Method for preparing mesoporous silica material by hydroxyethyl cellulose serving as template

Abstract

The invention relates to a method for preparing a mesoporous silica material by hydroxyethyl cellulose serving as a template. The method particularly includes the steps: 1) adding hydroxyethyl cellulose into water, heating, stirring and dissolving to obtain hydroxyethyl cellulose water solution, slowly adding alkali metal silicate water solution into the hydroxyethyl cellulose water solution to uniformly mixing mixture, sufficiently stirring the mixture until clear and bright solution is acquired, adjusting a pH (potential of hydrogen) of a reaction system to reach 5-6 by acid solution, and standing for 1-24 hours to obtain reaction liquid; 2) centrifuging the reaction liquid, drying and collecting to obtain a solid matter, and calcining the solid matter to obtain the mesoporous silica material. According to the method, a non-ionic surface active agent serves as a hydroxyethyl cellulose template agent to assemble mesoporous silica, unformed mesoporous silica material is synthesized byan unconventional acid hydrolysis process, and the raw materials are rich, renewable and good in biocompatibility, and the method is simple in synthetic process, mild and controllable in preparation condition and simple, efficient and nontoxic in preparation process.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a method for synthesizing a mesoporous silica material through a sol-gel method by using inorganic silicate and cellulose nonionic surfactant. Background technique [0002] Mesoporous silicon material has a narrow pore size distribution range, adjustable size, stable skeleton, and regular and orderly structure. It is a good adsorbent carrier, especially its surface is easy to functionalize, and can be used to prepare mesoporous adsorbents with different surface properties. The introduction of specific functional objects makes mesoporous silicon materials a new material with different functionalities to meet the needs of different use environments. In addition, these materials are easy to separate from the mother liquor after adsorption. Through pickling, roasting or extraction and other processes, pollutants can be recycled and adsorbents can be regenerate...

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Problems solved by technology

[0003] In CN1348920A, use inorganic silicon material as silicon source, colloidal particle and block copolymer as template, prepared mesoporous silica material in alcoholic solvent, but this reaction sol-gel process speed is slow, and solvent evaporates in large quantities Finally, the shrinkage rate of the material is very large, resulting in many cracks in the material, and the operation steps are cumbersome

[0004] In CN1605562A, the oil-soluble silicon source is used, and the emulsion formed by mixing an aqueous electrolyte solution, a nonionic surfactant and anionic surfactant as a template has prepared a mesoporous silica material, but the reaction is introduced while the electrolyte , also introduces a large number of impurities, which increases the difficulty of the post-processing process

Although the preparation conditions of this invention are relatively mild, the concentration of raw material silicate in the system is too low (mass concentration is not more than 10%), which will inevitably lead to excessive equipment volume during large-scale production, increasing production costs, energy consumption and pollutant emissions Wait

[0006] At present, the main silicon source for synthesizing mesoporous silicon materials is silicate, most of which is orthoethyl silicate (TEOS). The synthesis cost of this kind of silicon source is relatively high, which limits the industrial application of mesoporous silica materials.

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