Biomass charcoal composite material with high adsorption performance as well as preparation method and application of biomass charcoal composite material

The invention relates to the technical field of biochar adsorption materials, and particularly provides a high-adsorption-performance biomass charcoal composite material as well as a preparation method and application thereof. The method comprises the following steps: (1) mixing a biomass charcoal source with 10-15wt% of a calcium chloride solution, and adjusting the pH value to 2-3; carrying out hydrothermal reaction under the condition of 160 to 180 DEG C; (2) after the hydrothermal reaction is finished, drying the system, and calcining the dried material to obtain a biochar material; (3) performing low-temperature plasma treatment on the biochar material for 3-5 minutes; and (4) mixing the material obtained in the step (3) with 5-8wt% of a chitosan solution, and drying. The high-adsorbability biomass charcoal composite material prepared by the method provided by the invention has better adsorption capacity on various heavy metals in urban sewage, and does not cause secondary pollution. 本发明涉及生物炭吸附材料技术领域，具体提