Preparation method of bamboo nanocellulose/reduced graphene oxide composite carbon aerogel and application of preparation method

Abstract

The invention belongs to the field of environmental function material preparation and pollutant treatment and relates to a preparation method of bamboo nanocellulose / reduced graphene oxide composite carbon aerogel. The preparation method comprises the steps of firstly adopting bamboo as a raw material, preparing the nanocellulose through a peroxide pretreatment method and an ultrasonic stripping method; inducing nanocellulose and graphene oxide solution gelatinization through ethylenediamine to prepare the bamboo nanocellulose / graphene oxide aerogel; and washing to remove residual ethylenediamine and obtaining low-density, hydrophobic, porous and flame-retardant bamboo nanocellulose / reduced graphene oxide composite carbon aerogel by combining a freeze drying method and a high-temperature pyrolysis method. The material has high adsorption capacity on oil and organic solvent pollutants. By adopting cheap and renewable bamboo as the raw material, the prepared composite carbon aerogel material is excellent in performance and suitable for large-scale production.

Description

technical field

[0001] The invention belongs to the field of preparation of functional materials and treatment of pollutants, and relates to a preparation method and application of bamboo nanocellulose / reduced graphene oxide composite carbon airgel. Background technique

[0002] Water pollution caused by oil spills and discharge of oily industrial wastewater has caused serious energy, environmental and ecological problems worldwide. Adsorption technology is widely used to remove organic solvent pollutants due to its simple operation and high efficiency. In recent years, the performance of porous carbon materials in terms of oil absorption has attracted extensive attention. As an emerging porous carbon material, carbon aerogel has properties such as low apparent density, high porosity, and surface hydrophobicity. These unique physical properties enable it to selectively adsorb oil or hydrophobic organic solvents.

[0003] Graphene is a new type of two-dimensional carbon nan...

Examples

Embodiment 1

[0039] 1. Preparation of nanocellulose

[0040] (1) Bamboo is cut into fritters, washed and dried, and then crushed by a pulverizer and passed through a 40-mesh sieve to make bamboo powder; get 2.0g of bamboo powder and wrap it with filter paper, place it in a Soxhlet extractor, Use 150 mL of toluene and ethanol mixture with a volume ratio of 2:1 to wash repeatedly at 90 ° C for 10 h, and dry the sample to remove the residual toluene and ethanol.

[0041] (2) Take 2.0 g of the above-mentioned dried sample and add it to 100 mL of sodium chlorite solution with a concentration of 1.4% and a pH of 5.0, react at a temperature of 75°C for 1 hour, and repeat 5 times. After the reaction is completed, wash and dry Dry. Take 2.0g of the dried sample and add it to 100mL of 2% potassium hydroxide solution, react at 90°C for 4h, after the reaction is completed, react with 1% hydrochloric acid solution at 80°C for 2h, wash the sample to neutral, tumble dry.

[0042] (3) Take 1.0 g of the...

Embodiment 2

[0050] 1. Preparation of nanocellulose

[0051] (1) Bamboo is cut into fritters, washed and dried, then crushed by a pulverizer and passed through a 60-mesh sieve to make bamboo powder; get 2.0g of bamboo powder and wrap it with filter paper, place it in a Soxhlet extractor, Use 100 mL of toluene and ethanol mixture with a volume ratio of 2:1 to wash repeatedly at 90 ° C for 16 h, and dry the sample to remove the residual toluene and ethanol.

[0052] (2) Take 2.0 g of the above-mentioned dried sample and add it to 200 mL of sodium chlorite solution with a concentration of 1.4% and a pH of 5.0, react at a temperature of 75°C for 1 hour, and repeat 3 times. After the reaction is completed, wash and dry Dry. Take 2.0g of the dried sample and add it to 150mL of 2% potassium hydroxide solution, react at 95°C for 2h, after the reaction is completed, react with 1% hydrochloric acid solution at 80°C for 2h, wash the sample to neutral, tumble dry.

[0053] (3) Take 1.0 g of the sam...

Embodiment 3

[0061] 1. Preparation of nanocellulose

[0062] (1) Bamboo is cut into fritters, washed and dried, and then crushed by a pulverizer and passed through a 40-mesh sieve to make bamboo powder; get 2.0g of bamboo powder and wrap it with filter paper, place it in a Soxhlet extractor, Use 200mL of toluene and ethanol mixture with a volume ratio of 2:1 to wash repeatedly at 90°C for 24h, and dry the sample to remove the residual toluene and ethanol.

