{"title":"ZnO/Zn3(PO4)2/CeO2 photocatalysts formed on zinc by plasma electrolytic oxidation","authors":"Stevan Stojadinović , Ziv Radisavljevic , Zoran Petrović , Nenad Radić","doi":"10.1016/j.solidstatesciences.2024.107748","DOIUrl":null,"url":null,"abstract":"<div><div>ZnO/Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> coatings doped with CeO<sub>2</sub> particles for use in photocatalytic degradation of methyl orange (MO) were created by plasma electrolytic oxidation of zinc in a phosphate alkaline electrolyte (PAE) with CeO<sub>2</sub> particle concentrations of up to 1.5 g/L. The CeO<sub>2</sub> particle content in ZnO/Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> coatings was determined by the concentration of CeO<sub>2</sub> particles in the PAE. Extensive research was conducted on coating morphology, chemical and phase compositions, and light-harvesting properties. The photocatalytic activity (PA) of ZnO/Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/CeO<sub>2</sub> coatings was higher than ZnO/Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>. The PA of ZnO/Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/CeO<sub>2</sub> coatings strongly depends on the amount of CeO<sub>2</sub> particles in PAE, and the highest PA was observed for ZnO/Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/CeO<sub>2</sub> coating formed in PAE by adding 0.75 g/L of CeO<sub>2</sub> particles. The higher PA of ZnO/Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/CeO<sub>2</sub> compared to ZnO/Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> is due to a lower photogenerated electron/hole recombination. The photocatalytic degradation of MO followed a pseudo-first order kinetic model and the reaction constant of the most photoactive ZnO/Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/CeO<sub>2</sub> coating was increased about twofold compared to the ZnO/Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> coating. After 6 h of irradiation, the PA for ZnO/Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> and the most photocatalytically active ZnO/Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/CeO<sub>2</sub> was about 70 % and 98 %, respectively. A mechanism for the photodegradation of MO with the ZnO/Zn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/CeO<sub>2</sub> photocatalyst was also proposed.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":null,"pages":null},"PeriodicalIF":3.4000,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solid State Sciences","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1293255824003133","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
ZnO/Zn3(PO4)2 coatings doped with CeO2 particles for use in photocatalytic degradation of methyl orange (MO) were created by plasma electrolytic oxidation of zinc in a phosphate alkaline electrolyte (PAE) with CeO2 particle concentrations of up to 1.5 g/L. The CeO2 particle content in ZnO/Zn3(PO4)2 coatings was determined by the concentration of CeO2 particles in the PAE. Extensive research was conducted on coating morphology, chemical and phase compositions, and light-harvesting properties. The photocatalytic activity (PA) of ZnO/Zn3(PO4)2/CeO2 coatings was higher than ZnO/Zn3(PO4)2. The PA of ZnO/Zn3(PO4)2/CeO2 coatings strongly depends on the amount of CeO2 particles in PAE, and the highest PA was observed for ZnO/Zn3(PO4)2/CeO2 coating formed in PAE by adding 0.75 g/L of CeO2 particles. The higher PA of ZnO/Zn3(PO4)2/CeO2 compared to ZnO/Zn3(PO4)2 is due to a lower photogenerated electron/hole recombination. The photocatalytic degradation of MO followed a pseudo-first order kinetic model and the reaction constant of the most photoactive ZnO/Zn3(PO4)2/CeO2 coating was increased about twofold compared to the ZnO/Zn3(PO4)2 coating. After 6 h of irradiation, the PA for ZnO/Zn3(PO4)2 and the most photocatalytically active ZnO/Zn3(PO4)2/CeO2 was about 70 % and 98 %, respectively. A mechanism for the photodegradation of MO with the ZnO/Zn3(PO4)2/CeO2 photocatalyst was also proposed.
期刊介绍:
Solid State Sciences is the journal for researchers from the broad solid state chemistry and physics community. It publishes key articles on all aspects of solid state synthesis, structure-property relationships, theory and functionalities, in relation with experiments.
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