The adsorption of the bio-sorbent of the chemically activated sawdust (CASD) with concentrated sulfuric acid 1:1 (w/v) was carried out for studying the removable kinetics of Fe (II) ions from industrial wastewater and the applicability of Langmuir and Freundlich isotherms was tested. The adsorption kinetics of the Fe (II) ions onto the CASD was studied using pseudo-first order, pseudo-second order and second order kinetics equations. Result shows that the optimum pH for Fe (II) adsorption onto the CASD was found to be 4 and the adsorption efficiency was found to be about 99 % and the maximum adsorption capacity was found to be 116 mg/g. These results showed that the CASD may be an attractive alternative for treatment of the industrial wastewater contaminated by Fe (II) ions.