Preparation method of hydroxylated magnetic graphene oxide adsorbent

Abstract

The invention discloses a preparation method of a hydroxylated magnetic graphene oxide adsorbent, and belongs to the field of environment-friendly materials. The material takes graphene oxide as a carrier, and Fe3O4 particles (100-200nm) with magnetism are loaded through solvothermal reaction. Then a high-concentration hydrogen peroxide solution is used for carrying out hydroxylation modification on the magnetic adsorbent, the content of oxygen-containing functional groups on the surface is increased, and the adsorption capacity on methylene blue is improved. According to the prepared adsorbent, Fe3O4 particles are introduced into a graphene oxide sheet layer, the stripping degree of graphene oxide is increased, and the specific surface area is enlarged. Furthermore, active sites on the surface of the composite material are increased through hydroxylation reaction, the adsorption performance of the material is enhanced, and meanwhile, the loaded magnetic particles are beneficial to recovery of the adsorbent. The preparation method is simple and easy to operate, the adsorption process is green and environment-friendly, methylene blue in dye wastewater can be effectively adsorbed and can be recycled, and secondary pollution is avoided.

Description

technical field

[0001] The invention relates to a hydroxylated magnetic graphene oxide adsorbent used in wastewater treatment and a preparation method thereof, which belongs to the field of environmental protection materials and is suitable for removing organic dyes such as methylene blue and methyl orange in industrial wastewater. Background technique

[0002] With the deepening of our country's industrialization process, the control and treatment of environmental pollution has become an urgent problem that people need to solve. In industrial production, especially in the production of clothing printing and dyeing, plastics, leather, paper products and inks, organic dyes are used in large quantities, resulting in wastewater containing various dye pollutants. The pollutants in this type of wastewater have the characteristics of complex composition, high chroma, difficult to degrade, and high toxicity hazards. If they cannot be effectively purified before discharge, they will...

Examples

Embodiment 1

[0024] (1) Weigh 1.0 g of graphene oxide, stir it magnetically for 30 minutes, then use a cell pulverizer to ultrasonically disperse it for 30 minutes, and disperse it in an ethylene glycol solvent. Weigh 2 g of sodium dodecylbenzene sulfonate as a surfactant, and stir for 30 min until it is completely dissolved. Subsequently, 1.5 g of ferric chloride pentahydrate was added, and stirred for 2 h to ensure that the iron ions were fully combined with the graphene oxide sheets. Finally, 10.8 g of sodium oxalate was added and stirred for 30 min until a uniform suspension was formed.

[0025] (2) Transfer the suspension prepared in (1) to a hydrothermal reaction kettle, then put the reaction kettle into an oven, set the reaction temperature to 190° C., and the reaction time to 16 hours. After the reaction is over, take it out after cooling to room temperature, use a strong magnet to separate, use deionized water and absolute ethanol as cleaning agents, wash each for 3 times, put it...

Embodiment 2

[0028] (1) Weigh 1.0 g of graphene oxide, stir it magnetically for 30 minutes, then use a cell pulverizer to ultrasonically disperse it for 30 minutes, and disperse it in an ethylene glycol solvent. Weigh 2 g of sodium dodecylbenzene sulfonate as a surfactant, and stir for 30 min until it is completely dissolved. Subsequently, 1.5 g of ferric chloride pentahydrate was added, and stirred for 2 h to ensure that the iron ions were fully combined with the graphene oxide sheets. Finally, 10.8 g of sodium oxalate was added and stirred for 30 min until a uniform suspension was formed.

[0029] (2) Transfer the suspension prepared in (1) to a hydrothermal reaction kettle, then put the reaction kettle into an oven, set the reaction temperature to 190° C., and the reaction time to 16 hours. After the reaction is over, take it out after cooling to room temperature, use a strong magnet to separate, use deionized water and absolute ethanol as cleaning agents, wash each for 3 times, put it...

Embodiment 3

[0032] (1) Weigh 0.5 g of graphene oxide, stir it magnetically for 30 min, and then disperse it in an ethylene glycol solvent using an ultrasonic cell pulverizer for 30 min. Weigh 2 g of sodium dodecylbenzene sulfonate as a surfactant, and stir for 30 min until it is completely dissolved in the dispersion. Subsequently, 1.5 g of ferric chloride pentahydrate was added, and stirred for 2 h to ensure that the iron ions were fully combined with the graphene oxide sheets. Finally, 10.8 g of sodium oxalate was added and stirred for 30 min until a uniform suspension was formed.

