Liquid-phase MnO2-modification of clinoptilolite


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Formation mechanism of the MnO2 phase in the reaction of heterogeneous synthesis between Mn2+ and MnO4-ions on a solid aluminosilicate surface in aqueous solutions was studied. It was shown that, for lowsilica forms, the Mn2+ ion is oxidized by the MnO4-ion uniformly across the grain depth to give the MnO2 phase and manganese manganites. For high-silica materials, the MnO2 phase is formed on the outer surface of grains, with the decomposition of the MnO4-ion and formation of the MnO2 phase and molecular oxygen. It was found that, for the clinoptilolite rock used as a solid support, the yield of the MnO2 phase and its distribution over the particle volume depend on the penetration capacity of the MnO4-ion into the porous structure of this rock, determined by its composition. It is shown that the amount of the MnO2 phase grows with increasing concentration of the MnO4-ion and treatment duration, with the phase thickness being 15–20 and 350–1050 μm for, respectively, high- and low-silica samples.

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A. Chechevichkin

St. Petersburg State Technological Institute (Technical University)

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Email: 01@6400840.ru
俄罗斯联邦, Moskovskii pr. 26, St. Petersburg, 190013

V. Samonin

St. Petersburg State Technological Institute (Technical University)

Email: 01@6400840.ru
俄罗斯联邦, Moskovskii pr. 26, St. Petersburg, 190013

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