中文摘要：

结合强吸附能力与高光催化活性的催化剂有望更有效地除去废水中的污染物.以Degussa P25二氧化钛为原料,采用水热法制备了二氧化钛纳米管（简称为TNTs）,将TNTs加入到溶有氯铂酸和柠檬酸（还原剂）的无水乙醇中,在蒸汽相水解装置中通过一步法制备了Pt负载型二氧化钛纳米管/纳米晶复合光催化剂.蒸汽相处理过程中,部分纳米管转变为锐钛矿相TiO2,仍有部分以管的形式存在,使纳米复合物保留了较高的吸附能力.利用X射线衍射（XRD）、透射电子显微镜（TEM）、比表面及孔隙度分析仪等方法对产物进行了表征.结果表明,粒径约为4 nm的金属性Pt较好地分散在TNTs及由纳米管转变而来、晶粒尺寸约为8 nm的锐钛矿相TiO2晶粒表面,复合物保留了高于216 m2/g的比表面积.光催化降解染料酸性红及亚甲基蓝的实验结果表明,纯管有较好的吸附能力,但是光催化性能非常低,经120℃蒸气处理并负载贵金属Pt后光催化活性有了显著的提高.

英文摘要：

The composite photocatalysts combining high adsorptive capacity with enhanced photocatalytic effi-ciency are expected to be more efficient catalysts for the pollutant removal in the wastewater.TiO2 nanotubes（TNTs） were synthesized via hydrothermal method using Degussa P25 titania as raw material.The Pt-loaded TiO2 nanotubes/nanocrystals composite photocatalysts（Pt/TNNs） were prepared via one-step synthesis method involved the vapor phase hydrolysis setup,where TNTs were added into the ethanol solution containing chloro-platinic acid and citric acid（as the reductant）.During the water vapor treatment,some of the nanotubes were transformed into anatase TiO2 nanocrystals and a small amount of TNTs were kept as the tubular morphologies,thus the composite had a higher adsorptive capacity.The as-prepared samples were characterized by X-ray dif-fraction,transmission electron microscope and N2 isothermal adsorption-desorption.Results showed that the Pt nanoparticles with crystallite size of 4 nm were uniformly dispersed onto the surface of remaining TNTs and anatase TiO2 nanocrystals with crystallite size of 8 nm derived from the transformation of TNTs,and the com-748 posite photocatalysts kept a specific surface area of more than 216 m2/g.The photocatalytic activity of Pt/TNNs was evaluated by the degradation rate of acid red G（ARG） and methylene blue（MB） under UV irradiation.The results showed that the pristine TNTs had good adsorptive ability but very poor photocatalytic activity.After loading with Pt nanocrystals,Pt/TNNs obtained via water vapor treatment at 120℃ exhibited much higher photocatalytic efficiency compared with the pristine TNTs.