期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 437, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2022.114427
关键词
Photocatalyst; Au; WO3 nanocomposite; Solar photocatalysis; Dyes degradation
This study investigated the loading of gold nanoparticles onto a tungsten trioxide support using a simple deposition technique and evaluated its efficiency and pathway for catalytic degradation of dye pollutants.
Gold nanoparticles (AuNPs) were loaded on tungsten trioxide (WO3) platelet-like support by a simple impreg-nation deposition technique at room temperature. Textural, structural and electrical properties were charac-terized for the as prepared material. The SEM/TEM investigations revealed that formed AuNPs possess a mean diameter of 7 nm and a preferential deposition on the (0 2 0) planes of the orthorhombic WO3 structure. The photodegradation efficiency was evaluated under solar light irradiation using dye pollutant solutions such as rhodamine B (RhB), methylene blue (MB) and methyl orange (MO). According to the affinity between the organic pollutant and the catalyst support, the adsorption/photocatalysis yield and the degradation pathway differ. It was observed that MB created strong electrostatic bonds with the catalyst support while RhB and MO did not adsorb on Au/WO3 hybrid sample. Photocatalytic tests revealed a high performance of Au/WO3 photocatalyst with a complete degradation in 90 min for a cationic dye mainly due to the oxidation by the hydroxyl reactive oxidant species. LC-MS analyses confirmed a higher decomposition with gold compared to bare WO3 on the MB pollutant and results permit to propose a degradation pathway.
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