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Hybrid TiO2/Carbon quantum dots heterojunction photoanodes for solar photoelectrocatalytic wastewater treatment.
Xu, Jianxiong; Olvera-Vargas, Hugo; Ou, Gloria Hui Xin; Randriamahazaka, Hyacinthe; Lefebvre, Olivier.
Afiliación
  • Xu J; Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore.
  • Olvera-Vargas H; Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore; Instituto de Energías Renovables, Universidad Nacional Autónoma de México (IER-UNAM), Priv. Xochicalco S/N, Col. Centro, Temixco, Morel
  • Ou GHX; Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore.
  • Randriamahazaka H; Université Paris Cité, CNRS, ITODYS, 45 Rue des Saints-Pères, F-75006, Paris, France. Electronic address: hyacinthe.randria@u-paris.fr.
  • Lefebvre O; Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore; NUS Environmental Research Institute, National University of Singapore, #02-03, T-Lab Building 5A Engineering Drive 1, Singapore,117411
Chemosphere ; 341: 140077, 2023 Nov.
Article en En | MEDLINE | ID: mdl-37690559
The modification of titanium dioxide (TiO2) is a strategy to maximize the utilization of sunlight. Carbon quantum dots (CQDs) are carbon nanomaterials with outstanding optical and electronic properties that are suitable for that purpose. In this work, three types of hybrid TiO2/CQD photoelectrodes were synthesized following different methods: 1) deposition of a CQD layer on top of TiO2 (labelled as TiO2-CQD); 2) deposition of a TiO2 layer on top of CQDs (labelled as CQD-TiO2) and; 3) deposition of a mixed CQD + TiO2 layer (labelled as CQD + TiO2). The photoelectrodes were investigated for the photoelectrocatalytic degradation of phenol as model pollutant under simulated solar light and TiO2-CQD showed the highest apparent reaction rate constant of kapp = 0.0117 min-1 with 40% of TOC removal in 6 h of treatment. CQDs were found to enhance photon absorption in the visible region of the electromagnetic spectrum and in turn phenol degradation by promoting the separation of photogenerated charge carriers through electron transfer via the Ti-O-C bonds formed at the TiO2-CQD interface. Finally, the performance of the TiO2-CQD photoanode was evaluated for the treatment of real wastewater from the membrane fabrication sector, confirming its photoelectrocatalytic efficiency under solar radiation with 93% of TOC removal in 8 h of treatment and kapp = 0.0058 min-1.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Luz Solar / Puntos Cuánticos Idioma: En Revista: Chemosphere Año: 2023 Tipo del documento: Article País de afiliación: Singapur Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
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XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Luz Solar / Puntos Cuánticos Idioma: En Revista: Chemosphere Año: 2023 Tipo del documento: Article País de afiliación: Singapur Pais de publicación: Reino Unido