Composite metal ion doped with TiO2 photocatalyst transparent emulsion and preparation method thereof

Abstract

The invention relates to a transparent photocatalyst emulsion of composite metal ion doped with nano TiO2, which is characterized in that the emulsion comprises the following components by weight proportion: nano TiO2, 2.1 to 20 percent of metal salt containing lanthanum, cerium and vanadium, 1 to 10 percent of tween, arlacel, D-sorbitol or OP emulsifier and the residual amount of water. The mole ratio of the metal salt containing lanthanum, cerium and vanadium and titanium is 3.0 to 10 percent. The invention adopts inorganic salts with low price of titanium tetrachloride, lanthanum nitrate, cerous sulfate and metavanadic acid, and the like, adopts low-temperature complexation-control hydrolysis reaction to prepare the transparent photocatalyst emulsion of composite metal ion doped with nano TiO2, leads the materials to form more doping levels, thus widening the response interval of spectrum; the invention has the biggest advantages that sunlight or a fluorescent light is utilized directly to realize complete degradation to the organic pollutants of formaldehyde, benzene, dye, pesticide, microorganism and the like, and the speed and efficiency of degradation of organic matter by photocatalysis is improved, thus realizing the purification to environment.

Description

technical field [0001] The invention relates to a compound metal ion doped nano TiO 2 The transparent photocatalyst emulsion and its preparation method belong to the technical field of chemical synthesis and refining. Background technique [0002] In recent years, a large number of synthetic materials and automobile manufacturing materials used in home decoration have caused great pollution to the living environment. Photocatalytic oxidation treatment technology, as a new type of pollution control method, can finally degrade pollutants into non-toxic and harmless Inorganic small molecules can thoroughly purify the environment. Nano-scale titanium dioxide photocatalyst, which is widely studied at present, is the most potential photocatalytic oxidation material in the world today, and can be applied to deal with various environmental problems. However, nano-titanium dioxide powder is prone to agglomeration during storage, and it is difficult to recycle during photocatalysis....

AI Technical Summary

Problems solved by technology

However, the development of nano-titanium dioxide photocatalyst emulsion at home and abroad is mostly an emulsion made of nano-titanium dioxide powder through special processing. Due to the serious agglomeration of nano-powder, it is very difficult to redisperse and consumes high energy. Therefore, the emulsion prepared by this process Poor dispersion and poor stability

There are also emulsions directly synthesized by chemical methods, which have better dispersibility and stability, but titanium dioxide is a wide bandgap material (3.2eV), which can only absorb the ultraviolet part of the solar spectrum, and usually needs to be excited by an ultraviolet light source. Low (less than 5% of ultraviolet light in the solar spectrum), which limits its practical application

In order to improve the utilization rate of titanium dioxide to sunlight, many beneficial attempts have been made, the most notable of which is the use of photosensitizing dyes for sensitization, such as Ross et al. reported that sensitizing titanium dioxide with organic dyes can improve the utilization rate of the solar spectrum , but there is an adsorption competition between the sensitizer and the pollutant, and the photostability of the sensitized titanium dioxide is not ideal

Falconer et al. used Pt noble metal doping on TiO 2 modified, but the expensive price of noble metals is well known; Chol et al. used Fe, Co, Zn and more than ten kinds of metal ions to treat nano-TiO 2 Doping research has been carried out, but due to the doping of individual metal ions, there is no major breakthrough in the improvement of material properties. In the actual application process, there are still very few doping energy, and the transfer speed of photoinduced electron and hole pairs is slow. , the problem of high recombination rate leads to low photocatalytic quantum efficiency, low photocatalytic activity, and difficulty in fully utilizing solar energy.

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