Magnetic biomass charcoal based on Fenton sludge and cellulose as well as preparation method and application of magnetic biomass charcoal

The invention discloses magnetic biomass charcoal based on Fenton sludge and cellulose as well as a preparation method and application of the magnetic biomass charcoal. The preparation method of the magnetic biomass charcoal comprises the following steps: (1) filtering Fenton sludge slurry, collecting filter residues, conducting drying at 100 DEG C to 110 DEG C for 40-50 hours to obtain blocky solids, breaking the blocky solid into pieces, grinding the pieces to a size of larger than or equal to 200 meshes to obtain solid powder, and drying the powder at a temperature of 100 DEG C and 110 DEGC for 10-15 hours to obtain Fenton sludge powder for later use; and (2) putting Fenton sludge powder into a small dry beaker, adding CMC and water, conducting stirring for 1 hour to 3 hours, performing centrifuging, drying and grinding, transferring a grounded mixture into a quartz boat, wrapping the quartz boat with tinfoil, putting the quartz boat into a tube furnace, keeping the quartz boat at300-700 DEG C in a nitroge