Bisphenol A degradation by manganese oxides at circumneutral pH: Quantitative evaluation of dissolved Mn(III) species with pyrophosphate
Journal Article
·
· Journal of Hazardous Materials
- Fudan Univ., Shanghai (China)
- Southern University of Science and Technology (SUSTech), Shenzhen (China); Fudan Univ., Shanghai (China)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Fudan Univ., Shanghai (China); Shanghai Institute of Pollution Control and Ecological Security (China)
Although trivalent manganese (Mn(III)) species have been recognized as crucial intermediates in the degradation of organic contaminants by Mn oxides, quantitative research on their specific roles remains scarce. Here, our study investigated the degradation processes of an organic pollutant, Bisphenol A (BPA), by dissolved Mn(III) and Mn(III)-bearing oxides, and elucidated the differences of the underlying mechanisms and reaction pathways between several Mn oxides and dissolved Mn(III). Our results indicated that BPA degradation rates with Mn(III)-bearing oxides alone follow the order: δ-MnO2 >> γ-MnOOH > Mn3O4. Adding pyrophosphate (PP) significantly enhanced BPA degradation by promoting the formation of Mn(III)-PP complexes and exposing more reactive sites, achieved through destabilizing the crystal structure and mitigating of Mn(II) readsorption, particularly in γ-MnOOH and Mn3O4. Our kinetic model revealed that heterogeneous degradation by Mn oxides is the predominant reaction pathway, accounting for 61.4 %, 87.8 %, and 73.8 % of the total degraded BPA for δ-MnO2, γ-MnOOH, and Mn3O4, respectively, even in the presence of significant amount of dissolved Mn(III) intermediates due to high PP concentrations. These results offer mechanistic details on BPA degradation by Mn oxides and the influence of ligand concentration, providing helpful insights for optimizing degradation strategies of organic pollutants.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- China Postdoctoral Science Foundation; National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 2491440
- Journal Information:
- Journal of Hazardous Materials, Journal Name: Journal of Hazardous Materials Vol. 486; ISSN 0304-3894
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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