Photocurrent Response and Progesterone Degradation by Employing WO3 Films Modified with Platinum and Silver Nanoparticles

Autor(es)

dos Santos Costa, Maria Joseita ^[1] ; Costa, Gilson dos Santos ^[1] ; Brandao Lima, Aline Estefany ^[1] ; da Luz Junior, Geraldo Eduardo ^[1] ; Longo, Elson ^[2] ; Cavalcante, Laecio Santos ^[1] ; Santos, Reginaldo da Silva ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Piaui, PPGQ GERATEC, Dept Chem, Rua Joao Cabral 2231, POB 381, BR-64002150 Teresina, PI - Brazil

^[2] Univ Estadual Paulista, CDMF, Dept Chem Mat, POB 355, BR-14801907 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CHEMPLUSCHEM; v. 83, n. 12, p. 1153-1161, DEC 2018.
• Citações Web of Science: 1

Resumo

The effect of silver (Ag-0) and platinum (Pt-0) metallic nanoparticles (NPs) on WO3 film was investigated by studying the photocurrent response under polychromatic irradiation. The structural phase revealed by X-ray diffraction analysis indicates a monoclinic crystal nanostructure. WO3, Ag-0/WO3, and Pt-0/WO3 electrodes were used to degrade 0.35 mg L-1 progesterone hormone in aqueous solution under polychromatic irradiation for 3h. The studies on degradation were investigated under electrochemically assisted heterogeneous photocatalysis (EHP) conditions. For photodegradation of progesterone, higher performance was achieved when WO3 was functionalized and when the EHP configuration was adopted with bias at +0.7 V vs Ag/AgCl. This study reveals that incorporation of metallic NPs onto a semiconductor increases its efficiency, thereby preventing electron-hole recombination in the photocatalyst and photoelectrochemical limitations of WO3 due to surface plasmon resonance and the trapping state. Therefore, efficient advances in the degradation of organic contaminants during water treatment can be realized. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs