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• W4292553548 abstract "Zinc oxide (ZnO) nanostructures have emerged as efficient heterogeneous photocatalysts for the degradation of organic pollutants in aqueous solutions and industrial wastewaters. In this work, a simple and effective method is reported for the synthesis of zinc oxide/zinc hydroxide (ZnO/Zn(OH) 2 ) hybrid nanoparticles using a mineral acid to enhance the photocatalytic activity of ZnO. Infrared spectroscopy reveals the presence of hydroxyl groups in ZnO/Zn(OH) 2 nanoparticles. X-ray diffraction shows the formation of hexagonal wurtzite ZnO nanoparticles, which retain their wurtzite structure after acid treatment but additional diffractions for Zn(OH) 2 are also recorded. The optical bandgap of resulting ZnO and ZnO/Zn(OH) 2 nanoparticles is reduced to 3.05 and 3.08 eV, respectively. In the initial photocatalysis experiments, ZnO/Zn(OH) 2 nanoparticles exhibit 3.5-times improved degradation and removal of sunset yellow dye, a model organic pollutant, from deionized water compared to pristine ZnO nanoparticles. Hence, for further studies, ZnO/Zn(OH) 2 coatings are fabricated on glass slides with a uniform surface morphology as shown by the atomic force microscopy. The time-dependent UV-visible spectroscopy reveals the photocatalytic degradation of sunset yellow over the surface of ZnO/Zn(OH) 2 coatings. The degradation reaction follows the pseudofirst-order mechanism with a rate constant of 2.9 × 10 –2 min −1 . The recyclability and stability experiments reveal the retention of appreciable photocatalytic activity of ZnO/Zn(OH) 2 coatings (with &gt;92% degradation efficiency after six successive cycles). The results are compared with recent examples from the pertinent literature. The surface hydroxyl groups on ZnO/Zn(OH) 2 nanoparticles and bandgap lowering enhance the anchoring of dye molecules and electron transfer reactions." @default.
• W4292553548 created "2022-08-22" @default.
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• W4292553548 date "2022-08-22" @default.
• W4292553548 modified "2023-09-29" @default.
• W4292553548 title "ZnO/Zn(OH)2 nanoparticles and self-cleaning coatings for the photocatalytic degradation of organic pollutants" @default.
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• W4292553548 doi "https://doi.org/10.3389/fenvs.2022.965925" @default.
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