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Vanadate nanofiber photocatalyst and preparation method thereof

A nanofiber, photocatalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as difficult to use electrospinning, achieve good visible light catalytic degradation ability, rapid separation, The effect of narrow bandgap width

Inactive Publication Date: 2015-03-11
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies in the prior art above, the present invention proposes a vanadate nanofiber photocatalyst, and at the same time provides an electrospinning preparation method of the vanadate nanofiber photocatalyst, using a precursor with better alcohol solubility to prepare electrostatic Spinning solution can solve the problem that the precursor is insoluble in organic solvents and it is difficult to prepare vanadate nanofiber photocatalysts by electrospinning technology

Method used

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  • Vanadate nanofiber photocatalyst and preparation method thereof
  • Vanadate nanofiber photocatalyst and preparation method thereof
  • Vanadate nanofiber photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) Dissolve 1mmol of bismuth 2-ethylhexanoate and 0.5g of polyvinylpyrrolidone in 5ml of absolute ethanol in turn under stirring to obtain liquid A; dissolve 1mmol of vanadyl acetylacetonate in 5ml of absolute ethanol to obtain B solution; add solution B dropwise to solution A, and stir thoroughly for 4 hours to make spinning solution.

[0022] (2) Electrospin the above spinning liquid into filaments through an electrospinning device to obtain a composite nanofiber felt of bismuth vanadate and polyvinylpyrrolidone; the specific process is:

[0023] Draw the spinning solution into the syringe (capacity 5-20ml is acceptable), the propulsion speed of the syringe is controlled by a micro constant flow pump, the needle of the syringe (metal material, inner diameter 0.6mm-1.2mm) is facing downward and connected to the positive electrode of the high voltage power supply, and the fiber collecting plate (Metal thin plate, square with side length 400mm-600mm) placed horizontally...

Embodiment 2

[0027] (1) Dissolve 3mmol of silver nitrate and 0.75g of polyvinylpyrrolidone in 5ml of absolute ethanol sequentially under stirring to obtain liquid A; dissolve 1mmol of triethoxyvanadium oxide in 5ml of absolute ethanol to obtain liquid B; Add liquid B dropwise to liquid A, and stir thoroughly for 6 hours to make spinning solution.

[0028] (2) The above-mentioned spinning solution was electrospun into filaments through an electrospinning device to obtain a composite nanofiber mat containing silver vanadate and polyvinylpyrrolidone; the specific process was the same as in Example 1.

[0029] (3) Aging the above fiber felt in the air for 10 hours, and then roasting at 500-600°C for 5 hours in an air atmosphere to remove polyvinylpyrrolidone to obtain monoclinic silver vanadate (Ag 3 VO 4 ) nanofiber photocatalyst, the fiber diameter of which is 50nm-70nm.

[0030] figure 2 A micrograph of the silver vanadate nanofiber photocatalyst prepared in this example is given. Put ...

Embodiment 3

[0032] (1) Dissolve 0.5mmol of ammonium bismuth citrate, 1.5mmol of silver nitrate and 1g of polyvinylpyrrolidone in 5ml of absolute ethanol in turn under stirring to obtain liquid A; dissolve 1mmol of organovanadium salt vanadyl triisopropoxide in 5ml In absolute ethanol, liquid B was obtained; liquid B was added dropwise to liquid A, and fully stirred for 8 hours to prepare a spinning solution.

[0033](2) The above-mentioned spinning solution was electrospun into filaments through an electrospinning device to obtain a nanofiber mat containing a bismuth vanadate-silver vanadate composite and polyvinylpyrrolidone; the specific process was the same as in Example 1.

[0034] (3) Aging the above fiber felt in the air for 16 hours, and then roasting at 500-600°C for 6 hours in an air atmosphere to remove polyvinylpyrrolidone, and obtain monoclinic bismuth vanadate and silver vanadate (Ag 1.5 Bi 0.5 VO 4 ) composite nanofiber photocatalyst, the fiber diameter of which is 30nm-50...

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Abstract

The invention relates to a vanadate nanofiber photocatalyst and a preparation method thereof. The nanofiber photocatalyst is pucherite, or silver vanadate, or a compound of pucherite and silver vanadate. Organic vanadic salt, organic bismuth salt and the like with good alcohol solubility are taken as precursor reactors, a spinning solution is prepared by a PVP (Polyvinyl Pyrrolidone) and alcohol system, electrospining is performed by an electrospining device, then high-temperature roasting is performed, and the vanadate nanofiber photocatalyst is obtained. A prepared vanadate nanofiber is in a monoclinic crystal phase, is 30-100nm in diameter, has a narrower band gap, shows good visible light catalytic degradation ability for ofloxacin, a contaminant in water, and can be separated from a solution quickly by precipitation.

Description

technical field [0001] The present invention relates to a vanadate (bismuth vanadate (BiVO 4 ), silver vanadate (Ag 3 VO 4 ) or a composite of both (Ag 3x Bi 1-x VO 4 )) A nanofiber photocatalyst and a preparation method thereof belong 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. [0003] Bismuth vanadate and silver vanadate are a new type of photocatalysts with visible light response. Their monoclinic p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01J23/68B01J35/06B01J37/34C02F1/30
Inventor 马东吴娟柴超辛言君
Owner QINGDAO AGRI UNIV
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