Adsorption of casein onto alkali treated bentonite

The adsorption measurements of casein onto alkali treated bentonite were pe rformed at room temperature and fixed pH (11.8) with an object to study the mode of casein adsorption at the alkali treated bentonite surfaces. The ad sorption isotherm was found to have a Langmuir nature. The adsorption was p H dependent and increased with a decrease in temperature. The adsorption wa s quite sensitive to the presence of Cl-, SO42-, and PO43- ions and showed many interesting variations with increasing concentrations of the added ani ons. Various kinetic and adsorption parameters such as the adsorption coeff icient, rate constants for adsorption and desorption, diffusion constant, a nd penetration rate constant were calculated. (C) 2000 John Wiley & Sons, I nc.