Nanoconfined Cobalt Ferrite Composite Carbon Nanotube Membrane Oxidation-Filtration System for Water Decontamination

作者：Huanran Ma, Lijun Zhang, Xiao Zhang, Zonglin Pan, Ruisong Xu, Guanlong Wang, Xinfei Fan, Huixia Lu, Shuaifei Zhao, Chengwen Song · 发表于：ACS ES&T Engineering · 年份：2024 · DOI：10.1021/acsestengg.4c00282 · 被引用次数：11 · 研究领域：Advanced oxidation water treatment、Membrane Separation Technologies、Advanced Photocatalysis Techniques

Constructing a membrane-confined peroxymonosulfate (PMS) activation system has emerged as a promising strategy for efficient water decontamination. Herein, a novel cobalt ferrite (CoFe 2 O 4 )-filled open-end carbon nanotube (OCNT) membrane filtration system was proposed, aiming to integrate dual metal centers and nanoconfinement for enhancing PMS activation (MFPA) toward water decontamination. The optimal CoFe 2 O 4 @OCNT MFPA process displayed 100% phenol removal within a residence time of 5.7 s, whose k (1.17 s –1 ) was 3.0, 5.6, and 3.9 times higher than that of CoO@OCNT, FeO@OCNT, and CoFe 2 O 4 /CCNT (surface-loaded closed end cap CNT), respectively. Experimental results and theoretical calculations jointly unravel the nonradical-dominated ( 1 O 2 and electron transfer) oxidation mechanism, leading to the wide-pH adaptation and superior stability in the complex water matrix. Mechanism analysis showed that fast cycling of Co 2+ /Co 3+ was achieved via synergistic promotion between dual metal centers and the nanoconfinement effect, which coboosted the PMS consumption as well as reactive oxygen species generation (especially 1 O 2 ). Compared with the single metal center, the dual metal centers of internal CoFe 2 O 4 exhibited coenhanced electron cloud density (amount of charge transfer) and adsorption energy for PMS, resulting in O–O cleavage and elongated O–H. Meanwhile, the oxygen vacancy defect (O def ) on CoFe 2 O 4 also contributed to the nonradical process, which no...