Nitrogen-rich carbon spheres and preparation method thereof, and application of nitrogen-rich carbon spheres as adsorbent in acidic chrome-containing wastewater treatment
A carbon sphere and nitrogen-enriched technology, applied in the direction of adsorption water/sewage treatment, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of poor effect of hexavalent chromium, high carcinogenicity, high toxicity, etc. Achieve uniform morphology, high specific surface area, and reduce column pressure drop
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Embodiment 1
[0039] Step 1. Dissolve 1.08 g of m-phenylenediamine and 0.7 g of hexamethylenetetramine in 52 mL of deionized water, and then add 2 mL of 28 wt % ammonia solution.
[0040] Step 2: After stirring until the solution becomes clear, put it into a polytetrafluoroethylene jar, and heat it in water at 90°C for 24 hours.
[0041] Step 3, the jar was naturally cooled to room temperature and then centrifuged to obtain an orange solid precipitate. The obtained solid was washed several times with deionized water until the pH was equal to 7. The solid (nitrogen-containing polymer) was then dried at 80° C. for 24 h.
[0042] Step 4, impregnating the dry solid (nitrogen-containing polymer) in a mass fraction of 10wt% ZnCl 2 24h in solution, where ZnCl 2 The mass ratio of polymer / polymer is 0.25:1.
[0043] Step five, place the solution impregnated with solid in N 2 It was activated at 800°C for 1 h in a tube furnace with a flow rate of 50mL / min, and the heating rate was 5°C / min.
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Embodiment 2
[0050] Step 1. Dissolve 1.08 g of m-phenylenediamine and 0.7 g of hexamethylenetetramine in 52 mL of deionized water, and then add 2 mL of 28 wt % ammonia solution.
[0051] Step 2: After stirring until the solution becomes clear, put it into a polytetrafluoroethylene jar, and heat it in water at 90°C for 24 hours.
[0052] Step 3, the jar was naturally cooled to room temperature and then centrifuged to obtain an orange solid precipitate. The obtained solid was washed several times with deionized water until the pH was equal to 7. The solid (nitrogen-containing polymer) was then dried at 80° C. for 24 h.
[0053] Step 4, impregnating the dry solid (nitrogen-containing polymer) in a mass fraction of 10wt% ZnCl 2 24h in solution, where ZnCl 2 The mass ratio of polymer / polymer is 0.5:1.
[0054] Step five, place the solution impregnated with solid in N 2 It was activated at 800°C for 1 h in a tube furnace with a flow rate of 50mL / min, and the heating rate was 5°C / min.
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