Confining cobalt sites within the matrix of accordion-like tubular carbon nitride for peroxymonosulfate activation to produce sulfate radicals and desirable singlet oxygen

Yu Yin, Rongrong Fang, Bing Hu, Qinxin Wang, Mengxuan Liu, Abdul Hannan Asif, Shaobin Wang, Hongqi Sun, Sheng Cui

Research output: Contribution to journalArticlepeer-review

Abstract

Carbon nitride (C3N4) was fabricated as an accordion-like tubular morphology with hollow interior. The atomically dispersed Co sites were successfully confined within the accordion-like tubular C3N4 (atCN) matrix and coordinated with N in the Co-N4 configuration. The resulting Co-atCN catalysts were employed for peroxymonosulfate (PMS) activation towards 4-chlorophenol (4-CP) degradation. The optimal 2.9Co-atCN/PMS system took merely 10 min to completely degrade 4-CP (k = 0.426 min−1). While the accordion-like tubular C3N4 with semi-hollow interior (atCN-sh) was applied, the 2.9Co-atCN-sh/PMS system took 60 min on eliminating barely 72.0 % of 4-CP (k = 0.020 min−1). Moreover, 2.9Co-atCN/PMS exhibited excellent activity on the removal of diverse contaminants, for example, methyl orange (MO), methylene blue (MB), 2,4,6-trichlorophenol (TCP), and acetaminophen (ACT). The 100 % removal efficiency reached within only 5, 45, 45, and 20 min, respectively. In addition, good resistance to environmental interferences was also unveiled in the 2.9Co-atCN/PMS system. Electron paramagnetic resonance (EPR) and quenching tests showed that OH, SO4• −, O2• − and 1O2 were produced in the reaction system of 2.9Co-atCN/PMS for 4-CP degradation, and the dominant oxygen species were determined to be not only conventional SO4• − but also favorable 1O2, and the latter contributed to the good resistance to environmental disturbances.

Original languageEnglish
Article number161535
JournalApplied Surface Science
Volume681
Early online date16 Oct 2024
DOIs
Publication statusPublished - 1 Feb 2025

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