▎ 摘　　要

NOVELTY - Graphene-type biochar-structure supported with nano-zero-valent iron complex material, obtained by (1) dispersing the grinded and dried biomass in a mixed solution of oxidant and weak acid, stirring uniformly and performing hydrothermal treatment, collecting and grinding the hydrothermally treated biomass to obtain hydrothermally activated biomass, (2) heating the hydrothermally activated biomass to 500-1100 degrees C under gas protection, maintaining for 2-6 hours to obtain graphene-type biochar, (3) adding the graphene-type biochar to the ferrous sulfate heptahydrate solution, stirring for a while to make it mixed uniformly, adding sodium borohydride solution, reducing ferrous ion to ferrous oxide, performing the whole process under the protection of nitrogen, and (4) collecting the precipitate prepared by the reaction in step (3), washing with absolute ethanol, and drying to obtain the graphene- type biochar-structure supported with nano-zero-valent iron complex material, is claimed. USE - The complex material is useful for removing cadmium and/or arsenic from irrigation water (claimed). ADVANTAGE - The method: adopts biomass through simple chemical hydrothermal reaction and anaerobic high-temperature pyrolysis; synthesizes the graphene biochar structure supported with nano-zero-valent iron complex material; can simultaneously and efficiently remove cadmium and arsenic complex pollution; and is conducive for repairing cadmium and arsenic compound pollution in agricultural irrigation water. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for efficiently and simultaneously removing cadmium and arsenic complex pollutants in irrigation water comprising adding the graphene-type biochar structure supported with nano-zero-valent iron complex material to a water body to be treated, and carrying out adsorption reaction for a period of time.