Elliptic mesoporous silicon dioxide molecular sieve and preparation method thereof

Abstract

The invention discloses a mesoporous silicon dioxide molecular sieve with elliptic appearance and a preparation method thereof. An industrialized nonionic surfactant is used as a template agent, an organic silicon source is used as a precursor, and the mesoporous silicon dioxide molecular sieve is prepared through synergy of the surfactant and inorganic substances in an acid medium and a hydrothermal treatment process in the presence of multiple additives such as inorganic salt, organic alcohol and the like. The obtained mesoporous silicon dioxide molecular sieve has elliptic regular appearance. The axial ratio of a long axis to a short axis of an ellipsoid is adjustable between 1.0 and 5.0, the aperture of the elliptic mesoporous silicon dioxide molecular sieve is between 6 and 12 nanometers, the pore volume is between 0.8 and 2.0 cm<3> / g, and the specific surface area is between 400 and 1,000 cm<2> / g. The method has the advantages of easily obtained raw materials, simpler process requirements and feasible operation, and is suitable for industrialized large-scale production.

Description

technical field [0001] The invention relates to an ellipsoid mesoporous silicon dioxide molecular sieve and a preparation method thereof. More specifically, it relates to a polymer block copolymer nonionic surfactant as a template, in an acidic medium, through the auxiliary action of inorganic salts and organic alcohols, under hydrothermal conditions to synthesize elliptical, large-pore A method for mesoporous silica molecular sieves with high specific surface area and high pore volume. [0002] Background technique [0003] The morphology of nanostructures has a very important influence on the chemical, physical and fluid properties of materials. In recent years, many methods have been developed for the controlled synthesis of nanostructured materials with different morphologies. At present, people have been able to directly prepare relatively simple shapes such as spheres, polyhedrons, nanorods and nanowires through chemical and physical methods. However, more direct me...

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Problems solved by technology

Although ion sputtering and chemical vapor phase methods can also obtain elliptical anisotropic materials, the uniformity of the obtained particles is poor and expensive equipment is required

In addition, the above-mentioned methods are difficult to mass-produce nanostructured materials with elliptical appearance.

Thus limiting the further application of these anisotropic particles in the field of metamaterials

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