The invention discloses a preparation method and application of a perilla leaf
traditional Chinese medicine residue-based
charcoal composite material. Belongs to the technical field of
soil remediation materials. The method comprises the following three steps: by taking perilla leaf extraction residue as a
raw material, performing pretreatment, performing gradient
oxygen-limited
cracking and preparing a finished product: firstly, air-
drying the
raw material until the
water content is less than or equal to 15%, crushing and sieving with a 2mm
sieve;
nitrogen is introduced at the speed of 40-60 mL / min to serve as
shielding gas, the temperature is increased to 180-220 DEG C at the speed of 8-12 DEG C / min to be cracked for 1-2 h, the temperature is continuously increased to 400-450 DEG C to be cracked for 3-6 h, and the
temperature difference of two sections of
cracking is larger than or equal And finally,
quenching with
nitrogen, crushing and sieving with a 0.15 mm
sieve to obtain a finished product. The adsorption performance of the prepared
biochar composite material on Pb < 2 + > and Cd < 2 + > is remarkably improved; and the preparation process is free of
chemical addition, low in
raw material cost and suitable for in-situ remediation of Pb < 2 + > and Cd < 2 + > contaminated soil, and
resource utilization of the medical
solid waste is achieved.