A kind of method for preparing nano-titanium dioxide by steaming at low temperature

Abstract

The present invention relates to a method for preparing nanometer titanium dioxide through a low temperature water steaming treatment. The method comprises: mixing a titanium source and a chelating agent, and completely and uniformly stirring to obtain a homogeneous yellow solution; completely and uniformly mixing deionized water and a catalyst, and adjusting the pH value of the solution to 2-3; under the state of a water bath and vigorous stirring, slowly adding the yellow solution to the deionized water and catalyst mixed solution in a dropwise manner, continuously and vigorously stirring for 2-6 h after completing the addition, and aging for 24-72 h to obtain the transparent Ti02 hydrosol with blue light; and placing the TiO2 hydrosol on different substrate materials, and placing into a water steaming environment to steam for 6-10 h to obtain nanometer TiO2 with different forms. According to the present invention, the conventional high temperature powder preparation method is broken through; and high catalysis activity nanometer TiO2 with a good dispersion performance can be obtained without addition of any dispersing agents, industrial production is easily achieved, and an application of the nanometer TiO2 in materials with a characteristic of no high temperature resistance is broadened.

Description

technical field [0001] The invention relates to the field of nanometer material science, in particular to a method for preparing nano titanium dioxide by low-temperature steaming treatment, which is used on substrates that are not resistant to high temperatures (such as textiles and plastics). Background technique [0002] Due to its non-toxicity, stable performance, high photocatalytic activity, strong chemical corrosion resistance, non-selective degradation of organic matter in water pollutants, and no secondary pollution, nano-titanium dioxide has become a popular and widely used material nowadays. Foreground photocatalyst. It is widely used in environmental protection fields such as gas purification, treatment of organic pollutants, antibacterial deodorization, anti-fog and self-cleaning coatings. [0003] The preparation methods of nano-titanium dioxide can be classified into three categories: solid-phase method, gas-phase method and liquid-phase method. Each preparat...

AI Technical Summary

Problems solved by technology

It can be seen that the above methods mainly use inorganic titanium sources as raw materials, and there are problems such as complicated preparation process, long time consumption, and unfavorable mass production; and TiCl 4 During the hydrolysis process, a large amount of highly corrosive gas hydrogen chloride will be produced, which is not environmentally friendly and will cause damage to human health

In the Chinese patent with the application number 200510039171.6, the organic titanium source is fully mixed with the organic alcohol solvent to obtain a titanium compound alcohol solution, which is then added dropwise into an acidic aqueous solution for hydrolysis, and after reflux at 65-85°C for 6-48 hours, the Evaporate and remove alcohols at 50-55°C to obtain anatase TiO 2 Sol, this process needs to be refluxed at a higher temperature, which is not conducive to mass production, and the organic solvent needs to be removed by evaporation, which has certain pollution to the environment

[0006] In summary, the currently reported low-temperature nano-TiO 2 Although there are many kinds of preparation methods, there are deficiencies in varying degrees from the perspective of industrial production and environmental issues.

Images