title: Development of multimetal binding model and application to binary metal biosorption onto peat biomass.
abstract: Biosorption of Cr(3+), Cu(2+) and Cd(2+) from binary metal solutions onto peat in the batch systems was investigated at pH 4. The order of maximum uptake was Cr>or=Cu>Cd and maximum uptake levels of ca. 0.4 mmol/g were observed for chromium and copper while cadmium was taken up to a maximum of ca. 0.2 mmol/g. Co-ion competition resulted in up to 70 percent decrease of primary metal uptake. A novel approach to multicomponent sorption modelling involving regression to the total metal taken up was adopted. Two extended Langmuir-type models were found to exhibit good fit to the experimental data. Using the simpler model of these, three-dimensional sorption surfaces were generated which describe the metal uptake as a function of equilibrium concentrations of both metals. These methods allow prediction of metal uptakes over a continuum of concentrations of both metals in binary systems.
authors.affiliation: Department of Chemistry, Dalian University of Technology, 116023, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Ma
authors.forename: J M
authors.initials: JM
authors.lastname: Tobin
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D018533:Biomass; D002104:Cadmium / Q000737:chemistry* / Q000302:isolation & purification*; D002857:Chromium / Q000737:chemistry* / Q000302:isolation & purification*; D003300:Copper / Q000737:chemistry* / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D008962:Models, Theoretical; D012987:Soil; D014865:Waste Disposal, Fluid; D018508:Water Purification / Q000379:methods*
chemical_list: D012987:Soil; D002104:Cadmium; D002857:Chromium; D003300:Copper