Graphene and vanadate composite nano-fiber photocatalyst and preparation method thereof

A technology of composite nanofibers and photocatalysts, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, etc., can solve problems such as miscible problems and undiscovered problems, and achieve rapid Separation, good effect on visible light catalytic degradation ability

Inactive Publication Date: 2015-04-01
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the miscibility of rare earth vanadate precursors and organic solvent systems, there has been no report on the preparation of graphene and vanadate composite nano-photocatalytic fibers by electrospinning.

Method used

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  • Graphene and vanadate composite nano-fiber photocatalyst and preparation method thereof
  • Graphene and vanadate composite nano-fiber photocatalyst and preparation method thereof
  • Graphene and vanadate composite nano-fiber photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Add 1 mmol lanthanum nitrate (La(NO 3 ) 3 ) and 0.5g of polyvinylpyrrolidone were dissolved in 5ml of absolute ethanol, and then 20mg of graphene powder was immersed in it, stirred well and then ultrasonically dispersed for 30 minutes to obtain liquid A. Dissolve 1 mmol of vanadyl acetylacetonate in 5 ml of absolute ethanol to obtain liquid B. Add liquid B to liquid A drop by drop, and stir thoroughly for 4 hours to make a spinning solution.

[0022] (2) The above spinning solution is electrospun into filaments through an electrospinning device to obtain a composite nanofiber felt; the specific steps are:

[0023] Draw the spinning solution into the syringe (capacity 5-20ml is acceptable), the advance speed of the syringe is controlled by a micro constant flow pump, the needle of the syringe (metal material, inner diameter 0.6-1.2mm) is facing down and connected to the positive pole of the high-voltage power supply, and the fiber collecting plate ( Metal thin pla...

Embodiment 2

[0027] (1) Add 1mmol cerium nitrate (Ce(NO 3 ) 3 ) and 0.75g of polyvinylpyrrolidone were dissolved in 5ml of absolute ethanol, and then 30mg of graphene powder was immersed in it, stirred well and then ultrasonically dispersed for 30 minutes to obtain liquid A. Dissolve 1 mmol of vanadyl acetylacetonate in 5 ml of absolute ethanol to obtain liquid B. Add liquid B to liquid A drop by drop, and stir thoroughly for 6 hours to make a spinning solution;

[0028] (2) The above-mentioned spinning solution was electrospun into filaments through an electrospinning device, and a composite nanofiber mat containing graphene, cerium vanadate and polyvinylpyrrolidone was obtained according to the specific process described in step (2) of Example 1.

[0029] (3) Aging the fiber mat obtained in step (2) in the air for 16 hours, and then roasting at 500-600°C for 4 hours in an air atmosphere to remove polyvinylpyrrolidone (PVP), and obtain graphene and cerium vanadate (CeVO 4 ) composite n...

Embodiment 3

[0032] (1) Add 1mmol of praseodymium nitrate (Pr(NO 3 ) 3) and 1g of polyvinylpyrrolidone were dissolved in 5ml of absolute ethanol, and then 20mg of graphene powder was immersed in it, stirred well and then ultrasonically dispersed for 30 minutes to obtain liquid A. Dissolve 1 mmol of vanadyl acetylacetonate in 5 ml of absolute ethanol to obtain liquid B. Add liquid B to liquid A drop by drop, and stir thoroughly for 7 hours to make a spinning solution.

[0033] (2) The above-mentioned spinning liquid is electrospun into filaments through an electrospinning device, and a composite nanofiber mat containing graphene, praseodymium vanadate and polyvinylpyrrolidone is obtained according to the specific process described in step (2) of Example 1.

[0034] (3) Aging the fiber mat obtained in step (2) in the air for 24 hours, and then roasting it in an air atmosphere at 500-600°C for 6 hours to remove polyvinylpyrrolidone to obtain graphene and praseodymium vanadate (PrVO 4 ) com...

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Abstract

The invention discloses a graphene and vanadate composite nano-fiber photocatalyst and a preparation method thereof. The composite nano-fiber photocatalyst is prepared by compounding two components including graphene and vanadate according to a proportion that 10-30mg of the graphene is used when 1mmol of the vanadate is used; and the graphene and vanadate composite nano-fiber photocatalyst is obtained by taking an organic vanadium salt with good alcohol solubility and rare-earth metal nitrate as precursor reactants, preparing a spinning solution by making use of a PVP (polyvinyl pyrrolidone) and ethanol system, uniformly dispersing graphene powder into the spinning solution at the same time, performing electric spinning to form silks by using an electrostatic spinning device, and performing high-temperature roasting. Graphene and vanadate composite fibers show rich porous layer structures and narrower band gap width, show very good visible light catalytic degradation capacity to a contaminant ofloxacin in water, and can be quickly separated from a solution through precipitating.

Description

technical field [0001] The present invention relates to a kind of graphene and vanadate (MVO 4 (M=La, Ce, Pr or Nd)) composite nanofiber photocatalyst and preparation method thereof, belonging to the technical field of preparation of visible light catalytic materials. Background technique [0002] Photocatalytic technology is an emerging technology in the field of energy and environment, among which titanium dioxide is the most researched, which is due to its non-toxic, stable, low-cost and other advantages. However, titanium dioxide photocatalytic materials only have ultraviolet light response and low quantum efficiency, which affects its large-scale application. Therefore, researchers broaden its visible light response by means of doping and compounding, or turn to other new photocatalytic materials. Rare earth vanadates are a new class of photocatalysts with visible light response, such as LaVO 4 、CeVO 4 、PrVO 4 、NdVO 4 etc. The band gap of this type of vanadate is l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01J35/06
Inventor 马东吴娟辛言君胡春辉
Owner QINGDAO AGRI UNIV
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