介孔MnO2 超结构的合成及其性能

Abstract

Abstract: Mesoporous manganese dioxide (MnO₂) has been synthesized successfully by means of a facile and environmental friendly method by virtue of a soft interface between CH₂Cl₂ and H₂O without templates. It’s thermostability has also been investigated. X-ray diffraction spectroscopy, Fourier transform infrared spectroscopy analysis, scanning electron microscopy, transmission electron microscopy and an automatic surface area or pore size analyzer were applied to investigate the composition and microstructure of the as-synthesized MnO₂. As a result, the as-prepared MnO₂ was proven to be a mixture of e-MnO₂ and y-MnO₂ using X-ray diffraction techniques. The structure characterizations indicated a unique mesoporous structure of as-prepared MnO₂ composed of hollow MnO₂ sub-microspheres with thorns at surface. Nitrogen sorption analyses show that the as-synthesized MnO₂ has an adsorption average pore diameter of 5.9 nm, mesoporous volume of 0.451 cm³.g−1, and Brunauer Emmett Teller specific surface area of 322.5 m²/g. The as-synthesized MnO₂ which has undergone the heat treatment of temperature lower than 400 ^oC, appears crystal change without change of composition. It would keep the microstructure of hollow MnO₂ sub-microspheres. Howerver, heat treatment of 500 ^oC can turn the MnO₂ to pure Mn₂O₃ along with it’s microstructure’s collapse. Otherwise,the possible growth mechanism of mesoporous MnO₂ has been proposed. In brief, high surface area Mesoporous MnO₂ with a novel and stable superstructure has been obtained by the facile interfacial method.

Key words: growth mechanism, H2O/CH2Cl2 soft interface, mesoporous MnO2, superstructure, theromostability

CLC Number:

TQ 137

LIU Yan-yu, WANG Li-jun, HOU Ling-gui, WANG Wen-feng, CHEN Zhi-wen. Superstructures and Properties of Mesoporous MnO₂Synthesized by a Facile Interface Method[J]. Journal of Shanghai University（Natural Science Edition）, 2013, 19(4): 405-410.

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Superstructures and Properties of Mesoporous MnO₂Synthesized by a Facile Interface Method

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Superstructures and Properties of Mesoporous MnO₂Synthesized by a Facile Interface Method