期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 317, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121704
关键词
Antibiotic; Hydrotalcite-like compounds; Oxygen vacancy regulation strategies; Peroxymonosulfate activation; Theoretical chemical calculation
资金
- Program for the National Natural Science Foundation of China [52100183, 52170161]
- Hunan Natural Science Foundation [2020JJ3009]
- Hunan Researcher Award Program [2020RC3025]
- Fundamental Research Funds for the Central Universities [531118010473]
This study investigated the triggering mechanism of peroxymonosulfate (PMS) activated by an oxygen vacancy (Ov)-rich cobalt (Co)-based hydrotalcite-like compound (CA-LDH). The results showed that the electron transfer properties of CA-LDH were improved by the introduction of Ov, leading to the efficient degradation of contaminants by the CA-LDH/PMS system. This study provides insights for rational catalyst synthesis and understanding the mechanism of PMS activation.
This work investigated the triggering mechanism of peroxymonosulfate (PMS) activated by an oxygen vacancy (Ov)-rich cobalt (Co)-based hydrotalcite-like compound (CA-LDH). CA-LDH was synthesized by a urea -hydrothermal process with ammonium citrate (CA) as the reducing agent. The PMS activation mechanism was investigated by combining batch experiments, characterization techniques, and DFT calculations. Over 98 % of CIP (20 mg/L) was degraded by the CA-LDH/PMS system within 60 min, which remained efficient in the presence of common interfering substances or over a wide pH range. DFT showed that CA was beneficial for introducing the electron transfer intermediate, namely, Ov, on CA-LDH, thereby allowing for the unique electron transfer performance of CA-LDH. Specifically, electron transfer from Co-Ov to PMS triggered the radical pathway, while electron transfer from PMS to Co-O-v triggered the nonradical pathway. Overall, this study provides a reference for the rational catalyst synthesis and the investigation of the triggering mechanism of PMS activation.
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