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Fenton-like catalyst of graphene coated ferriferrous oxide (Fe3O4) micro-spheres as well as preparation method and application thereof

A technology of alkene-coated ferric tetroxide and catalyst, which is applied in the fields of nanomaterials and environmental science, can solve problems such as consumption, and achieve the effects of reducing cost, good catalytic efficiency and good stability

Active Publication Date: 2015-03-25
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although, graphene and Fe 3 o 4 Its synergistic effect can be fully utilized by loading, but Fe in the loading structure 3 o 4 Still in a naked state, easily consumed by the Fenton reaction process

Method used

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  • Fenton-like catalyst of graphene coated ferriferrous oxide (Fe3O4) micro-spheres as well as preparation method and application thereof
  • Fenton-like catalyst of graphene coated ferriferrous oxide (Fe3O4) micro-spheres as well as preparation method and application thereof
  • Fenton-like catalyst of graphene coated ferriferrous oxide (Fe3O4) micro-spheres as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 15% Graphene coated Fe 3 o 4 Preparation of magnetic Fenton-like catalyst:

[0035] (1) Preparation of precursor solution: Weigh 8.08g of ferric nitrate nonahydrate and 0.24g of graphene oxide, put them in 100ml of deionized water, and disperse them ultrasonically for 20min to form Fe 3+ Concentration of 0.2mol / L stable dispersed aqueous solution, ready for use;

[0036] (2) Send the prepared precursor solution through a syringe pump at a speed of 5ml / min through a gas-assisted atomizing nozzle, and then send it into a spray dryer, wherein the compressed air pressure is 0.4MPa, the temperature at the nozzle is 250°C, and the outlet Temperature is 150 ℃, and the microsphere (as figure 1 shown), its particle size is 1-3 μm, showing a wrinkled and rough shape;

[0037] (3) Place the obtained 15% graphene oxide-coated iron salt precursor microspheres in an Ar gas-protected atmosphere, calcinate at 450°C for 2h, and heat up at a rate of 2°C / min. When cooled to room tempe...

Embodiment 2

[0039] 30% Graphene coated Fe 3 o 4 Preparation of magnetic Fenton-like catalyst:

[0040] The graphene oxide content in embodiment 1 is increased to 0.48g, and all the other conditions are unchanged. After calcination in a protective atmosphere, 30% graphene-coated Fe can be obtained 3 o 4 microsphere material. Due to the increase of graphene content, composite microspheres with larger surface wrinkles are formed after self-assembly of gas-phase liquid droplets, and the particle size is about 2 μm (such as figure 2 shown). XRD tests show that the composite microspheres are composed of graphene and iron tetroxide (such as image 3 shown).

Embodiment 3

[0042] 30% Graphene coated Fe 3 o 4 Application of magnetic Fenton catalyst to remove methylene blue molecules:

[0043] (1) Adopt heterogeneous phase similar Fenton method to process containing methylene blue solution, take 250mL Erlenmeyer flask as reactor, methylene blue initial concentration is 10mg / L, get methylene blue solution 100mL, add simultaneously the preparation of embodiment 2 30% Graphene coated Fe 3 o 4 Catalyst 0.1g shake at room temperature for 1h, then add 1g30%H 2 o 2 Oscillate in a constant temperature oscillator with a rotational speed of 150 rpm and a temperature of 25°C.

[0044] (2) Take a sample every 30 minutes, obtain the supernatant by simple magnetic separation, and use a spectrophotometer to detect the concentration of methylene blue in the solution. The results showed that coating Fe with 30% graphene 3 o 4 The effect of the heterogeneous Fenton method of catalyst processing methylene blue solution is very good, and after reacting 210min...

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Abstract

The invention discloses a Fenton-like catalyst of graphene coated ferriferrous oxide (Fe3O4) micro-spheres as well as a preparation method and application thereof. The preparation method comprises the following steps: completely coating Fe3O4 particles by graphene; by taking an aqueous solution of inorganic ferric salt and graphene oxide as a precursor, rapidly preparing graphene oxide coated ferric salt precursor micro-spheres by adopting a spray-drying technology, and performing calcination reduction at a protective atmosphere to obtain a target product. The Fenton-like catalyst of the graphene coated Fe3O4 micro-spheres, disclosed by the invention, has relatively good catalytic efficiency and very good stability under the coordination of a hydrogen peroxide aqueous solution, can also be acquired by virtue of simple external magnetic field separation to be recycled and repeatedly used, can be used for reducing cost, and is an environment-friendly material.

Description

technical field [0001] The invention belongs to the field of nanomaterials and environmental science, in particular to a graphene-coated Fe 3 o 4 The preparation method and application of magnetic Fenton catalysts, the core of which is to use spray drying to prepare graphene oxide-coated iron salt precursors, and to calcine and reduce them into graphene-coated Fe in a protective atmosphere. 3 o 4 Microspheres. Background technique [0002] With the continuous deterioration of the human living environment, people pay more and more attention to the research on the purification and treatment methods of industrial three wastes. Among these methods, Fenton oxidation technology has gradually become a hot spot of attention, Fe 2+ with H 2 o 2 The reaction generates hydroxyl radicals with high oxidation ability, which can not only oxidize and break the conjugated structure, but also can further mineralize organic molecules into small molecules such as CO2 and water. This meth...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J35/08C02F1/72
Inventor 李春忠沈建华李云峰胡彦杰
Owner EAST CHINA UNIV OF SCI & TECH
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