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Preparation method of silver-loaded titania nanotube-magnetic chitosan/beta-cyclodextrin composite material and application thereof

A technology of titanium dioxide and composite materials, which is applied in chemical instruments and methods, oxidized water/sewage treatment, organic compound/hydride/coordination complex catalysts, etc. Low efficiency and other problems, to achieve the effects of easy industrial production, full contact, and large specific surface area

Inactive Publication Date: 2016-08-10
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Anatase TiO 2 The bandgap width of TiO is wide (Eg=3.2 eV), which can only be excited by ultraviolet light, the utilization rate of sunlight is low, and the photogenerated electrons-holes are easy to recombine, resulting in low photocatalytic efficiency and affecting TiO 2 breadth of application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of chitosan / β-cyclodextrin composite material: add β-cyclodextrin and chitosan into a three-necked flask with HCl with a mass concentration of 30-40% at a mass ratio of 6:1, and stir Uniform milky white solution was obtained, which became colorless when heated. Add 3 mL of 50% glutaraldehyde at 85 °C, react for 1 h, adjust the pH to 7~8 with 1 mol / L NaOH, cool, filter, 60 ℃ vacuum drying to obtain chitosan / β-cyclodextrin composite material;

[0022] (2) Preparation of chitosan / β-cyclodextrin magnetic material: Dissolve an appropriate amount of chitosan / β-cyclodextrin composite material in 2% acetic acid, and sonicate until dispersed and dissolved at room temperature. Add an appropriate amount of magnetic particles into the dispersed solution, stir for 1 h, and add 25% glutaraldehyde cross-linked chitosan to the mixed solution. The mixture was stirred at 40 °C for 90 min, adjusted to pH 9-10 with 1 mol / L sodium hydroxide, and stirred at 70 °C for 1 h. W...

Embodiment 2

[0026] (1) Preparation of chitosan / β-cyclodextrin composite material: β-cyclodextrin and chitosan were added to a three-necked HCl flask with a mass percent concentration of 30-40% at a mass ratio of 5:1 , stir evenly to obtain a milky white solution, which becomes colorless when heated, add 6 mL of 25% glutaraldehyde at 80 °C, react for 1 h and turn into light yellow, adjust the pH to 7~ with 1 mol / L NaOH 8. Turn brown, cool, precipitate, filter, and vacuum-dry at 50°C to obtain chitosan / β-cyclodextrin composite material;

[0027] (2) Preparation of chitosan / β-cyclodextrin magnetic material: Dissolve 0.4 g of chitosan / β-cyclodextrin composite material in 100 mL of 2% acetic acid, and sonicate until dispersed and dissolved at room temperature. Add an appropriate amount of magnetic particles into the dispersed solution, stir for 1 h, and add 15 mL of 25% glutaraldehyde cross-linked chitosan to the mixed solution. The mixture was stirred at 40 °C for 90 min. Then, adjust the p...

Embodiment 3

[0031] (1) Preparation of chitosan / β-cyclodextrin composite material: β-cyclodextrin and chitosan were added to a three-necked HCl flask with a mass percent concentration of 30-40% at a mass ratio of 6:1 , stir evenly to obtain a milky white solution, which becomes colorless when heated, add 6 mL of 25% glutaraldehyde at 85 °C, react for 1 h and turn into light yellow, adjust the pH to 7~ with 1 mol / L NaOH 8. Turn brown, cool, precipitate, filter, and vacuum-dry at 60°C to obtain chitosan / β-cyclodextrin composite material;

[0032] (2) Preparation of chitosan / β-cyclodextrin magnetic material: Dissolve 0.5 g of chitosan / β-cyclodextrin composite material in 100 mL of 2% acetic acid, and sonicate until dispersed and dissolved at room temperature. Add an appropriate amount of magnetic particles into the dispersed solution, stir for 1 h, and add 15 mL of 25% glutaraldehyde cross-linked chitosan to the mixed solution. The mixture was stirred at 40 °C for 90 min. Then, adjust the p...

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Abstract

The invention discloses a preparation method of a novel silver-loaded titania nanotube-magnetic chitosan / beta-cyclodextrin composite material and an application of the composite material in printing and dyeing wastewater treatment. According to the method, titania nanotube is used as a matrix, silver particles are directionally loaded on the surface of the titania nanotube, and the silver-loaded titania nanotube is cross-linked with magnetically modified chitosan / beta-cyclodextrin so as to synthesize a composite material having excellent degradation property on organic dyestuff under natural light. The preparation method is mainly technically characterized in that P25-TiO2 powder, a NaOH solution, an AgNO3 solution, beta-cyclodextrin, chitosan and glutaraldehyde are added according to a certain ratio; and ultrapure water, 0.3-0.4% (mass percentage concentration) HCl and ethanol are respectively used for washing, and drying is finally carried out to obtain the material. The composite material has strong degradation property on eriochrome black T, has fast photocatalytic degradation speed, and is easy to separate and recovery. Degradation rate under natural light can reach 95% and above.

Description

technical field [0001] The present invention relates to a preparation method and application technology of a photocatalyst, in particular to a preparation method of a novel silver-loaded titanium dioxide nanotube-magnetic chitosan / β-cyclodextrin composite material and its application in the treatment of printing and dyeing wastewater technology. Background technique [0002] With the acceleration of the industrialization process, the discharge of various production wastewater is also increasing. Among them, the composition of printing and dyeing wastewater is relatively complex, the concentration is high, the color is deep, and there are relatively many refractory substances, so it is difficult to use conventional methods. to process. Some dye components remaining in printing and dyeing wastewater, even if the concentration is very low, once discharged into the water body, it will also cause damage to the entire water body ecosystem, and its content of toxic and organic com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38C02F1/30C02F1/72C02F103/30
CPCC02F1/30C02F1/725B01J31/065B01J31/38C02F2305/10C02F2103/30B01J35/33B01J35/39Y02W10/37
Inventor 丁超凡罗川南王晓娇段辉敏王延辉李剑波孙元玲
Owner UNIV OF JINAN
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