【作者】 周智；

【导师】 李志光； 杨建奎；

【作者基本信息】 湖南农业大学 ， 应用化学， 2008， 硕士

【摘要】 本论文采用UV/纳米TiO₂/O₃协同作用对城市有机废水进行处理。分别采用溶胶法、溶胶-凝胶法、水解法制备纳米二氧化钛,共制备六组不同的纳米二氧化钛样品。然后将纳米二氧化钛样品作为催化剂与臭氧协同作用降解甲基橙,通过甲基橙的降解效果来表征纳米二氧化钛的催化性能,采用热重-差热分析仪、激光粒度分析仪、扫描电子显微镜和X射线衍射分析仪进行表征。确定催化性能最好的纳米二氧化钛和臭氧协同作用,用于降解甲基橙、十六烷基苯磺酸钠、蛋白质、油脂。得到如下结论:纳米二氧化钛与臭氧协同作用降解甲基橙的反应中,采用溶胶法制备的样品Ⅰ降解甲基橙时表现出最好的催化效果,30分钟的降解率高达到95%;差热-热重分析、粒度分析、扫描电镜和X射线衍射结果显示:样品Ⅰ具有较高的分散度和化学纯度,平均粒径为40～50nm。UV/纳米TiO₂/O₃协同作用降解甲基橙的初步实验显示协同作用的最佳反应条件为:时间为30分钟,催化剂添加量为1g/L,溶液的pH为3,光照强度为60W;催化剂的热处理温度为500℃;在20℃～40℃范围内温度对的降解率的影响不大。动力学研究结果显示:初始浓度越大,完全光催化降解时的反应时间越长,其光催化反应符合拟一级动力学方程。UV/纳米TiO₂/O₃协同作用降解十六烷基苯磺酸钠、蛋白质和油脂的实验显示:协同作用降解十六烷基苯磺酸钠13h的降解率82.1%,对蛋白质协同120 min的降解率为52.1%,油脂24h的降解率为65.1%。正交实验结果表明协同作用的最优工艺条件分别为:SDBS,催化剂的添加量为1.0 g/L,光照时间为15min,pH值为3;蛋白质,催化剂的添加量为1.0g/L,光照时间为120min,pH值为7;油脂,催化剂的添加量为1.5g/L,光照时间为5min,pH值为11。更多还原

【Abstract】 This paper was studied the process of the organic wastewater degradation by the way of nanometer titanium dioxide synergism with ozone and UV.We used three methods include the way of sol,the sol-gel and the hydrolyze way to prepare five group of different nanometer titanium dioxide samples.And then the samples will be used in the degeneration of methyl orange as the catalyst synergism with ozone to find the best catalyst sample through their catalyzed performance,which will be characterize by the means of the TG-DTA,the laser granularity analyzer,the scanning electronic microscope and the X-ray diffraction.Finally,the best catalyst will work together with ozone in the degeneration of the methyl orange,the sodium dodecyl benzene sulfonate(SDBS),the protein and the fat.Obtains the following conclusion:The best catalyst sampleⅠwas prepares by the way of sal.The degradation efficiency has reached as high as 95%in the 30min on the reaction of methyl orange degradation.The sizing test,the scanning electron microscope and the X-ray diffraction result showed:SampleⅠhas the good dispersion degree,the high chemistry purity,the average grain diameter is 40～50nm.In the synergism of methyl orange degeneration,the best reaction conditions of synergism is that:the reaction time is 30min,the catalyst recruitment is 1g/L,the pH value of the solution is 3,the strength of UV lamp is 60W,the heat treatment temperature of catalyst is 500℃,the influence of the methyl orange degeneration by the temperature not as much as other conditions on the 20℃～40℃.Dynamics findings showed:when the initial density bigger,the time of photochemical catalysis complete degeneration’s reaction time longer,the photochemical action corresponded to the first-level dynamic equation.In the synergism of the SDBS,the protein,the fat degeneration,the synergism is more efficient than affects alone.After 13h synergism,the degradation efficiency of SDBS has reached as high as 82.1%,the degradation efficiency of protein is 52.1% after 120min synergism and for the fat is 52.1%after 24h.The result of orthogonal experimental indicated that the most superior technological conditions respectively of the synergism are that:for SDBS,the catalyst recruitment is 1.0 g/L,the illumination time is the 15min,pH value is 3;The protein,the catalyst recruitment is 1.0 g/L,the illumination time is 120min,pH value is 7;The fat,the catalyst recruitment is 1.5 g/L, the illumination time is the 5min,pH value is 11.更多还原