论文部分内容阅读
锐钛矿相TiO2的光催化活性高于金红石相。采用化学溶液分解法制备了Al掺杂锐钛矿TiO2,并用硝酸对其进行酸化处理。利用TG-DTA、XRD、FTIR、BET和UV-vis等手段对样品进行了表征,通过对甲基橙的降解分析了酸化处理对Al掺杂TiO2光催化活性的影响。结果表明:掺杂Al能有效抑制TiO2由锐钛矿向金红石转变。酸化处理因能增大Al掺杂TiO2的比表面积而使其光催化活性提高。Al/Ti掺杂比为1∶4的样品在酸化处理后具有的光催化活性最高,60min后对甲基橙的降解达到100%。
The photocatalytic activity of anatase TiO2 is higher than that of rutile. Al-doped anatase TiO2 was prepared by chemical solution decomposition and acidified with nitric acid. The samples were characterized by TG-DTA, XRD, FTIR, BET and UV-vis. The effect of acidification on the photocatalytic activity of Al-doped TiO2 was analyzed by degradation of methyl orange. The results show that the doping of Al can effectively inhibit the transformation of TiO2 from anatase to rutile. Acidification can increase the photocatalytic activity of Al-doped TiO2 due to its specific surface area. The sample with Al / Ti doping ratio of 1: 4 had the highest photocatalytic activity after acidification treatment, and the degradation of methyl orange reached 100% after 60 min.