TiO_2纳米管阵列薄膜光电催化降解甲基橙染料废水  

Photoelectrocatalytic Degradation of Methyl Orange in Aqueous Solution over TiO_2 Nanotubes Array

作　　者：周凝[1] 薛建军[1] 王玲[1] 凌世盛[1] 蔡燕华[1] 钱佳燕[1] 黄明喜[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210006

出　　处：《材料导报》2011年第16期75-78,共4页Materials Reports

基　　金："十一五"国家科技支撑计划项目(2006BAD04A12)

摘　　要：采用电化学阳极氧化法在纯钛表面制备出TiO2纳米管阵列,应用FE-SEM和XRD表征其形貌。以该纳米管陈列薄膜为光阳极,比较了光解、光催化和光电催化对甲基橙溶液降解效率的差异,研究了pH值和外加偏压对甲基橙降解效率的影响,并建立了光电催化氧化反应的一级动力学模型来描述产生这种效果的主要因素。结果表明,在光电催化氧化体系中,TiO2纳米管阵列薄膜对甲基橙具有显著的降解作用;溶液中的电解质、溶液的pH值和外加偏压是影响光电催化效果的关键因素;最佳的降解条件为电解质存在下、pH值为3、外加偏压为1.5V,在该条件下紫外灯照射80min后降解率可达100%。The photoelectrocatalytic degradation of a model textile dye, methyl orange（MO）, using titanium dioxide（TiO2 ） nanotubes array mesh as photocatalyst was investigated. TiO2 nanotubes array mesh was prepared by electrochemical anodization technique, and was characterized by X-ray diffraction and FE-SEM microscopy. The differences between the photoiysis and photocatalysis as well as photo-elect-catalysis, and the effects of pH, external bias were examined. The first-order kinetic model was applied to describe the photoelectrocatalytic（PEC） oxidation as well. It was found that the optimum conditions were pH=3, bias 1.5V in the PEC system, the degration rate can reach 100% after 80min later, in this condition. This investigation showed that PEC oxidation was a convenient way to mineralise the organic matters with high effciency.

关 键 词：TiO2纳米管阵列薄膜 光电催化降解 甲基橙 动力学 

分 类 号：O643[理学—物理化学]