Catalysis Letters ( IF 2.8 ) Pub Date : 2021-05-14 , DOI: 10.1007/s10562-021-03634-4 Ju Li , Bingxian Chu , Zhen Xie , Yaqian Deng , Yumin Zhou , Lihui Dong , Bin Li , Zhengjun Chen
In order to improve the current environmental pollution caused by discarded pesticide packages in rural areas, and raise awareness of agricultural ecological environmental protection. Rare earth ions (RE3+ = Ce3+, Sm3+, Pr3+, La3+) doped titanium dioxide (TiO2) catalysts were prepared by sol-hydrothermal method and characterized by XRD, SEM, TEM, XPS, BET, UV–vis DRS, PL, EPR, and density functional theory (DFT) calculations. The characterization results showed that the doped rare earth ions replace Ti4+ into the titania lattice. The activity of the RE3+-doped TiO2 photocatalyst was evaluated by degrading methyl orange (MO) and mixed pesticides (also containing pirimicarb, fenthiophos, triadimefon and deltamethrin) under ultraviolet light. Compared with pure TiO2, RE3+-doped TiO2 has significantly improved photocatalytic activity for the degradation of MO and carbamate pesticides. The degradation rate of Sm-TiO2 sample to degrade MO reached 100% within 60 min, and the degradation rate of degrading aphicarb, fenthion, triadimefon and deltamethrin reached more than 90% within 180 min. Sm-TiO2 is the best catalyst. This can be attributed to a synergistic effect of the doping of Sm3+ introduces impurity energy levels and a large number of oxygen vacancies (OVs), which can more effectively capture photogenerated electrons and reduce the recombination rate of photogenerated electrons-holes. In this study, the sol-hydrothermal method was used to develop a high-efficiency catalyst for simultaneous photocatalytic degradation of various organic pollutants in aqueous solutions.
Graphic Abstract
中文翻译:
溶胶-水热合成制备稀土离子掺杂TiO 2光催化剂上有机污染物的降解机理及DFT研究
为了改善目前农村抛弃农药包装造成的环境污染,提高对农业生态环境保护的认识。采用溶胶-水热法制备了稀土离子(RE 3+ = Ce 3+,Sm 3+,Pr 3+,La 3+)掺杂的二氧化钛(TiO 2)催化剂,并通过XRD,SEM,TEM,XPS, BET,UV-vis DRS,PL,EPR和密度泛函理论(DFT)计算。表征结果表明,掺杂的稀土离子将Ti 4+置换为二氧化钛晶格。RE 3+掺杂的TiO 2的活性通过在紫外线下降解甲基橙(MO)和混合农药(也包含吡虫威,苯硫磷,三唑酮和溴氰菊酯)来评估光催化剂。与纯TiO 2相比,掺有RE 3+的TiO 2具有显着改善的光催化活性,可降解MO和氨基甲酸酯农药。Sm-TiO 2样品在60 min内降解MO的降解率达到100%,而在180 min内降解蚜虫威,倍硫磷,三唑酮和溴氰菊酯的降解率达到90%以上。Sm-TiO 2是最好的催化剂。这可以归因于掺杂Sm 3+的协同效应。引入杂质能级和大量的氧空位(OVs),可以更有效地捕获光生电子,并降低光生电子-空穴的复合率。在这项研究中,使用溶胶-水热法开发了一种高效催化剂,用于同时光催化降解水溶液中的各种有机污染物。