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Silver chloride-titanium dioxide nanotube composite material and preparation method and application thereof

A technology of titanium dioxide and composite materials, applied in chemical instruments and methods, special compound water treatment, physical/chemical process catalysts, etc., can solve cumbersome, complicated methods, time-consuming and labor-intensive problems

Inactive Publication Date: 2016-07-27
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing preparation of AgAgCl / TNTs ternary photocatalyst is used for the degradation of methylene blue (Wen Yanyuan, Ding Yuming. AgAgCl modified anatase phase TiO 2 Preparation of nanotubes and their photocatalytic properties. Acta Catalytica Sinica, 2011,32(1):36-45.), this method is relatively complex and cumbersome, time-consuming and labor-intensive
There is no report on the preparation of silver chloride-titania nanotube catalyst and its application in the photocatalytic reduction of nitrate to nitrogen

Method used

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  • Silver chloride-titanium dioxide nanotube composite material and preparation method and application thereof
  • Silver chloride-titanium dioxide nanotube composite material and preparation method and application thereof
  • Silver chloride-titanium dioxide nanotube composite material and preparation method and application thereof

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preparation example Construction

[0024] The present invention also provides a preparation method of silver chloride-titanium dioxide nanotube composite material, comprising:

[0025] Step 1: Mix and stir titanium dioxide P25 and NaOH solution, the stirring time is preferably 30-60min to obtain a mixed solution; the mass (g) of titanium dioxide P25: NaOH solution (ml) is preferably (0.6-1.0): (30-50); the concentration of NaOH solution is preferably 10mol L -1 ;

[0026] Step 2: Put the mixed solution obtained in Step 1 into a reactor, which is preferably a polytetrafluoroethylene-lined reactor, and then raise the temperature from room temperature to 130-150°C at a rate of 2°C / min. And keep it for 24 hours to obtain the mixture; the mixture is acid-washed, preferably: the cooled mixture is taken out, washed repeatedly with distilled water until the pH value is 6.8-7.2, and then washed with 0.1mol·L -1 Wash with HCl solution until the pH value is 1.0, ultrasonication for 30-60min, and standing for 3-5h;

[0...

Embodiment 1

[0033] Mix 0.6gP25 with 30ml of 10mol·L -1 The NaOH solution was mixed and stirred for 60 minutes, then the mixed solution was transferred into a polytetrafluoroethylene-lined reaction kettle, placed in a temperature-programmed oven, and the temperature was raised from room temperature to 150°C at a rate of 2°C / min, and kept for 24h. The final mixture was taken out, washed repeatedly with distilled water until the pH value was about 7.0, and then washed with 0.1mol·L -1 The HCl solution was washed until the pH value was about 1.0, after ultrasonication for 30min, and after standing for 3h, 0.007g, 0.0373g and 0.079g of AgNO were added to the mixture 3 , the mixture was washed again with pure water until the pH value was about 7.0, and then dried in an oven at 80°C for 12h, and the dried solid was placed in a muffle furnace and calcined at 400°C for 2h to obtain an AgCl content of 1%. , 5% and 10% silver chloride-titanium dioxide nanotube composites.

Embodiment 2

[0035] Mix 0.8g P25 with 40ml of 10mol·L -1 The NaOH solution was mixed and stirred for 45 minutes, then the mixed solution was transferred into a polytetrafluoroethylene-lined reactor, placed in a temperature-programmed oven, and the temperature was raised from room temperature to 140°C at a rate of 2°C / min, and kept for 48h. The final mixture was taken out, washed repeatedly with distilled water until the pH value was about 6.8, and then washed with 0.1mol·L -1 HCl solution was washed until the pH value was about 1.0, after ultrasonication for 30min, and after standing for 3h, 0.01g of AgNO was added to the mixture 3, the mixture was washed again with pure water until the pH value was about 7.0, and then dried in an oven at 100°C for 12h, and the dried solid was placed in a muffle furnace and calcined at 400°C for 2h to obtain silver chloride-titanium dioxide nanotube composites. The physical and chemical properties of the AgCl / TNTs surface obtained in Example 2 are: avera...

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Abstract

The invention provides a silver chloride-titanium dioxide nanotube composite material and a preparation method and application thereof, and belongs to the field of composite materials. A chemical formula of the silver chloride-titanium dioxide nanotube composite material is AgCl / TNTs. The invention further provides a preparation method of the silver chloride-titanium dioxide nanotube composite material. The method comprises the steps of firstly mixing and stirring titanium dioxide P25 with NaOH solution to obtain mixed solution; then putting the mixed solution into a reaction kettle, increasing temperature from room temperature to 130 to 150 DEG C according to speed of 2 DEG C / min, and maintaining the temperature for 24h to obtain mixture; finally adding AgNO3 into the mixture for drying, and calcining the solid obtained after drying for 2h at 400 DEG C to obtain the silver chloride-titanium dioxide nanotube composite material. The invention further provides application of the silver chloride-titanium dioxide nanotube composite material as photocatalyst. The photocatalyst can reduce nitrate into nitrogen gas, the conversion rate of nitrate is 94.5 percent and the selectivity of nitrogen gas is 92.9 percent.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a silver chloride-titanium dioxide nanotube composite material and a preparation method and application thereof. Background technique [0002] With the vigorous development of agriculture, a large amount of nitrogen enters the water body and causes nitrate pollution. How to reduce and prevent the nitrate pollution of water body has become an urgent problem. Traditional treatment methods have the problems of long treatment time and easy to produce secondary pollution, so research on an efficient and thorough nitrate removal method has become a topic of common concern at home and abroad. In recent years, photocatalytic technology has developed rapidly, especially in the treatment of organic pollutants in water. It is expected to be applied to the actual sewage treatment in the near future. Similarly, the application of photocatalytic technology to the removal of nitr...

Claims

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Application Information

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IPC IPC(8): B01J27/135C02F1/30C02F1/70
CPCC02F1/30C02F1/70B01J21/063B01J27/135C02F2305/10C02F2101/163B01J35/39
Inventor 杨霞陈志挺于洪斌张磊耿直朱遂一杨敏杨雪马国强王昭华王晓燕
Owner NORTHEAST NORMAL UNIVERSITY
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