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Preparation method of titanium dioxide/active carbon composite nanofibrous membrane

A technology of composite nanofibers and titanium dioxide, applied in chemical instruments and methods, oxidized water/sewage treatment, alkali metal oxides/hydroxides, etc., can solve uneven dispersion of TiO, low photocatalytic activity and adsorption capacity, and blockage Nozzle and other problems, to achieve high application value, simple method, and improve the effect of adsorption performance

Inactive Publication Date: 2011-04-20
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported in the literature that nano-TiO2 is dispersed into polyacrylonitrile (PAN) solution, and titanium dioxide / PAN fiber (activated carbon fiber) is prepared by electrospinning, but there is TiO2 Uneven dispersion, accumulation and clogging of nozzles
There are also reports of mixing tetra-n-butyl titanate with polyacrylonitrile (PAN) solution to prepare fibers by direct electrospinning. The biggest disadvantage is that the photocatalytic activity and adsorption capacity are very low.

Method used

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  • Preparation method of titanium dioxide/active carbon composite nanofibrous membrane
  • Preparation method of titanium dioxide/active carbon composite nanofibrous membrane
  • Preparation method of titanium dioxide/active carbon composite nanofibrous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Under the condition of magnetic stirring, dissolve 8.5mL tetra-n-butyl titanate and 2.4mL glacial acetic acid in 17mL absolute ethanol, stir for 30 minutes to mix well, and slowly drop into the mixed solution of 5mL ethanol and 0.5mL distilled water , control the dropping rate of the burette to 1 drop / 3 seconds, seal and stir for 1 hour to obtain a light yellow transparent sol of titanium hydroxide, and let it stand for aging.

[0030] (2) Slowly add 2g of polyacrylonitrile powder into 15mL N,N-dimethylformamide solvent to obtain a polyacrylonitrile solution with a concentration of 11.7wt%, stir until it swells completely, and then place it in a water bath Slowly heat to 40°C and stir for 30 minutes to dissolve completely. Mix the prepared solution with the above prepared titanium hydroxide sol at a volume ratio of 1:4, and magnetically stir until uniformly mixed to obtain a transparent solution for power spinning.

[0031] (3) Take about 15mL of the above polymer so...

Embodiment 2

[0036] (1) Under the condition of magnetic stirring, dissolve 8.5mL tetra-n-butyl titanate and 2.4mL glacial acetic acid in 17mL absolute ethanol, stir for 30 minutes to mix well, and slowly drop into the mixed solution of 5mL ethanol and 0.5mL distilled water , control the dropping rate of the burette to 1 drop / 3 seconds, seal and stir for 1 hour to obtain a light yellow transparent sol of titanium hydroxide, and let it stand for aging.

[0037] (2) Slowly add 2.5g of polyacrylonitrile powder into 17.5mL N,N-dimethylformamide solvent to obtain a polyacrylonitrile solution with a concentration of 12.5wt%, stir until it swells completely, and place Heat slowly to 40°C in a water bath, stir for 30 minutes to dissolve completely. The prepared solution and the prepared titanium hydroxide sol were magnetically stirred at a volume ratio of 2.5:17.5:2 until uniformly mixed to obtain a transparent solution for power spinning.

[0038] (3) Take about 15mL of the above polymer solution...

Embodiment 3

[0043] (1) Under the condition of magnetic stirring, dissolve 8.5mL tetra-n-butyl titanate and 2.4mL glacial acetic acid in 17mL absolute ethanol, stir for 30 minutes to mix well, and slowly drop into the mixed solution of 5mL ethanol and 0.5mL distilled water , control the dropping rate of the burette to 1 drop / 3 seconds, seal and stir for 1 hour to obtain a light yellow transparent sol of titanium hydroxide, and let it stand for aging.

[0044] (2) Slowly add 3g of polyacrylonitrile powder into 17mL N,N-dimethylformamide solvent to obtain a polyacrylonitrile solution with a concentration of 15wt%, stir until it swells completely, and then place it in a water bath for slow Heat slowly to 40°C and stir for 30 minutes to dissolve completely. Magnetically stir the prepared solution and the prepared titanium hydroxide sol at a volume ratio of 3:17:3 until uniformly mixed to obtain a transparent solution for power spinning.

[0045] (3) Take about 15mL of the above polymer soluti...

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Abstract

The invention provides a preparation method of a titanium dioxide / active carbon composite nanofibrous membrane, characterized by comprising the following specific steps: dissolving polyacrylonitrile powder in N, N-dimethyl formamide; mixing titanium hydroxide gel with the polyacrylonitrile solution to obtain electrostatic spinning stock solution, and performing electrostatic spinning to get the composite nanofibrous membrane; placing the composite nanofibrous membrane in an electrically heated drying cabinet for being pre-oxidized; soaking the composite nanofibrous membrane in phosphoric acid or potassium hydroxide solution, washing the solution to be neutral by distilled water, and drying the composite nanofibrous membrane in the drying cabinet; and then, under nitrogen protection, heating up to 450-550 DEG C, and cooling to room temperature to get the titanium dioxide / active carbon composite nanofibrous membrane. The preparation method improves combination firmness between fibers and active ingredients of a photocatalyst, and also improves charge capacity of the fibers; the titanium dioxide / active carbon composite nanofibrous membrane is high in photo catalytic activity, good in absorption effect, reproducible and simple in a reproduction method, and can use sunlight, so that operations are easy and operation cost is low.

Description

technical field [0001] The invention relates to a preparation method of a titanium dioxide / activated carbon composite nanofiber membrane, and belongs to the technical field of nanofiber membrane materials. Background technique [0002] Environmental pollution control is a major issue faced and solved by human society, and photocatalytic oxidation is an effective means to eliminate refractory pollutants in the environment. TiO 2 Photocatalysts have the advantages of no photocorrosion after irradiation, good acid and alkali resistance, and stable chemical properties. Molecules, produce hydroxyl radicals with strong oxidizing ability [Carp O., Huisman C.L., Reller A., ​​2004. Photoinduced reactivity of titanium dioxide. Progress in Solid State Chemistry 32: 33~177.], so that organic pollutants can be mined change. Due to the small size of titanium dioxide particles, it is difficult to separate and recycle in the sewage treatment process, which is inconvenient for practical a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/18D01F11/00D01D5/00D01D1/02B01J20/20B01J20/28B01J20/30C02F1/28C02F1/30C02F1/72
CPCY02W10/37
Inventor 陈泉源杜菲菲薛罡柳欢欢罗周
Owner DONGHUA UNIV
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