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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: 2013-09-04
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
Comparison scheme
Effect test

Embodiment 1

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

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

[0023] Inhale the spinning solution into the syringe (with a capacity of 5-20ml), the advancing 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) faces down and is connected to the positive pole of the high-voltage power supply, and the fiber collection plate (Metal sheet, square with side length of 400mm-600mm) placed horizontall...

Embodiment 2

[0027] (1) Dissolve 3mmol of silver nitrate and 0.75g of polyvinylpyrrolidone in 5ml of absolute ethanol in sequence under stirring to obtain solution A; dissolve 1mmol of vanadium triethoxyoxide in 5ml of absolute ethanol to obtain solution B; Liquid B was added dropwise to liquid A, and the spinning solution was prepared by fully stirring for 6 hours.

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

[0029] (3) The above-mentioned fiber mat is placed in the air to age for 10 hours, and then calcined at 500-600 ° C in an air atmosphere for 5 hours to remove polyvinylpyrrolidone to obtain monoclinic silver vanadate (Ag vanadate). 3 VO 4 ) nanofiber photocatalysts with fiber diameters ranging from 50 nm to 70 nm.

[0030] figure 2 The micrograph of the silver vanadate nanofiber p...

Embodiment 3

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

[0033](2) Electrospin the above spinning solution into filaments through an electrospinning device to obtain a nanofiber mat containing bismuth vanadate and silver vanadate composites and polyvinylpyrrolidone; the specific process is the same as that of Example 1.

[0034] (3) The above-mentioned fiber mat is placed in the air to age for 16 hours, and then calcined for 6 hours at 500-600 ° C in an air atmosphere to remove polyvinylpyrrolidone to obtain monoclinic bismuth vanadate and silver vanadate (Ag vanadate). 1.5 Bi 0.5 VO 4 ) composite nanofiber ph...

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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 kind of vanadate (bismuth vanadate (BiVO 4 ), silver vanadate (Ag 3 VO 4 ) or a complex of both (Ag 3x Bi 1-x VO 4 )) nanofiber photocatalyst and preparation method thereof belong to the technical field of visible light catalytic material preparation. Background technique [0002] Photocatalysis technology is an emerging technology in the field of energy and environment, among which titanium dioxide is the most studied, because of its non-toxic, stable, and low-cost advantages. However, titanium dioxide photocatalytic material only has ultraviolet light response and low quantum efficiency, which affects its large-scale application. Therefore, researchers broaden its visible light response by doping, compounding and other means, or turn to other new photocatalytic materials. [0003] Bismuth vanadate and silver vanadate are a new class of photocatalysts with visible light response. Their monoclinic phase band gap...

Claims

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Application Information

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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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