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A kind of magnetic composite photocatalytic material and preparation method thereof

A composite photocatalytic and magnetic technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc. Narrow absorption range and other issues, to achieve the effect of wide visible light response range, mild conditions, and easy recycling

Active Publication Date: 2019-03-26
YANAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a photocatalyst, Bi 2 WO 6 There are three problems: first, photogenerated electrons / holes (e- / h+) are easy to recombine, and the separation efficiency is not high; second, the visible light absorption range is relatively narrow; third, Bi 2 WO 6 There is a problem that it is difficult to recycle and reuse photocatalysts
However, since Bi 2 S 3 The bandgap width is very small, resulting in the easy recombination of its photogenerated e- / h+, and the redox ability of e- / h+ is weak. Secondly, Bi 2 S 3 There is also the problem that it is difficult to recycle in use

Method used

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  • A kind of magnetic composite photocatalytic material and preparation method thereof
  • A kind of magnetic composite photocatalytic material and preparation method thereof
  • A kind of magnetic composite photocatalytic material and preparation method thereof

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preparation example Construction

[0064] The present invention also provides the preparation method of above-mentioned composite photocatalytic material: specifically comprise the following steps:

[0065] Step 1: Synthesis of nanomagnetic Fe by hydrothermal method 3 o 4 :

[0066] Step 1.1: Dissolve ferric chloride in ethylene glycol and mechanically stir for 20-40 minutes, continue to add sodium acetate and polyethylene glycol, and continue stirring for 1-3 hours to obtain mixture a, wherein the mass-volume ratio of ferric chloride to ethylene glycol is It is 1.35:40g / mL, the mass ratio of sodium acetate to polyethylene glycol is 3.6:1.0, and the mass ratio of ferric chloride to sodium acetate is 1.35:3.6;

[0067] Step 1.2: Transfer the mixture a to a stainless steel autoclave lined with polytetrafluoroethylene, and put it into an electric heating constant temperature blast drying oven, and react at 170-200°C for 5-10 hours to obtain mixture b ;

[0068] Step 1.3: naturally cool the mixture b to room te...

Embodiment 1

[0085] Step 1: Weigh 1.35g of ferric chloride and dissolve it in 40mL of ethylene glycol, stir with a rotary mechanical stirrer for 30min, then add 3.6g of sodium acetate and 1.0g of polyethylene glycol to it, and then use Stir with a rotary mechanical stirrer for 2 hours, then transfer to a 50mL stainless steel autoclave lined with polytetrafluoroethylene, put it in an electric heating constant temperature blast drying oven, and conduct a hydrothermal reaction at 180°C for 8 hours. After completion, let it cool down to room temperature naturally, then wash the obtained precipitate with water and alcohol successively, and dry it in vacuum at 80°C for 8h to obtain nano-magnetic Fe 3 o 4 ;

[0086] Step 2: Take the nano-magnetic Fe obtained in step 1 3 o 4 0.4g, then add 200mL of 0.1mol / L hydrochloric acid and ultrasonically disperse for 15min, then wash with deionized water until neutral, add 80mL of water and 320mL of ethanol, stir with a rotary mechanical stirrer, dropwise...

Embodiment 2

[0091] Step 1: Weigh 1.35g of ferric chloride and dissolve it in 40mL of ethylene glycol, stir with a rotary mechanical stirrer for 30min, then add 3.6g of sodium acetate and 1.0g of polyethylene glycol to it, and then use Stir with a rotary mechanical stirrer for 2 hours, then transfer to a 50mL stainless steel autoclave lined with polytetrafluoroethylene, put it in an electric heating constant temperature blast drying oven, and conduct a hydrothermal reaction at 180°C for 8 hours. After completion, let it cool down to room temperature naturally, then wash the obtained precipitate with water and alcohol successively, and dry it in vacuum at 80°C for 8h to obtain nano-magnetic Fe 3 o 4 ;

[0092] Step 2: Take the nano-magnetic Fe obtained in step 1 3 o 4 0.4g, then add 0.1mol / L hydrochloric acid 200mL and ultrasonically disperse for 15min, then wash with deionized water until neutral, add 80mL water and 320mL ethanol to it, stir with a rotary mechanical stirrer, slowly drop...

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Abstract

The invention discloses a magnetic composite photocatalytic material, which consists of two layers of SiO 2 PackageFe 3 O 4 Fe forming a “core‑shell” structure 3 O 4 / SiO 2 / mSiO 2 , the composite photocatalytic material also includes Bi 2 WO 6 and Bi 2 S 3 ; The invention also discloses a method for preparing this magnetic composite photocatalytic material. The composite photocatalytic material prepared by this method not only has a wide spectral response range and high visible light catalytic activity, but is also easy to recycle, and its reusability is also very stable.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation methods, and in particular relates to a magnetic composite photocatalytic material, and also relates to a preparation method of the material. Background technique [0002] Bi 2 WO 6 It is the simplest Aurivillius type oxide, its Bi6s orbital and O2p orbital are hybridized to form the valence band (VB), and the W5d orbital forms the conduction band (CB), and its forbidden band width is narrow (about 2.7eV). is excited by absorbing part of the visible light, therefore, Bi 2 WO 6 The research and development of photocatalytic materials provides new ideas for improving the utilization rate of sunlight, and has potential application value in the fields of environmental purification and new energy development, and has become one of the widely researched photocatalysts. However, as a photocatalyst, Bi 2 WO 6 There are three problems: first, photogenerated electrons / holes (e- / ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/049B01J35/02C02F1/30C02F101/30B01J35/00
CPCC02F1/30B01J27/049C02F2101/308B01J35/396B01J35/39B01J35/33B01J35/50
Inventor 郭莉王丹军王婵赵强付峰
Owner YANAN UNIV
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