A novel n-CeO2/n-CdO heterojunction nanocomposite for enhanced photodegradation of organic pollutants under visible light irradiation  

作　　者：Karunamoorthy Saravanakumar Subramani Muthupoongodi Velluchamy Muthuraj 

机构地区：[1] Department of Chemistry,V.H.N.S.N College,Virudhunagar,626 001,Tamilnadu,India [2] Department of Chemistry,Sri Kaliswari College,Sivakasi,626 130,Tamilnadu,India [3] Department of Chemistry,Thiagarajar College,Madurai,625 009,Tamilnadu,India

出　　处：《Journal of Rare Earths》2019年第8期853-860,I0003,共9页稀土学报（英文版）

摘　　要：In this study,a series of novel visible light driven n-CeO2/n-CdO heterojunction(CeO2/CdO)nanoco mposites we re successfully fabricated by simple ultrasonication method.Several characte rization tools including X-ray diffraction(XRD),scanning electro n microscopy(SEM),transmission electron microscopy(TEM)and UV-vis diffuse reflectance spectroscopy(UV-DRS),etc.,were utilized to investigate the physicochemical properties of the catalyst and confirm the formation of heterojunction.Under visible light irradiations,the photocatalytic activities of the as-prepared CeO2/CdO nanocomposites were evaluated by degrading of Congo red(CR)and Rhodamine B(RhB)solutions.As a result,the CeO2/CdO(mass percentage ratio 1:3)nanocomposite displays remarkable performance for CR and RhB degradation.The enhancement in the photocatalytic performance of CeO2/CdO(1:3)nanocomposite can be attributed not only to the strong visible-light absorption region,separating the photogenerated electronhole pairs but also to the formation of n-n type heterojunction.The results also indicate that the CeO2/CdO(1:3)nanocomposite has good stabilization and high reusability.In addition,the mechanism is proposed for the coupled semiconductors and possible reasons for the enhancement of visible-light photocatalytic efficiency are also discussed.This work can provide a new gateway to fabricate visible photocatalysts and promising candidate catalysts for poisonous wastewater treatment in the near future.In this study,a series of novel visible light driven n-CeO2/n-CdO heterojunction（CeO2/CdO）nanoco mposites we re successfully fabricated by simple ultrasonication method.Several characte rization tools including X-ray diffraction（XRD）,scanning electro n microscopy（SEM）,transmission electron microscopy（TEM）and UV-vis diffuse reflectance spectroscopy（UV-DRS）,etc.,were utilized to investigate the physicochemical properties of the catalyst and confirm the formation of heterojunction.Under visible light irradiations,the photocatalytic activities of the as-prepared CeO2/CdO nanocomposites were evaluated by degrading of Congo red（CR）and Rhodamine B（RhB）solutions.As a result,the CeO2/CdO（mass percentage ratio 1:3）nanocomposite displays remarkable performance for CR and RhB degradation.The enhancement in the photocatalytic performance of CeO2/CdO（1:3）nanocomposite can be attributed not only to the strong visible-light absorption region,separating the photogenerated electronhole pairs but also to the formation of n-n type heterojunction.The results also indicate that the CeO2/CdO（1:3）nanocomposite has good stabilization and high reusability.In addition,the mechanism is proposed for the coupled semiconductors and possible reasons for the enhancement of visible-light photocatalytic efficiency are also discussed.This work can provide a new gateway to fabricate visible photocatalysts and promising candidate catalysts for poisonous wastewater treatment in the near future.

关 键 词：n-CeO2/n-CdO HETEROJUNCTION Visible light PHOTOCATALYSIS PHOTODEGRADATION Rare earths 

分 类 号：O64[理学—物理化学]