Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 280, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2021.119791
Keywords
Peroxymonosulfate activation; N-doped porous carbons; Metal-free catalyst; Organic pollutant; Wastewater treatment
Categories
Funding
- National Natural Science Foundation of China [51720105001, 51968049]
- Natural Science Foundation of Jiangxi Province, China [20192ACB21031, 20192BCB23012]
- Graduate Innovation Foundation in Nan-chang Hangkong University [YC2020-S514]
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle [EL202180074]
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N-doped porous carbons (NPCs) were prepared and used to activate peroxymonosulfate (PMS) to degrade organic pollutants in water, showing excellent degradation performance and stability. This study provides a promising metal-free catalyst for organic pollutant removal and promotes sustainable development of carbon-based materials.
Carbon materials are becoming the first choice for activating persulfate due to their environmental friendliness, high chemical stability, and metal-free leaching. However, the preparation of efficient carbon catalyst and the indepth analysis for persulfate activation is still insufficient. Herein, N-doped porous carbons (NPCs) were prepared by the pyrolysis of polyacrylonitrile and used to trigger peroxymonosulfate (PMS) for degrading organic pollutants in water. The results showed that the optimized NPC-700, with large specific surface area, rich pore structure, high content of pyridinic N and graphitic N, as well as excellent oxygen-containing functional groups, possessed the best performance in activating PMS to degrade methylene blue (MB) with 99.15% degradation rate in 30 min. Furthermore, the NPC-700 delivered high stability under a wide pH from 3.51 to 11.15. The radical quenching experiments and electron paramagnetic resonance (EPR) spectroscopy revealed that center dot OH, O2 center dot-, SO4 center dot and 1O2 active species were involved in the catalytic oxidation of MB. Besides, the NPC-700/PMS system exhibited excellent degradation performance for various organic dyes, including rhodamine B, acid orange 7, and methyl orange. This study not only provides a promising metal-free catalyst for the removal of organic pollutant in water, but also promotes the sustainable development of carbon-based materials.
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