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Magnetic nanometer composite photocatalysis material, and preparation method thereof

A composite photocatalytic and magnetic nanotechnology, applied in the field of g-C3N4/Ag/Fe3O4 nanocomposite photocatalytic materials and their preparation, can solve the problem of poor recyclability and reusability of catalysts, limiting the wide application of photocatalytic materials, and catalytic materials. Loss and other problems, to achieve the effects of adjustable and controllable photocatalytic activity and magnetic size, high visible light photocatalytic activity, and low production equipment requirements

Inactive Publication Date: 2016-01-13
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

but since g-C 3 N 4 The based materials are highly dispersed in the solution, and the recyclability and reusability of the catalyst are poor. Traditional separation techniques lead to a large loss of catalytic materials, thus limiting the wide application of such photocatalytic materials in practice.

Method used

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  • Magnetic nanometer composite photocatalysis material, and preparation method thereof
  • Magnetic nanometer composite photocatalysis material, and preparation method thereof
  • Magnetic nanometer composite photocatalysis material, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Weigh 3g of melamine into the crucible, put the crucible into the muffle furnace, heat the muffle furnace to 530°C at a heating rate of 2.3°C / min, keep the temperature and roast for 4h, and take out the crucible after cooling naturally , to obtain light yellow powder g-C 3 N 4 . combine figure 1 Medium g-C 3 N 4 It can be seen from the TEM image that pure g-C 3 N 4 The structure is thin nanosheet.

[0034] (2) Take 125mg of g-C obtained in step (1) 3 N 4 , dissolved in a mixture of 500ml ethanol and water (167ml ethanol, 333ml water), and ultrasonically dispersed for 5h.

[0035] (3) Take an appropriate amount of 1.838gFeCl 3 ·6H 2 O and 0.703g FeCl 2 4H 2 Dissolve O in 20ml distilled water to form a solution, and add g-C 3 N 4 In suspension, the mixture was stirred at 80 °C for 40 min to obtain a red suspension.

[0036] (4) Quickly add appropriate amount of NH 4 OH solution, control the pH value to 10, keep the temperature constant and continue to...

Embodiment 2

[0041] (1) Weigh 3g of melamine into the crucible, put the crucible into the muffle furnace, heat the muffle furnace to 520°C at a heating rate of 2°C / min, keep the temperature and roast for 4.5h, and wait for the crucible to cool naturally Take it out to get light yellow powder g-C 3 N 4 .

[0042] (2) Take 125mg of g-C obtained in step (1) 3 N 4 , dissolved in a mixture of 500ml ethanol and water (167ml ethanol, 333ml water), and ultrasonically dispersed for 4h.

[0043] (3) Take an appropriate amount of 1.838gFeCl 3 ·6H 2 O and 0.703g FeCl 2 4H 2 Dissolve O in 20ml distilled water to form a solution, and add g-C 3 N 4 In suspension, the mixture was stirred at 70 °C for 35 min to obtain a red suspension.

[0044] (4) Quickly add appropriate amount of NH 4 OH solution, control the pH value to 10.5, keep the temperature constant and continue to stir for 35min to obtain a black precipitate.

[0045] (5) After the product is cooled, filter it, wash it repeatedly with...

Embodiment 3

[0049] (1) Weigh 3g of melamine into the crucible, put the crucible into the muffle furnace, heat the muffle furnace to 550°C at a heating rate of 3°C / min, keep the temperature and roast for 5h, and take out the crucible after cooling naturally , to obtain light yellow powder g-C 3 N 4 .

[0050] (2) Take 125mg of g-C obtained in step (1) 3 N 4 , dissolved in a mixture of 500ml ethanol and water (167ml ethanol, 333ml water), and ultrasonically dispersed for 6h.

[0051] (3) Take an appropriate amount of 1.838gFeCl 3 ·6H 2 O and 0.703g FeCl 2 4H 2 Dissolve O in 20ml distilled water to form a solution, and add g-C 3 N 4 In suspension, the mixture was stirred at 90 °C for 30 min to obtain a red suspension.

[0052] (4) Quickly add appropriate amount of NH 4 OH solution, control the pH value to 9.5, keep the temperature constant and continue to stir for 30min to obtain a black precipitate.

[0053] (5) After the product is cooled, filter it, wash it repeatedly with dis...

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Abstract

The invention discloses a magnetic separable g-C3N4 / Ag / Fe3O4 nanometer composite photocatalysis material and a preparation method thereof. The preparation method comprises the following steps: with melamine as a precursor, preparing g-C3N4 by using a pyrolysis method; then preparing g-C3N4 / Fe3O4 by using an in-situ precipitation method; and adding a silver salt solution and carrying out reduction by NaBH4 to complete modification of silver nanoparticles so as to prepare the g-C3N4 / Ag / Fe3O4 nanometer composite photocatalysis material. The preparation method is simple and easily practicable, has good repeatability, can realize large-scale production and does not need a template and subsequent treatment; and the prepared photocatalysis material has high visible light catalysis efficiency, can realize magnetic separation of degraded pollutants, can be well recycled and shows wide application prospects in degradation of pollutants in a water body.

Description

technical field [0001] The present invention relates to a magnetically separable g-C 3 N 4 / Ag / Fe 3 o 4 A nanocomposite photocatalytic material and a preparation method thereof belong to the technical field of photocatalytic composite materials. Background technique [0002] Semiconductor material-based photocatalysts, as a green economic technology, have attracted extensive attention in the field of environmental governance and restoration for their potential application in the degradation of organic pollutants. However, the large-scale use of semiconductor photocatalytic materials is often limited by two aspects. Firstly, the wide band gap inhibits the absorption and utilization of sunlight by photocatalysts; secondly, the photocatalysts after degrading pollutants are dispersed in the treated solution, which is difficult to separate and recycle. Therefore, the high efficiency, stability, cost, and light use efficiency of materials have become important criteria for se...

Claims

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Application Information

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IPC IPC(8): B01J27/24
Inventor 李轶倪凌峰李杰郭燕飞
Owner HOHAI UNIV
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