A zinc tungstate/stannous tungstate composite photocatalyst with core-shell structure and its preparation and application

A technology of core-shell structure and complex light, which is applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, heterogeneous catalyst chemical elements, etc., and can solve the problems of few organic pollutants research , to achieve the effect of simple preparation method, easy operation and low raw material cost

Active Publication Date: 2020-11-27
QUANZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through a large number of literature and patent research, for ZnWO 4 and SnWO 4 The preparation of composites and their application to photocatalytic degradation of organic pollutants are rarely studied

Method used

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  • A zinc tungstate/stannous tungstate composite photocatalyst with core-shell structure and its preparation and application
  • A zinc tungstate/stannous tungstate composite photocatalyst with core-shell structure and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 One-dimensional ZnWO 4 Preparation of nanorods

[0027] 0.90g Zn(NO 3 ) 2 •6H 2 O and 1.0 g Na 2 WO 4 • 2H 2 O was added to the lining of the 50ml reactor, and 28ml of deionized water was added, and the stirring was continued for 30 minutes, then the pH was adjusted to 7 with 0.5 M NaOH, and the stirring was continued for 1 hour; the stirred solution was transferred to a 50ml autoclave , hydrothermal reaction at 180°C for 48 hours; take it out after the reaction, cool to room temperature in air, centrifuge and dry at 80°C to obtain ZnWO 4white powder, number 1.

Embodiment 2

[0029] 1) One-dimensional ZnWO 4 Preparation of nanorods

[0030] 0.90g Zn(NO 3 ) 2 •6H 2 O and 1.0 g Na 2 WO 4 • 2H 2 O was added to the lining of the 50ml reactor, and 28ml of deionized water was added, and the stirring was continued for 30 minutes, then the pH was adjusted to 7 with 0.5 M NaOH, and the stirring was continued for 1 hour; the stirred solution was transferred to a 50ml autoclave , hydrothermal reaction at 180°C for 48 hours; take it out after the reaction, cool to room temperature in air, centrifuge and dry at 80°C to obtain ZnWO 4 white powder;

[0031] 2) Core-shell structure ZnWO 4 @SnWO 4 Preparation of Composite Photocatalyst

[0032] 0.63g ZnWO 4 and 80ml deionized water were added to a 150ml Erlenmeyer flask, then 0.1 M HCl was added to adjust the pH to 5, and then 0.045g SnCl was added 2 • 2H 2 O and 1 ml of 0.2 M Na 2 WO 4 • 2H 2 O, to regulate SnWO 4 / ZnWO 4 The molar ratio is 1:10, stirred and refluxed at 120°C for 3 hours, then ce...

Embodiment 3

[0034] 1) One-dimensional ZnWO 4 Preparation of nanorods

[0035] 0.90g Zn(NO 3 ) 2 •6H 2 O and 1.0 g Na 2 WO 4 • 2H 2 O was added to the lining of the 50ml reactor, and 28ml of deionized water was added, and the stirring was continued for 30 minutes, then the pH was adjusted to 7 with 0.5 M NaOH, and the stirring was continued for 1 hour; the stirred solution was transferred to a 50ml autoclave , hydrothermal reaction at 160°C for 24 hours; take it out after the reaction, cool to room temperature in the air, centrifuge and dry at 80°C to obtain ZnWO 4 white powder;

[0036] 2) Core-shell structure ZnWO 4 @SnWO 4 Preparation of Composite Photocatalyst

[0037] 0.63g ZnWO 4 and 80ml deionized water were added to a 150ml Erlenmeyer flask, then 0.1 M HCl was added to adjust the pH to 5, and then 0.09g SnCl was added 2 • 2H 2 O and 2 ml of 0.2 M Na 2 WO 4 • 2H 2 O, to regulate SnWO 4 / ZnWO 4 The molar ratio is 2:10, stirred and refluxed at 120°C for 6 hours, then...

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Abstract

The invention discloses a ZnWO4@SnWO4 hybrid photocatalyst with a core-shell structure, as well as preparation and application thereof. The hybrid photocatalyst is prepared by adopting a one-dimensional ZnWO4 nanorod prepared through a hydrothermal method as a core layer, and SnWO4 introduced through an in-situ synthesis method as a shell layer, wherein the molar ratio of the SnWO4 to the ZnWO4 is0.05 to 0.3. The hybrid photocatalyst obtained through the invention has high catalytic activity on rhodamine B under the action of a visible light; when the illumination time remains for 2 hours, the degradation rate of the rhodamine B reaches to 100 percent; the preparation method is simple, easy to operate, cheap in raw materials, and suitable for industrial popularization and application.

Description

technical field [0001] The invention belongs to the field of preparation of photocatalytic materials, in particular to a ZnWO with a core-shell structure 4 @SnWO 4 Composite photocatalyst and its preparation and application. Background technique [0002] Rhodamine B, methyl orange, and methylene blue are a class of refractory toxic organic dyes that are widely used in textile, dye, food, and pharmaceutical industries. These organic dyes are potentially toxic, carcinogenic and mutagenic. After long-term exposure to the human body, they will cause cancer and have high chroma. They are also an important source of eutrophication in water bodies, which will cause serious damage to human health and the ecological environment. Great harm. Therefore, it is imminent to develop an effective organic dye pollutant treatment technology. At present, the treatment technologies for organic dye pollutants include physical adsorption method, biological method, Fenton method, photocatalyti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30C02F1/30C02F101/30
CPCB01J23/002B01J23/30B01J35/004B01J2523/00C02F1/30C02F2101/308C02F2305/10B01J2523/27B01J2523/43B01J2523/69
Inventor 庄华强刘晓彬蔡镇平徐文涛
Owner QUANZHOU NORMAL UNIV
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