化工新型材料

化工新型材料 ›› 2024, Vol. 52 ›› Issue (7) : 228-233. DOI: 10.19817/j.cnki.issn1006-3536.2024.07.054

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二氧化锰的晶型控制及其对罗丹明B的降解研究

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Study on the crystal form control of manganese dioxide and its degradation for rhodamine B

Wang Shumin¹, Gao Yongkang¹, Guo Yachun¹, Gao Yixing², Peng Xue¹, Luo Cong¹, Zhang Tianhao¹

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Received		Published
2023-10-13		2024-07-20
Issue Date	Revised Date
2024-07-24	2023-10-13

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摘要

以高锰酸钾、四水氯化锰和少量浓盐酸为原料,利用水热法实现了MnO₂由α晶型向γ晶型再向β晶型的转变,采用X射线衍射(XRD)、X射线光电子能谱(XPS)和扫描电镜(SEM)等表征方法分析了MnO₂的晶型转化机理。利用高级氧化法以制备的MnO₂为催化剂对罗丹明B(RhB)进行了催化降解研究,探寻了催化效果最好的MnO₂晶型并推理出RhB的降解路径。结果表明:随着水热反应时间的延长,α-MnO₂逐渐向具有较小隧道尺寸的γ-MnO₂、β-MnO₂转变;3种晶型的MnO₂活化PMS对RhB均具有显著的降解效果,降解效率为α-MnO₂>γ-MnO₂>β-MnO₂;紫外-可见吸收光谱分析说明MnO₂活化PMS降解RhB的路径为RhB先经过逐步脱乙基化转变成罗丹明、再生成其他有机小分子、CO₂和H₂O。

Abstract

The transformation of MnO₂ from α form to γ form and then to β form was realized by hydrothermal method with potassium permanganate,manganese chloride tetrachloride and a small amount of concentrated hydrochloric acid as the main raw materials.XRD,XPS and SEM methods were used to analyze the crystal transformation of MnO₂.The catalytic degradation of Rhodamine B (RhB) was studied by advanced oxidation method with the prepared MnO₂ as catalyst.The MnO₂ crystal form with best catalytic effect was explored and the degradation mechanism of RhB was deduced.The results showed that with the extension of hydrothermal reaction time,α-MnO₂ gradually transformed to γ-MnO₂ and β-MnO₂ with smaller tunnel sizes.The three types of MnO₂-activated PMS exhibited significant degradation effects on RhB,and the degradation efficiency was α-MnO₂>γ-MnO₂>β-MnO₂.According to UV-visible absorption spectrum analysis,the degradation pathway of RhB by MnO₂-activated PMS was that RhB was firstly deethylated to convert into rhodamine,and then transformed into other small molecules,CO₂ and H₂O.

关键词

二氧化锰 / 晶型转化 / 高级氧化法 / 过硫酸氢钾 / 降解路径

Key words

manganese dioxide / crystal transformation / advanced oxidation method / potassium peroxymonosulfate / degradation pathway

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二氧化锰的晶型控制及其对罗丹明B的降解研究[J]. 化工新型材料, 2024, 52(7): 228-233 DOI:10.19817/j.cnki.issn1006-3536.2024.07.054

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