不同金属离子掺杂TiO_2薄膜的制备及光催化活性的研究  

Preparation and photocatalytic properties of TiO_2 thin films doped with various metal ions

作　　者：刘超[1] 杨良准[1] 杜立芬[1] 余锡宾[1] 吴振华[1] 

机构地区：[1]上海师范大学生命与环境科学学院,上海200234

出　　处：《工业催化》2006年第1期56-60,共5页Industrial Catalysis

基　　金：上海科技发展基金资助项目(04JC14089和0452nm070)

摘　　要：以溶胶-凝胶法制备了分别用Ag+、Cu2+、Fe3+、La3+、Ce3+和Eu3+等离子掺杂的纳米TiO2薄膜,经XRD和UV-Vis对薄膜样品进行表征并研究了其光催化活性。XRD结果证明,掺镧TiO2薄膜与未掺杂薄膜的X射线衍射图基本一致,实验条件下主要为锐钛矿型,且掺入La3+离子使得TiO2薄膜的晶粒变小。UV-Vis吸收光谱说明当λ>380 nm时,其吸光度低于0.15。薄膜光催化降解亚甲基蓝的实验表明,La3+或Fe3+掺杂薄膜的光催化降解率远高于未掺杂TiO2薄膜,而Ce3+或Cu2+离子掺杂薄膜与未掺杂薄膜的光催化活性相似,掺Ag+或Eu3+离子则降低了活性。当最佳掺杂量La3+为0.6%或Fe3+为1.5%时,光催化降解率分别高达92%和82%。Nanocrystalline titania （TiO2） thin films doped respectively with Ag^ ＋ , Cu62＋ , Fe3^＋ , La3^＋ , Ce3^＋ and Eu3^＋ were prepared by sol-gel method and characterized by means of XRD and UV-Vis. Activity of the as-prepared photocatalysts was tested. No much difference was observed between La3^＋-doped TiO2 thin films and non-doped TiO2 thin films, with crystalline structure of anatase; doping of La3^＋ reduced particle diameter of TiO2 thin films. UV-Vis results showed that absorbence of the thin films is less than 0.1 when λ〉380 nm. Photocatalytic degradation of methylene blue over titania thin films showed that photocatalytic degradation rate over La3^＋ - or Fe3^＋ -doped thin films was much higher than non-doped titania thin films; photocatalytic activity of Ce3^＋ -or Cu2^＋ -doped titania thin films is similar to that of non-doped titania thin films; activity of the Ag^＋- or Eu3^＋ -doped titania thin films was lower than non-doped titania thin films. Optimum amount of doped La3^＋ and Fe3^＋ was 0.6% and 1.5 %, with photocatalytic degradation rate of 92 % and 82 %, respectively.

关 键 词：离子掺杂 TIO2薄膜 光催化 亚甲基蓝降解 

分 类 号：TQ034[化学工程] TB383[一般工业技术—材料科学与工程]