Low-temperature two-step method for preparing composite anatase type titanium dioxide visible light catalyst

An anatase type, titanium dioxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst activation/preparation, etc., can solve the problem of reducing photocatalytic performance, loss of doping elements, Catalyst agglomeration and other problems, to achieve the effect of improving photocatalytic performance, reducing the degree of agglomeration, and uniform dispersion

Inactive Publication Date: 2012-06-20
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a low-temperature two-step method for preparing a composite anatase-type titanium dioxide visible light catalyst, to solve the problem of high energy consumption in the process of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Add 0.06mol tetrabutyl titanate to 1.80mol ethanol, stir and mix evenly, add 0.01mol zinc acetate, stir well, add 0.04mol concentrated nitric acid dropwise, stir for 5min, then slowly add 0.10mol deionized water , keep stirring vigorously during the dropping process, place the container in a water bath at 60°C and continue stirring, and react for 1.5 hours to prepare zinc-doped titanium dioxide colloid. After the above-prepared colloid is cooled to room temperature, move it into a high-pressure container, then add 0.04mol zinc carbonate, seal the container, keep it at 90°C for 18 hours, filter the precipitate, rinse it with deionized water, and dry it at 60°C. Zinc-doped anatase titanium dioxide powder was obtained. The X-ray diffraction pattern of the prepared powder was calculated by Scherrer equation (Scherrer equation), and the average crystal diameter was 8.8nm.

[0019] Visible light catalysis experiment: Take 0.2g of the prepared catalyst, add it into...

Embodiment 2

[0020] Example 2: Add 0.02 mol of isopropyl titanate to 1.40 mol of ethanol, stir and mix evenly, add 0.003 mol of silver nitrate, add 0.05 mol of lactic acid dropwise after stirring well, and slowly add 0.05 mol of deionized water dropwise after stirring for 5 minutes, Vigorous stirring was maintained during the dropping process, and the container was placed in a 50° C. water bath to continue stirring. After 2 hours of reaction, a silver-doped titanium dioxide colloid was obtained. After the above-prepared colloid is cooled to room temperature, move it into a high-pressure container, then add 0.008mol ammonium carbonate, seal the container, keep it at 98°C for 26 hours, filter the precipitate, rinse it with deionized water, and dry it at 75°C. The silver-doped anatase titanium dioxide powder was obtained, and the average crystal diameter was 10.8nm. Visible photocatalytic performance test is the same as that of Example 1, and the result shows that the degradation rate of meth...

Embodiment 3

[0021] Example 3: Add 0.09mol tetrabutyl titanate to 1.98mol isopropanol, stir and mix evenly, then add 0.005mol tantalum ethoxide, stir well and then add 0.08mol concentrated hydrochloric acid dropwise, after stirring for 5 minutes, slowly add 0.15mol dropwise to remove Ionized water, keep stirring vigorously during the dropping process, place the container in a water bath at 75°C and continue stirring, and react for 1.5 hours to prepare tantalum-doped titanium dioxide colloid. After the above-prepared colloid is cooled to room temperature, move it into a high-pressure container, then add 1.05mol hydrogen peroxide, seal the container, keep it at 92°C for 22 hours, filter the precipitate, rinse it with deionized water, and dry it at 65°C to obtain Tantalum doped anatase titanium dioxide powder, the average crystal diameter is 9.7nm. Visible photocatalytic performance test is the same as that of Example 1, and the result shows that the degradation rate of methyl orange is 93.6%...

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Abstract

The invention discloses a low-temperature two-step method for preparing a composite anatase type titanium dioxide visible light catalyst, and belongs to the visible light catalyst. The preparation method comprises the following steps of: 1, adding titanium-containing precursor into alcohol, uniformly mixing and then adding a dopant, fully stirring, then adding an inhibitor and de-ionized water respectively, and performing water bath heating to prepare colloid containing titanium and doping element; and 2, cooling the prepared colloid to room temperature, transferring into a high-pressure-resistant container, adding a thermal decomposition type compound into the colloid, then quickly sealing the container, heating to perform reaction, preserving heat, obtaining precipitate after the reaction is finished, filtering the precipitate and washing with the de-ionized water and then drying to prepare the composite anatase type titanium dioxide visible light catalyst. The method has the advantages that: 1, the catalyst is prepared under the condition of 80-100 DEG C, and the energy consumption is favorably reduced during preparation; and 2, subsequent high-temperature treatment is not required in the method, the defect of high probability of losing the doping element through the high-temperature treatment is avoided, and the photo-catalytic performance is favorably improved.

Description

technical field [0001] The invention relates to a visible light catalyst, in particular to a low temperature two-step method for preparing a composite anatase titanium dioxide visible light catalyst. Background technique [0002] Anatase titanium dioxide is an ideal photocatalytic material, but because its forbidden band width is only 3.2eV, it needs higher energy ultraviolet light to excite the electrons in its valence band, and this part of ultraviolet light only occupies the solar spectrum. About 4% of the solar spectrum, and the vast majority of visible light, which accounts for 45% of the solar spectrum, has not been effectively utilized. In addition, there are problems such as the recombination of electrons and holes, resulting in a very low photon quantum yield, which limits the practical application of titanium dioxide photocatalytic technology. Many studies in recent years have shown that the preparation of composite titanium dioxide by element doping can broaden t...

Claims

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Application Information

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IPC IPC(8): B01J37/08B01J23/06B01J23/50B01J23/20B01J27/24B01J23/14B01J27/135B01J23/72B01J27/138B01J27/20B01J27/02B01J23/28
Inventor 许程强颖怀钟耀东李玲玲韩慧陈众刘炯天
Owner CHINA UNIV OF MINING & TECH
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