Pb(II), Cu(II) and Cd(II) removal through untreated rice husk; thermodynamics and kinetics.

The sorption properties of rice husk towards Cu(II), Cd(II) and Pb(II) were studied. The sorption isotherms are described by the Langmuir equation, and Pb(II) shows a higher affinity for rice husk compared to Cu(II) and Cd(II) under the same conditions. The kinetics of sorption obeys to a pseudo second-order equation for all metals.

Usage of Empore membrane in alcoholic media for copper(II) distribution studies.

The sorption of copper(II) on a solid, iminodiacetic based, chelating material, the Empore membrane, in alcoholic solutions is considered. Determination of the acid-base properties, kinetic of metal sorption and complexing properties, in solutions with different percentages of ethanol, ranging from 0 to 40% is undertaken. The results are compared with those obtained using the classical iminodiacetic resin Chelex 100 in beads.