钙钛矿型催化剂LaCoO_(3)的制备及其光催化降解酸性红B的研究  

Preparation of perovskite type catalyst LaCoO_(3) andits photocatalytic degradation of acid red B

作　　者：牛紫嫣 梁佳雄 李薇 郝凌暾 姚舜予 傅梦圆 乔枫瑞 王晋 刘振民[1] 王潇潇[1] NIU Ziyan;LIANG Jiaxiong;LI Wei;HAO Linghuang;YAO Shunyu;FU Mengyuan;QIAO Fengrui;WANGJin;LIU Zhenmin;WANG Xiaoxiao(School of chemistry and Bioengineering, Taiyuan University of science and technology, Taiyuan 030024,China)

机构地区：[1]太原科技大学化学与生物工程学院,太原030024

出　　处：《功能材料》2022年第2期2101-2106,共6页Journal of Functional Materials

基　　金：山西省高等学校大学生创新创业训练计划项目(20210492,20210493);太原科技大学大学生创新创业训练计划项目(XJ2020045,XJ2021047,XJ2021051);山西省重点研发计划项目(201903D121025);山西省青年科技研究基金项目(201901D211584)。

摘　　要：采用水热合成法制备4种比例不同的钙钛矿型复合金属氧化物钴酸镧催化剂,La(NO_(3))_(2)、Co(NO_(3))_(2)、柠檬酸之间的比例分别为1∶1∶3、1∶1∶4、1∶1∶5、1∶1∶6。采用XRD、SEM、TEM等技术对催化剂进行结构表征及性能测试。以酸性红B为研究对象,以氙灯模拟太阳光照射下降解酸性红B染料废水。结果表明,4种催化剂对酸性红B的降解率均达到80%以上,而比例为1∶1∶6时的LaCoO_(3)催化剂对酸性红B的降解效果最好,在20℃下可见光照射1 h后降解率达到88.52%。通过研究发现,制备出较大比表面积的钴酸镧催化剂对酸性红B的光催化降解效果最好,反之比表面积小的降解效果差。4种比例的钴酸镧催化剂对酸性红B的降解符合一级反应动力学方程。In this paper,four perovskite type composite metal oxide lanthanum cobaltate catalysts with different ratios are prepared by hydrothermal synthesis.The ratios of La(NO_(3))_(2),Co(NO_(3))_(2) and citric acid are 1∶1∶3,1∶1∶4,1∶1∶5 and 1∶1∶6,respectively.The structure and properties of the catalyst are characterized by XRD,SEM and TEM.Acid red B is used as the research object.Xenon lamp is used to simulate the degradation of acid red B dye wastewater under sunlight.The results show that the degradation rates of acid red B by the four catalysts are more than 80%,while the LaCoO_(3)catalyst with the ratio of 1∶1∶6 has the best degradation effect on acid red B,and the degradation rate reaches 88.52%after visible light irradiation at 20℃for 1 h.It is found that lanthanum cobaltate catalyst with large specific surface area has the best photocatalytic degradation effect on acid red B,on the contrary,the degradation effect of lanthanum cobaltate catalyst with small specific surface area is poor.The degradation of acid red B by four ratios of lanthanum cobaltate catalysts accords with the first-order reaction kinetic equation.

关 键 词：钙钛矿 钴酸镧 催化剂 光催化 酸性红B 

分 类 号：O644[理学—物理化学]