Journal
CHEMOSPHERE
Volume 288, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.132558
Keywords
Co-Bi25FeO40; Microwave; PDS; Non-radical oxidation pathway; Disinfection
Categories
Funding
- National Natural Science Foundation of China [51902169, 21906088]
- National Science Foundation for Post-doctoral Scientists of China [2021T140165]
- Heilongjiang Provincial Natural Science Foundation of China [LH2020B023]
- Fundamental Research Funds for Heilongjiang Province Advantageous Characteristic Discipline [YSTSXK201855, YSTSXK201856]
- Depart-ment of Education Heilongjiang Province [135309351, 135309338]
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT-2020068, UNPYSCT-2020067, YJSCX2020007]
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The Co-Bi25FeO40 catalyst in combination with MW/PDS system shows superior catalytic efficiencies for degrading BPA and disinfecting E.coli simultaneously. The microwave energy promotes the production of nanobubbles and enhances the reaction efficiency. This work demonstrates the potential for efficient integration of contaminant purification and pathogenic microorganism inactivation.
Cobalt doped Bi25FeO40 was used as a heterogeneous catalyst in microwave (MW) co-activation of peroxydisulfate (PDS) system for organic contaminant purification and disinfection simultaneously. Due to low charge-transfer resistance and fast electron migration, Co-Bi25FeO40 showed superior catalytic efficiencies for activation PDS to degrade over 92.0% of bisphenol A (BPA) with the initial concentrations ranging from 40 mg/L to 120 mg/L in 5.0 min. The non-radical oxidation pathway via electron transfer regime on the surface of Co-Bi25FeO40 was the dominant reactive species in the reaction system. Benefit from the energy transfer and cross-coupling reactions of microwave, the Co-Bi25FeO40/MW/PDS system can generate abundant reactive sites to facilitate the formation of more surface-bonding complexes. Microwave energy can be absorbed by Co-Bi25FeO40 catalysts to promote activation of PDS and production of nanobubbles. The generated nanobubbles increase the temperature of the local solution to promote the reaction. The Co-Bi25FeO40/MW/PDS system also exhibited excellent bactericidal capability for Escherichia coli (E.coli). The catalysts, oxidants and microwaves acted on E. coli to form physical, and oxidative pressure simultaneously, causing cell damaged and made bacterial death. This work provides prospects toward high-efficiency integration of contaminant purification and pathogenic microorganisms inactivation.
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