RESUMEN
Swine manure digestate (SMD) is rich of functional groups. In this work, raw biochar (BC) was prepared from SMD by oxygen-limiting pyrolysis, and HCl-BC, NH3-BC and Mn-BC were obtained by modifying BC with HCl, NH3·H2O and KMnO4. The modified biochar was negatively charged and showed a larger specific surface area and total pore volume, and higher contents of Si-O-Si and O-H bonds and aromatic rings with CO bond. Among them, Mn-BC, was given a new Mn-O group. The adsorption capacities of biochar were determined using a model aqueous solution containing some metals and antibiotics. The adsorption experiment results showed that Mn-BC had a quite good capacity for Cu and Zn removal. And the removal efficiency of As (III), sulfadimidine and tylosin of 83.98%, 83.76%, and 77.34% respectively, was also observed by using Mn-BC. Mn-BC was considered to be a promising material for the adsorption of heavy metals and antibiotics.