Preparation method of biological activated carbon capable of safely adsorbing cadmium in water
A biochar and water body technology, applied in the direction of adsorption of water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of secondary pollution cost and low adsorption efficiency, so as to prevent secondary pollution and avoid The use of organic alkoxides and the effect of cumbersome operation steps
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[0042] Embodiment 1, the preparation method of biochar, carry out following steps successively:
[0043] Put the harvested elephant grass in a ventilated environment to dry naturally for a week (at this time, the moisture content is 12%), chop, grind into powder with a particle size of ≤10mm, and then put it into an oven for drying at 105°C for 3 hours; Then put it into the carbonization furnace, feed nitrogen, and raise the temperature to 500°C at a rate of 5°C / min to carry out the carbonization reaction with oxygen barrier, and feed nitrogen gas during the process of carbonization with oxygen barrier to maintain the pressure in the carbonization furnace chamber at 0.05Mpa ; Insulation reaction for 2 hours; then cooled to room temperature, and the granular product was crushed through a 60-100 mesh sieve to obtain powdered biochar (hereinafter referred to as biochar powder).
[0044] The yield of biochar powder (BC500) obtained in this embodiment is 38.72%, and its specific su...
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