CeO_(2)-Nb_(2)O_(5)photocatalysts for degradation of organic pollutants in water

作     者：Nathália Pereira Ferraz Andre Esteves Nogueira Francielle Candian Firmino Marcos Vanessa Aguiar Machado Rene Rojas Rocca Elisabete Moreira Assaf Yvan Jesus Olortiga Asencios Nathália Pereira Ferraz;André Esteves Nogueira;Francielle Candian Firmino Marcos;Vanessa Aguiar Machado;René Rojas Rocca;Elisabete Moreira Assaf;Yvan Jesus Olortiga Asencios

作者机构：Institute of Marine ScienceFederal University of Sao PauloSantosSP11030-100Brazil Brazilian Center for Research in Energy and Materials(CNPEM)CampinasSP13083-970Brazil Sao Carlos Institute of ChemistryUniversity of Sao PauloSao CarlosSP13566-590Brazil 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2020年第39卷第3期

页      面：230-240页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：the Sao Paulo Research Foundation(FAPESP)(for the financial support,Grant numbers 2014/24940-5,and 2017/01462-9) the Brazilian National Council for Scientific Development(CNPq)for the fellowship given to Nathalia P.Ferraz,and to the Brazilian Metals and Mining Company(CBMM). 

主　　题：Advanced oxidation process Photocatalysts Nb_(2)O_(5) CeO_(2) Phenol Methylene blue 

摘      要：The photocatalytic properties of CeO2-Nb2O5 photocatalysts in heterogeneous photocatalysis(under ultraviolet and visible radiation)and in Fenton-like process were reported.Methylene blue dye(MB)and phenol(Ph)were used as models of pollutant molecules for these reactions,and the photocatalysts were characterized by X-ray diffraction(XRD),diffuse reflectance spectroscopy(DRS),scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDX)and thermally stimulated luminescence(TL).The results indicated that the addition of CeO2(0.3 wt%,1.0 wt%and 2.0 wt%)to Nb2O5 sensitized the resultant materials,increasing light absorption in the visible region.However,there is a suitable formulation of CeO2-Nb2O5 photocatalysts to improve each photocatalytic process.In heterogeneous photocatalysis,the addition of small CeO2 quantities to Nb2O5 was enough to improve the photocatalytic activity of CeO2-Nb2O5 photocatalysts(The best composition reported was CeO20.3 wt%.).The effectiveness of the catalyst was explained by the decrease in the number of trapping and luminescence centers in the conduction band of the material after the addition of CeO2 to Nb2O5,but a large amount of CeO2 decreased the number of trapping,luminescent and active centers to a large extent.Contrarily,in a Fenton-like process,the addition of CeO2 to Nb2O5 was favorable in all the proportions studied.(The best composition was 2.0 wt%CeO2.)In this case,the effectiveness was explained by the influence of the adsorption process(adsorption-triggered process),and the interactions between H2 O2 and Ce3+of the CeO2 in each photocatalyst thus formed surface peroxide species O22-,which induced the removal of the organic molecules under visible light.