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Magnetic nanometer oxidized graphene and preparation method and application thereof

A magnetic nanometer and graphene technology, applied in the field of applied chemistry and biochemical industry, can solve the problems of polluted environment and difficult separation, and achieve the effect of high catalytic efficiency, high dispersion and excellent catalytic performance.

Active Publication Date: 2013-12-04
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the catalysts used in production are liquid strong acids or strong bases, which bring difficulties to separation and pollute the environment.

Method used

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  • Magnetic nanometer oxidized graphene and preparation method and application thereof
  • Magnetic nanometer oxidized graphene and preparation method and application thereof
  • Magnetic nanometer oxidized graphene and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Improved Hummers method prepares graphene oxide

[0026] The improved Hummers method prepares the steps of graphene oxide as follows:

[0027] 1) Low-temperature reaction: Measure 23mL of concentrated sulfuric acid and pour it into a beaker, put the beaker in an ice bath and cool it below 4°C, weigh 1g of graphite powder and 0.5g of sodium nitrate into the beaker, add 3g of high manganese slowly after 1h Potassium acid, then put the beaker on a magnetic stirrer, control the temperature not to exceed 10°C, and the reaction time is 2 hours in total;

[0028] 2) Medium-temperature reaction: After the low-temperature reaction is completed, move the above beaker to a constant temperature water bath, control the temperature of the water bath at 38°C, react for 0.5h, and keep stirring moderately to obtain a brown mixture;

[0029] 3) High temperature reaction: Slowly add 80ml of distilled water to the obtained brown mixture, keep the temperature of the mixture a...

Embodiment 2

[0032] Embodiment 2: the method 1 of the preparation of magnetic nano graphene oxide

[0033] The preparation method of magnetic nano-graphene oxide is as follows: dry the graphene oxide prepared in step 1), grind it to a fine powder, weigh 6 mg and disperse it in 6 ml of water, and ultrasonically oscillate for 0.5 h to obtain a graphene oxide solution. Ferrous sulfate was dissolved into the graphene oxide solution, and 0.001 g of surfactant SDS was added at the same time, and exposed to the air for 0.5 hours. Then under strong stirring conditions, 1mol / L NaOH was added dropwise to PH>9, the stirred suspension was black, and the reaction product iron ferric oxide nanoparticles were formed to load on the surface of graphene, the reaction product was filtered, and then washed with a large amount of distilled water, It was dried in a freeze dryer to obtain magnetic nano graphene oxide.

Embodiment 3

[0034] Embodiment 3: the method 2 of the preparation of magnetic nano graphene oxide

[0035] The preparation method of magnetic nano-graphene oxide is as follows: dry the graphene oxide prepared in step 1), grind it to a fine powder, weigh 6 mg and disperse it in 10 ml of water, and ultrasonically oscillate for 1 hour to obtain a graphene oxide solution. Dilute 1 g of sulfurous acid Iron was dissolved into the graphene oxide solution while adding 0.002 g of surfactant SDS and exposed to air for 0.5 h. Then under strong stirring conditions, 1mol / L NaOH was added dropwise to PH>9, the stirred suspension was black, and the reaction product iron ferric oxide nanoparticles were formed to load on the surface of graphene, the reaction product was filtered, and then washed with a large amount of distilled water, It was dried in a freeze dryer to obtain magnetic nano graphene oxide.

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Abstract

The invention discloses a preparation method of magnetic nanometer oxidized graphene. The preparation method comprises the following steps: 1) adopting an improved Hummers method to prepare the oxidized graphene; 2) adopting a hydrothermal method to load ferroferric oxide nano particles to the surface of the oxidized graphene prepared in the step 1) under the alkaline environment of pH>9, and therefore preparing the magnetic nanometer oxidized graphene. The invention further discloses the magnetic nanometer oxidized graphene and application of the magnetic nanometer oxidized graphene in biodiesel preparation. According to a new method for synthesizing biodiesel by utilizing the magnetic nanometer oxidized graphene in a catalytic mode, the dispersity of the magnetic oxidized graphene is high, the catalytic efficiency is high, the catalytic process is environmentally friendly, and the non-corrosiveness catalyst has excellent catalytic performance and conforms to the requirements for saving energy and reducing emission.

Description

technical field [0001] The invention belongs to the technology in the fields of applied chemistry and biochemical industry, and in particular relates to a magnetic nanometer graphene oxide and its preparation method and application. Background technique [0002] With the increasing shortage of non-renewable resources such as oil and the increasingly serious pollution caused by the petrochemical industry, renewable resources such as biodiesel have attracted people's attention. Biodiesel refers to a renewable diesel fuel that can replace petrochemical diesel oil, which is made from oil crops, wild oil plants, engineering microalgae and other aquatic vegetable oils, animal oils, and catering waste oils through transesterification and other processes. . Biodiesel is a kind of biomass energy, which is a mono-alkyl ester of long-chain fatty acid obtained from biomass by transesterification and other technologies. Its properties are very close to diesel, and its environmental pro...

Claims

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Application Information

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IPC IPC(8): B01J23/745B82Y30/00B82Y40/00C11C3/10C10L1/02
Inventor 李强李斌季更生冯圆圆张飞吕梦雅敖冉
Owner JIANGSU UNIV OF SCI & TECH
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