Liu Guo
2010
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Journal
Journal of Beijing University of Chemical Technology
Abstract
Magnesium trisilicate was synthesized by precipitation using Na2O·nSiO2 and Mg(NO3)2 as raw materials.The precipitate was heated at 450℃ or activated by H2SO4,after which the samples were characterized by BET,pyridine adsorption and methylene blue adsorption to check the effect of method of mixing,calcination and acidic activation on the porous structure,surface acidity and adsorption properties.The results showed that the sample which was synthesized by addition of Mg(NO3)2 to the sodium silicate solution was microporous with a specific surface area of 568.93m2/g,a pore capacity of 0.3542cm3/g and exhibited a multimodal pore width distribution in the 1-3nm and 0.7-0.9nm micropore regions.The sample which was synthesized by addition of the sodium silicate solution to Mg(NO3)2 solution was mesoporous with a specific surface area of 179.40m2/g and a pore capacity of 0.8350cm3/g.Calcination and acidic activation increased the surface acidity,reduced the specific surface area and changed the distribution of pore width.The porous structure and the quantity,type and strength of surface acidity all affect the adsorption properties of the material.