S-doped ZnO photoelectrode modified with silver and platinum nanoparticles and their photocatalytic activity for progesterone degradation
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Journal of Molecular Structure
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Zinc oxide doped with sulfur (ZnO-S) has presented improved photocatalytic activity under visible irradiation. In this work, ZnO-S film was efficiently prepared by thermal decomposition from zinc sulfide (ZnS) in an oxidizing atmosphere. X-ray diffraction analysis (XRD) showed ZnS phase transformation occurred from cubic sphalerite to ZnO hexagonal wurtzite at temperatures between 500 and 600 °C. ZnO-S electrodes prepared onto a transparent conductive substrate were modified by silver (Ag0) or platinum (Pt0) nanoparticles (NPs). X-ray photoelectron spectroscopy (XPS) confirmed that sulfur was incorporated into ZnO structure. Field Emission Gun-Scanning Electron Microscope (FEG-SEM) images showed that occur a drastic modification in the particle morphology of the films treated at distinct temperatures. Photoelectrochemical investigation displayed a negative photopotential (∆E<0) for all photoelectrode investigated as well as superior photocurrents for samples modified with metallic Ag0 and Pt0 NPs. In order to investigate the photoelectroactivity, ZnO-S6, Ag0/ZnO-S6, Pt0/ZnO-S6 and commercial ZnO electrodes were used to degrade progesterone solution under polychromatic irradiation. The superior performances were observed for ZnO-S films functionalized with Ag0 or Pt0. Therefore, the results showed advances in the degradation of organic contaminants in the water treatment process and possible contributions to a better use of solar radiation.
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LUIS, JAILSON S.; EDUARDO, SAMUEL S.; COSTA, MARIA J.S.; BRANDAO-LIMA, LUCIANO C.; ANTUNES, RENATO A.; FERREIRA, RAPHAEL O.; SILVA, REJANE M.P.; SANTOS, REGINALDO S. S-doped ZnO photoelectrode modified with silver and platinum nanoparticles and their photocatalytic activity for progesterone degradation. Journal of Molecular Structure, v. 1305, p. 1-15, 2024. DOI: 10.1016/j.molstruc.2024.137764. Disponível em: https://repositorio.ipen.br/handle/123456789/48012. Acesso em: 30 Dec 2025.
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