| abstract |
The invention discloses a preparation method of a porous biochar-based MnFe 2 O 4 compound, which comprises the following steps: washing alfalfa with ultrapure water, drying, crushing and sieving to obtain alfalfa powder with uniform size; After the alfalfa powder is mixed with the activator, a co-pyrolysis reaction is carried out; the reaction mixture is cooled to room temperature, washed repeatedly with dilute hydrochloric acid and ultrapure water, and dried to obtain black powder biochar; the black powder biochar is placed in ultrapure water Disperse by medium ultrasonic, and then evenly mix with FeCl 3 ·6H 2 O and MnCl 2 ·4H 2 O with a molar ratio of 2-4:1, adjust the pH to be alkaline, and carry out high-temperature and high-pressure hydrothermal reaction; use ultrapure water, ethanol The reaction mixture in step 4 was washed in turn, and dried in vacuum. The preparation material of the invention is alfalfa agricultural waste, which has wide sources and low cost, can fully reuse the waste, and is beneficial to increase the added value of the alfalfa. |