Selective Synthesis of Manganese Dioxide Polymorphs by the Hydrothermal Treatment of Aqueous KMnO4 Solutions

被引：11
|
作者：
Egorova, A. A. [1 ]
Bushkova, T. M. [1 ]
Kolesnik, I. V. [2 ]
Yapryntsev, A. D. [1 ]
Kottsov, S. Yu. [1 ,2 ]
Baranchikov, A. E. [1 ]
机构：
[1] Russian Acad Sci, Kurnakov Inst Gen & Inorgan Chem, Moscow 119991, Russia
[2] Moscow MV Lomonosov State Univ, Moscow 119991, Russia
来源：
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY | 2021年 / 66卷 / 02期
基金：
俄罗斯科学基金会;
关键词：
hydrothermal synthesis; potassium permanganate; cryptomelane; birnessite; pyrolusite; hollandite; SOLID-STATE SYNTHESIS; ALPHA-MNO2; NANOWIRES; PHASE-TRANSFORMATION; MNO2; ELECTRODE; NANOSTRUCTURES; BETA-MNO2; CRYPTOMELANE; BIRNESSITE; SPECTRA;
D O I：
10.1134/S0036023621020066
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The hydrothermal treatment of neutral and acidified KMnO4 solutions at concentration of 0.037-0.093 mol/L and temperature of 120, 170, and 220 degrees C for 24 h leads to selective synthesis of three different manganese dioxide modifications: alpha-MnO2, delta-MnO2, and beta-MnO2. The temperature of hydrothermal treatment and medium acidity has been shown to affect considerably the phase composition of KMnO4 reduction products and reaction yield. The obtained samples of MnO2 have been characterized by X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and diffuse reflectance spectroscopy.
引用
收藏
页码：146 / 152
页数：7
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