Bao Ruiyu, Zhao Yue, Chen Chen, Cui Mengmeng, Yang Ling, Xia Jianxin, Li Hua
Key Laboratory of Ecology and Environment in Minority Areas (Minzu University of China), National Ethnic Affairs Commission Beijing 100081 China
College of Life and Environmental Sciences, Minzu University of China Beijing 100081 China.
RSC Adv. 2023 Jun 13;13(26):17959-17967. doi: 10.1039/d3ra03098a. eCollection 2023 Jun 9.
Visible-light-active 3D-TNAs@Ti-MOFs composite electrodes were fabricated by decorating nanoscaled Ti-based metal-organic frameworks on three-dimensional TiO nanotube arrays (3D-TNAs) prepared by a facile solvothermal method. The photoelectrocatalytic performance of electrode materials was evaluated by degradation of tetracycline (TC) under visible light irradiation. The experiment results show that Ti-MOFs nanoparticles are highly distributed on the top and side walls of TiO nanotubes. The 3D-TNAs@NH-MIL-125 solvothermally synthesized for 30 h exhibited the best photoelectrochemical performance compared with 3D-TNAs@MIL-125 and pristine 3D-TNAs. In order to further enhance the degradation efficiency of TC by 3D-TNAs@NH-MIL-125, a photoelectro-Fenton (PEF) system was constructed. The influence of HO concentration, solution pH and applied bias potential on TC degradation were explored. The results showed that when pH was 5.5, HO concentration was 30 mM, and applied bias was 0.7 V, the degradation rate of TC was 24% higher than the pure photoelectrocatalytic degradation process. The enhanced photoelectro-Fenton performance of 3D-TNAs@NH-MIL-125 could be attributed to the large specific surface area, excellent light utilization, efficient interfacial charge transfer, low electron-hole recombination rate and high production of ˙OH as the result of the synergistic effect between TiO nanotubes and NH-MIL-125.
通过在采用简便溶剂热法制备的三维TiO纳米管阵列（3D-TNAs）上修饰纳米级钛基金属有机框架，制备了可见光活性的3D-TNAs@Ti-MOFs复合电极。通过在可见光照射下降解四环素（TC）来评估电极材料的光电催化性能。实验结果表明，Ti-MOFs纳米颗粒高度分布在TiO纳米管的顶部和侧壁上。与3D-TNAs@MIL-125和原始3D-TNAs相比，溶剂热合成30小时的3D-TNAs@NH-MIL-125表现出最佳的光电化学性能。为了进一步提高3D-TNAs@NH-MIL-125对TC的降解效率，构建了光电-Fenton（PEF）系统。探讨了HO浓度、溶液pH值和施加偏压电势对TC降解的影响。结果表明，当pH值为5.5、HO浓度为30 mM且施加偏压为0.7 V时，TC的降解率比纯光电催化降解过程高24%。3D-TNAs@NH-MIL-125增强的光电-Fenton性能可归因于TiO纳米管与NH-MIL-125之间的协同效应导致的大比表面积、优异的光利用率、高效的界面电荷转移、低电子-空穴复合率以及高˙OH产量。
