TiO_2纳米管的离子交换改性及光催化去除水中四环素的研究  

Ion-exchange modification of TiO_2 nanotubes and visible-light-driven photocatalytic degradation of tetracycline

作　　者：卢昶雨[1] 关卫省[1] 彭悦欣 李娇[1,2] 郑佩[1] 

机构地区：[1]长安大学环境科学与工程学院,西安710064 [2]西安市市政设施管理局,西安710016

出　　处：《北京化工大学学报（自然科学版）》2015年第1期81-86,共6页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：高等学校博士点专项科研基金(20110205110014);国家大学生创新创业训练计划项目(201310710055);长安大学博士生助研科技项目(2014G5290009);长安大学中央高校科研项目(2014G329207)

摘　　要：以TiO2粉末为前驱体,采用水热法制备得到未改性和Co2＋改性的TiO2纳米管,使用SEM、TEM、XRD、XPS、BET和UV-Vis等测试技术对样品进行了表征。以氙灯（250~800 nm）为光源、四环素为降解对象,测试样品在模拟日光下的光催化降解抗生素性能。研究表明：TiO2粉末经水热反应后,转化为中空、开口的TiO2纳米管,纳米管分布均匀且分散性良好;生成的TiO2纳米管为纤铁矿型,Co2＋交换改性会对TiO2纳米管的微观形貌和晶型结构产生些许影响。制得的TiO2纳米管,其N2吸附-脱附等温线为典型的IUPAC IV型等温线。与TiO2粉末和未改性TiO2纳米管相比,Co2＋交换改性的TiO2纳米管具有较好的光吸收能力,在氙灯光源下反应90 min,其对四环素的降解率可达71.5%。Ion-exchange modified TiO2 nanotubes have been prepared and their photocatalytic performance in the light-driven degradation of tetracycline has been studied. The materials were characterized by SEM,TEM,XRD,XPS,BET and UV-Vis spectroscopy. Photocatalytic degradation of antibiotics using visible light and a xenon lamp（ λ = 250-800 nm） have also been carried out on using the catalysts. The results show that it is possible to fabricate regular uniform nanotubes through a hydrothermal process,and endow them with homogeneous multi-walled tubular structures with open ends. The XRD results showed that TiO2 powder was completely transformed into TiO2 nanotubes,and no anatase or rutile phase was present in the product. In terms of the morphology and structure,there was little difference between Co2 ＋ion exchanged TiO2 nanotubes and unmodified TiO2 nanotubes. The nitrogen adsorption-desorption isotherms showed a typical IV adsorption isotherm characteristic of mesoporous materials.Comparison of the UV-Vis spectra of the TiO2 nanotubes and TiO2 powder shows that the nanotubes have increased absorbance,since the absorption edge is extended into the visible light region. In the photocatalytic degradation of tetracycline with Co2 ＋ion exchanged TiO2,the degradation ratio reaches 71. 54% in 90 min under irradiation by the xenon lamp.

关 键 词：TIO2纳米管 离子交换改性 光催化 四环素 

分 类 号：X13[环境科学与工程—环境科学] O643.32[理学—物理化学]