Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 119, Issue 30, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2202682119
Keywords
advanced oxidation process; peroxymonosulfate; catalysis; water treatment; large-scale
Categories
Funding
- National Natural Science Foundation of China [22106159, 52192684, 51821006]
- China Postdoctoral Science Foundation [2021M693073]
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This study develops a facile method for the scalable production of Cu-Fe-Mn spinel oxide catalysts with rich oxygen vacancies and symmetry-breaking sites. The CuFeMnO catalyst exhibits superior PMS-catalytic capacity. The study also explores the working reactive species and their contributions for different organic pollutants. Furthermore, the CuFeMnO-PMS system demonstrates efficient and stable removal of pollutants in wastewater, indicating potential for large-scale water treatment applications.
Heterogeneous peroxymonosulfate (PMS)-based advanced oxidation processes (AOPs) have shown a great potential for pollutant degradation, but their feasibility for large-scale water treatment application has not been demonstrated. Herein, we develop a facile coprecipitation method for the scalable production (similar to 10 kg) of the Cu-Fe-Mn spinel oxide (CuFeMnO). Such a catalyst has rich oxygen vacancies and symmetry-breaking sites, which endorse it with a superior PMS-catalytic capacity. We find that the working reactive species and their contributions are highly dependent on the properties of target organic pollutants. For the organics with electron-donating group (e.g., -OH), high-valent metal species are mainly responsible for the pollutant degradation, whereas for the organics with electron-withdrawing group (e.g., -COOH and -NO2), hydroxyl radical (center dot OH) as the secondary oxidant also plays an important role. We demonstrate that the CuFeMnO-PMS system is able to achieve efficient and stable removal of the pollutants in the secondary effluent from a municipal wastewater plant at both bench and pilot scales. Moreover, we explore the application prospect of this PMS-based AOP process for large-scale wastewater treatment. This work describes an opportunity to scalably prepare robust spinel oxide catalysts for water purification and is beneficial to the practical applications of the heterogeneous PMS-AOPs.
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