基于缺陷重构的类芬顿光催化剂在降解染料废水中的应用

近年来,通过缺陷调控提高催化剂催化性能引起了广泛关注,而缺陷重构过程对光催化-类芬顿耦合反应的影响仍鲜有研究.本文将含铁多酸分子强耦合到富含氧空位缺陷的二氧化钛(TiO_2)光催化剂(P25)表面,考察了缺陷形成和二次重构过程对光催化-类芬顿协同催化降解有机染料活性的影响.结果表明,单氰胺复合后二次煅烧有利于H2气氛处理生成的氧空位进行空间分布重构,重构后的缺陷更为有利于TiO_2表面的光生电荷向含铁多酸分子界面转移.借助TiO_2光催化剂光生电荷分离能力的提升和类芬顿试剂活性位点的增强,缺陷重构的类芬顿光催化剂在降解亚甲基蓝染料的反应中催化活性提高了13倍.

Application of Fenton-like Photocatalysts Based on Defect Reconstruction in Degradation of Dye Wastewater

In recent years, improving the performance of catalysts through defect modulation has attracted extensive attention. However, the impact of defect rearrangement on Fenton-like photocatalytic reactions has not been studied. In this study, Fe-containing polyoxometalate molecules were grafted onto the surface of defective TiO₂.The influence of oxygen vacancy formation and the defect arrangement process on the catalytic activity was investigated. The results indicated that the calcination of cyanamide modified defective TiO₂ is beneficial for the spatial reconstruction of oxygen vacancies generated by H₂ atmosphere treatment. With rearranged structural defects, photo-generated electrons were prone to transfer from the surface of P25 to Fe-POM nanoparticles. Due to the enhanced charge separation in TiO₂ and the increased reactive sites on the Fenton-like reagent, Fenton-like photocatalysts with rearranged defects showed a 13-fold increase in catalytic activity during the degradation of dye molecules.