【作者】 张小丽；

【导师】 涂铭旌；

【作者基本信息】 四川大学 ， 材料学， 2006， 硕士

【摘要】 TiO2光催化剂在光催化处理水、空气中的有机、无机污染物,抗菌、防霉等方面显示了巨大的潜在应用前景。本文通过稀土铈掺杂和贵金属银沉积方式对纳米二氧化钛进行改性,研究了改性后纳米二氧化钛复合粉体的光催化性能和抗菌性能。在光催化性能研究部分:考察了锐钛型纳米二氧化钛载Ce工艺参数,研究了铈掺杂浓度、焙烧温度等对二氧化钛光催化降解甲基橙的性能影响,以及铈掺杂的纳米二氧化钛复合粉体对甲醛气体的降解效果。抗菌性能研究部分:考察了分散介质、分散剂的浓度、银离子初始浓度、pH值等对银离子吸附效率的影响规律,并考察了不同银离子掺杂浓度的金红石二氧化钛复合粉体的抗菌性能、抗变色性能等。实验中利用Zeta电位测试仪,X射线衍射仪(XRD),紫外-可见分光光度计(UV-Vis),红外光谱测试仪(IR)等系列的分析手段对样品进行了表征。锐钛型纳米二氧化钛粉体对铈离子吸附量的检测结果表明,纳米二氧化钛对铈离子的吸附非常显著。UV-Vis漫反射光谱测试结果显示,与纯二氧化钛相比,铈掺杂的纳米二氧化钛粉体的吸收边界向长波方向偏移。IR、XRD图谱测试结果表明,焙烧以后,铈离子进入纳米TiO2的骨架,并有部分铈以氧化物的形式存在于复合粉体表面。光催化降解甲基橙效果表明,铈的掺杂明显提高二氧化钛的光催化性能,并且在较低铈掺杂量下,较高的焙烧温度下降解效果较好;在较高铈掺杂量下,较低的焙烧温度降解效果较好。铈掺杂的二氧化钛复合粉体在日光灯照射下24h后对甲醛的降解率可达49.47%。银掺杂锐钛型二氧化钛的实验结果表明:0.2%的六聚偏磷酸钠溶液对锐钛型纳米二氧化钛的分散效果最佳;银掺杂锐钛型纳米二氧化钛的最佳制备工更多还原

【Abstract】 Nano-titanium dioxide photocatalysts shows tremendous latency appliance foreground in the application fields, such as waste water cleanse, air purification and remediation, antibacterial etc. In this article, according to lanthanide ion dopant and noble metal Ag sediment for modified nano-TiO2, we have studied photocatalytic and antibacterial activity of modified nano-TiO2 composite powder. In the experiment of photodegradation, adsorption efficiency of Ce+ on the surface of anatase TiO2(A-TiO2), the photocatalytic activity of Ce content at different heat treatment temperature were investigated for photodegradation of methyl orange (MO) in nano-powder suspension irradiated by middle-pressure mercury lamp, and scrutinized degradation results of Ce/TiO2 compound material for formaldehyde. In the experiment of anti-microbial, we systemically studied the influence of dispersing medium, dispersant content, concentration of silver ion, and pH value on adsorption efficiency of Ag+, and researched anti-color degradation and antibacterial activity of different silver ion- modified Rutile-TiO2(R-TiO2). The samples were characterized by Transmission electron microscope (TEM), X-ray diffraction (XRD) and UV-Vis optical property analysis etc.The results showed that the adsorption rate of nano-anatase TiO2 was very high and the cerium ions were almost adsorbed. UV-Vis spectroscopy indicated that compared with undopd TiO2, the absorption edge of Ce-doped TiO2 were seen to shift to the long-wavelength region (named red shift); XRD and IR showed after更多还原