CeO2 for Water Remediation: Comparison of Various Advanced Oxidation Processes

Catalysts

Giuliana Impellizzeri¹  Vittorio Privitera¹  ElenaMaria Scalisi²  MariaVioletta Brundo²  Roberta Pecoraro²  Roberto Fiorenza³  Salvatore Sciré³  Luisa D’Urso³  StefanoAndrea Balsamo³ 

[1] CNR-IMM, Via S. Sofia 64, 95123 Catania, Italy;Department of Biological, Geological and Environmental Science, University of Catania, Via Androne 81, 95124 Catania, Italy;Department of Chemical Sciences, University of Catania, Viale A. Doria 6, 95125 Catania, Italy;

关键词: ceria;    pesticide;    photocatalysis;    photo-Fenton;    AOPs;   

DOI  :  10.3390/catal10040446

来源: DOAJ

【 摘 要 】

Three different Advanced Oxidation Processes (AOPs) have been investigated for the degradation of the imidacloprid pesticide in water: photocatalysis, Fenton and photo-Fenton reactions. For these tests, we have compared the performance of two types of CeO₂, employed as a non-conventional photocatalyst/Fenton-like material. The first one has been prepared by chemical precipitation with KOH, while the second one has been obtained by exposing the as-synthetized CeO₂ to solar irradiation in H₂ stream. This latter treatment led to obtain a more defective CeO₂ (coded as “grey CeO₂”) with the formation of Ce³⁺ sites on the surface of CeO₂, as determined by Raman and X-ray Photoelectron Spectroscopy (XPS) characterizations. This peculiar feature has been demonstrated as beneficial for the solar photo–Fenton reaction, with the best performance exhibited by the grey CeO₂. On the contrary, the bare CeO₂ showed a photocatalytic activity higher with respect to the grey CeO₂, due to the higher exposed surface area and the lower band-gap. The easy synthetic procedures of CeO₂ reported here, allows to tune and modify the physico-chemical properties of CeO_2, allowing a choice of different CeO₂ samples on the basis of the specific AOPs for water remediation. Furthermore, neither of the samples have shown any critical toxicity.

【 授权许可】

Unknown