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Lignin carbon/nano titanium dioxide composite photocatalyst as well as preparation method and application thereof

A technology of nano-titanium dioxide and lignin carbon, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, and water treatment of special compounds. It can solve problems such as uneven distribution, restricted development, and large particles of titanium dioxide. Improvement of photocatalytic efficiency and effect of small particle size

Active Publication Date: 2019-03-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since butyl titanate was directly added to the ethanol-water mixture solution of lignin during the preparation process, resulting in its hydrolysis too fast, the particle size of the prepared titanium dioxide was relatively large, and there was no strong interaction between sodium lignosulfonate and titanium dioxide. force, resulting in a small amount of lignin coated on the surface of titanium dioxide, uneven distribution, and limited improvement in the performance of the composite photocatalyst
[0006] In the preparation of the existing lignin carbon / titanium dioxide composite photocatalyst, because the titanium dioxide precursor titanium alkoxide is easily hydrolyzed, it cannot be well dispersed in the lignin solution, so the precursor can only be slowly added to the lignin aqueous solution. As a result, the obtained titanium dioxide particles are larger, and there is no strong force between titanium dioxide and lignin, and the coating amount of lignin is small
These factors greatly limit the development of lignin-based carbon / nano-TiO2 photocatalysts using lignin as a carbon source

Method used

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  • Lignin carbon/nano titanium dioxide composite photocatalyst as well as preparation method and application thereof
  • Lignin carbon/nano titanium dioxide composite photocatalyst as well as preparation method and application thereof
  • Lignin carbon/nano titanium dioxide composite photocatalyst as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0062] Prepare 2g / L lignosulfonate solution and 2g / L C 14 TAB solution, mix C with a volume ratio of 2:10 14 The TAB solution is added to the lignosulfonate solution, and the precipitate is separated and dried to obtain a lignin complex. Dissolve 1.0 parts by volume of butyl titanate in 9 parts by volume of ethanol, add 1.0 parts by mass of lignin compound, stir evenly, then slowly add dropwise to 30 parts by volume of water with a pH of 5, and stir at room temperature for 40 minutes. The composite solution was centrifuged, washed twice with distilled water, and dried at 80° C. for 4 h. The obtained solid was ground into a powder, and then 2 Calcined at 500° C. for 2 h under protection, and cooled to room temperature to obtain a lignin carbon / nano-titanium dioxide composite photocatalyst.

Embodiment 2

[0064] Prepare 2g / L lignosulfonate solution and 2g / L C 14 TAB solution, mix C with a volume ratio of 2:10 14 The TAB solution is added to the lignosulfonate solution, and the precipitate is separated and dried to obtain a lignin complex. Dissolve 1.0 parts by volume of butyl titanate in 9 parts by volume of ethanol, add 0.5 parts by mass of lignin compound, stir evenly, then slowly add dropwise to 30 parts by volume of water with a pH of 5, and stir at room temperature for 40 minutes. The composite solution was centrifuged, washed twice with distilled water, and dried at 80° C. for 4 h. The obtained solid was ground into a powder, and then 2 Calcined at 600° C. for 2 h under protection, and cooled to room temperature to obtain a lignin carbon / nano-titanium dioxide composite photocatalyst.

Embodiment 3

[0066] Prepare 3g / L lignosulfonate solution and 3g / L C 14 TAB solution, mix C with a volume ratio of 3:10 14The TAB solution is added to the lignosulfonate solution, and the precipitate is separated and dried to obtain a lignin complex. Dissolve 1.0 parts by volume of butyl titanate in 9 parts by volume of ethanol, add 0.5 parts by mass of lignin compound, stir evenly, then slowly drop into 30 parts by volume of water with a pH of 5, and stir at room temperature for 40 minutes. The composite solution was centrifuged, washed twice with distilled water, and dried at 80° C. for 4 h. The obtained solid was ground into a powder, and then 2 Calcined at 700° C. for 2 h under protection, and cooled to room temperature to obtain a lignin carbon / nano-titanium dioxide composite photocatalyst.

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Abstract

The invention belongs to the technical field of a composite nano material, and discloses a lignin carbon / nano titanium dioxide composite photocatalyst as well as a preparation method and application in the field of photocatalysis. The preparation method comprises the following steps: mixing lignosulfonate and alkyl trimethyl ammonium bromide, and performing the hydrophobic modification to obtain alignin complex; adding the lignin complex and titanium alkoxides into ethanol to obtain an ethanol solution, adding the ethanol solution into an aqueous solution, and stirring and reacting to obtaina lignin / TiO2 compound; and heating and calcining to obtain the lignin carbon / nano titanium dioxide composite photocatalyst. The particle size of the titanium dioxide in the lignin carbon / nano titanium dioxide composite photocatalyst prepared by virtue of the method of the invention is small, and the titanium dioxide is uniform distributed; and the photocatalytic efficiency can be significantly improved, the degradation rate for a rhodamine solution is seven times of that of Degussa P25, the lignin carbon / nano titanium dioxide composite photocatalyst can be applied to the field of photocatalysis, and has the potential application value particularly in the field of photocatalytically degrading organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of composite nanomaterial preparation, in particular to a lignin carbon / nano titanium dioxide composite photocatalyst, a preparation method thereof and an application in the field of photocatalysis. Background technique [0002] In recent years, with the development of society, the organic wastewater discharged in the production process of textiles and fine chemicals has caused serious environmental pollution problems, which has been highly valued by researchers around the world. As a new and effective green technology, photocatalysis technology has important application prospects in the fields of environment and energy. As an excellent semiconductor material, nano-titanium dioxide has the advantages of stable chemical properties, corrosion resistance, acid and alkali resistance, and low cost. It is widely used as a photocatalyst and can be used to degrade organic pollutants in water. [0003] However, the ...

Claims

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Application Information

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IPC IPC(8): B01J21/18C02F1/30C02F101/30
CPCC02F1/30B01J21/18C02F2101/308C02F2305/10B01J35/39
Inventor 杨东杰张宾朋邱学青王欢楼宏铭钱勇刘伟峰
Owner SOUTH CHINA UNIV OF TECH
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