钛上阳极氧化生成TiO2光催化薄膜的结构与性能

Characteristics of Photo-Catalytic Nano Crystalline TiO2 Film Prepared by Electrochemical Oxidation on Titanium

摘要:

研究了电化学阳极氧化在钛上制备的纳米晶多孔TiO2光催化薄膜的结构与光催化特性。将工业纯钛片或钛箔暴露于电介质溶液并加一定电压，钛表面将氧化生长多孔TiO2薄膜。适当控制氧化电压、溶液温度，得到非晶氧化膜，再进行晶化处理，得到锐钛矿相纳米晶TiO2薄膜。其晶粒尺寸约在10nm～30nm。用SEM，TEM，XRD表征TiO2薄膜的形貌与相结构。用光谱仪测定了薄膜对入射光的吸收特性，表明电化学氧化制备的纳米晶二氧化钛薄膜对近紫外入射光产生强烈的吸收，显示纳米结构的量子效应。测定了薄膜对酸性红溶液的光催化降解效率，结果表明反应30min后薄膜对酸性红的光催化降解率可达95％以上。

Abstract:

Photo-catalytic nano titanium dioxide film has been prepared by electrochemical oxidation process. The microstructure and grain morphology in the film are characterized by TEM and XRD. The photo absorption character of the film is measured using spectrometer. It shows that porous amorphous titanium dioxide films are formed by the electrochemical oxidation process in the dielectric solution at an applied voltage and temperature. The amorphous film transforms into nano crystallized titanium dioxide film with anatase structure by means of heat treatment. The oxidation current density decrease with time increase at the voltage of 0~80 V in logarithm law. The grain size in the film is about 20 nm~40 nm. The film has high photo catalytic activity as demonstrated by the degradation test of acid red B in dye solution.