Hydrotalcite

Gene

Catalysis

Engineering

Photochemistry

Telecommunications

Biochemistry

Computer science

Electron transfer

Inorganic chemistry

Chemical engineering

Hydrothermal synthesis

Organic chemistry

Urea

Oxygen

Hydrothermal circulation

Degradation (telecommunications)

Radical

Activator (genetics)

Cobalt

Chemistry

Applied Catalysis B Environment and Energy

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-Ov 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.

Citrate-regulated synthesis of hydrotalcite-like compounds as peroxymonosulfate activator - Investigation of oxygen vacancies and degradation pathways by combining DFT