Separation Science and Technology, Vol.37, No.5, 1123-1134, 2002
Removal of beryllium from aqueous solutions by zeolite 4A and bentonite
The adsorption and desorption of beryllium on zeolite 4A and bentonite has been studied using batch sorption studies. Parameters such as time of equilibrium, effect of pH, and effect of adsorbent dose on adsorption were studied. The adsorbents exhibited good sorption potentials for beryllium with a peak value at pH 5.0. The adsorption followed the Freundlich and Langmuir adsorption models. About 75% and more removal occurred within 20 min, and an equilibrium was attained at around 90 min for both adsorbents. Beryllium adsorption by zeolite 4A is higher than zeolite 13X and bentonite. The desorption studies were carried out using sodium chloride solution, and the effect of NaCl concentration on desorption was studied. Maximum desorption of 87% occurred with 10% NaCl.