Preparation method of silicon dioxide molecular sieve

Abstract

The invention relates to a preparation method of a silicon dioxide molecular sieve, and belongs to the technical field of porous material preparation. The preparation method comprises the following steps: carrying out thermal treatment on silica fume, then carrying out particle classification and acid leaching treatment, filtering and cleaning; mixing the silica fume subjected to the acid leaching treatment, NaOH, a structure-directing agent and H2O in a molar ratio of SiO2 to NaOH to the structure-directing agent to H2O being 1: (0.2-0.4): (0.1-0.3): (150-200), reacting for 12-48 hours at the temperature of 90-120 DEG C, washing, filtering and drying, thus obtaining an organic-inorganic composite intermediate product; mixing the organic-inorganic composite intermediate product and water in a mass ratio being 1: (30-50), stirring, carrying out hydro-thermal treatment, washing, filtering and drying an obtained solid matter, then baking the obtained solid matter, and removing the structure-directing agent, thus obtaining the spherical mesoporous silicon dioxide molecular sieve. The preparation method has the advantages that the synthetic process and condition of the spherical mesoporous silicon dioxide molecular sieve are greatly simplified, the synthetic cost is reduced, and the prepared mesoporous material has excellent heavy metal adsorption property.

Description

technical field

[0001] The invention relates to a preparation method of silica molecular sieve, which belongs to the technical field of porous material preparation. Background technique

[0002] Since the scientists of Mobile Company successfully synthesized the M41S series ordered mesoporous silica material in 1992, due to its unique nano-scale ordered pores, high specific surface area and easy-to-modify surface properties, it was born in the field of nanomaterials and molecular sieves. Due to its strong adsorption capacity and large adsorption capacity, MCM-41 has high application value in the field of adsorption treatment of heavy metal ions in wastewater (such as Hg, Ag, Cr, Pb, Ba and Zn, etc.), after self-assembling 3-mercaptopropyltrimethoxysilane on the surface of mesoporous material MCM-41, it has a good adsorption effect on heavy metal ions in water. Shi Jianlin, a researcher at the Shanghai Institute of Ceramics, Chinese Academy of Sciences, found that the mesopo...

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