在水溶液中由放电引起的锰离子参与的氧化还原过程

IF 0.6 Q4 CHEMISTRY, MULTIDISCIPLINARY

Izvestiya Vysshikh Uchebnykh Zavedenii Khimiya i Khimicheskaya Tekhnologiya Pub Date : 2018-10-22 DOI:10.6060/ivkkt20186109-10.5802

D. Shutov, A. V. Sungurova, K. Smirnova, A. Manukyan, V. Rybkin

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引用次数: 4

摘要

本文分析了大气压直流电在空气中放电引发水溶液中Mn7+离子（MnO4-）氧化还原动力学的实验研究结果。高锰酸钾溶液用作放电阴极。Mn7+离子的初始溶液浓度范围为（0.44-2.5）mmol/l，放电电流为（20-60）mA。发现放电作用导致Mn7+的还原和溶液变色。同时，形成了尺寸为0.1μm至20μm的深色固体颗粒。X射线衍射分析表明颗粒为无定形，能量色散X射线分析表明粉末为氧化锰（IV）。测定了Mn7+离子的还原氧化动力学。结果表明，以最佳方式（测定系数R2≈0.99）获得的Mn7+离子还原动力学数据可以用方案X描述↔Y↔Z、其中X是起始材料并且Y和Z是反应产物。在该方案的基础上对动力学曲线进行处理，得到了相应阶段的有效速率常数。研究发现，有效速率常数取决于溶液的初始浓度。在20mA的放电电流下，浓度从0.44增加到2.5mol/l导致Mn7+离子还原的速率常数分别从（2.48±0.5）·10-2降低到（7.2±1.5）·10-3s-1。讨论了过程的可能机制。假设参与锰离子还原的氧化反应的主要颗粒是H2O2、HO2、OH和在放电作用下在溶液中形成的溶剂化电子。引文：Shutov D.A.、Sungurova A.V.、Smirnova K.V.、Manukyan A.S.、Rybkin V.V.水溶液中放电引发的锰离子参与的氧化还原过程。伊兹夫。维什。Uchebn。扎维德。Khim。Khim。Tekhnol。2018年第61条。N 9-10。第23-29页

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OXIDATIVE-REDUCING PROCESSES WITH PARTICIPATION OF MANGANESE IONS INITIATED BY AN ELECTRIC DISCHARGE IN AQUEOUS SOLUTION

The results of experimental studies of the kinetics of oxidation-reduction of Mn7+ ions (MnO4-) in aqueous solutions initiated by the action of a discharge of a direct current of atmospheric pressure in air are analyzed in the article. A solution of potassium permanganate served as a discharge cathode. The range of initial solution concentrations for Mn7+ ions was (0.44-2.5) mmol/l, and discharge currents (20-60) mA. It was found that the discharge action leads to the reduction of Mn7+ ions and discoloration of the solution. At the same time, dark solid particles with a size of 0.1 μm to 20 μm are formed. X-ray diffraction analysis showed that the particles are amorphous, and energy dispersive X-ray analysis showed that the powder is manganese oxide (IV). The kinetics of reduction-oxidation of Mn7+ ions is measured. It is shown that the obtained data on the kinetics of the reduction of Mn7+ ions in the best way (the determination coefficient R2≈0.99) can be described by the scheme X↔Y↔Z, where X is the starting material, and Y and Z are the reaction products. The processing of kinetic curves on the basis of this scheme found the effective rate constants of the corresponding stages. It was found that the effective rate constants depend on the initial concentration of the solution. At a discharge current of 20 mA, an increase in the concentration from 0.44 to 2.5 mol/l led to a decrease in the rate constant for the reduction of Mn7+ ions from (2.48 ± 0.5) ·10-2 to (7.2 ± 1.5) ·10-3 s-1, respectively. Possible mechanisms of processes are discussed. It is assumed that the main particles involved in the oxidation reactions of the reduction of manganese ions are H2O2, HO2, OH and solvated electrons that are formed in the solution under the action of a discharge. For citation: Shutov D.A., Sungurova A.V., Smirnova K.V., Manukyan A.S., Rybkin V.V. Oxidative-reducing processes with participation of manganese ions initiated by electric discharge in aqueous solution. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 9-10. P. 23-29

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来源期刊

Izvestiya Vysshikh Uchebnykh Zavedenii Khimiya i Khimicheskaya Tekhnologiya CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

1.40

自引率

44.40%

发文量