Preparation method of nano silicon oxide with small particle size and super high specific surface area

Abstract

The invention discloses a preparation method of small-particle-size and ultrahigh-specific-surface-area nano silicon oxide, wherein the preparation method includes following steps: (1) filling a reaction container with metered inorganic acid, sodium silicate, a nucleating agent, a dispersing agent and pure water, and performing high-speed shear emulsification stirring to perform a first reaction; (2) filling the reaction container with metered first reaction product, inorganic acid and a nucleating agent, and performing a secondary reaction with low-speed stirring; (3) regulating the pH of a secondary reaction product to be less than 3 with addition of alkali, and performing an aging reaction under the condition for stably shaping particles; and (4) deacidifying and desalting washing the reaction product under a strong acidic condition to obtain the small-particle-size and ultrahigh-specific-surface-area nano silicon oxide. According to the method, a nano silicon oxide preparation process through a method of precipitation is improved, wherein a graded multiple reaction process under different conditions and a special washing process are designed, by that the particle size and the specific surface area of the nano silicon oxide are controllable, so that the preparation method can be used for preparing the small-particle-size and ultrahigh-specific-surface-area nano silicon oxide.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and more specifically relates to a method for preparing nano silicon oxide. Background technique [0002] Nanomaterials refer to solid materials composed of extremely fine grains with characteristic dimensions on the order of nanometers (1-100nm). effect, quantum size effect, and macroscopic quantum tunneling effect. At the same time, it has special properties that traditional materials and devices do not have in the fields of electricity, magnetism, optics, adsorption, catalysis, and biology, so it has extremely wide applications. [0003] Nano silicon oxide (also known as nano silicon dioxide) is a typical nano material because of its small particle size, large specific surface area, strong surface adsorption force, large surface energy, high chemical purity, good dispersion performance, thermal resistance, Resistance and other aspects have specific properties. With its superi...

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Problems solved by technology

However, this method still has the defects that the particle size and specific surface area are uncontrollable, and its microstructure, dispersion and porosity cannot be effectively guaranteed, so that the prepared nano-silica still has large particle size and low specific surface area. problems, unable to meet the needs of various industry applications at this stage

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