中文摘要：

研究了用溶胶凝胶法制备锐钛矿型Ti O_2光催化剂并使用La^3＋、Si^4＋等阳离子进行掺杂改性。XRD图谱表明,在550℃下煅烧2 h可以得到晶形较为完整的锐钛矿Ti O_2并且掺杂改性后,晶粒大小呈现出明显的细化。同时,以罗丹明B为目标降解物,考察了Ti O_2光催化性能并以此来表征其抗菌能力。结果表明,La^3＋、Si^4＋掺杂改性后的Ti O_2具有较好的光催化性能;对于不同浓度的阴离子对光催化性能的影响,发现硫酸根（氯）离子团促进（抑制）了光催化反应,而硝酸根离子则无明显影响。且随着阴离子浓度的降低,影响作用也相应减小。最后,利用浸渍提拉法在瓷砖表面制备了Ti O_2薄膜,以光催化降解罗丹明B作为评价其抗菌性能指标,发现其仍保持有好的光催化性能。

英文摘要：

Sol-gel method was adopted to prepare anatase-Ti O_2 photocatalyst and the anatase-Ti O_2 was doped with La~（3＋） or Si~（4＋） ion. XRD patterns indicate that the perfect crystal of anatase Ti O_2 was obtained after calcining the sample at 550 ℃ for 2 h. With La~（3＋） or Si~（4＋） ion doping, the Ti O_2 grains were obviously refined. Using Rhodamine B（Rh-B） as the model pollutant, the photocatalytic properties of Ti O_2 were studied to characterize its antimicrobial ability and the experimental results show that the La~（3＋） or Si~（4＋） doped Ti O_2 has a good photocatalytic property. The influence of anion with different concentrations on the photocatalytic properties indicates that SO42-（Cl-） accelerates（restrains） the reaction while NO3- has no obvious influence on the reaction. As the decrease of anion concentration, the relative influence was also reduced. Finally, the Ti O_2 films were produced on the tiles by the dipping method. Using Photocatalytic degradation of the Rh-B as the evaluation indicator of antimicrobial properties shows its good photocatalytic performance.