【作者】 涂志斌；

【导师】 黄冬根；

【作者基本信息】 南昌大学 ， 环境工程， 2011， 硕士

【摘要】 二氧化钛因其价廉、对人体无毒性及其具有的光催化性能,今天越来越多的研究者开始深入对其的研究和探索,其应用也越来越广泛。但目前的Ti02的应用还有它的局限性,主要原因在于其形态的不足,目前研究制备的Ti02纳米级光催化剂主要有粉体和溶胶两种形态,这两种形态在应用上都不利于回收,本实验采用溶胶-凝胶法制备出颗粒的粒径在1-2mm的TiO2-γAl2O3微球并用其进行光催化反应降解废水中的2,4-二氯酚有机物,发现制备的该微球具有很高的光催化性能。在实验过程中,分别进行对比实验来研究pH、超声波时间、干燥蒸发水份的多少以及煅烧时的煅烧方法等各因素对制备出的微球的成球率的影响后确定最佳的一组制备工艺。试验中还设计了在不同的铝钛摩尔比、制备微球的煅烧温度和煅烧时间等条件因素下制备TiO2-γAl2O3微球光催化剂,并对2,4-二氯酚进行光催化降解反应,通过采用XRD对制备的微球进行表征,以及用高效液相色谱法对光催化降解后的2,4-二氯酚溶液进行浓度的测定,通过两种结果的对比后确定出一组最佳的制备TiO2-γAl2O3微球的最佳铝钛摩尔比、煅烧温度和煅烧时间等因素。本论文实验还采用均匀设计法来设计实验考虑光催化反应中的反应液中的C1-浓度、pH值、微球的浓度和2,4-二氯酚的浓度对TiO2-γAl2O3微球光催化降解氯酚的反应速率的影响,通过高效液相测定后用回归分析法分析数据后确定最佳的反应条件,综合上述的所有条件在最佳工艺条件下制备和进行光催化降解反应进行微球的重复使用实验,看TiO2-γAl2O3微球的重复使用率,并液质联用仪对光催化液进行测定分析其中间产物和降解机理。更多还原

【Abstract】 TiO2 is being increasingly researched and explored by researchers and implemented more widely, for its inexpensive, non-toxic to humans and photochemical catalysis. However, there are also some limitations of its implementation for its shape shortages. There are two shapes of TiO2 nanometer photocatalyst, powder and sol, are being researched and prepared nowadays, both of which are not conducive to recovery in implementation. The TiO2-γAl2O3 micro-balloons were prepared in this paper with the sol-gel method, whose grain diameter is between 1-2 mm. In a photocatalytic reactions degradation 2,4-DCP, we found it has high photocatalytic performance.During the experiment process, comparative experiments were carried out respectively to research the influences of such elements as pH, ultrasonic time, amount of water being dried and evaporated and calcinations methods, in granulation rate of micro-balloons being prepared. An optimum preparation technology was settled at last.The TiO2-γAl2O3 micro-balloon photochemical catalysis was prepared in this experiment with the different conditional factors such as Al-Ti molar ratio, calcination temperature of micro-balloon preparation and calcination time. And the photocatalytic degradation of 2,4-DCP was carried out. The solution concentration of 2,4-DCP had been photocatalytic degraded was measured by High Performance Liquid Chromatography, through representation of micro-balloon being prepared by XRD. By comparing the results, a set of factors including the best Al-Ti molar ratio of TiO2-γAl2O3 micro-balloon, calcination temperature and calcination time was defined.Uniform design method was also adopted in this paper to design experiments, considering the influence of Cl" concentration, pH, concentration of micro-balloon and 2,4-DCP concentration in the reaction solution of photocatalytic reaction on photocatalytic degradation rate of TiO2-γAl2O3 micro-balloon chlorophenol photocatalytic. The best reaction condition was confirmed by regression analysis method after determined by high performance liquid. All of the conditions above were synthesized in the best preparation technology process and reuse of micro-balloon in photocatalytic degradation, to watch the reuse rate of TiO2-γAl2O3 micro-balloon. Also the intermediate product and degradation mechanism of photochemical catalysis solution were measured and analyzed byHPLC-MS.更多还原