纳米TiO_2/Ti管阵列薄膜催化剂的制备和性能  

Preparation and Catalytic Performance of TiO_2 Nanotubes by Anodization of Titanium

作　　者：吴钧[1] 施利毅[1,2] 袁帅[1] 陈怡[1] 张雨[1] 

机构地区：[1]上海大学纳米中心,上海200444 [2]上海大学理学院,上海200444

出　　处：《化学反应工程与工艺》2008年第2期147-152,共6页Chemical Reaction Engineering and Technology

基　　金：上海市教育委员会科研创新项目(06AZ077;08YZ09);上海市科委技术创新人才团队建设专项项目(06DZ05902);上海市教委第五期重点学科(J50102);上海-联合利华研究与发展基金(06SU07001 )

摘　　要：采用阳极氧化法制备纳米TiO_2/Ti管阵列薄膜催化剂,考察了外加电压、反应时间和电解液pH值对催化剂形貌的影响。结果表明,在外加电压20 V,pH值为4.5～5.0,反应6 h的条件下,制得的TiO_2管阵列薄膜催化剂管孔形貌清晰、整体分布均匀,管长约为1.8μm,管径约为90 nm。在400℃煅烧2 h后,由无定型转化为单一的锐钛矿型,阵列结构没有崩塌和损毁。在400℃煅烧后的纳米TiO_2/Ti管阵列薄膜催化剂具有良好的光催化活性,可与光电协同催化用于降解亚甲基蓝,光催化和光电协同催化降解的降解率分别为21.30%和77.96%。TiO2 nanotube arrays thin membrane catalysts were prepared by anodization of titanium in KF/Na2SO4 mixture electrolyte. The effects of anodic potential, anodic oxidation time and electrolyte pH on tube-structure were investigated by scanning electron microscopy （SEM）. The results showed that the TiO2 nanotube arrays thin membrane catalysts with pore lenghth about 1.8 μm and pore diameter about 90 nm prepared under the optimal conditions of 20 V, pH4.5--5.0 and reaction time 6 h had clear pore appearance and even pore distribution. After calcined for 2 hours at 400 ℃, the amorphous nanotube wails of the catalysts converted to anatase phase and the structure of TiO2 nanotube arrays was kept well without any distortion and collapse. The TiO2 nanotube arrays material was used as photocatalyst to degrade methylene blue solution under ultra-violet light irradiation and ultra-violet light-electric field respectively, the degradation of the photocatalysis and photoelectric catalysis were 21.30% and 77.96% respectively.

关 键 词：阳极氧化 纳米二氧化钛管阵列 光电协同 亚甲基蓝 

分 类 号：TQ426.6[化学工程] TQ426.8