现代化工

现代化工 ›› 2022, Vol. 42 ›› Issue (12) : 235-241. DOI: 10.16606/j.cnki.issn0253-4320.2022.12.042

科研与开发

LaFe_1-xMn_xO₃钙钛矿催化臭氧氧化降解间甲酚的研究

姜鑫, 武春艳, 邵天华, 王盛哲, 卫皇曌, 赵颖, 孙承林

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Study on ozonation degradation of m-cresol catalyzed by LaFe_1-xMn_xO₃ perovskite

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Received		Published
2021-12-24		2022-12-20
Issue Date	Revised Date
2022-12-23	2021-12-24

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摘要

利用改进的共沉淀法合成了一系列不同铁锰掺杂比的LaFe_1-xMn_xO₃钙钛矿催化剂。以间甲酚为模拟污染物,评估合成的LaFe_1-xMn_xO₃钙钛矿催化剂的催化臭氧氧化活性,并对合成条件进行优化,在最佳合成条件下探究铁锰掺杂比的影响。通过SEM、XRD、TEM mapping对材料形貌结构进行表征,通过O₂-TPD对催化剂氧空位进行研究,并结合GC-MS和HPLC-MS推测了间甲酚反应的降解过程。结果表明,LaFe_0.26Mn_0.74O₃催化剂具有最佳的催化效果;LaFe_0.26Mn_0.74O₃催化剂具有很好的稳定性;同时盐度对于间甲酚的降解有一定的抑制作用。

Abstract

A series of LaFe_1-xMn_xO₃ perovskite catalysts with different Fe/Mn doping ratios are synthesized via an improved coprecipitate method.M-cresol is taken as a simulated pollutant to evaluate the catalytic ozonation activity of the synthesized LaFe_1-xMn_xO₃.After optimizing the synthesis conditions,the effect of Fe/Mn doping ratio is investigated under the optimum synthesis conditions.The morphology and structure of the catalyst are studied by means of SEM,XRD and TEM mapping,and its oxygen vacancy is studied through O₂-TPD.The degradation process of m-cresol is speculated by means of GC-MS and HPLC-MS.The results indicate that LaFe_0.26Mn_0.74O₃ catalyst has the best catalytic effect and a good stability.Meanwhile,the salinity has a certain inhibition on the degradation of m-cresol.