Preparation method for walnut shell active carbon adsorbent for purifying low concentration phosphine
A technology of activated carbon adsorption and walnut shell, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve the problems of small adsorption capacity, consumption of oxidants, and the remaining concentration of phosphine is not mentioned, and achieve high adsorption activity. , the effect of saving processing costs
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[0020] Example 1:
[0021] The raw walnut shells are crushed to a particle size of 0.5~1cm and washed, and dried at 100°C until constant weight; the washed and dried raw walnut shells are carbonized in a tube furnace under nitrogen protection for 1 hour, and the carbonization temperature is 600°C. The heating rate is 10℃ / min; the carbonized material and the activator potassium hydroxide are mixed uniformly in a certain proportion, and then they are placed in a tube furnace for nitrogen protection and activation for 1 hour. The mass ratio of the carbonized material to the activator potassium hydroxide is 1 :2, the activation temperature is 800℃, the heating rate is 10℃ / min; wash the activated walnut shell sample with 0.1mol / L hydrochloric acid twice, and rinse with hot distilled water to neutrality, the washed sample is constant weight at 110℃ Then the walnut shell activated carbon is obtained; the walnut shell activated carbon is subjected to metal loading modification treatment,...
Example Embodiment
[0024] Example 2:
[0025] The raw walnut shells are crushed to a particle size of 0.5~1cm and washed, and dried at 100°C until constant weight; the washed and dried raw walnut shells are carbonized in a tube furnace under nitrogen protection for 1 hour, where the carbonization temperature is 700°C. The heating rate is 20℃ / min; the carbonized material and the activator potassium hydroxide are mixed uniformly according to a certain ratio, and then they are placed in a tube furnace for nitrogen protection and activation for 1 hour. The mass ratio of the carbonized material to the activator potassium hydroxide is 1 :2, the activation temperature is 900℃, the heating rate is 15℃ / min; the activated walnut shell samples are washed twice with 0.1mol / L hydrochloric acid, and rinsed with hot distilled water to neutrality, the washed sample is constant weight at 110℃ Then the walnut shell activated carbon is obtained; the walnut shell activated carbon is subjected to metal loading modifica...
Example Embodiment
[0028] Example 3:
[0029] The raw walnut shells are crushed to a particle size of 0.5~1cm and washed, and dried at 100°C until constant weight; the washed and dried raw walnut shells are carbonized in a tube furnace under nitrogen protection for 1 hour, where the carbonization temperature is 700°C. The heating rate is 5℃ / min; the carbonized material and the activator potassium hydroxide are mixed uniformly in a certain proportion, and then they are placed in a tube furnace for nitrogen protection and activation for 1 hour. The mass ratio of the carbonized material to the activator potassium hydroxide is 1 :4, the activation temperature is 700℃, the heating rate is 20℃ / min; wash the activated walnut shell sample with 0.1mol / L hydrochloric acid twice, and rinse with hot distilled water to neutrality, the washed sample will be constant weight at 110℃ Then the walnut shell activated carbon is obtained; the walnut shell activated carbon is subjected to metal loading modification trea...
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