Peroxymonosulfate activation of magnetic Co nanoparticles relative to an N-doped porous carbon under confinement: Boosting stability and performance

By Jiao Cao, Zhao-hui Yang, Weiping Xiong, Yaoyu Zhou, You Wu, Meiying Jia, Sai-wu Sun, Chengyun Zhou, Yanru Zhang, R. Zhong. 2020

141 citations recorded by the source corpus.

Abstract The integration of metal nanoparticles into carbon materials has catch considerable attention. In this study, we have successfully fabricated the N-doped porous carbon encapsulated magnetic Co nanoparticles (Co@NC-800) through a two-step pyrosis of zeolitic imidazolate frameworks (ZIF-67). The obtained Co@NC-800 exhibited excellent stability in activating peroxymonosulfate (PMS) towards tetracycline (TC) degradation without obvious Co leaching and magnetically separable. The removal efficiency reached up to 90.1% within 3 min and 74.7% of total organic carbon (TOC) removal efficiency could be obtained in 30 min towards TC by Co@NC-800/PMS system. Mechanism explorations revealed the encapsulated Co nanoparticles in the porous N-doped carbon promoted the catalytic activity and stability. The two-pathway mechanism study indicated that radical and non-radical oxidations acted together in TC degradation. Moreover, some potential factors, including PMS dosage, TC concentration, solution pH value, anion/organic matters and temperature were investigated. The Co@NC-800/PMS system exhibited high efficiency in removal of various antibiotics (oxytetracycline, chlortetracycline and deoxytetracycline). Even in actual water bodies (tap water, river water and pharmaceutical wastewater), the Co@NC-800/PMS system displayed excellent performance. This study proposed a design of metal nanoparticles under confinement for fabricating highly active catalysts towards PMS activation.

Subfields: Biomedical Engineering, Renewable Energy, Sustainability and the Environment, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/2b3d5cfbe9e08d13cd0728de1b0de6ffb8a274fa