[0063] (2) Take 2.0 g of the above-mentioned dried sample and add it to 150 mL of sodium chlorite solution with a concentration of 1.4% and a pH of 5.0, react at a temperature of 75°C for 1 hour, and repeat 6 times. After the reaction is completed, wash and dry Dry. Take 2.0g of the dried sample and add it to 200mL of 2% potassium hydroxide solution, react at 85°C for 2h, after the reaction is completed, react with 1% hydrochloric acid solution at 80°C for 2h, wash the sample to neutral, tumble dry.

[0064] (3) Take 1.0 g of the sam...

technical field

[0001] The invention belongs to the field of preparation of functional materials and treatment of pollutants, and relates to a preparation method and application of bamboo nanocellulose / reduced graphene oxide composite carbon airgel. Background technique

[0002] Water pollution caused by oil spills and discharge of oily industrial wastewater has caused serious energy, environmental and ecological problems worldwide. Adsorption technology is widely used to remove organic solvent pollutants due to its simple operation and high efficiency. In recent years, the performance of porous carbon materials in terms of oil absorption has attracted extensive attention. As an emerging porous carbon material, carbon aerogel has properties such as low apparent density, high porosity, and surface hydrophobicity. These unique physical properties enable it to selectively adsorb oil or hydrophobic organic solvents.

[0003] Graphene is a new type of two-dimensional carbon nan...

Examples

Embodiment 1

[0039] 1. Preparation of nanocellulose

[0040] (1) Bamboo is cut into fritters, washed and dried, and then crushed by a pulverizer and passed through a 40-mesh sieve to make bamboo powder; get 2.0g of bamboo powder and wrap it with filter paper, place it in a Soxhlet extractor, Use 150 mL of toluene and ethanol mixture with a volume ratio of 2:1 to wash repeatedly at 90 ° C for 10 h, and dry the sample to remove the residual toluene and ethanol.

[0041] (2) Take 2.0 g of the above-mentioned dried sample and add it to 100 mL of sodium chlorite solution with a concentration of 1.4% and a pH of 5.0, react at a temperature of 75°C for 1 hour, and repeat 5 times. After the reaction is completed, wash and dry Dry. Take 2.0g of the dried sample and add it to 100mL of 2% potassium hydroxide solution, react at 90°C for 4h, after the reaction is completed, react with 1% hydrochloric acid solution at 80°C for 2h, wash the sample to neutral, tumble dry.

[0042] (3) Take 1.0 g of the...

Embodiment 2

[0050] 1. Preparation of nanocellulose

[0051] (1) Bamboo is cut into fritters, washed and dried, then crushed by a pulverizer and passed through a 60-mesh sieve to make bamboo powder; get 2.0g of bamboo powder and wrap it with filter paper, place it in a Soxhlet extractor, Use 100 mL of toluene and ethanol mixture with a volume ratio of 2:1 to wash repeatedly at 90 ° C for 16 h, and dry the sample to remove the residual toluene and ethanol.

[0052] (2) Take 2.0 g of the above-mentioned dried sample and add it to 200 mL of sodium chlorite solution with a concentration of 1.4% and a pH of 5.0, react at a temperature of 75°C for 1 hour, and repeat 3 times. After the reaction is completed, wash and dry Dry. Take 2.0g of the dried sample and add it to 150mL of 2% potassium hydroxide solution, react at 95°C for 2h, after the reaction is completed, react with 1% hydrochloric acid solution at 80°C for 2h, wash the sample to neutral, tumble dry.

[0053] (3) Take 1.0 g of the sam...

Embodiment 3

[0061] 1. Preparation of nanocellulose

[0062] (1) Bamboo is cut into fritters, washed and dried, and then crushed by a pulverizer and passed through a 40-mesh sieve to make bamboo powder; get 2.0g of bamboo powder and wrap it with filter paper, place it in a Soxhlet extractor, Use 200mL of toluene and ethanol mixture with a volume ratio of 2:1 to wash repeatedly at 90°C for 24h, and dry the sample to remove the residual toluene and ethanol.

[0063] (2) Take 2.0 g of the above-mentioned dried sample and add it to 150 mL of sodium chlorite solution with a concentration of 1.4% and a pH of 5.0, react at a temperature of 75°C for 1 hour, and repeat 6 times. After the reaction is completed, wash and dry Dry. Take 2.0g of the dried sample and add it to 200mL of 2% potassium hydroxide solution, react at 85°C for 2h, after the reaction is completed, react with 1% hydrochloric acid solution at 80°C for 2h, wash the sample to neutral, tumble dry.

[0064] (3) Take 1.0 g of the sam...

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