1. Ultrafast short-range catalytic pathway modified peroxymonosulfate activation over CuO with surface oxygen defects for tetracycline hydrochloride degradation.
- Author
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Zhu, Yi, Guan, Zeyu, Li, Xiaohu, Xia, Dongsheng, and Li, Dongya
- Subjects
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TETRACYCLINE , *COPPER oxide , *TETRACYCLINES , *SURFACE defects , *PEROXYMONOSULFATE , *METALLIC oxides - Abstract
The presence of antibiotics in water bodies seriously threatens the ecosystem and human health. Advanced oxidation processes (AOPs) based on peroxymonosulfate (PMS), an effective method to remove antibiotics, have a bottleneck problem that the low oxidant utilization is attributed to the hindered electron transfer between metal oxides and peroxides. Here, CuO with rich oxygen vacancies (OVs), MSCuO-300, was synthesized to efficiently degrade tetracycline hydrochloride (TTCH) ( k = 0.095 min−1). The dominant role of direct adsorption and activation of OVs and its regulated Cu–O, rather than surface hydroxyl adsorption, mediated a short-range catalytic pathway. The shortened catalytic pathway between active sites and PMS accelerated the charge transfer at the interface, which promoted PMS activation. Compared with Cu x O-500 and Commercial CuO, the activation rate of PMS was increased by 11.97, and 12.64 times, respectively. OVs contributed to the production of 1O 2 and O 2 •-, the main active species. In addition, MSCuO-300/PMS showed excellent adaptability to real water parameters, such as pH (3–11), anions, and continuous reactor maintained for 168 h. This study provides a successful case for the purification of antibiotic-containing wastewater in the design of efficient catalysts by oxygen defect strategies. [Display omitted] • Oxygen vacancies (OVs) and its regulated Cu2+ accelerated electron transfer. • OVs-rich CuO mediated a short-range catalytic pathway for PMS activation. • The active species contained 1O 2 , O 2 •-, SO 4 −•, and •OH. • The system operated stably for 168 h (100% contaminant removal). [ABSTRACT FROM AUTHOR]
- Published
- 2023
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