The Adsorptive Properties of the D301R Resin Toward Nitrobenzene in Aqueous Solution

The adsorptive properties of the D301R resin towards nitrobenzene in aqueous solution were investigated in details. The adsorption kinetic curves and adsorption isotherm curves were determined at different temperatures. An adsorption kinetic model was proposed. The equilibrium adsorption capacity, the adsorptive activation energy and the adsorption enthalpy were estimated. The experimental results showed that the adsorption kinetics follows a pseudo-second-order equation controlled by a surface process. The rate constant k2 is 3.74×10-2 g/(mg·min) at 300 K, which increases with the increase of temperature. The equilibrium adsorption capacity is 5.02 mg/g at 300 K, which decreases with the increase of temperature. The adsorptive activation energy is 39.02 kJ/mol. The adsorption isotherm is consistent with the Langmuir isotherm and the calculated adsorption enthalpy is about -22.47 kJ/mol. The hydrogen bonding was suggested to be responsible for nitrobenzene adsorption onto D301R resin.