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CoFe<2>O<4>/g-C<3>N<4> magnetic nanomaterial and preparation method therefor

A technology of magnetic nanometers and nanosheets, which is applied in the field of materials, can solve problems such as adverse environmental impacts, decreased catalytic activity, and impact on recycling, and achieve the effects of increasing recycling rates, improving catalytic activity, and realizing recycling

Active Publication Date: 2017-04-26
SUZHOU INST FOR ADVANCED STUDY USTC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these existing technologies have achieved certain results in solving the inherent problems of homogeneous catalytic systems, most of the heterogeneous catalysts still have inherent defects when they are actually applied to SR-AOPs: (1) a single cobalt Nanoparticles inevitably agglomerate due to their high surface energy during operation, resulting in a decrease in their catalytic activity and affecting their recycling; (2) direct exposure of catalyst active sites in aqueous solutions will inevitably lead to toxic (3) Although heterogeneous catalysts are easier to recover than homogeneous catalysts, centrifugation is often used in practical applications, which still produces high energy consumption

Method used

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  • CoFe&lt;2&gt;O&lt;4&gt;/g-C&lt;3&gt;N&lt;4&gt; magnetic nanomaterial and preparation method therefor
  • CoFe&lt;2&gt;O&lt;4&gt;/g-C&lt;3&gt;N&lt;4&gt; magnetic nanomaterial and preparation method therefor
  • CoFe&lt;2&gt;O&lt;4&gt;/g-C&lt;3&gt;N&lt;4&gt; magnetic nanomaterial and preparation method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1. CoFe 2 o 4 / g -C 3 N 4 Preparation method of magnetic nanomaterial

[0035] (1) g-C 3 N 4 Nanosheet Synthesis:

[0036] Put 5g of melamine into a crucible with a cover and place it in a muffle furnace, raise the temperature to 520°C at a rate of 5°C / min and keep it for 4h, and the obtained block g-C 3 N 4 Grind into powder, put it in the muffle furnace again and calcinate at 550°C for 3h to obtain g-C 3 N 4 Nanosheets.

[0037] (2)CoFe 2 o 4 / g -C 3 N 4 Synthesis of Magnetic Nanomaterials:

[0038] The g-C obtained in (1) 3 N 4 Weigh 200mg and disperse in 30mL ethylene glycol, ultrasonically disperse for 30min, after the belt is evenly dispersed, weigh 2mmol of FeCl 3 ·6H 2 O and 1 mmol CoCl 2 4H 2 O was completely dissolved in the above solution, and 15 mmol of sodium acetate was weighed as a protective agent and added to the above solution, and the mixed solution formed by stirring at room temperature was poured into a 50 mL autoclave, s...

Embodiment 2

[0040] The catalytic degradation experiment was carried out at room temperature. Take six 250mL beakers and add 100mL deionized water to each, add 1mL sulfonamide solution with a concentration of 1g / L, and then weigh the following six combinations and add them to the six beakers respectively. (1) 10mg CoFe 2 o 4 / g -C 3 N 4 +10mg PMS; (2) 10mg CoFe 2 o 4 +10mg PMS; (3) 10mg g-C 3 N 4 +10mg PMS; (4) 10mg CoFe 2 o 4 / g -C 3 N 4 ; (5) 10mg CoFe 2 o 4 ; (6) 10mg g-C 3 N 4 . Start timing from the addition of PMS, take 1mL samples at regular intervals, add 1mL methanol to quench SO4·- to stop sulfonamide degradation, and use HPLC to measure the remaining sulfonamide concentration. Experimental results ( figure 2 ) shows: CoFe 2 o 4 / g -C 3 N 4 The nanocomposite catalyzed PMS to produce SO4·-oxidative degradation of sulfonamide was very efficient, and the sulfonamide was completely degraded within 5min, while in the single CoFe 2 o 4 Under the catalysis of nanop...

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Abstract

The invention relates to the technical field of a material, and discloses a CoFe<2>O<4> / g-C<3>N<4> magnetic nanomaterial and a preparation method therefor. The preparation method comprises the steps of preparing g-C<3>N<4> nanosheets, and dispersing the g-C<3>N<4> nanosheets into ethylene glycol; then adding FeCl<3>.6H<2>O and CoCl<2>.4H<2>O and fully dissolving; and finally adding sodium acetate, stirring and calcining in a drying oven, and finally obtaining black sediments CoFe<2>O<4> / g-C<3>N<4>. According to the CoFe<2>O<4> / g-C<3>N<4> magnetic nanomaterial disclosed by the invention, the CoFe<2>O<4> nanoparticles are uniformly distributed on the g-C<3>N<4> nanosheets, so that CoFe<2>O<4> nanoparticle agglomeration can be prevented, and more active sites are provided to improve catalytic activity; in addition, the CoFe<2>O<4> nanoparticles are magnetic, so that the particles are distributed on the g-C<3>N<4> nanosheets sequentially to form bigger planar nanomaterials; and the planar nanomaterials can be separated more quickly under a magnetic field compared with independent CoFe<2>O<4> nanomaterials.

Description

technical field [0001] The present invention relates to the technical field of materials, more specifically, relates to a kind of CoFe 2 o 4 / g -C 3 N 4 Magnetic nanomaterials and methods for their preparation. Background technique [0002] Advanced oxidation processes (AOPs), also known as deep oxidation methods, use oxidants, catalysts, light, electric ultrasound and other technologies to generate a large number of highly oxidative oxidation active substances (such as OH, etc.) in the reaction, and Decompose organic pollutants into small molecular organic compounds or completely decompose them into CO through reaction processes such as addition, substitution, electron transfer and bond breaking between oxidation active substances and organic pollutants 2 、H 2 Sewage treatment technology for inorganic substances such as O. [0003] Based on the sulfate radical (SO 4 ·- ) advanced oxidation technology (SR-AOPs) is a new technology developed in recent years to efficie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/44
CPCB01D53/8687B01J27/24B01D2255/802B01J35/39
Inventor 李文卫陈常斌俞汉青李辰轩柳后起
Owner SUZHOU INST FOR ADVANCED STUDY USTC
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