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采用超声辅助的溶胶-凝胶(Sol-Gel)法制备了以β-分子筛为载体,Pr和H_3PMo_(12)O_(40)(PMo_(12))改性的多组分TiO_2光催化剂(ZPM-TiO_2),以X射线衍射(XRD)、X射线光电子能谱(XPS)、N_2-吸附脱附(BET,BJH)、透射电子显微镜(TEM)、紫外-可见光吸收光谱(UV-vis)等手段对催化剂的晶型结构、元素组成、形貌和光吸收特性等性能进行表征和分析。并且选择亚甲基蓝(MB)作为降解对象分别考察了ZPM-TiO_2的紫外和可见光催化活性。实验结果表明:与ZP-TiO_2和ZM-TiO_2相比,ZPM-TiO_2表现出优异的紫外和可见光光催化性能,主要是由于PMo_(12)和Pr的加入可以有效抑制光生电子空穴对的复合,从而提高其光催化活性。催化剂循环使用实验表明,ZPM-TiO_2经5次重复使用后,MB的降解率仍可达85%,ZPM-TiO_2具有较好的循环使用稳定性。
The multi-component TiO_2 photocatalysts modified by Pr and H_3PMo_ (12) O_ (40) (PMo_ (12)) were prepared by sol-gel method using ultrasound-assisted method. -TiO_2) were synthesized and characterized by XRD, XPS, BET, BJH, UV-Vis, etc. Means were used to characterize and analyze the crystal structure, elemental composition, morphology and optical absorption properties of the catalyst. And methylene blue (MB) was selected as the degradation target to investigate the UV and visible light catalytic activity of ZPM-TiO 2. The experimental results show that ZPM-TiO 2 exhibits excellent UV and visible light photocatalytic activity compared with ZP-TiO 2 and ZM-TiO 2, mainly because the addition of PMo 12 and Pr can effectively inhibit the recombination of photogenerated electron-hole pairs , Thereby increasing its photocatalytic activity. The experiments of catalyst recycling showed that the degradation rate of MB reached 85% after 5 times of repeated use of ZPM-TiO 2, and ZPM-TiO 2 had good stability of recycling.