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Preparation method for porous inorganic photocatalytic composite nanometer fiber

A composite nanofiber and photocatalytic technology, applied in chemical instruments and methods, fiber treatment, catalyst carrier, etc., can solve the problems of poor reusability, difficulty in recycling, loss, etc., and achieve the effect of solving photocorrosion and maintaining photocatalytic activity

Inactive Publication Date: 2014-09-10
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, because the particle size of nano photocatalyst is too small, it is difficult to recycle during use, and it is easy to cause loss after use, and the reusability is poor.
In addition, photocatalysts have the characteristics of non-selective catalytic decomposition of a large number of high-concentration organic / inorganic substances, which may cause photocorrosion to the substrate materials that are in direct contact with them.

Method used

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  • Preparation method for porous inorganic photocatalytic composite nanometer fiber
  • Preparation method for porous inorganic photocatalytic composite nanometer fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0033] At room temperature, stir and dissolve 5.00g PAN, 0.50g tetraethyl orthosilicate in 15mL N,N-dimethylformamide solution, this solution is used as the outer layer solution; similarly, with 4.0g PEO, 0.50g titanic acid Ethyl ester was stirred in 15 mL of N,N-dimethylformamide solvent until the solid was completely dissolved, and this solution was used as the inner layer solution. Input the configured coaxial electrospinning solution to the outer layer and inner layer of the coaxial needle at the flow rate of 0.015mL / min and 0.010mL / min respectively, and connect the coaxial needle to the 18Kv high-voltage electrostatic generator at the same time, with tin foil The fiber is accepted, and the acceptance distance is 15 cm to obtain the composite nanofiber. After the composite nanofibers are dried, the composite nanofibers are heated from room temperature at 10 °C / min to 450 °C for 1 h in the nitrogen atmosphere of the muffle furnace, and then naturally cooled to room temperat...

Embodiment 2

[0035]At room temperature, dissolve 6.0g PVP and 2.0g propyl orthosilicate in 15mL absolute ethanol, stir until the solid is completely dissolved, and use this solution as the outer layer solution; Esters in 15mL of absolute ethanol, the solution as the inner layer solution. Input the configured coaxial electrospinning solution to the outer layer and inner layer of the coaxial needle at the flow rate of 0.02mL / min and 0.02mL / min respectively, and connect the coaxial needle to a 20Kv high-voltage electrostatic generator at the same time, with tin foil The fiber is accepted, and the acceptance distance is 10 cm, and the composite nanofiber is obtained. After the composite nanofibers were dried, the temperature was raised from room temperature at 10 °C / min to 400 °C for 2 h in a nitrogen atmosphere of a muffle furnace, and then naturally cooled to room temperature to obtain porous inorganic photocatalytic composite nanofibers.

Embodiment 3

[0037] Dissolve 8.5g of PEO, 4.0g of butyl orthosilicate in 15mL of N,N-dimethylformamide / ethanol (v / v = 1:1) at room temperature, stir until the solid is completely dissolved, and use this solution as layer solution; similarly, mix 11.0g PVP, 4.5g tetrabutyl titanate in 15mL N,N-dimethylformamide / ethanol (v / v = 1:1), stir until the solid is completely dissolved, and this solution is used as the inner layer solution. Input the configured coaxial electrospinning solution to the outer layer and inner layer of the coaxial needle at the flow rate of 0.008mL / min and 0.005mL / min respectively, and connect the coaxial needle to a 25Kv high-voltage electrostatic generator at the same time, with tin foil The fiber is accepted, and the acceptance distance is 10 cm, and the composite nanofiber is obtained. After the composite nanofibers were dried, the composite nanofibers were heated from room temperature to 350 °C at a rate of 10 °C / min for 3 h in the nitrogen atmosphere of the muffle ...

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Abstract

A preparation method for porous inorganic photocatalytic composite nanometer fiber comprises the following steps: a) mixing a high-molecular spinning base material and an organic silicate, adding a solvent and stirring uniformly, so as to prepare a surface-layer spinning solution of a coaxial electrospinning solution, mixing a high-molecular spinning base material and an organic titanate, adding a solvent and stirring uniformly, so as to prepare a core-layer spinning solution of the coaxial electrospinning solution; b) respectively inputting the surface-layer spinning solution and the core-layer spinning solution into a coaxial syringe needle with constant flow velocity and a constant flow-velocity ratio for performing coaxial high-voltage electrospinning preparation, so as to obtain composite nanometer fiber; and c) performing high-temperature processing on the composite nanometer fiber at nitrogen atmosphere to remove a high-molecular spinning base material in the composite nanometer fiber, and then naturally cooling to room temperature, so as to obtain the porous inorganic photocatalytic composite nanometer fiber. According to the preparation method, the tradition that a photocatalyst is supported on the surface of a carrier is changed, instead, the catalyst is supported in a carrier material, so that the specific surface area for photocatalysis is relatively substantially increased, the photocatalytic activity of the composite photocatalytic material is improved, and the photocorrosion problem of the photocatalytic material to a base material is effectively solved.

Description

technical field [0001] The invention relates to a preparation method of a porous inorganic photocatalytic composite nanofiber material, belonging to the technical field of inorganic nanofiber materials. Background technique [0002] With the continuous progress of human society, the environment in which human beings live is deteriorating day by day, and the non-renewable fossil energy they rely on is constantly being consumed. Reasonably and effectively solving these thorny problems faced by human society will be the best choice to realize the sustainable development of human society. Among them, solar energy is one of the earliest clean energy sources used by human beings. In addition to simply and directly using solar energy, how to convert and indirectly utilize solar energy will also be a very effective way. [0003] Since TiO 2 Since the dechlorination of polychlorinated biphenyls, which is a refractory organic substance, has opened up a new direction for the applicat...

Claims

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Application Information

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IPC IPC(8): D01F8/08D01F8/16D01F8/10D01F11/04D01F1/10D01D5/00D01D5/34B01J21/06B01J35/06B01J35/10B01J32/00
Inventor 江国华江腾腾魏征万军明
Owner ZHEJIANG SCI-TECH UNIV
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