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Fe3O4/ BiOI/AgBr magnetic composite visible-light-driven photocatalyst and preparation thereof

A technology of triiron tetroxide and bismuth iodide oxide, which is applied in the field of photocatalytic technology materials, can solve the problems of large band gap and lower solar energy utilization rate, and achieve the effects of easy recovery, easy recycling, and mild reaction conditions

Inactive Publication Date: 2017-03-22
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, titanium dioxide has a large band gap and can only be excited by ultraviolet light, and ultraviolet light in sunlight only accounts for a small part, which greatly reduces the utilization rate of solar energy.

Method used

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  • Fe3O4/ BiOI/AgBr magnetic composite visible-light-driven photocatalyst and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1. (1) prepare magnetic ferric oxide:

[0017] Dissolve 0.6250g ferric chloride hexahydrate, 3.0g sodium acetate in a mixed solution of 30mL ethylene glycol and 10mL oleic acid, heat in a water bath, stir at a constant temperature for 20min until the solid is completely dissolved, transfer to a hydrothermal kettle at 200°C and react for 20h to obtain magnetic tetra Ferric oxide.

[0018] (2) Synthesis of ferric oxide / bismuth oxyiodide magnetic composite visible light catalyst

[0019] Dissolve 0.0364g of ferric oxide and 0.4851g of bismuth nitrate pentahydrate in 10ml of ethylene glycol to form solution A, dissolve 0.1660g of potassium iodide in 15ml of water to form solution B, slowly drop solution B into solution A, Adjust the pH to 11, stir for 30 minutes, transfer to a hydrothermal kettle, and react at a reaction temperature of 140° C. for 24 hours to obtain ferric oxide / bismuth oxyiodide magnetic composite visible light catalyst. The mass fraction of f...

Embodiment 2

[0023] Embodiment 2. (1) prepare magnetic ferric oxide:

[0024] Dissolve 0.6250g ferric chloride hexahydrate, 3.0g sodium acetate in a mixed solution of 30mL ethylene glycol and 10mL oleic acid, heat in a water bath, stir at a constant temperature for 20min until the solid is completely dissolved, transfer to a hydrothermal kettle at 200°C and react for 20h to obtain magnetic tetra Ferric oxide.

[0025] (2) Synthesis of ferric oxide / bismuth oxyiodide magnetic composite visible light catalyst

[0026] Dissolve 0.0146g of ferric oxide and 0.4851g of bismuth nitrate pentahydrate in 10ml of ethylene glycol to form solution A, dissolve 0.1660g of potassium iodide in 15ml of water to form solution B, slowly drop solution B into solution A, Adjust the pH to 11, stir for 30 minutes, transfer to a hydrothermal kettle, and react at a reaction temperature of 140° C. for 24 hours to obtain a composite photocatalyst of ferric oxide and bismuth oxyiodide. The mass fraction of ferric oxi...

Embodiment 3

[0030] Embodiment 3.(1) prepare the good ferric oxide of magnetic field:

[0031] Dissolve 0.6250g ferric chloride hexahydrate, 3.0g sodium acetate in a mixed solution of 30mL ethylene glycol and 10mL oleic acid, heat in a water bath, stir at a constant temperature for 20min until the solid is completely dissolved, transfer to a hydrothermal kettle at 200°C and react for 20h to obtain magnetic tetra Ferric oxide.

[0032] (2) Synthesis of ferric oxide / bismuth oxyiodide magnetic composite visible light catalyst

[0033] Dissolve 0.0405g of ferric oxide and 0.7673g of bismuth nitrate pentahydrate in 20ml of ethylene glycol to form solution A, dissolve 0.2490g of potassium iodide in 30ml of water to form solution B, slowly drop solution B into solution A, Adjust the pH to 11, stir for 30 minutes, transfer to a hydrothermal kettle, and react at a reaction temperature of 140° C. for 24 hours to obtain a composite photocatalyst of ferric oxide and bismuth oxyiodide. The mass fract...

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Abstract

The invention discloses a Fe3O4 / BiOI / AgBr magnetic composite visible-light-driven photocatalyst and a preparation method thereof, The Fe3O4 / BiOI / AgBr magnetic composite visible-light-driven photocatalyst is synthesized from Fe3O4, BiOI and AgBr by a hydrothermal method. First, the magnetic Fe3O4 and the visible-light-driven photocatalyst BiOI are compounded, so that the catalyst can be magnetically recovered, and self-recyclable utilization property can be improved; and secondly, and the AgBr are compounded for forming a heterogeneous structure to promote efficient separation of photogenerated electron-hole pairs so as to improve the photocatalytic activity. The main preparation steps are as follows: (1) preparation of the magnetic Fe3O4 by the hydrothermal method; (2) preparation of a Fe3O4 / BiOI magnetic composite photocatalyst by the hydrothermal method; and (3) preparation of the Fe3O4 / BiOI / AgBr magnetic composite visible-light-driven photocatalyst by the hydrothermal method. The method has the excellent advantages of being simple, practical, green, environmentally-friendly and the like, and the prepared catalyst has the advantages of high catalytic activity, magnetic recovery, and good application prospects.

Description

technical field [0001] The invention relates to a ferric oxide / bismuth oxyiodide / silver bromide magnetic composite visible light catalyst and its preparation. The semiconductor visible light catalyst is used to catalyze and degrade organic matter in water, and belongs to the field of photocatalytic technology materials. Background technique [0002] Energy crisis and global pollution are huge challenges in the future development of human beings. Photocatalytic technology has been extensively studied in terms of environmental protection and energy utilization due to its advantage of directly using sunlight to solve water pollution. Photocatalytic technology is an emerging environmental protection technology born in the 1970s. As a traditional photocatalyst, titanium dioxide has become the most popular photocatalyst in the world due to its strong oxidation ability, stable chemical properties, and non-toxicity. photocatalytic material. However, titanium dioxide has a large ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/128
CPCB01J27/128B01J35/33B01J35/39
Inventor 燕启社崔逸萌赵雅蕾董小霞张强申贵宾陈耀钟正全
Owner ZHENGZHOU UNIV