Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 595, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.124679
Keywords
CuFeS2; Citric acid; Photo-Fenton; Bisphenol A; Intermediates; Hydroxyl radical
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Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior -Brasil (CAPES) [001, 88881.187674/2018-01 -PDSE]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico Brasil (CNPq)
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In this study, for the first time, citric acid was employed as a chelating agent in CuFeS2 synthesis in order to accelerate the regeneration of Fe2+ during the photo-Fenton reaction, promoting a faster production of (OH)-O-center dot radicals. The novel CuFeS2 material showed remarkable catalytic efficiency for bisphenol A (BPA) degradation during the photo-Fenton process under visible light and near-natural pH, with a rate 10 times faster than that of CuFeS2 prepared without citrate. Furthermore, CuFeS2 promoted rapid generation of (OH)-O-center dot radicals and showed efficient H2O2 consumption, sustaining the catalytic efficiency and stability even after 4 consecutive cycles of use. CuFeS2 was also efficient for BPA degradation from a municipal wastewater treatment plant effluent. BPA by-products were identified and a mechanism for BPA degradation was proposed. After the photo-Fenton process, no Fe3+ species were identified on the catalyst surface by X-ray photoelectron spectroscopy (XPS), indicating that citric acid accelerated the conversion of Fe3+/Fe2+, thus increasing the generation of (OH)-O-center dot and the process efficiency.
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