Hydrophilic active carbon modified by sodium acetate and preparation method thereof

Abstract

The invention discloses hydrophilic active carbon modified by sodium acetate and a preparation method thereof. The hydrophilic active carbon is formed by loading sodium acetate on the surface of the carbon framework of active carbon. The preparation method comprises the following steps of: sequentially carrying out high-temperature treatment on an active carbon raw material, soaking in a sodium hydroxide solution, drying, activating, soaking in ethyl acetate and carrying out esterolytic reaction, nitrogen purging desorption and vacuum desorption to obtain the hydrophilic active carbon. The preparation method disclosed by the invention has the advantages of easiness for operation and low cost; the prepared hydrophilic active carbon has the advantages of stability in structure, large specific area, less carbon loss, high adsorption capacity and large volume on water vapors, stability in adsorption property and good reusability.

Description

technical field

[0001] The invention discloses a sodium acetate-modified hydrophilic activated carbon and a preparation method thereof, in particular to the process of synthesizing a hydrophilic organic functional group on the surface of the activated carbon by using an organic reagent; it belongs to the field of catalytic modification. Background technique

[0002] Water vapor is one of the ubiquitous substances in nature. However, in some specific environments, such as precision instrument laboratories, warehouses, petroleum liquefied gas stations, etc., it is necessary to strictly control the content of water vapor to prevent major safety accidents caused by short circuits, corrosion, condensation, etc. with loss.

[0003] Adsorption is widely used because of its simple operation, easy recovery and avoidance of secondary pollution. Activated carbon has become one of the preferred adsorbents due to its developed pore structure, large specific surface area, abundant surfa...

Examples

Embodiment 1

[0028] 1) Preparation of hydrophilic activated carbon

[0029] 100 g of ordinary commercial activated carbon was weighed with a balance and put into a beaker, washed 5 times with distilled water, and dried under vacuum at 125 °C for 12 h. Afterwards, the temperature of the vacuum furnace was raised to 800 °C and maintained for 1 h to remove the existing active groups on the surface of the activated carbon. Measure 1000mL of saturated sodium hydroxide solution, soak the activated carbon in the lye, seal it, let it stand for 5 days, wash it with deionized water 6 times, and dry it under vacuum at 120°C for 18h. The activated carbon was activated at 400°C under vacuum for 1.5h, and when it was naturally cooled to room temperature, it was soaked in ethyl acetate reagent, sealed and left to stand for 4 days. The ethyl acetate reagent was separated from the activated carbon by a gauze filter, and the activated carbon was reacted at 70° C. under vacuum for 20 h. The treated activat...

Embodiment 2

[0036] 1) Preparation of hydrophilic activated carbon

[0037]100 g of ordinary commercial activated carbon was weighed with a balance and put into a beaker, washed 5 times with distilled water, and dried under vacuum at 110 °C for 24 h. Afterwards, the temperature of the vacuum furnace was raised to 950 °C and maintained for 0.5 h to remove the existing active groups on the surface of the activated carbon. Measure 1000mL of saturated sodium hydroxide solution, soak the activated carbon in the lye, seal it, let it stand for 96h, wash it with deionized water 6 times, and dry it under vacuum at 110°C for 24h. The activated carbon was activated at 450°C under vacuum for 1 hour, and when it was naturally cooled to room temperature, it was soaked in ethyl acetate reagent, sealed, and left to stand for 120 hours. The ethyl acetate reagent was separated from the activated carbon by a gauze filter, and the activated carbon was reacted at 85° C. under vacuum for 18 h. The treated act...

technical field

[0001] The invention discloses a sodium acetate-modified hydrophilic activated carbon and a preparation method thereof, in particular to the process of synthesizing a hydrophilic organic functional group on the surface of the activated carbon by using an organic reagent; it belongs to the field of catalytic modification. Background technique

[0002] Water vapor is one of the ubiquitous substances in nature. However, in some specific environments, such as precision instrument laboratories, warehouses, petroleum liquefied gas stations, etc., it is necessary to strictly control the content of water vapor to prevent major safety accidents caused by short circuits, corrosion, condensation, etc. with loss.

[0003] Adsorption is widely used because of its simple operation, easy recovery and avoidance of secondary pollution. Activated carbon has become one of the preferred adsorbents due to its developed pore structure, large specific surface area, abundant surfa...

Examples

Embodiment 1

[0028] 1) Preparation of hydrophilic activated carbon

[0029] 100 g of ordinary commercial activated carbon was weighed with a balance and put into a beaker, washed 5 times with distilled water, and dried under vacuum at 125 °C for 12 h. Afterwards, the temperature of the vacuum furnace was raised to 800 °C and maintained for 1 h to remove the existing active groups on the surface of the activated carbon. Measure 1000mL of saturated sodium hydroxide solution, soak the activated carbon in the lye, seal it, let it stand for 5 days, wash it with deionized water 6 times, and dry it under vacuum at 120°C for 18h. The activated carbon was activated at 400°C under vacuum for 1.5h, and when it was naturally cooled to room temperature, it was soaked in ethyl acetate reagent, sealed and left to stand for 4 days. The ethyl acetate reagent was separated from the activated carbon by a gauze filter, and the activated carbon was reacted at 70° C. under vacuum for 20 h. The treated activat...

Embodiment 2

[0036] 1) Preparation of hydrophilic activated carbon

[0037]100 g of ordinary commercial activated carbon was weighed with a balance and put into a beaker, washed 5 times with distilled water, and dried under vacuum at 110 °C for 24 h. Afterwards, the temperature of the vacuum furnace was raised to 950 °C and maintained for 0.5 h to remove the existing active groups on the surface of the activated carbon. Measure 1000mL of saturated sodium hydroxide solution, soak the activated carbon in the lye, seal it, let it stand for 96h, wash it with deionized water 6 times, and dry it under vacuum at 110°C for 24h. The activated carbon was activated at 450°C under vacuum for 1 hour, and when it was naturally cooled to room temperature, it was soaked in ethyl acetate reagent, sealed, and left to stand for 120 hours. The ethyl acetate reagent was separated from the activated carbon by a gauze filter, and the activated carbon was reacted at 85° C. under vacuum for 18 h. The treated act...

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