Isotherm sorption of Cd2+, Co2+, and Ni2+ onto high-yield kraft fibers.
The sorption capacity of high-yield kraft fibers for Cd2+, Co2+, and Ni2+ increased with pH and concentration of the cations in the liquid phase. Within the concentration range for the experiments, which was less than 2 mM, the experimental results fitted the Langmuir, Freundlich, and Sips models with regression coefficient greater than 0.97. Of the three cations investigated, Ni2+ had the highest sorption affinity, followed by Cd2+ and Co2+. The effect of the hydrated radius on the sorption affinity was discussed. Thermodynamically, the sorption was spontaneous and exothermic in the temperature range 283-308 K.
Duong
Tuan D
TD
Australian Pulp and Paper Institute, Department of Chemical Engineering, Monash University, Clayton, Victoria, 3800, Australia.
Nguyen
Kien L
KL
Hoang
Manh
M