Preparation method and application of immobilized photocatalyst PVDF-TiO2@g-C3N4 fiber pad

A technology of photocatalyst and fiber mat, applied in the field of photocatalysis, can solve the problems of photocatalytic performance to be improved, inability to effectively control heterojunction, complex preparation method, etc., achieve excellent photocatalytic activity, easy separation and recycling, preparation method simple effect

Inactive Publication Date: 2021-02-19
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the current g-C 3 N 4 with TiO 2 A lot of research has been done on the construction of heterojunctions, but usually the g-C 3 N 4 with TiO 2 After simple mixing and disordered calcination to form a composite material, the preparation method is complicated, and the heterojunction cannot be effectively controlled to form a tight and uniform heterojunction between the two, and the photocatalytic performance needs to be improved

Method used

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  • Preparation method and application of immobilized photocatalyst PVDF-TiO2@g-C3N4 fiber pad
  • Preparation method and application of immobilized photocatalyst PVDF-TiO2@g-C3N4 fiber pad
  • Preparation method and application of immobilized photocatalyst PVDF-TiO2@g-C3N4 fiber pad

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Experimental program
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Effect test

Embodiment 1

[0030] Preparation of PVDF-TiO 2 @g-C 3 N 4 Fiber pad:

[0031] (1) Dissolve 10g of urea in 10mL of deionized water, then add 1g of anatase titanium dioxide, vacuumize to -0.08MPa and stir to obtain a uniform solution. After centrifugation and water washing, vacuum dry at 60°C for 12h, and grind to obtain a catalyst precursor body, the catalyst precursor was calcined at 520°C under nitrogen atmosphere for 2h to obtain the following figure 1 TiO shown 2 @g-C 3 N 4 catalyst;

[0032] (2) Add 0.2g TiO 2 @g-C 3 N 4 Catalyst, polyvinylidene fluoride and polyvinylpyrrolidone with a mass fraction ratio of 8%:2% were dissolved in 5mL N-N dimethylacetamide and 5mL acetone solution, stirred at 60°C and cooled to room temperature, followed by ultrasonication to obtain the precursor body solution;

[0033] (3) The precursor solution is passed through an electrospinning process. The electrospinning process conditions are that the DC voltage is 15kV, the flow rate of the syringe ...

Embodiment 2

[0037] Preparation of PVDF-TiO 2 @g-C 3 N 4 Fiber pad:

[0038] (1) Dissolve 8g of urea in 10mL of deionized water, then add 1g of anatase titanium dioxide, vacuumize to -0.08MPa and stir to obtain a uniform solution. After centrifugation and water washing, vacuum-dry at 60°C for 12h, and grind to obtain a catalyst precursor body, the catalyst precursor was calcined at 520°C under nitrogen atmosphere for 2h to obtain TiO 2 @g-C 3 N 4 catalyst;

[0039] (2) Add 0.2g TiO 2 @g-C 3 N 4 Catalyst, polyvinylidene fluoride and polyvinylpyrrolidone with a mass fraction ratio of 8%:2% were dissolved in 5mL N-N dimethylacetamide and 5mL acetone solution, stirred at 60°C and cooled to room temperature, followed by ultrasonication to obtain the precursor body solution;

[0040] (3) The precursor solution is passed through an electrospinning process, and the electrospinning process conditions are a DC voltage of 15kV, a syringe pump flow rate of 1.5mL / h, a receiving distance of 15...

Embodiment 3

[0044] Preparation of PVDF-TiO 2 @g-C 3 N 4 Fiber pad:

[0045] (1) Dissolve 12g of urea in 10mL of deionized water, then add 1g of anatase titanium dioxide, vacuumize to -0.08MPa and stir to obtain a uniform solution. After centrifugation and water washing, vacuum-dry at 60°C for 12h, and grind to obtain a catalyst precursor body, the catalyst precursor was calcined at 520°C under nitrogen atmosphere for 2h to obtain TiO 2 @g-C 3 N 4 catalyst;

[0046] (2) Add 0.2g TiO 2 @g-C 3 N 4 Catalyst, polyvinylidene fluoride and polyvinylpyrrolidone with a mass fraction ratio of 10%:2% were dissolved in 5mL N-N dimethylacetamide and 5mL acetone solution, stirred at 60°C and cooled to room temperature, followed by ultrasonication to obtain the precursor body solution;

[0047] (3) The precursor solution is passed through an electrospinning process. The electrospinning process conditions are that the DC voltage is 20kV, the flow rate of the syringe pump is 2mL / h, the receiving ...

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Abstract

The invention discloses a preparation method of an immobilized photocatalyst PVDF-TiO2@g-C3N4 fiber pad; a photocatalyst TiO2@g-C3N4 with a special core-shell structure is prepared by a one-step in-situ synthesis method and by regulating and controlling the mass ratio of urea to anatase titanium dioxide, the preparation method is simple, a compact and uniform heterojunction structure can be formed, compounding of photo-induced electrons-holes is effectively inhibited, and excellent photocatalytic activity is achieved; then the electrospinning technology is used, and the TiO2@g-C3N4 catalyst isfixed on a PVDF fiber pad; the preparation method has the advantages that the preparation method is simple, the fiber structure can be effectively regulated and controlled, the separation and the recycling are easy, and the wide application prospect is realized.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, in particular to an immobilized photocatalyst PVDF-TiO 2 @g-C 3 N 4 Preparation method of fiber mat and application thereof. Background technique [0002] In China, with the rapid development of the livestock and poultry breeding industry, the excessive use and even abuse of antibiotics are common. Because antibiotics cannot be completely absorbed collectively, 60-90% of antibiotics will be metabolized out of the body, and finally enter the environment in the form of wastewater, causing serious antibiotic pollution. If antibiotic pollution is not controlled, on the one hand, bacterial resistance will gradually increase, and on the other hand, the cumulative effect of antibiotics will seriously endanger human health and the ecological environment. Therefore, it is particularly important to treat antibiotics in wastewater. [0003] As an environmentally friendly technology, photocatalyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06C02F1/30C02F101/30
CPCB01J31/06B01J35/004C02F1/30C02F2101/30C02F2305/10
Inventor 郑艳梅郑夏蓉李清彪
Owner XIAMEN UNIV
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