Method for preparing functional modified hollow mesoporous or core/shell mesoporous silicon dioxide nanometer granules

Abstract

The invention relates to a method for preparing functional modified hollow mesoporous or core / shell mesoporous SiO2 nanometer granules. The method comprises the following steps of: (1) synthesizing, namely mixing a silane coupling agent with long-chain functional groups and a silicon source uniformly, adding the mixture into an alkaline solution containing monodisperse SiO2 nanometer particles, and performing centrifugal separation on a reaction product to prepare solid core / shell mesoporous SiO2 nanometer spheres; and (2), dispersing the solid core / shell mesoporous SiO2 nanometer spheres prepared in the synthetic process in the alkaline solution, and performing hydro-thermal reaction to obtain the functional modified hollow mesoporous or core / shell mesoporous SiO2 nanometer granules. According to the method, the synthesis and functional modification of the hollow or core / shell mesoporous SiO2 nanometer granules can be implemented synchronously by the process. By the process for synthesizing the functional hollow or core / shell mesoporous SiO2 spheres 'synchronously', the blockage of pore channels in shells by a post modification method is avoided, and the process is simple and easy, pollution-free, high in yield, low in cost and high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and relates to a hollow or core / shell structure mesoporous SiO with controllable particle size, monodispersity, large aperture and uniform size. 2 The preparation of spheres and the simultaneous realization of functional modification of different functional groups. Background technique [0002] Since 1992 MCM-41 mesoporous SiO 2 Since molecular sieves were synthesized by Mobil scientists, mesoporous SiO2 materials have shown broad application prospects in chemical catalysis, medicine, nanobiotechnology and other fields due to their high specific surface area, large pore volume, and uniform pore structure. Especially hollow mesoporous SiO 2 Nanoparticles, one of the most practical carriers, can be widely used in the fields of catalysis, adsorption, separation and targeted delivery of drugs. However, relevant modifications must be carried out for these applications, and the current modific...

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Problems solved by technology

[0003] The catalytic research of gold nanoparticles has been studied for many years. In order to make them have good toxicity resistance and recyclability, many researches using gold nanoparticles as catalysts are based on the traditional gold nanoparticles as the core and then coated with a layer. Shell, its disadvantage is that in the heterogeneous structure formed, gold nanoparticles are usually pre-synthesized, and the particle size of gold nanoparticles is not easy to control; and this method is cumbersome and uses a strong reducing agent

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