Influences of CeO_(2)morphology on enhanced performance of electro-Fenton for wastewater treatment  

作　　者：Jingjing Hu Bei Wu Lei Chen Chengcheng Song Huifang Yang Fei Long Jie Sun Ru'an Chi 

机构地区：[1]Hubei Novel Reactor&Green Chemical Technology Key Laboratory,Key Laboratory for Green Chemical Process of Ministry of Education,Xingfa School of Mining Engineering,Wuhan Institute of Technology,Wuhan 430073,China [2]Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission&Ministry of Education,Hubei Province,College of Resource and Environmental Science,South-Central University for Nationalities,Wuhan 430074,China

出　　处：《Journal of Rare Earths》2022年第12期1870-1877,I0002,共9页稀土学报（英文版）

基　　金：Project supported by Key R&D Program of Hubei Province(2020BCB062);Fundamental Research Funds for the Central Universities(CZP20005,CZQ21028)。

摘　　要：As a kind of rare-earth oxide,CeO_(2)has been considered as a great potential material for its abundant oxygen vacancies and catalysis activity in wastewater treatment.In this study,three ceria samples with different morphological structure were prepared,and their effect on contaminates degradation in electro-Fenton(E-Fenton)system was investigated.It is found that the morphology of CeO_(2)has great influence on promoting the performance of E-Fenton process.The rod-like CeO_(2)(R-CeO_(2))induced EFenton system shows higher azo dye X3 B removal and mineralization rates than cubs(C-CeO_(2))and octahedrons(O-CeO_(2)),and the degradation kinetic rate constants are 0.28,0.169 and 0.181 min^(-1)respectively,already surpass that of the blank one(0.120 min^(-1)).The H_(2)O_(2)generation capacity of R-CeO_(2)induced E-Fenton system is also superior to the others,and the corresponding Faraday current efficiency even increases to 166.2%at 2.5 min.Characterizations by scanning-transmission electron microscopy(STEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),electron spin resonance(ESR),Raman spectroscopy were conducted to disclose the mystery behind this phenomenon.The results indicate that the difference of surface oxygen vacancy density in different shaped CeO_(2)acts as a magic driving force for the accelerated oxygen reduction,and then leads to the enhanced degradation efficiency of E-Fenton system.This work provides a new insight into the development and application of rare-earth elements based catalyst in E-Fenton technology.

关 键 词：CeO_(2) ELECTRO-FENTON Current efficiency Exposed facets H_(2)O_(2) MORPHOLOGY 

分 类 号：O643.36[理学—物理化学] X703[理学—化学]