过氧二硫酸盐
碳化
单线态氧
光化学
碳纳米管
材料科学
过硫酸盐
聚苯胺
催化作用
电子顺磁共振
化学
化学工程
无机化学
氧气
纳米技术
有机化学
聚合
吸附
聚合物
工程类
物理
核磁共振
作者
Taigang Ma,Meijun Liu,Tingting Li,Hejun Ren,Rui Zhou
标识
DOI:10.1016/j.seppur.2022.121124
摘要
In this work, a novel nitrogen-doped carbon nanotube catalyst (CPNT-10) was developed using the low-cost polyaniline (PANI) nanotubes as the precursor, which exhibited excellent peroxydisulfate (PDS) catalytic activity to degrade 2,4-dichlorophenol (2,4-DCP). The CPNT-10/PDS system could achieve approximately 100% PDS utilization and was efficient over a wide pH range (3.00–9.00). Integrated with electron paramagnetic resonance (EPR), quenching tests and electrochemical analysis, singlet oxygen (1O2) dominated the degradation of 2,4-DCP and free radicals (O2•-, •OH and SO4•-) mainly played auxiliary roles, while direct electron transfer was negligible. Furthermore, the structure–activity relationship analysis validated that the vacancy, graphitic sp2 carbon, C = N, and pyridine-N-O jointly involved in PDS activation, and vacancy played the most important part. This study provides a cheap and efficient nitrogen-doped carbon nanotube for environmental remediation and deepens the insight into mechanisms of persulfate activation with carbon-based materials.
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