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

A technology of composite metal ions and photocatalysts, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as poor stability, high energy consumption, and poor dispersion of emulsions, and achieve broad spectrum Response range, improved speed and efficiency, uniform dispersion effect

Inactive Publication Date: 2009-03-11
HEBEI UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) At room temperature, measure 33 mL of titanium tetrachloride with a graduated cylinder, and slowly drop it into 100 mL of distilled water to obtain a clear and transparent solution;

[0028] (2) lanthanum nitrate of 4.33 grams and 4.08 grams of cerium sulfate and 1.16 grams of ammonium metavanadate are dissolved in the above-mentioned solution, stir until all dissolving;

[0029] (3) Add pure water to the above solution until the solution is 1000ml, then add 10% ammonia water to the solution, adjust the pH value to 9, and produce a large amount of light yellow precipitate;

[0030] (4) Vacuum filter the above precipitate and wash it with deionized water until it is tested to be free of Cl with silver nitrate solution. - So far, a TiO doped with a molar ratio of metal ions to titanium of 10% has been obtained 2 filter cake;

[0031] (5) Add 2100 ml of water to the above filter cake to make a slurry, cut it with a high-speed shear for 50 minutes, place it in a round...

Embodiment 2

[0034] (1) 4.33 gram of lanthanum nitrate and 4.08 gram of cerium sulfate and 1.16 gram of ammonium metavanadate are dissolved in 250ml water, stir until all dissolve;

[0035] (2) At room temperature, take 110ml of titanium tetrachloride with a graduated cylinder, slowly drop it into the above solution with a separatory funnel to obtain a clear and transparent solution, add pure water until the solution is 1000ml;

[0036] (3) Add 10% ammonia water to the above solution, adjust the pH value to 9, produce a large amount of pale yellow precipitate, vacuum filter the precipitate, wash it with deionized water until it is tested to be free of Cl with silver nitrate solution - So far, TiO with a total molar ratio of doped metal ions to titanium of 3% has been obtained 2 filter cake;

[0037](4) Add 1350 milliliters of water to the above-mentioned filter cake to make a slurry, and after shearing with a high-speed shear for 50 minutes, place it in a round-bottomed flask, add 90ml of...

Embodiment 3

[0040] (1) lanthanum nitrate of 8.66 grams and 8.16 grams of cerium sulfate and 2.32 grams of ammonium metavanadate are dissolved in 500ml water, stir until all dissolve;

[0041] (2) At room temperature, take 110ml of titanium tetrachloride with a graduated cylinder, slowly drop it into the above solution with a separatory funnel, to obtain a clear and transparent solution, add pure water until the solution is 1000ml;

[0042] (3) Add 10% ammonia water to the above solution, adjust the pH value to 8.5, produce a large amount of pale yellow precipitate, vacuum filter the precipitate, wash it with deionized water until it is checked that it does not contain Cl with silver nitrate solution - So far, TiO with a total molar ratio of doped metal ions to titanium of 6% has been obtained 2 filter cake;

[0043] (4) Add 675 milliliters of water to the above-mentioned filter cake to make a slurry, and after cutting for 50 minutes with a high-speed shear, place it in a round-bottomed f...

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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....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/12
Inventor 丁士文丁宇
Owner HEBEI UNIVERSITY
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