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A silver-modified cobalt tungstate/cadmium tungstate nanofiber photocatalytic material and its preparation method and application

A technology of photocatalytic materials and nanofibers, applied in the field of photocatalytic materials, can solve the problems of unfavorable photogenerated carrier transmission and separation, high application cost, difficult recycling and reuse, etc., to avoid thermodynamic instability, uniform distribution, The effect of preventing cluster aggregation

Active Publication Date: 2022-06-17
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the composite material prepared by the above method is not a one-dimensional nanomaterial, which is not conducive to the transmission and separation of photogenerated carriers, and is difficult to recycle and reuse, and the application cost is high

Method used

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  • A silver-modified cobalt tungstate/cadmium tungstate nanofiber photocatalytic material and its preparation method and application
  • A silver-modified cobalt tungstate/cadmium tungstate nanofiber photocatalytic material and its preparation method and application
  • A silver-modified cobalt tungstate/cadmium tungstate nanofiber photocatalytic material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0066] A silver-modified cadmium tungstate / cobalt tungstate (Ag / CoWO) 4 / CdWO 4 ) The preparation method of composite nanofiber photocatalytic material, including steps are as follows:

[0067] (1) Preparation of spinnable precursor sol: 0.7391 g (W: 3 mmol) ammonium metatungstate, 0.2665 g (Cd: 1 mmol) cadmium acetate and 0.9046 g (Co: 2 mmol) cobalt nitrate were dissolved in 3 mL methanol and 7 mL In a mixed solvent composed of N,N-dimethylformamide, stir until completely dissolved, add 0.8g of polyvinylpyrrolidone (PVP), stir evenly, and obtain a spinnable precursor sol with a viscosity of 0.5Pa·S;

[0068] (2) CoWO 4 / CdWO 4 Preparation of precursor fibers: The spinnable precursor sol was sprayed into the receiver plate with a plastic syringe with a stainless steel needle, and the receiving distance between the stainless steel needle of the syringe and the receiver plate was 15 cm, and the spinnable precursor sol was sprayed The rate was 1.5 mL / h, the voltage was 20 kV, ...

Embodiment 2

[0074] A silver-modified cadmium tungstate / cobalt tungstate (Ag / CoWO) 4 / CdWO 4 ) The preparation method of composite nanofiber photocatalytic material, including steps are as follows:

[0075] (1) Preparation of spinnable precursor sol: 0.7391 g (W: 3 mmol) ammonium metatungstate, 0.2665 g (Cd: 1 mmol) cadmium acetate and 0.9046 g (Co: 2 mmol) cobalt nitrate were dissolved in 3 mL methanol and 7 mL In a mixed solvent composed of N,N-dimethylformamide, stir until completely dissolved, add 0.8g of polyvinylpyrrolidone (PVP), stir evenly, and obtain a spinnable precursor sol with a viscosity of 0.5Pa·S;

[0076] (2) CoWO 4 / CdWO 4 Preparation of precursor fibers: The spinnable precursor sol was sprayed into the receiver plate with a plastic syringe with a stainless steel needle, and the receiving distance between the stainless steel needle of the syringe and the receiver plate was 25 cm, and the spinnable precursor sol was sprayed The rate was 1.5 mL / h, the voltage was 30 kV...

Embodiment 3

[0081] A silver-modified cadmium tungstate / cobalt tungstate (Ag / CoWO) 4 / CdWO 4 ) The preparation method of composite nanofiber photocatalytic material, including steps are as follows:

[0082] (1) Preparation of spinnable precursor sol: 0.6159 g (W: 2.5 mmol) ammonium metatungstate, 0.2665 g (Cd: 1 mmol) cadmium acetate and 0.6784 (Co: 1.5 mmol) cobalt nitrate were dissolved in 3 mL of anhydrous In a mixed solvent composed of ethanol and 7mL of N,N-dimethylformamide, stir until completely dissolved, add 1.2g of polyvinylpyrrolidone (PVP), stir evenly, and obtain a spinnable precursor sol with a viscosity of 0.7Pa·S ;

[0083] (2) CoWO 4 / CdWO 4 Preparation of precursor fibers: The spinnable precursor sol was sprayed into the receiver plate with a plastic syringe with a stainless steel needle, and the receiving distance between the stainless steel needle of the syringe and the receiver plate was 25 cm, and the spinnable precursor sol was sprayed The rate was 1.5 mL / h, the...

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Abstract

The invention relates to a silver-modified cobalt tungstate / cadmium tungstate nanofiber photocatalytic material and a preparation method and application thereof. In the present invention, ammonium metatungstate, cadmium acetate, cobalt nitrate and polyvinylpyrrolidone are used as reaction raw materials to prepare spinnable precursor sol, and cobalt tungstate / cadmium tungstate nanofibers are obtained through electrospinning and calcination; silver nitrate is used as the The reaction raw materials deposit silver particles on the cobalt tungstate / cadmium tungstate nanofibers through a silver mirror reaction, thereby forming a silver-modified cobalt tungstate / cadmium tungstate composite nanofiber photocatalytic material. The silver-modified cobalt tungstate / cadmium tungstate composite nanofiber photocatalytic material prepared by the invention realizes efficient photocatalytic degradation of ciprofloxacin under visible light, and the degradation rate can reach 93.5% within 90 minutes. The preparation method has simple steps, low cost, and It can be recycled, which greatly reduces the application cost.

Description

technical field [0001] The invention relates to a silver-modified cobalt tungstate / cadmium tungstate nanofiber photocatalytic material, a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. Background technique [0002] Since the beginning of the 21st century, various human activities have become more and more frequent. In addition to the vigorous development of the economy and the improvement of human living standards, there are also a large number of energy and environmental problems. Among them, the water pollution problem related to human survival has become one of the most urgent problems to be solved. In the current remediation of environmental problems, semiconductor photocatalysis technology has the unique performance of directly using solar energy as a light source to drive redox reactions, and has gradually become one of the most promising ways to solve water pollution problems. [0003] Since 1972, Kenichi F...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J35/00B01J35/06C02F1/30C02F101/38C02F101/34
CPCB01J23/8993C02F1/30C02F2305/10C02F2101/34C02F2101/38B01J35/393B01J35/58B01J35/39
Inventor 卢启芳荣凤黄桂香郭恩言魏明志
Owner QILU UNIV OF TECH
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