RODRIGO TEIXEIRA BENTO

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Fator de Impacto: 6.000 ou mais × Agência de fomento: Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) ×

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    Artigo IPEN-doc 30844
    Influence of carbon content and irradiation modes on the antibiotic removal from water using VIS-activated TiO2/expanded graphite composite photocatalysts
    2024 - BENTO, RODRIGO T.; PALHARIM, PRISCILA H.; TEIXEIRA, ANTONIO C.S.C.; PILLIS, MARINA F.
    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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    Artigo IPEN-doc 30420
    Highly stable WO3-Ag-AgCl films for continuous water treatment synthesized using a new low-cost ultrasonic spray-pyrolysis/photoreduction approach
    2024 - PALHARIM, PRISCILA H.; GUSMAO, CAROLINA; RAMOS, BRUNO; BENTO, RODRIGO T.; PILLIS, MARINA F.; TEIXEIRA, ANTONIO C.S.C.
    This study reports the successful synthesis of WO3-Ag-AgCl films on glass substrates using a simple and cost-effective ultrasonic spray-pyrolysis/photoreduction method, intended for use in continuous flat plate photochemical reactors. A central composite design was used to optimize the amounts of WO3 and AgCl deposited on the substrate. The films synthesized under varying conditions exhibited heterojunctions of WO3 and AgCl, whose photocatalytic efficiency, assessed by the removal of the model contaminant acetaminophen (ACT) under continuous flow, was greatly influenced by the amount of AgCl deposited on the substrate, while that of WO3 had a minimal impact on ACT removal. The film with WO3:AgCl molar ratio of 1.84 showed exceptional stability over 20 h of continuous operation, with only a 4 % reduction in contaminant removal. Additional tests using a real pharmaceutical effluent spiked with ACT confirmed the high (>92 %) ACT removal of this film formulation and its stability; further tests indicated •OH and O2•− as the primary reactive species involved in the photodegradation reaction. Overall, these findings offer promising and cost-effective alternatives for synthesizing highly stable WO3-Ag-AgCl films that are efficient in treating real pharmaceutical effluents containing emerging contaminants using sunlight.