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Silver-modified cobalt tungstate/cadmium tungstate nanofiber photocatalytic material as well as preparation method and application thereof

A photocatalytic material and nanofiber technology, applied in the field of photocatalytic materials, can solve the problems of difficult recycling and reuse, high application cost, unfavorable photo-generated carrier transport and separation, etc., to prevent cluster aggregation, uniform distribution, and stability. The effect of silver nanoparticles

Active Publication Date: 2020-06-16
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Silver-modified cobalt tungstate/cadmium tungstate nanofiber photocatalytic material as well as preparation method and application thereof
  • Silver-modified cobalt tungstate/cadmium tungstate nanofiber photocatalytic material as well as preparation method and application thereof
  • Silver-modified cobalt tungstate/cadmium tungstate nanofiber photocatalytic material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0067] (1) Preparation of spinnable precursor sol: Dissolve 0.7391g (W: 3mmol) ammonium metatungstate, 0.2665g (Cd: 1mmol) cadmium acetate and 0.9046g (Co: 2mmol) cobalt nitrate in 3mL methanol and 7mL In the mixed solvent of N,N-dimethylformamide composition, stir until completely dissolving, add 0.8g polyvinylpyrrolidone (PVP), stir well, obtain the spinnability precursor sol that viscosity is 0.5Pa S;

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

Embodiment 2

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

[0075] (1) Preparation of spinnable precursor sol: Dissolve 0.7391g (W: 3mmol) ammonium metatungstate, 0.2665g (Cd: 1mmol) cadmium acetate and 0.9046g (Co: 2mmol) cobalt nitrate in 3mL methanol and 7mL In the mixed solvent of N,N-dimethylformamide composition, stir until completely dissolving, add 0.8g polyvinylpyrrolidone (PVP), stir well, obtain the spinnability precursor sol that viscosity is 0.5Pa S;

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

Embodiment 3

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

[0082] (1) Preparation of spinnable precursor sol: Dissolve 0.6159g (W: 2.5mmol) ammonium metatungstate, 0.2665g (Cd: 1mmol) cadmium acetate and 0.6784 (Co: 1.5mmol) cobalt nitrate in 3mL anhydrous In a mixed solvent composed of ethanol and 7mL N,N-dimethylformamide, stir until completely dissolved, add 1.2g 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: spray the spinnable precursor sol into the receiving plate with a plastic syringe with a stainless steel needle, the receiving distance between the stainless steel needle of the syringe and the receiving plate is 25cm, the spraying of the spinnable precursor sol The rate is 1.5mL / h, the voltage is 25kV, and the elect...

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Abstract

The invention relates to a silver-modified cobalt tungstate / cadmium tungstate nanofiber photocatalytic material as well as a preparation method and application thereof. Ammonium metatungstate, cadmiumacetate, cobalt nitrate and polyvinylpyrrolidone are used as reaction raw materials to prepare spinnable precursor sol, and cobalt tungstate / cadmium tungstate nanofibers are prepared through electrostatic spinning and calcination; silver particles are deposited on the cobalt tungstate / cadmium tungstate nanofibers through a silver mirror reaction by adopting silver nitrate as a reaction raw material, and therefore the silver-modified cobalt tungstate / cadmium tungstate composite nanofiber photocatalytic material is formed. According to the silver-modified cobalt tungstate / cadmium tungstate composite nanofiber photocatalytic material prepared by the invention, efficient photocatalytic degradation of ciprofloxacin under visible light is realized, the degradation rate can reach 93.5% within 90min, the preparation method is simple in steps, low in cost and recyclable, and the application cost is greatly reduced.

Description

technical field [0001] The invention relates to a silver-modified cobalt tungstate / cadmium tungstate nanofiber photocatalytic material and a preparation method and application thereof, belonging 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 lot of energy and environmental problems. Among them, the problem of water pollution related to human survival has become one of the most urgent problems to be solved. In the current environmental problem remediation, 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 for humans to solve water pollution problems. [0003] Since 1972, Fujishi...

Claims

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Application Information

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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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