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Adsorption of Zn2+ and Cu2+ onto sulphate and phosphate-modified bentonite
Authors:Bamidele I. Olu-Owolabi  Emmanuel I. Unuabonah
Affiliation:1. Department of Chemistry, University of Ibadan, Ibadan, Nigeria;2. Department of Chemical Sciences, Redeemer''s University, Km 46, Lagos, Ibadan Expressway, PMB 3005, Redemption City, Mowe, Nigeria;1. School of Chemical Engineering, National Technical University of Athens, Zographou Campus, GR-15773 Athens, Greece;2. Department of Biotechnology, University of Verona, Strada Le Grazie 15, I-37134 Verona, Italy;1. Chemistry Department, Faculty of Science, Helwan University, 11795, Helwan, Cairo, Egypt;2. Helwan Nanotechnology Center, Helwan University, 11795, Helwan, Cairo, Egypt;3. Egyptian Petroleum Research Institute, 11727, Cairo, Egypt;4. Nuclear Materials Authority, 6530 P.O Box Maadi, Cairo, Egypt;1. Glenn T. Seaborg Institute, Physical & Life Sciences, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, USA;2. Department of Earth Science, University of California, Santa Barbara, CA 93106, USA;3. University Relations and Science Education, Lawrence Livermore National Laboratory, CA, USA
Abstract:The modification of bentonite with sulphate and phosphate increased the cation exchange capacity (CEC) and adsorption of Cu2+ and Zn2+ but decreased the specific surface area (SSA). Phosphate modified bentonite had the highest adsorption capacity for both metal ions. The Fourier transformed infrared spectra indicated the bonding of sulphate and phosphate bentonite with sulphate and phosphate by the hypochromic and hyperchromic shifts are typical of physisorption and chemisorption mechanisms. Phosphate and sulphate were adsorbed through inner-sphere and outer-sphere complex formation. The isotherms were better fitted by the Langmuir model than the Freundlich model.
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