Synthesis of A-position Ba-doped Perovskite LaCoO_(3) and Performance of Photocatalytic Phenol Degradation  

A位钡掺杂钙钛矿型LaCoO_(3)光催化剂制备及其光催化降解苯酚性能

作　　者：YUAN Li-jing ZHAO Kun-feng SONG Jin GUO Shi-long GUO Jia-le WANG Yan MENG Xian-jie WEI Xian-xian LIU Zhen-min WANG Xiao-xiao 袁利静;赵坤峰;宋金;郭世龙;郭佳乐;王艳;孟现洁;卫贤贤;刘振民;王潇潇(太原科技大学能源与材料工程学院,山西太原030024;交通运输部东海航海保障中心温州航标处,浙江温州325000;太原科技大学化学工程与技术学院,山西太原030024;太原理工大学化学工程与技术学院,山西太原030024;太原科技大学环境与资源学院,山西太原030024)

机构地区：[1]School of Energy&Materials Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China [2]Wenzhou Aids to Navigation Division,Donghai Navigation Safety Administration(DNSA),Wenzhou 035000,China [3]School of Chemical Engineering and Technology,Taiyuan University of Science and Technology,Taiyuan 030024,China [4]College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,China [5]School of Environment and Resources,Taiyuan University of Science and Technology,Taiyuan 030024,China

出　　处：《分子催化（中英文）》2024年第6期510-520,I0001,I0002,共13页Journal of Molecular Catalysis(China)

基　　金：The Fundamental Research Program for Young Scientists of Shanxi Province(Project No.202103021223294);The Fundamental Research Program of Shanxi Province(Project No.202203021211203);The Start-up Fund for Doctorate Scientific Research Project of Taiyuan University of Science and Technology(Project No.20232124);The Innovation and Entrepreneurship Training Program for Undergraduate,Taiyuan University of Science and Technology(Project No.DCX2024162).

摘　　要：The utilization of perovskite oxide materials as catalysts for the photodegradation of organic pollutants in water is a promising and rapidly advancing field.In this study,a series of La_(1−x)Ba_(x)CoO_(3)(x=0.2,0.3,0.4,0.5,0.6)catalysts with varying Ba doping ratios were synthesized using the citric acid complexation-hydrothermal synthesis combined method for the degradation of phenol under visible light irradiation.Among the synthesized catalysts,La_(0.5)Ba_(0.5)CoO_(3) exhibited the highest photocatalytic activity.In addition,the photocatalytic mechanism for La_(0.5)Ba_(0.5)CoO_(3) perovskite degradation of phenol was also discussed.The synthesized catalysts were characterized using XRD,SEM,FT-IR,XPS,MPMS and other characterization techniques.The results revealed that the diffraction peak intensity of La_(1−x)Ba_(x)CoO_(3) increased with higher Ba doping ratios,and the La_(0.4)Ba_(0.6)CoO_(3) exhibited the strongest diffraction peaks.The catalyst particle sizes ranged from 10 to 50 nm,and the specific surface area decreased with increasing Ba content.Additionally,the paramagnetic properties of La_(0.5)Ba_(0.5)CoO_(3) were similar to that of La_(0.4)Ba_(0.6)CoO_(3).The experimental results suggested that the incorporation of Ba could significantly improve the catalytic performance of La_(1−x)Ba_(x)CoO_(3) perovskites,promote electron transfer and favor to the generation of hydroxyl radicals(•OH),leading to the efficiently degradation of phenol.钙钛矿氧化物材料作为光催化降解水中有机污染物催化剂的应用是一个前景广阔且快速发展的领域.本文采用柠檬酸配合-水热合成相结合的方法合成出一系列不同Ba掺杂比的La_(1−x)Ba_(x)CoO_(3)(x=0.2,0.3,0.4,0.5,0.6)钙钛矿型光催化剂,并考察其在可见光下光催化降解苯酚的催化性能.实验结果表明La_(0.5)Ba_(0.5)CoO_(3)表现出最高的光催化性能.此外,还讨论了La_(0.5)Ba_(0.5)CoO_(3)的光催化机理.通过X射线衍射(XRD)、扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)、X射线电子能谱(XPS)、磁性测量系统(MPMS)等多种表征技术对合成的催化剂进行全面表征,结果表明,La_(1−x)Ba_(x)CoO_(3)的衍射峰强度随着Ba掺杂比的增加而增强,其中La_(0.4)Ba_(0.6)CoO_(3)的衍射峰最强.催化剂颗粒大小范围为10~50 nm,且随着Ba含量的增加,比表面积逐渐降低.此外,La_(0.5)Ba_(0.5)CoO_(3)和La_(0.4)Ba_(0.6)CoO_(3)的顺磁性特征非常相似.实验结果表明,Ba的掺杂可以显著增强La_(1−x)Ba_(x)CoO_(3)钙钛矿的催化性能,促进电子循环和羟基自由基(•OH)的生成,从而有效降解苯酚.

关 键 词：perovskite catalyst La_(1−x)Ba_(x)CoO_(3) PHOTOCATALYSIS phenol degradation mechanism 

分 类 号：O643.32[理学—物理化学]