催化作用
化学
膜
单线态氧
降级(电信)
化学工程
热解
过硫酸盐
光催化
无机化学
活性炭
析氧
光化学
核化学
氧气
有机化学
生物化学
工程类
作者
Jian Ye,Jiangdong Dai,Chunxiang Li,Yongsheng Yan
标识
DOI:10.1016/j.cej.2020.127805
摘要
The integration of advanced oxidation processes (AOPs) and catalytic membrane for filtration and peroxymonosulfate (PMS) activation was appealing for persistent organic pollutants removal. However, constructing a robust catalytic membrane with high reactivity and stability is highly desirable and still challenging. Herein, a kind of novel lawn-like Co 3 O 4 @nitrogen-doped carbon nanotube composites (Co 3 O 4 @NCNTs) by the pyrolysis of ZIF-67 in-situ grown on g-C 3 N 4 was unprecedentedly designed, and then immobilized into protonated g-C 3 N 4 (g-CN) membrane to construct Co 3 O 4 @NCNTs/g-CN membrane by vacuum-assisted filtration, where active sites were completely exposed for oxidants and target pollutants. As expected, the degradation rate of sulfamethoxazole (SMX, 20 mg/L) in Co 3 O 4 @NCNTs-0.5 (0.01 g/L)/peroxymonosulfate (PMS, 0.2 g/L) system was 0.2224 min −1 , which was 35.9 times higher than that of Co 3 O 4 @NCs (0.0062 min −1 ) derived from ZIF-67. Besides, it was found that the introduction of lawn-like Co 3 O 4 @NCNTs significantly improved the surface hydrophilicity of g-CN membrane, consequently, the permeation flux of the Co 3 O 4 @NCNTs/g-CN membrane showed a 16.7 folds increase. Ultimately, the synergistic degradation and filtration process of catalytic membrane not only exhibited superior catalytic and self-cleaning property in humic acid (HA)/SMX coexistence system, but also significantly reduced the leaching concentration of Co 2+ (0.016 mg/L) after 5 runs compared to that of Co 3 O 4 @NCs/PMS system (0.041 mg/L), demonstrating improved stability and reusability. Furthermore. scavenger experiments and electron paramagnetic resonance (EPR) tests verified that the SMX degradation was dominated for the coexistence of multiple reactive active species (ROS, SO 4 · − , ·OH and 1 O 2 ) while 1 O 2 was a major contributor. Overall, this work offered new prospects in developing novel catalytic self-cleaning membrane. • Co 3 O 4 @NCNTs/g-CN membrane was fabricated for synergistic degradation and filtration of SMX. • Co 3 O 4 @NCNTs/g-CN membrane exhibited ideal catalytic activity of SMX degradation. • Co 3 O 4 @NCNTs/g-CN membrane exhibited excellent self-cleaning property in HA-SMX coexistence system. • 1 O 2 was a major contributor in the oxidation process.
科研通智能强力驱动
Strongly Powered by AbleSci AI