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Metal Ions Binding to Natural Organic Matter Extracted from Wheat Bran: Application of the Surface Complexation Model
Corinne Ravat1, Fanny Monteil-Rivera, Jacques Dumonceau
1GRECI, Chimie de Coordination aux Interfaces, Université de Reims, Reims Cedex 2, 51687, France
Abstract:
Ions binding to solid organic matter was investigated in this study. A simple surface complexation model, the diffuse double-layer model, was used to describe Pb(II), Cd(II), Zn(II), and Ni(II) binding to a lignocellulosic substrate extracted from wheat bran. The lignocellulosic substrate was represented by two acid sites: a low-pH ("carboxylic") site and a high-pH ("phenolic") site, the phenolic-type sites contributing significantly to the binding behavior, even at relatively low pH. By using the previously determined concentrations of sites and acidity constants, the surface complexation model was applied to Pb, Cd, Zn, and Ni binding as a function of pH in a 0.1 M NaNO(3) medium. The model fits were good over a wide range of pH (2