Method for hydrothermally assisted production of lignin activated carbon with high specific surface area

[0027] The nickel ark containing 5 g of lignin was placed in a high-temperature tube furnace, and the temperature was raised from room temperature to 900 °C at a rate of 10 °C / min in a nitrogen atmosphere of 200 mL / min, and kept at this temperature for 80 min. The tube furnace was cooled to room temperature, the samples were taken out, washed with water until neutral, and then dried in an oven at 105 °C to constant weight. That is, lignin pyrolytic carbon (named AAC-1) is obtained. through figure 2 Nitrogen adsorption-desorption curve test (analyzed by Autosorb-iQ automatic gas adsorption analyzer, the same below), the specific surface area of ​​AAC-1 is 669.27 m 2 / g.

[0029] Put 5 g of lignin in a nickel ark, add 10 g of KOH and 10 mL of deionized water, and stir slowly until the mixture is uniform. Then, the nickel ark containing the mixture was placed in a high-temperature tube furnace, and the temperature was raised from room temperature to 900 °C at a rate of 10 °C / min in a nitrogen atmosphere of 200 mL / min, and kept at this temperature for 80 min. The tube furnace was cooled to room temperature, the samples were taken out, washed with acid and water until neutral, and then dried in an oven at 105 °C to constant weight. That is, a lignin activated carbon with a higher specific surface area (named AAC-2) is obtained. According to the nitrogen adsorption-desorption curve test, the specific surface area of ​​AAC-2 is 1643.93 m 2 / g.

[0031] Such as figure 1 As shown, 5 g of lignin and 60 mL of deionized water were placed in the reactor and mixed evenly, and then the reactor was placed in a muffle furnace at 100 °C for 2 hours. The reactor was cooled to room temperature, poured out the hydrothermally assisted treated mixture into a nickel ark and added 10 g KOH, and stirred slowly until the mixture was uniform. Then put the nickel ark containing the mixture (mixed evenly) in a high-temperature tube furnace, in a nitrogen atmosphere of 200 mL / min, from room temperature to 900 °C at a rate of 10 °C / min, and at this temperature Keep warm for 80 min. The tube furnace was cooled to room temperature, the samples were taken out, washed with acid and water until neutral, and then dried in an oven at 105 °C to constant weight. That is, lignin activated carbon with high specific surface area (named AAC-3) is obtained. According to the nitrogen adsorption-desorption curve test, the specific surface area of ​​AAC-3