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Preparation method of composite photocatalyst containing nitrogen-doped titanium dioxide and zinc titanate

A nano-titanium dioxide and photocatalyst technology, applied in the field of environmental pollution control, can solve problems such as large particle size of zinc titanate powder, uneven distribution of components, and large environmental pollution, and achieve good dispersion, short process flow, and equipment simple effect

Inactive Publication Date: 2011-08-03
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The particle size of the zinc titanate powder prepared by the solid phase method is large, and the distribution of components is uneven; the particle size of the zinc titanate powder prepared by the sol-gel method is small, but the cost is high, and the raw materials are mostly organic reagents, which pollute the environment. Large; the direct precipitation method has a wide particle distribution and poor dispersibility
At present, there are no related reports on the preparation of nitrogen-doped nano-titanium dioxide / zinc titanate by urea uniform co-precipitation method and its antibacterial photocatalytic purification performance. This new photocatalyst has important application prospects in environmental governance

Method used

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  • Preparation method of composite photocatalyst containing nitrogen-doped titanium dioxide and zinc titanate

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Experimental program
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Effect test

Embodiment 1

[0039]In the soluble salt of titanium, urea is used as precipitant and doped nitrogen source, and zinc salt is used as composite zinc source, and nitrogen and composite zinc oxide are doped in the preparation of titanium dioxide by uniform precipitation method. To 0.1-0.5mol L -1 In the titanium sulfate solution, according to the ratio of the amount of substances, it is titanium sulfate: urea: zinc sulfate = 1: 10: 0.5 to prepare 150 mL of mixed solution, place it in a three-necked flask with a reflux cooling device, stir evenly, and add 20 mg Sodium dodecylbenzenesulfonate, a surfactant, is heated in a water bath to 60°C, urea decomposes to form a titanium dioxide precursor, and the temperature is kept constant for 0.5h. Then heat up to 90-100°C to completely decompose urea, slowly increase the pH of the solution, carry out nitrogen doping and semiconductor recombination, continue to stir and keep warm for 3-6h, and then use 0.5mol L -1 Ammonia slowly adjust the pH of the so...

Embodiment 2

[0046] In order to test the influence of different types of zinc sources on the properties of composite powders, except for the different types of zinc sources, the fixed reaction temperature is 95°C, the pH value of the solution is 7, the calcination temperature is 650°C, and other reaction conditions are the same as those in the examples. 1 with the same conditions. Figure 5 , 6 Indicates the comparison of the performance of samples prepared by adding different types of zinc sources in the process of precursor formation of titanium dioxide in the catalytic degradation of 10 mg / L methyl orange solution under 15 watt fluorescent lamp and 8 watt ultraviolet light respectively. Nitrogen-doped titanium dioxide / zinc titanate semiconductor compound Body (1), (2), (3), and (4) respectively represent that the composite zinc source is analytically pure zinc oxide, zinc nitrate, zinc chloride, and zinc sulfate. The results show that the photocatalytic rate of semiconductor composite ...

Embodiment 3

[0048] In order to test the influence of the concentration of the mixed solution on the performance of the semiconductor complex, the concentration of titanium sulfate, urea, and zinc salt solution was changed, the reaction temperature of the fixed reaction water bath was 95°C, the pH of the solution was adjusted to 7, the calcination temperature was fixed at 650°C, and other experimental conditions According to embodiment 1 method. The results show that when the concentration of titanium sulfate is 0.1-1.0mol L -1 , the concentration of urea is 0.28-3.0mol L -1 , the concentration of zinc salt solution is 0.01-0.5mol L -1 , the anatase titanium dioxide and zinc titanate semiconductor composite powder with small particle size and uniform shape was obtained, and had good antibacterial and photocatalytic degradation activities. The best experimental conditions are titanium sulfate concentration 0.1-0.5mol L -1 , the concentration of urea is 0.28-1.4mol L -1 , the concentrati...

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Abstract

The invention relates to a preparation method of semiconductor composite antibacterial photocatalyst containing nitrogen-doped titanium dioxide and zinc titanate, and belongs to the technical field of the treatment of environmental pollution. The semiconductor composite antibacterial photocatalyst is prepared a uniform coprecipitation method which comprises the following steps of: preparing a mixed solution in the amount-of-substance ratio of titanium sulfate to urea to zinc ions of 1:10:0; continuously mixing the mixed solution; raising the temperature of a water bath to 60 DEG C; adding a surfactant (sodium dodecyl benzene sulfonate) into the mixed solution based on the concentration of 20mg / 150ml; keeping a constant temperature for 0.5h; raising the temperature to 90-100 DEG C again; keeping the temperature for 3-6h; adding ammonia water into the solution to regulate to pH (potential of hydrogen) to be 6-8; washing and drying the obtained product; and forging the product at the temperature of 400-800 DEG C. The preparation method has the advantages of short process flow, simple equipment, simple and convenient operation, and low price of raw materials. The prepared semiconductor composite has the advantages of having good dispersibility, visible spectral response and low energy consumption, and is an environment-friendly antibacterial purification material.

Description

technical field [0001] The invention relates to a preparation method of an environment-friendly semiconductor composite antibacterial photocatalyst, in particular to a preparation method of a nitrogen-doped nano-titanium dioxide and zinc titanate photocatalyst, and belongs to the technical field of environmental pollution control. Background technique [0002] Since Fujishima and Honda discovered the photocatalytic decomposition of water to produce hydrogen on the n-type semiconductor titanium dioxide single crystal electrode, the heterogeneous photocatalytic technology has attracted great attention of scientists. Nano titanium dioxide can deodorize and eliminate bacteria, decompose pollutants, no secondary pollution, fast degradation, low energy consumption, is a new technology developed rapidly in recent years. However, since pure titanium dioxide needs ultraviolet light excitation, the recombination rate of photogenerated electrons and holes is high, resulting in low util...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06A01P1/00C02F1/30A01N59/16C02F1/32
CPCY02W10/37
Inventor 徐瑛何小松陈雪梅
Owner WUHAN UNIV OF TECH
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