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Insight into interactive synergy of MoS2@CoNC for peroxymonosulfate activation: From bath experiments to continuous flow experiments
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DOI：10.1016/j.seppur.2024.130290.png)
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Abstract
En 中文
As catalysts for peroxymomosulfate (PMS) activation, several carbon materials derived from MOFs have gained considerable attention. Despite this, Fenton-like reactions have always been limited by cycle efficiency of metal's valence state. In this study, a novel catalyst (MoS2@CoNC), Molybdenum disulfide (MoS2) modified CoNC (derived from ZIF-67), was successfully synthesized. Catalytic experiments indicated that the carbamazepine (CBZ) degradation efficiency could be enhanced in the MoS2@CoNC-PMS process. Moreover, PMS decomposition also exhibited outstanding performance compared with other processes. Various quenching experiments and ESR analyses indicated that CBZ degradation is mainly caused by nonradical oxidation (86.10 %). In addition, Density Functional Theory (DFT), in-situ Raman, and in-situ FTIR were employed to elucidate PMS activation mechanism. The generation pathways of singlet oxygen (1O2), cobalt-oxo species (CoVI = O), and electron transfer were systematically elaborated. X-ray Photoelectron Spectroscopy (XPS) analysis identified unsaturated S as a significant factor contributing to MoS2@CoNC stability. Further investigation into CBZ degradation was conducted using DFT and LC-MS. The toxicity of intermediates was also assessed through TEST and bean sprout cultivation. Additionally, a continuous flow experiment is performed to evaluate the practical application of MoS2@CoNC- PMS. After 10 h, CBZ removal efficiency is approximately maintained at 90 %. Water matrix effects and multi- pollutant degradation also determined that the MoS2@CoNC-PMS process is a promising method for pollutants degradation.
Keywords:
Molybdenum disulfide
Peroxymomosulfate
Interactive synergy
Nonradical oxidation
Continuous flow experiment
Journal
IF:
9
Papers:
2.9W
Citations:
12.1W