(1. 浙江大學(xué) 工業(yè)生態(tài)與環(huán)境研究所，杭州 310027；
2. 浙江建設(shè)職業(yè)技術(shù)學(xué)院 城建系，杭州 311231)
摘 要: 采用電化學(xué)陽極氧化法，在純Ti表面一步制得原位生長的自組織TiO2納米管陣列。采用掃描電鏡(SEM)、X射線光電子能譜(XPS)、紫外−可見光漫反射吸收光譜(UV-vis DRS)對煅燒后樣品進(jìn)行表征，并探討納米管陣列的形成機(jī)理。結(jié)果表明，在優(yōu)化的制備參數(shù)條件下，所得TiO2納米管排列整齊，平均管徑約為150 nm, 平均管長約為400 nm，且對400~700 nm可見光有較大吸收。XPS分析發(fā)現(xiàn)，0.35%(摩爾分?jǐn)?shù))的F原子摻雜進(jìn)入TiO2晶格中。可見光催化降解染料AO7的結(jié)果表明，673 K煅燒的F-TiO2納米管對AO7的去除率達(dá)到37.2%。
關(guān)鍵字: TiO2納米管陣列；陽極氧化；形成機(jī)理；可見光
self-organized TiO2 nanotube arrays
（1. Institute of Industrial Ecology and Environment, Zhejiang University, Hangzhou 310027, China;
(2. Department of Urban Construction Engineering, Zhejiang College of Construction, Hangzhou 311231, China）
Abstract:Self-organized TiO2 nanotube arrays were fabricated by a one-step electrochemical anodization process on a Ti sheet. The prepared samples were annealed in air and detected by SEM, XPS and UV-vis DRS spectrophotometry. And the possible formation mechanism was presented. The results show that the well ordered TiO2 nanotube arrays with the average tube diameter of 150 nm and the average tube length of 400 nm were fabricated under optimized electrolyte and oxidation conditions. The TiO2 nanotubes exhibit strong absorption in visible-light region of 400−700 nm. The fluorine with an molar fraction of 0.35% is doped into TiO2 nanotubes, as evidenced by XPS. The removal efficiency of AO7 by the F-TiO2 nanotube arrays annealed at 673 K reaches 37.2 % under visible light irradiation.
Key words: TiO2 nanotube array; anodic oxidation; formation mechanism; visible light
