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Preparation method of carbon quantum dot modified n-n type MFe12O19/CeO2 magnetic separation photocatalyst

A technology of mfe12o19 and carbon quantum dots, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of poor photocatalytic degradation ability and achieve cheap raw materials , Excellent effect, various effects

Active Publication Date: 2020-05-15
CHONGQING THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Sr(Ba)MFe 12 o 19 Shows a certain photocatalytic activity, but its photocatalytic degradation ability is poor

Method used

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  • Preparation method of carbon quantum dot modified n-n type MFe12O19/CeO2 magnetic separation photocatalyst
  • Preparation method of carbon quantum dot modified n-n type MFe12O19/CeO2 magnetic separation photocatalyst
  • Preparation method of carbon quantum dot modified n-n type MFe12O19/CeO2 magnetic separation photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]A carbon quantum dot modified n-n type MFe 12 o 19 / CeO 2 The preparation method of magnetic separation photocatalyst comprises the following steps:

[0025] Step 1: Weigh 50g of glucose and dissolve it in 80mL of aqueous solution. After it is completely dissolved, transfer it to a reaction kettle lined with polytetrafluoroethylene, and place the reaction kettle in a drying oven at a constant temperature of 180°C for 5 hours , to obtain water-soluble carbon quantum dots.

[0026] Step 2: Press SrFe 12 o 19 The mol ratio of Sr and Fe in the middle is that the ratio of Sr:Fe=1:12 takes by weighing soluble 0.2442g strontium nitrate, soluble 5.5938g ferric nitrate, takes by weighing and cation molar ratio is the chelating agent citric acid 4.7282g of 1.5:1; Weigh 20g of gel-collapsing agent glucose; weigh 9.5958g of acrylamide with a molar ratio of 9:1 to the cation; weigh 1.9192g of a cross-linking agent methylenebisacrylamide with a mass ratio of 5:1 to acrylamide Sl...

Embodiment 2

[0030] A carbon quantum dot modified n-n type MFe 12 o 19 / CeO 2 The preparation method of magnetic separation photocatalyst comprises the following steps:

[0031] Step 1: Weigh 50g of glucose and dissolve it in 80mL of aqueous solution. After it is completely dissolved, transfer it to a reaction kettle lined with polytetrafluoroethylene, and place the reaction kettle in a drying oven at a constant temperature of 180°C for 5 hours , to obtain water-soluble carbon quantum dots.

[0032] Step 2: Press SrFe 12 o 19 The mol ratio of Sr and Fe in the middle is that the ratio of Sr:Fe=1:12 takes by weighing soluble 0.2442g strontium nitrate, soluble 5.5938g ferric nitrate, takes by weighing and cation molar ratio is the chelating agent citric acid 4.7282g of 1.5:1; Weigh 20g of gel-collapsing agent glucose; weigh 9.5958g of acrylamide with a molar ratio of 9:1 to the cation; weigh 1.9192g of a cross-linking agent methylenebisacrylamide with a mass ratio of 5:1 to acrylamide S...

Embodiment 3

[0038] A carbon quantum dot modified n-n type MFe 12 o 19 / CeO 2 The preparation method of magnetic separation photocatalyst comprises the following steps:

[0039] Step 1: Weigh 50g of glucose and dissolve it in 80mL of aqueous solution. After it is completely dissolved, transfer it to a reaction kettle lined with polytetrafluoroethylene, and place the reaction kettle in a drying oven at a constant temperature of 180°C for 5 hours , to obtain water-soluble carbon quantum dots.

[0040] Step 2: Press SrFe 12 o 19 The mol ratio of Sr and Fe in the middle is that the ratio of Sr:Fe=1:12 takes by weighing soluble 0.2442g strontium nitrate, soluble 5.5938g ferric nitrate, takes by weighing and cation molar ratio is the chelating agent citric acid 4.7282g of 1.5:1; Weigh 20g of gel-collapsing agent glucose; weigh 9.5958g of acrylamide with a molar ratio of 9:1 to the cation; weigh 1.9192g of a cross-linking agent methylenebisacrylamide with a mass ratio of 5:1 to acrylamide S...

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Abstract

The invention discloses a preparation method of a carbon quantum dot modified n-n type MFe12O19 / CeO2 magnetic separation photocatalyst, wherein the preparation method comprises the steps: by using glucose as a raw material, synthesizing carbon quantum dots in a reaction kettle; using M metal salt, ferric salt or cerium salt as a raw material, adding a chelating agent, an anti-gel collapse agent, acrylamide and a cross-linking agent step by step, and polymerizing acrylamide and the cross-linking agent under the action of a field, to form gel; carrying out drying, sintering and other processes on the gel to synthesize MFe12O19 or CeO2 nanoparticles; ultrasonically stirring a proper amount of carbon quantum dots, MFe12O19 and CeO2 nanoparticles in an alcohol solution, pouring out supernatantliquid, drying, transferring into a box-type furnace, sintering, and adjusting the ratio of the carbon quantum dots, MFe12O19 and CeO2 nanoparticles, to obtain the n-n type MFe12O19 / CeO2 magnetic separation photocatalyst modified by the carbon quantum dots and having controllable photocatalytic activity. The photocatalyst is low in cost and easy to synthesize, and overcomes the defects that a traditional photocatalyst is low in charge separation efficiency and difficult to recycle.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic materials, in particular to n-n type MFe modified with carbon quantum dots 12 o 19 / CeO 2 Preparation method of magnetic separation photocatalyst. Background technique [0002] Photocatalytic degradation is to use radiation and photocatalysts to generate highly active free radicals in the reaction system, and then degrade all pollutants into inorganic substances through the process of addition, substitution, electron transfer and other processes between free radicals and organic pollutants. the process of. [0003] CeO 2 It is a common n-type wide bandgap semiconductor and has broad applications in semiconductor photocatalytic degradation of organic pollutants. However, since its bandgap value is about 3.23eV, it can only absorb ultraviolet light with a wavelength less than 384nm, and its utilization rate of sunlight is very low. In addition, how to recycle the photocatalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C02F1/30C02F101/30C02F101/38
CPCB01J23/83C02F1/30C02F2101/40C02F2101/38C02F2305/10C02F2101/308B01J35/33B01J35/39
Inventor 王仕发高华静刘欣怡李金煜赵欣欣孙光壮韩素斌
Owner CHONGQING THREE GORGES UNIV
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