Influence of carbon content and irradiation modes on the antibiotic removal from water using VIS-activated TiO2/expanded graphite composite photocatalysts
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Chemosphere
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TiO2/expanded graphite (TiO2/EG) composite films were applied to water treatment for sulfadiazine (SDZ) degradation in a continuous flat plate photochemical reactor. The films were synthesized by sol-gel method and deposited on borosilicate glass by airbrush spray coating technique, forming a TiO2/C heterojunction. Increasing the amount of carbon promoted more efficient photocatalytic removal of SDZ under simulated sunlight, which increased from 9.1% in the absence of carbon to 49.8% for the material containing 7.5% C. From the formation of the TiO2/C heterojunction, morphological modifications, changes in the electronic structure and reduction of the band gap energy were observed. Type-II heterojunction formation was observed. Foreground and background irradiation modes were investigated, and a possible photocatalytic mechanism was proposed. TiO2/7.5 %-EG exhibited the best photocatalytic performance, with the possibility of reuse. The films showed good reusability in the SDZ degradation over 4 photocatalytic cycles. The influence of irradiation modes and the role of oxidizing species were discussed. The results showed that TiO2/EG hybrid films are a promising alternative for practical photocatalytic applications under sunlight.
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BENTO, RODRIGO T.; PALHARIM, PRISCILA H.; TEIXEIRA, ANTONIO C.S.C.; PILLIS, MARINA F. Influence of carbon content and irradiation modes on the antibiotic removal from water using VIS-activated TiO2/expanded graphite composite photocatalysts. Chemosphere, v. 365, p. 1-11, 2024. DOI: 10.1016/j.chemosphere.2024.143329. Disponível em: https://repositorio.ipen.br/handle/123456789/48791. Acesso em: 30 Dec 2025.
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