Kinetics and equilibrium adsorption studies of dimethylamine (DMA) onto ion-exchange resin.
The fine grained resin ZGSPC106 was used to adsorb dimethylamine (DMA) from aqueous solution in the present research. Batch experiments were performed to examine the effects of initial pH of solution and agitation time on the adsorption process. The thermodynamics and kinetics of adsorption were also analyzed. The maximum adsorption was found at natural pH of DMA solution and equilibrium could be attained within 12 min. The equilibrium adsorption data were conformed satisfactorily to the Langmuir equation. The evaluation based on Langmuir isotherm gave the maximal static saturated adsorption capacity of 138.89 mg/g at 293K. Various thermodynamic parameters such as free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) showed that the adsorption was spontaneous, endothermic and feasible. DMA adsorption on ZGSPC106 fitted well to the pseudo-second-order kinetic model. Furthermore, the adsorption mechanism was discussed by Fourier transform infrared spectroscopy (FT-IR) analysis.
Hu
Qinhai
Q
College of Environmental and Resources Science, Zhejiang University, Hangzhou 310029, Zhejiang, China. qhhu@zju.edu.cn
Meng
Yuanyuan
Y
Sun
Tongxi
T
Mahmood
Qaisar
Q
Wu
Donglei
D
Zhu
Jianhang
J
Lu
George
G
D000327:Adsorption; D004123:Dimethylamines / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007475:Ion Exchange Resins; D007700:Kinetics; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics
D004123:Dimethylamines; D007475:Ion Exchange Resins; C034516:dimethylamine