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Phosphate nanofiber photocatalyst and preparation method thereof

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

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 phosphate nanofiber photocatalyst, and at the same time provides an electrospinning preparation method of the phosphate nanofiber photocatalyst, using a precursor with better alcohol solubility to prepare electrospinning solution, which can solve the problem that the precursor is insoluble in organic solvents and it is difficult to prepare phosphate nanofiber photocatalysts by electrospinning technology

Method used

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  • Phosphate nanofiber photocatalyst and preparation method thereof
  • Phosphate nanofiber photocatalyst and preparation method thereof
  • Phosphate nanofiber photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
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 phosphoric acid crystals in 5ml of absolute ethanol to obtain liquid B; Add liquid B to liquid A drop by drop, stir thoroughly for 4 hours to make spinning solution.

[0022] (2) The above spinning solution is electrospun into filaments through an electrospinning device to obtain nanofiber mats containing bismuth phosphate 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, d...

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 phosphoric acid crystals in 5ml of absolute ethanol to obtain liquid B; dissolve liquid B dropwise Add it into liquid A 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 to obtain a composite nanofiber mat containing silver phosphate 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 in an air atmosphere at 500-600°C for 5 hours to remove polyvinylpyrrolidone to obtain silver phosphate (Ag 3 PO 4 ) nanofiber photocatalyst, the fiber diameter of which is 40nm-60nm.

[0030] figure 2 A micrograph of the silver phosphate nanofiber photocatalyst prepared in this example is give...

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 phosphoric acid crystals in 5ml of absolute ethanol to obtain B Liquid; Add liquid B dropwise to liquid A, and stir thoroughly for 8 hours to make a spinning solution.

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

[0034](3) Aging the above fiber felt in the air for 16 hours, and then roasting in an air atmosphere at 500-600°C for 6 hours to remove polyvinylpyrrolidone to obtain bismuth phosphate and silver phosphate (Ag 1.5 Bi 0.5 PO 4 ) composite nanofiber photocatalyst, the fiber diameter of which is 60nm-90nm.

[0035] image 3 A micrograp...

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Abstract

The invention relates to a phosphate nanofiber photocatalyst and a preparation method thereof. The nanofiber photocatalyst is bismuth phosphate, or silver phosphate, or a compound of bismuth phosphate and silver phosphate. Phosphoric acid crystals, 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 phosphate nanofiber photocatalyst is obtained. A prepared phosphate nanofiber is 25-90nm 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 phosphate (bismuth phosphate (BiPO 4 ), silver phosphate (Ag 3 PO 4 ) and their complex (Ag 3x Bi 1-x PO 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 phosphate and silver phosphate are a new class of photocatalysts with high pollutant degradation effici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/186B01J27/18B01J35/06B01J37/34C02F1/30
Inventor 马东吴娟周震峰史衍玺
Owner QINGDAO AGRI UNIV
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