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Method for preparing Fe3O4/SiO2/N-TiO2 magnetic visible-light-induced photocatalyst with nitric acid being nitrogen source

A visible light and catalyst technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of low catalytic activity of visible light, and achieve the effect of strong magnetism and easy magnetic separation and recovery

Inactive Publication Date: 2016-11-09
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Fe prepared by existing methods 3 o 4 / SiO 2 / N-TiO 2 The visible light catalytic activity of magnetic visible light catalysts is generally low

Method used

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  • Method for preparing Fe3O4/SiO2/N-TiO2 magnetic visible-light-induced photocatalyst with nitric acid being nitrogen source
  • Method for preparing Fe3O4/SiO2/N-TiO2 magnetic visible-light-induced photocatalyst with nitric acid being nitrogen source
  • Method for preparing Fe3O4/SiO2/N-TiO2 magnetic visible-light-induced photocatalyst with nitric acid being nitrogen source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Weigh 900mg of Fe 3 o 4 Add 720mL of ethanol and 180mL of water to the mixed solution, add 9mL of ammonia water, after 30 minutes of ultrasonication, slowly add 3mL of tetraethyl orthosilicate dropwise under the strong stirring of a dynamic stirrer, stir at room temperature for 6 hours and then under the action of an external magnetic field The sample was magnetically separated, and the separated solid phase was centrifuged and washed with distilled water and ethanol, and dried in a vacuum oven at 80°C for 6 hours to obtain Fe with a core-shell structure. 3 o 4 / SiO 2 Binary nanocomposites;

[0026] 2. Weigh 37mL of absolute ethanol and add it to the PTFE lining, add 50mg of Fe 3 o 4 / SiO 2 Nanocomposite, sonicate for 10 minutes, slowly add 2 mL of n-tetrabutyl titanate dropwise, then add 1 mL of concentrated nitric acid and stir for 20 minutes. Put the polytetrafluoroethylene liner into a stainless steel high-pressure reaction kettle, seal it, place it in an ...

Embodiment 2

[0030] 1. Weigh 900mg of Fe 3 o 4 Add 720mL of ethanol and 180mL of water to the mixed solution, add 9mL of ammonia water, after 30 minutes of ultrasonication, slowly add 3mL of tetraethyl orthosilicate dropwise under the strong stirring of a dynamic stirrer, stir at room temperature for 6 hours and then under the action of an external magnetic field The sample was magnetically separated, washed by centrifugation with distilled water and ethanol, and dried in a vacuum oven at 80°C for 6 hours to obtain Fe with a core-shell structure. 3 o 4 / SiO 2 Binary nanocomposites;

[0031] 2. Weigh 36mL of absolute ethanol and add it to the PTFE lining, add 50mg of Fe 3 o 4 / SiO 2 Nanocomposite, sonicate for 10 minutes, slowly add 2 mL of n-tetrabutyl titanate dropwise, then add 2 mL of concentrated nitric acid and stir for 20 minutes. Put the polytetrafluoroethylene liner into a stainless steel high-pressure reaction kettle, seal it, heat it in an electric oven at 185°C for 15 hou...

Embodiment 3

[0035] 1. Weigh 900mg of Fe 3 o 4 Add 720mL of ethanol and 180mL of water to the mixed solution, add 9mL of ammonia water, after 30 minutes of ultrasonication, slowly add 3mL of tetraethyl orthosilicate dropwise under the strong stirring of a dynamic stirrer, stir at room temperature for 6 hours and then under the action of an external magnetic field The sample was magnetically separated, washed by centrifugation with distilled water and ethanol, and dried in a vacuum oven at 80°C for 6 hours to obtain Fe with a core-shell structure. 3 o 4 / SiO 2 Binary nanocomposites;

[0036] 2. Weigh 35mL of absolute ethanol and add it to the PTFE lining, add 50mg of Fe 3 o 4 / SiO 2 The nanocomposite was ultrasonicated for 10 minutes, 2 ml of n-tetrabutyl titanate was slowly added dropwise, and then 3 ml of concentrated nitric acid was added and stirred for 20 minutes. Put the polytetrafluoroethylene liner into a stainless steel high-pressure reaction kettle, seal it, heat it in an e...

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Abstract

The invention discloses a method for preparing a Fe3O4 / SiO2 / N-TiO2 magnetic visible-light-induced photocatalyst with nitric acid being a nitrogen source and belongs to the field of photocatalytic materials. A sol-gel method is adopted for synthesizing a Fe3O4 / SiO2 binary nano-composite with a core-shell structure, nitric acid serves as the nitrogen source, and a solvothermal method is adopted for preparing a Fe3O4 / SiO2 / N-TiO2 ternary composite at a low temperature. According to the method, nitric acid serves as the nitrogen source, heteropical deposition and effective nitrogen doping of TiO2 on the Fe3O4 / SiO2 binary nano-composite are realized at the same time, and the activity of the product in catalytic reduction of hexavalent chromium in water under the illumination of visible light is far higher than that of a Fe3O4 / SiO2 / N-TiO2 ternary composite obtained by using ammonium hydroxide as the nitrogen source; besides, the product has high magnetism, magnetic separation and recovery are easy, and the prepared catalyst can be used for efficiently treating hexavalent chromium bearing wastewater.

Description

technical field [0001] The invention belongs to the field of photocatalyst materials, in particular to magnetic N-doped TiO 2 Preparation method of visible light catalyst. Background technique [0002] Photocatalytic technology based on solar energy utilization and conversion has potential application prospects in solving environmental pollution problems and providing renewable energy. However, the lack of photocatalysts responsive to visible light (visible light accounts for about 50% of solar radiant energy) with high efficiency, stability, low toxicity, low price and easy separation and recovery has hindered the industrial application of photocatalytic technology. [0003] Anatase phase TiO 2 Nanoparticles are considered to be the most promising photocatalyst materials due to their non-toxicity, low price, large specific surface area, excellent chemical and photostability, and photocatalytic activity for many chemical reactions. However, anatase TiO 2 The wide bandgap...

Claims

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Application Information

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IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/33B01J35/39
Inventor 张永才温耀婷朱爱萍杨立新孔祥明
Owner YANGZHOU UNIV
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