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 NAM), 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 order: 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 microg mL(-1) on pyrolusite (95%) and 4-50 microg mL(-1) on activated carbon (100%). The effect of various doses of activated carbon on the adsorption of beta NAM confirm Langmuir and Freundlich isotherms where as Freundlich isotherm is obeyed by pyrolusite. The adsorption of beta NAM on both the absorbents is not affected in presence of DPAM over a wide range of their initial concentrations (20-60 microg mL(-1)). The desorption studies of beta NAM on pyrolusite was carried out by batch as well as column processes. Excellent results were obtained when a mixture of n-hexane and isopropanol (91:1) was used as eluent.