Ce掺杂的锐钛矿型纳米介孔TiO_2(Ce-MTiO_2)的制备及其光催化降解活性研究

Preparation of Cerium Doped Nano Mesoporous Titania(Ce-MTiO_2) with Anatase Crystalline Structure and Research on Its Photocatalytic Degradation Activities

采用模板技术通过直接掺杂的方式合成了稀土元素Ce掺杂的锐钛矿型纳米介孔TiO2。在500 W高压汞灯照射下,研究了低浓度有机磷农药敌敌畏、氧化乐果的光催化降解,研究结果表明,该催化剂具有很高的光催化活性和稳定性,且能够重复使用。对催化剂的N2吸附、XRD、UV-Vis、FT-IR表征结果表明,该材料为高度有序、高比表面积的纯锐钛矿晶型的介孔二氧化钛材料(Ce-MTiO2)。该催化剂具有很高的光催化活性可能与稀土元素Ce的电子结构、锐钛矿纳米晶、介孔结构和高比表面积有密切关系。

Cerium doped nano mesoporous titania （Ce-MTiOe） with anatase crystalline structure was prepared by template method. The photocatalytic degradation of the two organophosphorus pesticides （dichlorvos, omethoate） was studied over the Ce-MTiO2 using high pressure mercury lamp （500 W） as light resource. The catalyst showed ex- cellent catalytic activities snd reusability. The structures of the catalyst were characterized by nitrogen adsorption, XRD, UV--Vis and FT-IR. The characterization results indicated that the catalyst exhibited highly ordered mesoporous structure and high specific surface area. The enhanced photoeatalytic activity of the catalyst may he attributed to the synergistic effects of cerium property, anatase nanocrystal, mesoporous channels and high specific surface area.