Mercury adsorption of modified mulberry twig chars in a simulated flue gas

► Pyrolyzed mulberry twig chars were modified by steam activation and impregnation. ► Steam activation and H2O2-impregnation improve char's pore structure significantly. ► Cl-impregnation increase surface functional groups but deteriorates pore structure. ► Mercury adsorption of Cl-impregnated MT chars increases with increasing Cl content. ► Compare different modification process of MT chars on mercury adsorption.