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Tungsten trioxide/cadmium tungstate nanofiber photocatalytic material and preparation method and application thereof

A photocatalytic material, tungsten trioxide technology, applied in the field of photocatalytic materials, can solve the problems of poor material dispersion and agglomeration, unfavorable photo-generated carrier transport and separation, difficult recycling and reuse of photocatalysts, etc. Electron transport and transfer, the effect of improving photocatalytic efficiency

Active Publication Date: 2019-10-15
济南蓝海洋环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Colloids and Surfaces A:Physicochemical and Engineering Aspects 522(2017):346-354, reported that CdWO prepared by hydrothermal method combined with water bath method 4 / BiOI photocatalyst; Chinese patent document CN105642316A (application number 201510975834.9) discloses a preparation BiOI / CdWO 4 A method of heterojunction photocatalyst, which uses bismuth nitrate, sodium tungstate, potassium iodide and cadmium acetate as raw materials, and prepares BiOI / CdWO through a two-step hydrothermal method 4 Heterojunction photocatalyst, the catalyst is CdWO in the form of nanorods 4 Irregular nanoparticle BiOI loaded on the surface; CdWO prepared by prior art 4 Compared with a single photocatalyst, the / BiOI heterostructure photocatalyst has a certain improvement in its photocatalytic effect; however, the prepared material has poor dispersion and serious agglomeration, and the morphology is not conducive to the transmission and separation of photogenerated carriers, and the prepared Photocatalysts are difficult to recycle and reuse

Method used

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  • Tungsten trioxide/cadmium tungstate nanofiber photocatalytic material and preparation method and application thereof
  • Tungsten trioxide/cadmium tungstate nanofiber photocatalytic material and preparation method and application thereof
  • Tungsten trioxide/cadmium tungstate nanofiber photocatalytic material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A kind of tungsten trioxide / cadmium tungstate (WO 3 / CdWO 4 ) The preparation method of nanofiber photocatalytic material, comprises steps as follows:

[0053] (1) Preparation of spinnable precursor sol: Dissolve 0.3079g (W: 1.25mmol) ammonium metatungstate and 0.2665g (Cd: 1mmol) cadmium acetate in 5mL absolute ethanol and 5mL N,N-dimethyl In the mixed solvent of formamide composition, stir until completely dissolving, add 1g polyvinylpyrrolidone (PVP), stir evenly, obtain the spinnability precursor sol that viscosity is 0.5Pa S;

[0054] (2) WO 3 / 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 20cm, the spraying of the spinnable precursor sol The rate is 1.5mL / h, the voltage is 20kV, and the electrospinning temperature is controlled at 25°C to obtain precursor f...

Embodiment 2

[0059] A kind of tungsten trioxide / cadmium tungstate (WO 3 / CdWO 4 ) The preparation method of nanofiber photocatalytic material, comprises steps as follows:

[0060] (1) Preparation of spinnable precursor sol: Dissolve 0.3695g (W: 1.5mmol) ammonium metatungstate and 0.2665g (Cd: 1mmol) cadmium acetate in 5mL absolute ethanol and 7mL N,N-dimethyl In the mixed solvent of formamide composition, stir until completely dissolving, add 1g polyvinylpyrrolidone (PVP), stir evenly, obtain the spinnability precursor sol that viscosity is 0.5Pa S;

[0061] (2) WO 3 / 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 20kV, and the electrospinning temperature is controlled at 25°C to obtain precursor fi...

Embodiment 3

[0065] A kind of tungsten trioxide / cadmium tungstate (WO 3 / CdWO 4 ) The preparation method of nanofiber photocatalytic material, comprises steps as follows:

[0066] (1) Preparation of spinnable precursor sol: Dissolve 0.4927g (W: 2mmol) ammonium metatungstate and 0.2665g (Cd: 1mmol) cadmium acetate in 5mL absolute ethanol and 9mL N,N-dimethylformaldehyde In the mixed solvent composed of amide, stir until completely dissolved, add 1.2g polyvinylpyrrolidone (PVP), stir evenly, and obtain a spinnable precursor sol with a viscosity of 0.7Pa S;

[0067] (2) WO 3 / 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 electrospinning temperature is controlled at 25°C to obtain precurso...

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Abstract

The invention relates to a tungsten trioxide / cadmium tungstate nanofiber photocatalytic material and a preparation method and applications thereof. The method comprises the following steps: dissolvingammonium metatungstate and cadmium acetate in a mixed solvent consisting of absolute ethyl alcohol and N,N-dimethylformamide, and adding polyvinylpyrrolidone to obtain spinnable precursor sol; controlling rheological property and spinning process parameters of the spinnable precursor sol to prepare precursor fibers, and calcining the precursor fibers at different temperatures to obtain a tungstentrioxide / cadmium tungstate nanofiber photocatalytic material; finally, producing a nanofiber photocatalytic material with a tube-in-tube structure through a preferable experimental scheme. The photocatalytic material realizes efficient photocatalytic degradation of tetracycline under visible light, and the degradation rate can reach 93.1% within 120 min. The preparation method has the advantagesof simple steps, low cost and recyclability, and greatly reduces the application cost.

Description

technical field [0001] The invention relates to a tungsten trioxide / cadmium tungstate nanofiber photocatalytic material and a preparation method and application thereof, belonging to the technical field of photocatalytic materials. Background technique [0002] With the continuous development of industrial production in the current society, pollutants such as sewage and antibiotics produced in the industrial production process have had a serious impact on people's lives and health. Therefore, the governance and purification of the environment has become an urgent problem 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 emerged in solving environmental problems. [0003] Cadmium tungstate (CdWO 4 ) has better chemical, optical, structural properties and excellent thermal stability among all tungstates. And, cad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J35/02B01J35/06C02F1/30C02F101/38
CPCB01J23/30C02F1/30C02F2101/38C02F2305/10B01J35/58B01J35/39B01J35/40
Inventor 卢启芳荣凤郭恩言魏明志
Owner 济南蓝海洋环保科技有限公司
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