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Nickel oxide doped sodium titanate-titanium dioxide composite photocatalyst and preparation method thereof

A technology of titanium dioxide and sodium titanate, which is applied in the field of composite photocatalyst preparation, can solve the problems of reducing TiO2 photocatalytic activity, adsorption and utilization, and catalyst specific surface area reduction, so as to increase catalytic active sites and uniform size , the effect of improving photocatalytic efficiency

Inactive Publication Date: 2014-12-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Negishi et al used isopropyl titanate as raw material in Sol-Gel Sci.Technol., 2001, 22, 23-31, and loaded TiO on glass by sol-gel method 2 thin film, however, TiO 2 After the photocatalyst was immobilized, the TiO 2 Compared with the powder, the photocatalytic efficiency has decreased to varying degrees, which is because the specific surface area of ​​the catalyst is reduced after being fixed, which reduces the adsorption and utilization rate, and reduces the TiO 2 photocatalytic activity

Method used

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  • Nickel oxide doped sodium titanate-titanium dioxide composite photocatalyst and preparation method thereof
  • Nickel oxide doped sodium titanate-titanium dioxide composite photocatalyst and preparation method thereof
  • Nickel oxide doped sodium titanate-titanium dioxide composite photocatalyst and preparation method thereof

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Embodiment 1

[0026] A. Cut the nickel foam into different sizes and shapes as required, ultrasonically wash with absolute ethanol and deionized water to remove surface impurities, and dry. In the air, the temperature was raised to 550°C at a rate of 5°C / min for 10 minutes of pre-oxidation treatment.

[0027] B. Add 20mL of ethanol, 10mL of acetic acid, and 2mL of tetrabutyl titanate into the reaction kettle, stir evenly, put in the nickel foam treated in step A, and seal it. The reaction kettle was heated at 120°C for 10h, cooled down naturally, and then dried. Then, it was calcined at 550° C. for 45 minutes at a heating rate of 2° C. / min in an air atmosphere to obtain a foamed nickel-supported titania nano-film.

[0028] C. Prepare a 10 mol / L sodium hydroxide solution, put the foamed nickel-supported titanium dioxide nano-film sample obtained in step B, and heat at 100° C. for 9 hours. After the reactor was cooled down naturally, it was taken out, washed with deionized water, and dried...

Embodiment 2

[0030] A. Cut the nickel foam into different sizes and shapes as required, ultrasonically wash with absolute ethanol and deionized water to remove surface impurities, and dry. In the air, the temperature was raised to 550°C at a rate of 5°C / min for 10 minutes of pre-oxidation treatment.

[0031] B. Add 20mL of ethanol, 10mL of acetic acid, and 2mL of tetrabutyl titanate into the reaction kettle, stir evenly, put in the nickel foam treated in step A, and seal it. The reaction kettle was heated at 120°C for 10h, cooled down naturally, and then dried. Then, it was calcined at 550° C. for 45 minutes at a heating rate of 2° C. / min in an air atmosphere to obtain a foamed nickel-supported titania nano-film.

[0032] C. Prepare a 10 mol / L sodium hydroxide solution, put the foamed nickel-supported titanium dioxide nano-film sample obtained in step B, and heat at 160° C. for 9 hours. After the reactor was cooled down naturally, it was taken out, washed with deionized water, and dried...

Embodiment 3

[0034] A. Cut the nickel foam into different sizes and shapes as required, ultrasonically wash with absolute ethanol and deionized water to remove surface impurities, and dry. Pre-oxidation treatment was performed in air at a heating rate of 5°C / min to 400°C for 10 minutes of calcination.

[0035] B. Add 16 mL of propanol, 8 mL of acetic acid, and 2 mL of tetrabutyl titanate into the reaction kettle, stir evenly, put in the nickel foam treated in step A, and seal it. The reaction kettle was heated at 100°C for 15h, cooled down naturally, and then dried. Then, it was calcined at 400° C. for 30 minutes at a heating rate of 2° C. / min in an air atmosphere to obtain a foamed nickel-supported titania nano-film.

[0036] C. Prepare a 5 mol / L sodium hydroxide solution, put the foamed nickel-supported titanium dioxide nano-film sample obtained in step B, and heat at 100° C. for 8 hours. After the reactor was cooled down naturally, it was taken out, washed with deionized water, and dri...

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Abstract

The invention provides a nickel oxide doped sodium titanate-titanium dioxide composite photocatalyst and a preparation method thereof. The method comprises the following steps of: growing in situ a supported titanium dioxide nano film on a foamed nickel substrate by taking titanium salt as a precursor; drying and calcining, and immersing in a sodium hydroxide solution; and performing a hydrothermal reaction to grow a sodium titanate-titanium dioxide-nickel oxide composite film on the surface, wherein in the film, sodium titanate-titanium dioxide exists in the form of nanosheet or nanotube array, and nickel oxide nano particles are uniformly dispersed on the surface of the film. Since the sodium titanium is a lamellar structure with charges on the laminate and the p-type semiconductor nickel oxide is uniformly doped, the photocatalysis efficiency of the composite material is obviously improved. Meanwhile, the nano array type photocatalyst based on a foamed nickel substrate increases the specific surface area of the catalyst, reduces the mass transfer resistance, overcomes the shortcomings of easy agglomeration, easy loss and difficult recover of a powder photocatalyst, and facilitates the regeneration and utilization of the catalyst.

Description

technical field [0001] The invention relates to a composite photocatalyst preparation technology, in particular to a nickel oxide doped sodium titanate-titanium dioxide composite photocatalyst and a preparation method thereof. technical background [0002] Photocatalytic technology is an environmentally friendly technology with broad application prospects in the field of environmental purification. The most widely studied photocatalyst is nano-TiO 2 , because of its simple preparation process, low cost, high activity, good chemical and thermal stability, safety and non-toxicity, etc., it is a green catalyst with great development prospects. At the same time, the layered sodium titanate material has a crystal structure and properties similar to titanium dioxide, and it also has a special layered structure, and the laminates have negative charges. It is an important solid functional material. , separation and conduction and many other fields have broad application prospects....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78
Inventor 常铮宋小娜孙晓明刘军枫雷晓东任剑
Owner BEIJING UNIV OF CHEM TECH
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