title: Attenuation of divalent toxic metal ions using natural sericitic pyrophyllite.
abstract: The present study investigated the effectiveness of an inexpensive and ecofriendly alumino silicate clay mineral, sericitic pyrophyllite, as an adsorbent for the possible application in the removal of some divalent toxic metal cations such as Pb(2+), Cu(2+)and Zn(2+) from aqueous systems. Batch scale equilibrium adsorption studies were carried out for a wide range of initial concentration from 24.1 to 2,410 micromol L(-1) for lead, 78.65 to 7,865 micromol L(-1) for copper and 76.45 to 7,645 micromol L(-1) for zinc solutions. The removal of Pb(2+) was almost complete at low concentration (maximum lead removal capacity, LRC, 32 mg of lead/g of pyrophyllite) with 10 g L(-1) of adsorbent in a 30 min equilibration time. The effects of temperature on adsorption of heavy metal ions were studied. The applicability of the Langmuir, Freundlich and Dubinin-Radushkevich adsorption models in each case of lead, copper and zinc adsorption was examined separately at different temperatures. The adsorption process was found to be endothermic and the Freundlich adsorption model was found to represent the data at different temperatures more suitably.
authors.affiliation: Environment Chemistry Division, Advanced Materials and Processes, Research Institute (C.S.I.R.), Hoshangabad Road, Bhopal 462 026, India. prasadmurari56@yahoo.co.in
authors.forename: Murari
authors.initials: M
authors.lastname: Prasad
authors.forename: Sona
authors.initials: S
authors.lastname: Saxena
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry*; D002413:Cations, Divalent / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000737:chemistry*; D012015:Reference Standards
chemical_list: D000538:Aluminum Silicates; D002413:Cations, Divalent; D008670:Metals; C049037:aluminosilicate