A kind of preparation method of alkali lignin-based activated carbon and obtained product
A technology of alkali lignin and activated carbon, applied in chemical instruments and methods, carbon compounds, non-metallic elements, etc., can solve the problems of poor adsorption performance, little research, high cost, and achieve improved adsorption and desorption capacity, good industrial application. Prospect, effect of increased specific surface area
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Embodiment 1
[0033] Mix and stir 400g of black liquor powder with an appropriate amount of water to form a solution with a concentration of about 10%. After stirring evenly, filter with qualitative filter paper with a pore size of 10-15 μm to remove insoluble matter in the black liquor. Take the filtered filtrate and add hydrochloric acid with a concentration of 6mol / L several times until the pH value of the solution is adjusted to about 2, stir with a magnetic stirrer for 20min, and then use a qualitative filter paper with a pore size of 10-15 μm to filter the solution. The precipitate is taken out and vacuum-dried, and the sample is completely dried and then ground and passed through a 60-mesh sieve to obtain alkali lignin powder.
[0034] Alkali lignin powder is mixed with 5% hexamethylenetetramine and 8mol / L hydrochloric acid solution, and heated at 70°C for 2h (covered with a plastic film during heating); after heating, separate the alkali lignin powder , and washed with distilled wat...
Embodiment 2
[0037] The method in Example 1 was used to prepare alkali lignin powder. Then mix the alkali lignin powder with 10% hexamethylenetetramine and 10mol / L hydrochloric acid solution, and heat at 70°C for 2h; after the heating, separate the alkali lignin powder, and wash it with distilled water, and then Dry at a temperature of 103° C. for 1 hour. After drying, heat-stabilized alkali lignin powder is obtained. The prepared non-melting alkali lignin powder was heated from room temperature to 800 °C at a heating rate of 3 °C / min, and kept at 800 °C for 1 hour, then stopped heating, and naturally cooled down to room temperature. In the gas atmosphere, the flow rate of nitrogen gas is 200mL / min to prepare alkali lignin-based charcoal. The alkali lignin-based carbon was heated to 900° C. under the protection of nitrogen, and the alkali lignin-based carbon was activated for 60 minutes with a water vapor flow rate of 4.3 g / min to obtain alkali lignin-based activated carbon.
[0038]Usi...
Embodiment 3
[0040] The method in Example 1 was used to prepare alkali lignin powder. Then the alkali lignin powder is mixed with 10% hexamethylenetetramine and 12mol / L hydrochloric acid solution, and heated at 70°C for 2h; after the heating, the alkali lignin powder is separated, washed with distilled water, and then Dry at a temperature of 103° C. for 1 hour. After drying, heat-stabilized alkali lignin powder is obtained. Heat the prepared non-melting alkali lignin powder from room temperature to 700 °C at a heating rate of 3 °C / min, and keep it at 700 °C for 1 hour, then stop heating, cool down to room temperature naturally, and the whole process is under nitrogen. In the gas atmosphere, the flow rate of nitrogen gas is 200mL / min to prepare alkali lignin-based charcoal. The alkali lignin-based carbon was heated to 900° C. under the protection of nitrogen, and the alkali lignin-based carbon was activated for 30 minutes with a water vapor flow rate of 4 g / min to obtain alkali lignin-bas...
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