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Preparation method and application of silver-loaded titanium dioxide nanotube-magnetic chitosan/β-cyclodextrin composite material

A technology of titanium dioxide and composite materials, applied in chemical instruments and methods, oxidized water/sewage treatment, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem of low photocatalytic efficiency, low utilization rate of sunlight, impact Problems such as the breadth of TiO, to achieve the effect of large specific surface area, easy industrial production, and full contact

Inactive Publication Date: 2018-03-23
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 pH...

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 pH...

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Abstract

The invention discloses 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. This method mainly uses titanium dioxide nanotubes as the matrix, directional loading of silver particles on the surface, and then cross-linking with magnetically modified chitosan / β-cyclodextrin to synthesize a composite with excellent degradation performance for organic dyes under natural light. Material. The main technical features are: adding P25-TiO2 powder, NaOH solution, AgNO3 solution, β-cyclodextrin, chitosan and glutaraldehyde in a certain proportion. The material was obtained by washing and drying with ultrapure water, 0.3-0.4% (mass percent concentration) HCl, and ethanol respectively. It has a strong degradation ability to chrome black T, and the photocatalytic degradation speed is fast. The degradation rate can reach more than 95% under natural light, and it has the advantages of easy separation and recycling.

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 Patents(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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