A位钡掺杂钙钛矿型LaCoO3光催化剂制备及其光催化降解苯酚性能
Synthesis of A-position Ba-doped Perovskite LaCoO3 and Performance of Photocatalytic Phenol Degradation
袁利静 1赵坤峰 2宋金 3郭世龙 3郭佳乐 3王艳 3孟现洁 4卫贤贤 5刘振民 3王潇潇3
作者信息
- 1. 太原科技大学能源与材料工程学院,山西太原 030024
- 2. 交通运输部东海航海保障中心温州航标处,浙江温州 325000
- 3. 太原科技大学化学工程与技术学院,山西太原 030024
- 4. 太原理工大学化学工程与技术学院,山西太原 030024
- 5. 太原科技大学环境与资源学院,山西太原 030024
- 折叠
摘要
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La1-xBaxCoO3(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La0.5Ba0.5CoO3 表现出最高的光催化性能.此外,还讨论了La0.5Ba0.5CoO3 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,La1-xBaxCoO3 的衍射峰强度随着Ba掺杂比的增加而增强,其中La0.4Ba0.6CoO3 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,La0.5Ba0.5CoO3 和La0.4Ba0.6CoO3 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La1-xBaxCoO3 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.
Abstract
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 La1-xBaxCoO3(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,La0.5Ba0.5CoO3 exhibited the highest photocatalytic activity.In addition,the photocatalytic mechanism for La0.5Ba0.5CoO3 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 La1-xBaxCoO3 increased with higher Ba doping ratios,and the La0.4Ba0.6CoO3 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 La0.5Ba0.5CoO3 were similar to that of La0.4Ba0.6CoO3.The experimental results suggested that the incorporation of Ba could significantly improve the catalytic performance of La1-xBaxCoO3 perovskites,promote electron transfer and favor to the generation of hydroxyl radicals(·OH),leading to the efficiently degradation of phenol.
关键词
钙钛矿催化剂/La1-xBaxCoO3/光催化/苯酚降解/机理Key words
perovskite catalyst/La1-xBaxCoO3/photocatalysis/phenol degradation/mechanism引用本文复制引用
出版年
2024
NETL
NSTL
万方数据