The mechanisms for CTMAB-bentonites to adsorb CBs from water in the adsorption kinetics and thermodynamics view
CTMAB-膨润土从水中吸附氯苯类化合物的机理——吸附动力学与热力学

A batch adsorption study was carried out to investigate the properties, kinetics and thermodynarnics of adsorption process of CBs on CTMAB-bentonites. The adsorption followed pseudo-second-order kinetics with a small energy of activation, which led to large kinetic rate constant and small time to reach adsorption equilibrium. The experimental data yielded excellent fits with Linear isotherm equation, which was resulted from CBs partition into CTMAB-bentonites. With the increase of octanol-water partition coefficients of CBs and the organic carbon contents of CTMAB-bentonites, CBs distribution coefficients increased. The adsorption of CBs was exothermic in nature and was accompanied with an increase in entropy and a decrease in Gibbs energy in the temperature range of 288 - 308 K, which suggested that the adsorption behavior may be dominated by hydrophobic bonding and the spontaneous nature of the interaction without requiring large activation energies of adsorotion.