[0033] (2) Transfer the suspension prepared in (1) to a hydrothermal reaction kettle, then put the reaction kettle into an oven, set the reaction temperature to 190° C., and the reaction time to 16 hours. After the reaction is over, take it out after cooling to room temperature, use a strong magnet to separate, use deionized water and absolute ethanol as cleaning agents, wash each for 3 times, put it in an ...

technical field

[0001] The invention relates to a hydroxylated magnetic graphene oxide adsorbent used in wastewater treatment and a preparation method thereof, which belongs to the field of environmental protection materials and is suitable for removing organic dyes such as methylene blue and methyl orange in industrial wastewater. Background technique

[0002] With the deepening of our country's industrialization process, the control and treatment of environmental pollution has become an urgent problem that people need to solve. In industrial production, especially in the production of clothing printing and dyeing, plastics, leather, paper products and inks, organic dyes are used in large quantities, resulting in wastewater containing various dye pollutants. The pollutants in this type of wastewater have the characteristics of complex composition, high chroma, difficult to degrade, and high toxicity hazards. If they cannot be effectively purified before discharge, they will...

Examples

Embodiment 1

[0024] (1) Weigh 1.0 g of graphene oxide, stir it magnetically for 30 minutes, then use a cell pulverizer to ultrasonically disperse it for 30 minutes, and disperse it in an ethylene glycol solvent. Weigh 2 g of sodium dodecylbenzene sulfonate as a surfactant, and stir for 30 min until it is completely dissolved. Subsequently, 1.5 g of ferric chloride pentahydrate was added, and stirred for 2 h to ensure that the iron ions were fully combined with the graphene oxide sheets. Finally, 10.8 g of sodium oxalate was added and stirred for 30 min until a uniform suspension was formed.

[0025] (2) Transfer the suspension prepared in (1) to a hydrothermal reaction kettle, then put the reaction kettle into an oven, set the reaction temperature to 190° C., and the reaction time to 16 hours. After the reaction is over, take it out after cooling to room temperature, use a strong magnet to separate, use deionized water and absolute ethanol as cleaning agents, wash each for 3 times, put it...

Embodiment 2

[0028] (1) Weigh 1.0 g of graphene oxide, stir it magnetically for 30 minutes, then use a cell pulverizer to ultrasonically disperse it for 30 minutes, and disperse it in an ethylene glycol solvent. Weigh 2 g of sodium dodecylbenzene sulfonate as a surfactant, and stir for 30 min until it is completely dissolved. Subsequently, 1.5 g of ferric chloride pentahydrate was added, and stirred for 2 h to ensure that the iron ions were fully combined with the graphene oxide sheets. Finally, 10.8 g of sodium oxalate was added and stirred for 30 min until a uniform suspension was formed.

[0029] (2) Transfer the suspension prepared in (1) to a hydrothermal reaction kettle, then put the reaction kettle into an oven, set the reaction temperature to 190° C., and the reaction time to 16 hours. After the reaction is over, take it out after cooling to room temperature, use a strong magnet to separate, use deionized water and absolute ethanol as cleaning agents, wash each for 3 times, put it...

Embodiment 3

[0032] (1) Weigh 0.5 g of graphene oxide, stir it magnetically for 30 min, and then disperse it in an ethylene glycol solvent using an ultrasonic cell pulverizer for 30 min. Weigh 2 g of sodium dodecylbenzene sulfonate as a surfactant, and stir for 30 min until it is completely dissolved in the dispersion. Subsequently, 1.5 g of ferric chloride pentahydrate was added, and stirred for 2 h to ensure that the iron ions were fully combined with the graphene oxide sheets. Finally, 10.8 g of sodium oxalate was added and stirred for 30 min until a uniform suspension was formed.

[0033] (2) Transfer the suspension prepared in (1) to a hydrothermal reaction kettle, then put the reaction kettle into an oven, set the reaction temperature to 190° C., and the reaction time to 16 hours. After the reaction is over, take it out after cooling to room temperature, use a strong magnet to separate, use deionized water and absolute ethanol as cleaning agents, wash each for 3 times, put it in an ...

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