Titanium dioxide powder with ultrahigh water dispersion and high photocatalytic activity and preparation method thereof

Abstract

The invention relates to titanium dioxide powder with ultrahigh water dispersion and high photocatalytic activity and a preparation method thereof. The method comprises the following steps: adding titanium salt in alcohol solvent to prepare precursor, performing low-temperature non-aqueous solvent heat treatment to the precursor, washing the product with ethanol, centrifuging, and drying to obtain titanium dioxide powder with ultrahigh water dispersion and high photocatalytic activity. The obtained titanium dioxide belongs to anatase polycrystal and consists of 5-10nm of particles; the isoelectric point of titanium dioxide is 6.3; when the pH value is less than 5 or more than 6.5, the absolute value of the Zeta potential is more than 30 millivolts; the weight percentage of titanium dioxide is 0.1%-50%, the aqueous dispersion can remain stable for at least 48 hours; and the pollutants can be completely degraded in 1 hour under the simulated sunlight. The method of the invention has simple synthetic route, controllable technological process, low reaction temperature, accessible raw materials, low cost and high yield which is up to 97% and is suitable for industrial mass production.

Description

technical field [0001] The invention relates to an anatase titanium dioxide powder with ultra-high dispersibility and high photocatalytic activity and a preparation method thereof, which is prepared by a non-aqueous sol-gel method, and the obtained anatase titanium dioxide powder not only has a high Photocatalytic activity, and can be stably dispersed in water at a mass concentration of 50%. Background technique [0002] Titanium dioxide is chemically stable, non-toxic, and inexpensive to produce, and is a widely used commercial product, used as an additive in pigments, paints, ointments, etc. Since 1972, two professors, Fujishima and Honda of the University of Tokyo, Japan, discovered that the rutile titanium dioxide single crystal electrode generates an electromotive force under the irradiation of a xenon lamp, and electrolyzes water to generate hydrogen, indicating that titanium dioxide can convert light energy into chemical energy stored in hydrogen [Fujishima A , Honda...

AI Technical Summary

Problems solved by technology

However, the method used by Du et al. is relatively complicated, and the amount of water added needs to be strictly controlled. If water is not added according to the ratio mentioned in the text, anatase titanium dioxide with high dispersion cannot be synthesized [Wang P., Wang D.J., Li H.Y , et al.A facile solution-phase synthesis of high quality water-soluble anatase TiO 2 nanocrystals J. Colloid Interface Sci. 2007, 314, 337-340]

Images