Integrating N and F co-doped TiO2 nanotubes with ZIF-8 as photoelectrode for enhanced photo-electrocatalytic degradation of sulfamethazine
Integrating N and F co-doped TiO2 nanotubes with ZIF-8 as photoelectrode for enhanced photo-electrocatalytic degradation of sulfamethazine
复制标题
将 N 和 F 共掺杂 TiO2 纳米管与 ZIF-8 集成作为光电极，增强磺胺二甲嘧啶的光电催化降解
DOI：
10.1016/j.cej.2020.124388
复制
发表时间：
2020-05-15
影响因子：
15.1
通讯作者：
Wang, Wenjun
中科院分区：
文献类型：
--
作者：
Jia, Meiying;Yang, Zhaohui;Wang, Wenjun
传统的光阳极通过在导电玻璃上涂覆粉末状催化剂来降低传质速率。本工作采用电化学阳极氧化和沉积生长的方法，制备了可见光驱动的半导体-金属有机框架（MOFs）杂化光电极。ZIF-8/NF-TiO 2光电极是以中空TiO 2纳米管为基体，经N、F共掺杂后在金红石型TiO 2表面沉积ZIF-8纳米粒子。与未改性的TiO 2相比，ZIF-8/NF-TiO 2的反应速率提高了21.7倍，光电催化过程的协同因子可达3.5。ZIF-8的多孔结构，金红石型和金红石型TiO 2的本征能带差异，大大提高了光利用率，促进了电子空穴分离。该电极重复性好，重复使用8次后，降解效率基本不变。提出了磺胺二甲嘧啶可能的降解途径和光电催化降解机理。这一进展可能为设计荧光体-MOFs复合光电催化剂带来新的见解。
Traditional photoanodes decreased in mass transfer rate via coating powdered catalysts on conductive glass. In this work, we obtained a visible light-driven semiconductor- metal organic frameworks (MOFs) hybrid photo-electrode, which was constructed by electro-anodization and deposition growth process. The ZIF-8/NF-TiO2 photoelectrode was based on hollow TiO2 nanotubes, and ZIF-8 nanoparticles were deposited on the surface of the pyramid-shaped rutile TiO2 substrate after N and F co-doping. Compared with unmodified anatase TiO2, the reaction rate of ZIF-8/NF-TiO2 increased by 21.7 times, and the synergistic factor in the photo-electrocatalytic process could reach to 3.5. The porous structure of ZIF-8, the intrinsic band difference between anatase and rutile TiO2 greatly improved light utilization, and promoted electron-hole separation. The electrode could be easily recycled and exhibit excellent repeatability, and the degradation efficiency almost unchanged after 8 cycles. Moreover, possible degradation pathways and photo-electrocatalytic degradation mechanisms of sulfamethazine were proposed. This progress could bring novel insights for the design of semiconductor-MOFs hybrid photo-electrocatalysts.