Visible-light responding type magnetic compound photocatalyst with core-shell structure and preparation method and application thereof

A core-shell structure, photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of difficult separation of photocatalysts, easy photocorrosion, etc. The effect of improving photocorrosion resistance, excellent photocatalytic efficiency and photocatalytic stability

Active Publication Date: 2015-03-25
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome Ag 3 PO 4 Photocatalysts are difficult to separate, easy to photocorrosion and other problems, and further enhance Ag 3 PO 4 Visible light absorption ability and photocatalytic activity, thus providing a carbon microsphere zinc ferrite silver phosphate (CMSsZnFe 2 o 4 Ag 3 PO 4 ) Visible light-responsive core-shell magnetic composite photocatalyst

Method used

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  • Visible-light responding type magnetic compound photocatalyst with core-shell structure and preparation method and application thereof
  • Visible-light responding type magnetic compound photocatalyst with core-shell structure and preparation method and application thereof
  • Visible-light responding type magnetic compound photocatalyst with core-shell structure and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0055] (1) Preparation of composite photocatalyst: first, ZnFe with uniform morphology and stable structure was prepared by solvothermal synthesis 2 o 4 , that is, 4mmol Fe(NO 3 ) 3 9H 2 O and 2mmol Zn(NO 3 ) 2 ·6H 2 O was dissolved in 60mL of ethylene glycol solvent, and mixed evenly under mechanical stirring, then 30mmol of crystalline sodium acetate was added, and the stirring was continued for 1h. After the reactor was naturally cooled to room temperature, the precipitate was repeatedly ultrasonically washed with absolute ethanol and ultrapure water, separated with a magnet, dried in a vacuum oven at 60°C for 12 hours, ground, and passed through an 80-mesh sieve. ZnFe 2 o 4 ;

[0056] Further preparation of CMSsZnFe by hydrothermal synthesis 2 o 4 , namely accurately weigh the ZnFe prepared in 2mmol step (1) 2 o 4 Disperse in 160mL solution with 10mmol of glucose dissolved, transfer it to a 200mL polytetrafluoroethylene-lined autoclave after uniform dispersion...

Embodiment 2

[0060] Same as embodiment 1, just add Zn(NO 3 ) 2 ·6H 2 The amount of O was 1.5 mmol. It can be seen from the test results that the removal efficiency of the composite material for 2,4-DCP reaches 96.84% after 150 minutes of light irradiation.

Embodiment 3

[0062] (1) Preparation of composite photocatalyst: ZnFe 2 o 4 and CMSsZnFe 2 o 4 The preparation process is the same as in Example 1. Then, CMSsZnFe was prepared by in situ precipitation method 2 o 4 Ag 3 PO 4 , the CMSsZnFe prepared in the 0.21g step (2) 2 o 4 Disperse in 100mL ethanol solution (V 乙醇 :V 水 =4:1) and sonicate for 10min, then add 50mL dissolved with 1.5mmol AgNO 3 Aqueous solution and mechanically stirred for 12h to make as much Ag as possible + bound in CMSsZnFe 2 o 4 Surface, then dissolve 50mL with 0.6mmol Na at a rate of 6mL / min 2 HPO 4 12H 2 The aqueous solution of O was added dropwise to the above-mentioned dispersion liquid and reacted for 1 h. After the precipitate obtained from the reaction was repeatedly washed with ultrapure water, it was magnetically separated, dried, ground, and passed through a 80-mesh sieve to obtain CMSs, ZnFe 2 o 4 and Ag 3 PO 4 The core-shell structure composite photocatalyst CMSsZnFe with a mass ratio of 1....

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Abstract

The invention provides visible-light responding type magnetic compound photocatalyst carbon microspheres-zinc ferrite and silver phosphate (CMSs-ZnFe2O4 and Ag3PO4) with core-shell structures and a preparation method and application of the visible-light responding type magnetic compound photocatalyst carbon microspheres. The CMSs are used as cores, zinc ferrite and silver phosphate are sequentially loaded on the surface of the CMS by a solvothermal method and an in-situ precipitation method, therefore, the compound photocatalyst carbon microspheres-zinc ferrite and silver phosphate with the double core-shell structures is prepared. Compared with pure Ag3PO4, the prepared compound photocatalyst has the advantages of high visible light absorption strength, good magnetic separation property, strong photo corrosion resistance and the like, is applied to treatment of 2,4-dichlorophen non-biodegradable organic wastewater, has high removal rate of 96.56% for 20mg / L of 2,4-dichlorophen solution within 150min, and still has the removal rate up to 86.21% for the 2,4-dichlorophen solution after used repeatedly for four times.

Description

technical field [0001] The invention relates to a visible light-responsive core-shell magnetic composite photocatalyst and its preparation method and application, in particular to the preparation method and application of carbon microsphere zinc ferrite silver phosphate, belonging to the technical field of chemical engineering and environmental protection engineering. Background technique [0002] The treatment of organic pollutants by photocatalytic oxidation technology has the advantages of mild reaction conditions, fast reaction speed, high mineralization rate, and less secondary pollution. TiO 2 Semiconductor photocatalytic materials are photocatalysts widely studied at home and abroad, but their band gap is wide (3.2eV), and they can only produce photocatalytic activity under the irradiation of ultraviolet light (accounting for only 4% of the total solar radiation), which greatly limit its application. Therefore, the development of visible light-responsive photocataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185C02F1/28C02F1/30C02F101/36
CPCY02W10/37
Inventor 戴友芝陈晓娟刘潭华郭靖刘锦军
Owner XIANGTAN UNIV
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