Oxygen vacancies-enriched Cu/Co bimetallic oxides catalysts for high-efficiency peroxymonosulfate activation to degrade TC: Insight into the increase of Cu+ triggered by Co doping

Current Mechanism of Peroxymonosulfate Activation by Cobalt-Based Heterogeneous Catalysts in Degrading Organic Compounds

“…5,5-Dimethyl-1-pyrroline-N-oxide (DMPO) is used to capture free radicals, and 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMP) is used to capture singlet oxygen. ROS can also be identified using electron paramagnetic resonance (EPR) spectroscopy in capture reactions . For nonradical pathways, electrochemical methods can identify mediated electron transfer pathways, Raman spectroscopy is used to compare changes on the catalyst surface to identify surface-bound species, and methyl phenyl sulfoxide (PMSO) can identify high-valent metal species. , The adsorption of PMS on the catalyst surface is a prerequisite for activation .…”

“…For example, the action of OH – inhibits the formation of OH – and SO 4 •– from the broken bond of PMS under alkaline conditions, and it has been reported that SO 4 •– may be actively converted into • OH under alkaline conditions. The production of • OH will increase, and OH – will consume the PMS reaction to produce SO 5 2– . The SO 5 •– produced by the PMS losing an electron can also react with H 2 O, changing the way 1 O 2 is produced, and anions such as Cl – and HCO 3 – consume SO 4 •– and • OH, resulting in a decrease in the number of free radicals. − However, the phenomenon of bond breaking occurring after the PMS gains and loses electrons remains basically constant.…”

“…(d) The optimized crystal models of PMS adsorption on the Cu 2 O, CoO, and CuO and the structures and CDD diagrams of Cu 2 O@GCN, CoO@GCN, and Cu 2 O/CoO@GCN. Adapted with permission from ref . Copyright 2022 Elsevier.…”

“…Vacancies are easily generated during the preparation of catalysts, and the general methods of generating vacancies include hydrogen reduction, solution reduction, ,, and heat treatment reduction . There are also some special vacancy generation methods, such as atom doping ,, and oxygen-poor heat treatment. , They can introduce some vacancies, and the concentration of vacancies can also be increased by the atomic escape caused by balancing the charge during the formation of heterojunctions , and the decrease in the crystallinity brought by the introduction of microfragments . In addition, the vacancy itself can also serve as an active site, exhibiting catalytic properties.…”

Thickness Modification of BiOBr Nanosheets by Sn-TiO2 for Enhanced Photocatalytic Degradation of Antibiotics

“…Tetracycline hydrochloride (TC-HCl) and ciprofloxacin (CIP) are broad-spectrum antibiotics that have been used in medicine for many years. , However, TC-HCl and CIP had high stability and low biodegradability, making complete metabolic decomposition difficult and posing a significant threat to the ecological environment and human health. − Therefore, the simple and effective removal of antibiotics was indeed critical. Semiconductor photocatalysis appears to be a promising technology due to its high efficiency, safety, and nonpollution.…”