Iron-decorated covalent organic framework as efficient catalyst for activating peroxydisulfate to degrade 2,4-dichlorophenol: Performance and mechanism insight

• Published in: Journal of colloid and interface science Vol. 663; pp. 238 - 250
• Main Authors: Han, Yuhang, Tai, Meng, Yao, Yuxin, Li, Jingyang, Wu, Yuanyuan, Hu, Bo, Ma, Yunchao, Liu, Chunbo
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.06.2024
• Subjects: 2,4-dichlorophenol; Covalent organic frameworks; Degradation; Peroxydisulfate; Covalent organic frameworks; Degradation; Peroxydisulfate; 2,4-dichlorophenol
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2024.02.165

A post-modified covalent organic skeleton (JLNU-305-Fe) for degradation of 2,4-DCP was prepared. This study provides a broad prospect for the practical application of COF materials in the degradation of organic pollutants. [Display omitted] Herein, a novel two-dimensional double-pore covalent organic framework (JLNU-305) was synthesized using N,N,N',N'-tetrakis(4-aminophenyl)-1,4-phenylenediamine (TAPD) and 2,2′-bipyridine-5,5′-dicarboxaldehyde (BPDA). The extended π-π conjugated structure and nitrogen-riched pyridine in JLNU-305 (JLNU = Jilin Normal University) provide abundant binding sites for Fe doping. The obtained JLNU-305-Fe exhibited high and recycled catalytic efficiency for peroxydisulfate (PDS) activation to completely degrade 10 mg/L 2,4-dichlorophenol (2,4-DCP) within 8 min. The JLNU-305-Fe/PDS system showed excellent catalytic activity and cyclic stability. The capture experiments and electron paramagnetic resonance (ESR) analysis indicated that the catalytic behavior of JLNU-305-Fe/PDS is contributed to the synergistic effect between free radicals and non-free radicals. It is the first time to activate PDS for covalent organic frameworks (COFs) being used to degrade 2,4-DCP, which has a great potential for development and practical application in related water environment remediation.