026);安徽省高校省级自然科学研究项目(KJ2010A254;KJ2010B149);安徽省高校省级教学研究项目(2010JYXM04;2010JYXM19);阜阳师范学院自然科学研究项目(2008LQ14)

摘　　要：采用水热法低温制备了大比表面积的纯金红石型(R)和纯锐钛矿型(A)TiO2纳米光催化剂。采用XRD,TEM,HRTEM,UV-Vis DRS,BET等方法对纳米光催化剂进行了表征;考察了纳米光催化剂的可见光活性和紫外光分解水产氢活性。实验结果表明,蒸馏水作为反应介质合成了纯TiO2(R),而无水乙醇作为反应介质合成了纯TiO2(A);纳米TiO2(R)和TiO2(A)颗粒结晶度良好,形貌分别为棒形和六角形;所制得的TiO2(R)在可见光区域比商品纳米TiO2(P25)表现出更强的光吸收性能;在可见光照射下,TiO2(R)对甲基橙溶液的脱色率达到72.7%(光照6.0h),明显高于P25的47.8%;在紫外光照射下,TiO2(A)的光分解水产氢速率为24.2μmol/h,略低于P25的25.8μmol/h。Rutile（R） and anatase（A） TiO2 nano-photocatalysts with high specific surface area were prepared by hydrothermal method at low-temperature, and characterized by means of XRD, TEM, HRTEM, UV-Vis DRS and BET. Activities of the prepared nano-photocatalysts were evaluated by decolorization of methyl orange solution under visible light. The performances of the prepared nano- photocatalysts and the commercial TiO2 catalyst （P25） in hydrogen production through water photodecomposition under UV irradiation were investigated. The results showed that TiO2 （ R ） with rod-like crystalline and TiO2 （A） with hexagon-like crystalline could be prepared with distilled water and anhydrous ethanol as reaction media, respectively. The light absorption of TiO2 （R） in the visible light region was stronger than that of P25 according to the UV-Vis DRS results. Under visible light irradiation for 6.0 h, decolorization ratio of methyl orange over TiO2 （R） was 72.7%, which was obviously higher than 47.8% of P25. Under UV irradiation, the hydrogen production rate of TiO2 （A） reached 24.2 μmol/h, slightly lower than 25.8 μ mol/h of P25.

关 键 词：二氧化钛光催化剂 光分解水 产氢 甲基橙脱色 

分 类 号：TQ426.64[化学工程]