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Preparation method of BN quantum dot combined photocatalytic composite fiber

A composite fiber and photocatalytic technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, nano optics, etc., can solve the problems of weak combination and few active sites, so as to improve the efficiency of photocatalytic reaction and suppress loading. The effects of jet recombination and good application prospects

Active Publication Date: 2020-07-10
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for preparing BN quantum dot-bonded photocatalytic composite fiber, which solves the problems in the prior art that there are few active sites at the junction of BN and photocatalytic materials and the combination is not firm

Method used

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  • Preparation method of BN quantum dot combined photocatalytic composite fiber
  • Preparation method of BN quantum dot combined photocatalytic composite fiber
  • Preparation method of BN quantum dot combined photocatalytic composite fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Preparation of BN quantum dot-bound TiO2 composite fiber

[0054] Put 3.5g of isopropyl titanate, 1g of PVP, 6g of DMF and 2g of glacial acetic acid into the propulsion pump, adjust the spinning voltage to 18kv, the receiving distance to 18cm, and the spinning temperature to 30°C. The humidity is 10%, the propulsion pump propulsion speed is 0.3mL / h, electrospinning is carried out, and then calcined at 550°C for 2h to obtain TiO2 nanofibers;

[0055] TiO2 nanofibers were immersed in deionized water (concentration of 1mol / L) dissolved with sodium nitrate, and irradiated with a UV lamp with a power of 300W and a light emission wavelength of 290nm for 1h to obtain modified TiO2fibers;

[0056] The modified TiO2 fibers are subjected to hydrothermal treatment: take 0.17g melamine and 0.5g boric acid and add them to 40g deionized water, stir them evenly and then move them to the reactor. The volume of the solution is 80% of the volume of the reactor. Put the modified TiO2 fibe...

Embodiment 2

[0059] Preparation of BN quantum dot-bound TiO2 composite fiber

[0060] Put 1.35g of butyl titanate, 0.9g of PVP, 12.52g of ethanol and 0.23g of acetic acid into the propulsion pump, adjust the spinning voltage to 16kv, the receiving distance to 16cm, and the spinning temperature to 30°C , the humidity is 10%, the propelling speed of the propulsion pump is 0.6mL / h, electrospinning is carried out, and then calcined at 500°C for 2h to obtain TiO2 nanofibers;

[0061] Dip the TiO2 nanofibers into deionized water (concentration of 1mol / L) dissolved with ammonium nitrate, and irradiate with a UV lamp with a power of 300W and a light emission wavelength of 390nm for 2h to obtain modified TiO2fibers;

[0062] The modified TiO2 fibers are subjected to hydrothermal treatment: take 0.136g melamine and 0.4g boric acid and add them to 40g deionized water, stir them evenly and then move them to the reactor. The volume of the solution is 80% of the volume of the reactor. Put the modified T...

Embodiment 3

[0065] Preparation of BN Quantum Dot-Combined ZnO Composite Fibers

[0066] Mix 0.98g of PVA and 8.94g of deionized water in a 90°C water bath, then add 2.52g of zinc acetate and 1.56g of acetic acid, mix to form a uniform spinning solution and put it into the propulsion pump, adjust the spinning voltage to 18kv, and the receiving distance 15cm, the spinning temperature is 30°C, the humidity is 10%, the propulsion pump propulsion speed is 0.4mL / h, electrospinning is carried out, and then calcined at 600°C for 2 hours to obtain ZnO fibers;

[0067] Immerse the ZnO fiber in deionized water (concentration: 1mol / L) dissolved with sodium nitrate, and irradiate it with a UV lamp with a power of 500W and a light emission wavelength of 290nm for 0.5h to obtain a modified ZnO fiber;

[0068] Hydrothermal treatment of the modified ZnO fiber: Take 0.136g melamine and 0.4g boric acid and add it to 40g deionized water, stir evenly and move it to the reactor. The volume of the solution is 8...

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Abstract

The invention discloses a preparation method of a BN quantum dot combined photocatalytic composite fiber. The preparation method is specifically implemented according to the following steps: step 1, preparing a photocatalytic fiber through electrospinning; step 2, hydroxylating the surface of the fiber; step 3, performing hydrothermal synthesis to obtain BN quantum dots; and step 4, carrying out strengthening post-treatment to obtain the BN quantum dot combined photocatalytic composite fiber. According to the method disclosed by the invention, the BN quantum dot / photocatalyst composite interface with a large number of exposed active sites can be obtained; and the BN quantum dots are firmly combined on the surface of the fiber, so that organic dye can be fully adsorbed, the reaction probability of a catalyst and an adsorbate is improved, the exciton dissociation efficiency can be improved, the carrier mobility is improved, photo-excitation charge carrier recombination is inhibited, andthe photocatalytic reaction efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of composite fiber preparation, and relates to a preparation method of BN quantum dot-bonded photocatalytic composite fiber. Background technique [0002] Semiconductor photocatalytic materials such as ZnO, TiO 2 It has the advantages of non-toxicity, good chemical and thermal stability, high catalytic activity, and low price. It has many functions such as exhaust gas purification, sewage treatment, and photolysis of water to produce hydrogen. It has broad application prospects in solving environmental pollution and energy shortages. . However, there are still many problems in the use of photocatalysts, such as the high recombination rate of photogenerated electrons and holes, and the short lifetime of carriers, which all lead to low photocatalytic efficiency, and the photocatalyst particles in the suspension system are easy to agglomerate and difficult to recycle. This seriously hinders the practical appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B82Y20/00B82Y30/00B82Y40/00
CPCB01J27/24B82Y20/00B82Y30/00B82Y40/00B01J35/613B01J35/39Y02W10/37
Inventor 汤玉斐邢国鑫刘照伟李丹赵康吴鲜菇康玲
Owner XIAN UNIV OF TECH
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