Surface plasmon resonance-induced visible light photocatalytic TiO2 modified with AuNPs for the quantification of hydroquinone

Autor(es)

Mendonca, Camila D. ^{[1, 2]} ; Khan, Shahid U. ^{[1, 3, 4]} ; Rahemi, Vanoushe ^[1] ; Verbruggen, Sammy W. ^{[3, 4]} ; Machado, Sergio A. S. ^[2] ; De Wael, Karolien ^{[1, 4]}

Afiliação do(s) autor(es)

^[1] Univ Antwerp, AXES Res Grp, Groenenborgerlaan 171, B-2020 Antwerp - Belgium

^[2] Univ Sao Paulo, Sao Carlos Inst Chem, IQSC USP, Av Trabalhador Sao Carlense 400, Sao Carlos, SP - Brazil

^[3] Univ Antwerp, Sustainable Energy Air & Water Technol DuEL, Groenenborgerlaan 171, B-2020 Antwerp - Belgium

^[4] Univ Antwerp, NANOlab, Ctr Excellence, Groenenborgerlaan 171, B-2020 Antwerp - Belgium

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 389, SEP 1 2021.
• Citações Web of Science: 0

Resumo

The impregnation of size-controlled gold nanoparticles (AuNPs) on an anatase TiO2 structure (AuNPs@TiO2) was studied for the photoelectrochemical detection of hydroquinone (HQ) under visible light illumination integrated into a flow injection analysis (FIA) setup. The crystalline form of TiO2 was preserved during synthesis and the homogeneous distribution of AuNPs over the TiO2 structure was confirmed. Its photoelectrocatalytic activity was improved due to the presence of AuNPs, preventing charge recombination in TiO2 and improving its light absorption ability by the surface plasmon resonance effect (SPR). The FIA system was used in order to significantly reduce the electrode fouling during electroanalysis through periodic washing steps of the electrode surface. During the amperometric detection process, reactive oxygen species (ROS), generated by visible light illumination of AuNPs@TiO2, participate in the oxidation process of HQ. The reduction of the oxidized form of HQ, i.e. benzoquinone (BQ) occurs by applying a negative potential and the measurable amperometric response will be proportional to the initial HQ concentration. The influencing parameters on the response of the amperometric photocurrent such as applied potential, flow rate and pH were investigated. The linear correlation between the amperometric response and the concentration of HQ was recorded (range 0.0125 - 1.0 mu M) with a limit of detection (LOD) of 33.8 nM and sensitivity of 0.22 A M-1 cm(-2). In this study, we illustrated for the first time that the impregnation of AuNPs in TiO2 allows the sensitive detection of phenolic substances under green laser illumination by using a photoelectrochemical flow system. (C) 2021 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 16/06139-9 - Desenvolvimento de um sensor foto-eletroquímico nanoestruturado para o monitoramento de p-nitrofenol em águas de abastecimento
• Beneficiário: Camila Domingues Mendonça Verbinnen
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/13724-0 - Desenvolvimento de um sensor fotoeletroquímico para a quantificação de contaminantes fenólicos
• Beneficiário: Camila Domingues Mendonça Verbinnen
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado