两步阳极氧化制备TiO_2纳米管的光电催化产氢性能研究  

Study on photoelectrocatalytic hydrogen generation performance of TiO_2 nanotubes made by two-step anodization

作　　者：李运林[1] 张超[1] 周蕾[1] 周明华[1] 

机构地区：[1]南开大学环境科学与工程学院环境污染过程与基准教育部重点实验室天津市城市生态环境修复与污染防治重点实验室,天津300071

出　　处：《水资源与水工程学报》2013年第1期64-68,共5页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(51178225;21273120);教育部博士点基金项目(20110031110025);天津市自然科学基金项目(09JCYBJC08000)

摘　　要：利用两步电化学阳极氧化法制备了TiO2纳米管(TNT),并比较了其与一步阳极氧化法制备的TNT形貌特征和光电催化活性。结果表明:两步氧化法制得的TNT较一步阳极氧化法制得的TNT形貌有较大的差异,两步氧化后TNT平均管长和管径略有增加,分别达到7.67μm和72.12 nm,而管壁厚度则减少到16.36 nm,这导致长径比从59.73显著增加到104.83。相应地,其光-氢转化效率也从0.14%显著增加到0.36%。而目标污染物乙二醇的存在进一步提升了TNT的光电催化降解污染物同时产氢的活性。因此,两步阳极氧化法是一种简单有效改善TNT结构特征和光电催化性能的有效方法,在光电催化降解污水中的有机污染物同时产氢方面有应用前景。Titania nanotube was prepared by two-step anodization process,and compared morphology features and photoelectrocatalytic activity of TNT fabricated by one-step anodization process.The results suggested that TNT fabricated by two-step anodization processes exhibited bigger difference in morphology features in comparison with TNT prepared by one-step anodization process.The average tube length and diameter of TNT fabricated by two-step anodization processes displayed a little increase than those of TNT fabricated by one-step anodization process,and were 7.67 μm and 72.12 nm respectively.The wall thickness decreased to 16.36 nm,which resulted in increase of aspect ratio from 59.73 to 104.83.Correspondingly,the photon-to-hydrogen conversion efficiency significantly increased from 0.14% to 0.36%.Moreover,the presence of ethylene glycol as target pollutant further enhanced the photoelectrocatalytic activity of pollutant degradation and hydrogen generation of TNT.Thus,two-step anodization processes is a simple and effective method to improve the morphology features and photoelectrocatalytic performance of TNT and have an application prospect in photoelectrocatalytic degradation of organic pollutants and simultaneous hydrogen generation.

关 键 词：二氧化钛纳米管 光-氢转化效率 光电催化 有机污染物 产氢 

分 类 号：X703.1[环境科学与工程—环境工程] O644[理学—物理化学]