The invention discloses a magnetic
Fagopyrum tataricum shell
biochar preparation method, which comprises: S1, immersing
Fagopyrum tataricum shell in deionized water for 30 min, cleaning, and
drying ina
drying box at a temperature of 105 DEG C; S2, crushing the
Fagopyrum tataricum shell, and screening, wherein the screening hole has a
diameter of 0.075 mm, and the
sieve is a 200 mesh
sieve; S3, mixing activators FeCl3.6H2O and FeCl2.4H2O according to a
molar ratio of Fe<3+> to Fe<2+> of 2:1, adding 370 ml of deionized water, and completely dissolving; S4, adding 15 g of the Fagopyrum tataricumshell, adding 30 ml of concentrated
ammonia water, carrying out high speed stirring for 1 h, carrying out sealing standing for 1 h, washing with
ultrapure water to achieve a
neutral state, placing inan oven at a temperature of 70 DEG C, and
drying to achieve a constant weight to obtain magnetic
Fagopyrum tataricum shell; and S5, carrying out sealed heating on the magnetic
Fagopyrum tataricum shell in a
muffle furnace at a temperature of 700 DEG C, carrying out
carbonization for 3 h, and storing in a dryer after the heating is completely performed so as to obtain the magnetic
Fagopyrum tataricum shell
biochar. In the prior art, the
biomass charcoal cannot effectively remove
heavy metals from polluted water bodies, the
recovery is difficult, the process is complex, the cost is high, and secondary
pollution is easily generated. According to the present invention, the problems in the prior art can be solved.