▎ 摘　　要

NOVELTY - Preparing graphene-like biochar from Dalangba grass involves collecting the big wolf, removing leaves, washing and air drying, and then drying. The dried big wolf is crushed and sieved to obtain the big wolf grass powder. An oxygen-limited pyrolysis is performed on the big wolf grass powder to obtain big wolf grass biochar. The grass biochar is mixed with alkali, and after activation under oxygen-limited conditions, cool to room temperature, take it out and mix with 0.09-1.1M, and mixed with hydrochloric acid, and then washed with deionized water until the pH remains unchanged, and dried to obtain graphene-like biochar prepared from Dalangpao. USE - Method for preparing graphene-like biochar from Dalangba grass. ADVANTAGE - The method uses the invasive plant big wolf grass as the raw material, after air-drying and drying, it is carbonized in a nitrogen atmosphere. A catalytic activation of alkali is used to obtain graphene-like biochar prepared from Dalangpao, which can be used as an adsorbent to quickly and efficiently treat printing and dyeing wastewater, which is conducive to ecological balance.