Adsorption behaviour of some aromatic amines on pyrolusite and activated carbon and recovery of beta napthylamine from water sample

The adsorption behaviour of Diphenylamine (DPAM), beta napthylamine (beta N AM), alpha napthylamine (alpha NAM) and aniline on pyrolusite and activated carbon has been studied. Pyrolusite shows remarkable sorption capacity for DPAM and beta NAM as compared to aniline; (the adsorption followed the ord er: Activated Carbon: --> DPAM = beta NAM > alpha Aniline Pyrolusite: DPAM: --> beta NAM > alpha NAM > Aniline) The maximum adsorption of beta NAM occurred in the concentration range 4-20 mug mL(-1) on pyrolusite (95%) and 4-50 mug mL(-1) on activated carbon (10 0%). The effect of various doses of activated carbon on the adsorption of b eta NAM confirm Langmuir and Freundlich isotherms where as Freundlich isoth erm is obeyed by pyrolusite. The adsorption of beta NAM on both the absorbe nts is not affected in presence of DPAM over a wide range of their initial concentrations (20-60 mug mL(-1)). The desorption studies of beta NAM on py rolusite was carried out by batch as well as column processes. Excellent re sults were obtained when a mixture of n-hexane and isopropanol (91:1) was u sed as eluent.