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Carbon nano tube and vanadate composite nanofiber photocatalyst and preparation method thereof

A technology of composite nanofibers and carbon nanotubes, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, etc., can solve the problem of carbon nanotubes and vanadate Composite photocatalytic fiber and other issues to achieve good visible light catalytic degradation ability and rapid separation effect

Inactive Publication Date: 2015-03-18
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 transition metal vanadate precursors and organic solvent systems, no report has been found on the preparation of carbon nanotubes and vanadate composite photocatalytic fibers by electrospinning.

Method used

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  • Carbon nano tube and vanadate composite nanofiber photocatalyst and preparation method thereof
  • Carbon nano tube and vanadate composite nanofiber photocatalyst and preparation method thereof
  • Carbon nano tube and vanadate composite nanofiber photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Add 1mmol indium nitrate (In(NO 3 ) 3 ) and 0.5g of polyvinylpyrrolidone were dissolved in 5ml of absolute ethanol, and then 20mg of carbon nanotube powder was immersed in it, stirred thoroughly 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.

[0021] (2) The above spinning solution is electrospun into filaments through an electrospinning device to obtain a composite nanofiber felt; the specific steps are:

[0022] 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...

Embodiment 2

[0026] (1) 1mmol ferric nitrate (Fe(NO 3 ) 3 ) and 0.75g of polyvinylpyrrolidone were dissolved in 5ml of absolute ethanol, and then 30mg of carbon nanotube 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;

[0027] (2) The above-mentioned spinning solution was electrospun into filaments through an electrospinning device, and a composite nanofiber mat containing carbon nanotubes, iron vanadate and polyvinylpyrrolidone was obtained according to the specific process described in step (2) of Example 1.

[0028] (3) Aging the fiber mat obtained in step (2) in the air for 16 hours, and then roasting it in an air atmosphere at 500-600°C for 2 hours to remove polyvinylpyrrolidone to obtain carbon nanotubes and iron vanadate (FeVO 4 ) c...

Embodiment 3

[0031] (1) Add 1mmol of yttrium nitrate (Y(NO 3 ) 3 ) and 1g of polyvinylpyrrolidone were dissolved in 5ml of absolute ethanol, and then 10mg of carbon nanotube 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 solution B to solution A drop by drop, stir thoroughly for 8 hours to make spinning solution.

[0032](2) Electrospin the above spinning solution into filaments through an electrospinning device, and obtain a composite nanofiber mat containing carbon nanotubes, yttrium vanadate and polyvinylpyrrolidone according to the specific process described in step (2) of Example 1.

[0033] (3) Aging the fiber mat obtained in step (2) in the air for 24 hours, and then roasting at 500-600°C for 4 hours in an air atmosphere to remove polyvinylpyrrolidone to obtain carbon nanotubes and yttrium vanadate (YVO 4 ) composite nanofibe...

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Abstract

The invention relates to a carbon nano tube and vanadate composite nanofiber photocatalyst and a preparation method thereof. The composite nanofiber photocatalyst is formed by compositing a carbon nano tube and vanadate at a ratio of (10-30mg):1mmol. Organic vanadic salt with good alcohol solubility and transition metal nitrate serve as precursor reactants; a spinning solution is prepared by virtue of PVP (polyvinyl pyrrolidone) and an ethanol system; carbon nano tube powder is uniformly dispersed in the spinning solution; a yarn is formed by an electrostatic spinning device; and the carbon nano tube and vanadate composite nanofiber photocatalyst is obtained after high-temperature roasting. The surface of a prepared composite nanofiber is in a rich hole layer structure, and is narrower in band gap width; and the carbon nano tube and vanadate composite nanofiber photocatalyst has very good visible photocatalytic degradation ability to a water pollutant, namely ofloxacin, and can achieve quick separation through a precipitate and the solution.

Description

technical field [0001] The invention relates to a carbon nanotube and vanadate (MVO 4 (M=In, Fe or Y)) composite nanofiber photocatalyst and a 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. Transition metal vanadates are a new class of photocatalysts with visible light response, such as InVO 4 、FeVO 4 、YVO 4 etc. The band gap of this type of vanadate is lower than that o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01J23/847B01J35/06
Inventor 马东吴娟辛言君刁志凯
Owner QINGDAO AGRI UNIV
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