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A silver-enhanced lignin carbon/nano-titanium dioxide composite photocatalyst and its preparation method and application

A technology of nano-titanium dioxide and lignin carbon, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. High cost of raw materials and other issues, to achieve the effect of improving photocatalytic efficiency, low price, and uniform distribution

Active Publication Date: 2020-05-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of raw materials is relatively high, and the silver element has no strong interaction with the surface of titanium dioxide, which also has the problem that the silver element is easy to fall off, which is not conducive to the reuse of the catalyst.

Method used

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  • A silver-enhanced lignin carbon/nano-titanium dioxide composite photocatalyst and its preparation method and application
  • A silver-enhanced lignin carbon/nano-titanium dioxide composite photocatalyst and its preparation method and application
  • A silver-enhanced lignin carbon/nano-titanium dioxide composite photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 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, then add 0.5 parts by mass of lignin compound and 0.4 parts by mass of silver nitrate, stir evenly, and then slowly add it dropwise to 30 parts by volume of distilled water, at 70 Stir at ℃ for 2h. 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 2h under protection, and cooled to room temperature to obtain a silver-enhanced lignin carbon / nano-titanium dioxide composite photocatalyst.

Embodiment 2

[0061] 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 titanium tetrachloride in 9 parts by volume of ethanol, add 0.5 parts by mass of lignin compound and 0.4 parts by mass of silver nitrate, stir evenly, and then slowly add it dropwise to 30 parts by volume of distilled water, at 70 Stir at ℃ for 2h. 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 2h under protection, and cooled to room temperature to obtain a silver-enhanced lignin carbon / nano-titanium dioxide composite photocatalyst.

Embodiment 3

[0063] Prepare 3g / L lignosulfonate solution and 3g / L C 14 TAB solution, mix C with a volume ratio of 3:10 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 and 0.4 parts by mass of silver chlorate, stir evenly, and then slowly add it dropwise to 30 parts by volume of distilled water. Stir at 70°C for 2h. 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 2h under protection, and cooled to room temperature to obtain a silver-enhanced lignin carbon / nano-titanium dioxide composite photocatalyst.

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Abstract

The invention belongs to the technical field of preparation of composite nano materials, and discloses a silver enhanced lignin carbon / nano titanium dioxide compounded photocatalyst, a preparation method thereof and application of the silver enhanced lignin carbon / nano titanium dioxide compounded photocatalyst in the field of photocatalysis. The method comprises the following steps: mixing lignosulphonate with alkyl trimethyl ammonium bromide and carrying out hydrophobic modification to obtain a lignin complex; adding the lignin complex, a titanium dioxide precursor and a water-soluble silversalt in ethanol to obtain an ethanol solution, adding the ethanol solution in water and reacting to obtain a Ag / lignin / TiO2 compound; and heating and calcining to obtain the silver enhanced lignin carbon / nano titanium dioxide compounded photocatalyst. The invention further provides the silver enhanced lignin carbon / nano titanium dioxide compounded photocatalyst prepared by the method and application of the silver enhanced lignin carbon / nano titanium dioxide compounded photocatalyst in the field of photocatalysis. The silver enhanced lignin carbon / nano titanium dioxide compounded photocatalysthas good photocatalytic degradation effect on sulfamethazine as antibiotic, and the degradation rate is 6.3 tims that of commercial Degussa P25 under the condition of visible light.

Description

technical field [0001] The invention belongs to the technical field of composite nanomaterial preparation, and in particular relates to a silver-enhanced lignin carbon / nano-titanium dioxide composite photocatalyst, a preparation method thereof, and an application in the field of photocatalysis. Background technique [0002] With the development of the society and the progress of the economy, while the chemical industry brings convenience to people's life, it also discharges a large amount of organic wastewater, causing serious pollution to the environment and becoming the main problem restricting the survival and development of human beings. Photocatalytic technology has wide applicability and high efficiency, and provides a new and effective solution for degrading toxic and harmful organic pollutants in the environment. Titanium dioxide is widely used as a photocatalyst to degrade organic pollutants in water because of its stable chemical properties, corrosion resistance, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J35/00C02F1/30C02F101/38
CPCB01J23/50B01J35/004C02F1/30C02F2101/305C02F2101/40C02F2305/10
Inventor 杨东杰张宾朋邱学青张哲琨黄锦浩易聪华
Owner SOUTH CHINA UNIV OF TECH
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