Method for preparing nano titanium dioxide by using surfactant peptization method

Abstract

The invention belongs to a field for preparing nano titanium dioxide, which discloses a method for preparing the nano titanium dioxide by using a surfactant colloidal chemical method with simple process and low cost. The method adopts meta-titanic acid as raw material; acetate, oxalate, citric acid, tween 20, span 40, polyethylene glycol 2,000 and polyvinyl alcohol 2,000 are added to be carried out peptization reaction under water bath temperature of 30-90 DEG C to obtain nano meta-titanic acid colloidal solution; then precursor of titanium dioxide nano-particle is prepared by drying; the precursor is calcinated and heat preserved to obtain nano titanium dioxide powder. The method for preparing the nano titanium dioxide has wide material source, low cost and simple preparation process; furthermore, the method does not need to update and transform the device and has no special production devices and low cost; the method has low cost of the titanium material and little environment pollution; the nano titanium dioxide is prepared by three steps.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanoparticle materials, in particular to the use of low-cost titanium raw material - metatitanic acid (H 2 TiO 3 、TiO(OH) 2 ) adding a combined organic surfactant without inorganic impurity anions or cations—peptizer peptization method to prepare nano-titanium dioxide. Background technique [0002] The reason why nanomaterials have been widely concerned by various countries in the world in recent decades, especially in recent years, the upsurge in the preparation and application of nanomaterials has been higher than one wave. The fundamental reason is that people have found in research that nano Materials have basic characteristics such as small size effect, surface interface effect, quantum size effect and quantum tunneling effect. These characteristics make nanomaterials have unique properties and great potential application value that cannot be compared with tra...

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Problems solved by technology

[0007] The preparation of nanopowder by liquid phase method has the advantages of using ordinary equipment and mature and simple process flow, but there is a contradiction. If the primary particle size of the controlled precipitation is small, the specific surface area will be large, the adsorption capacity will be strong, and the particle agglomeration will be serious, which will block the filter cloth. It is difficult to operate the filtration and cleaning process; due to the strong adsorption capacity, impurity ions are not easily eluted; due to the strong adsorption capacity, the agglomeration is serious, so that the particles are easy to grow when the calcined powder is transformed from hydroxide to oxide, and it is difficult to obtain nanoparticles.

If the size of the primary particles used to control the precipitation is large, although it is easier to filter and clean, the primary particles are no longer nano-scale at this time, so no nanoparticles can be obtained after calcination.

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