Kinetic Process of Purple Cabbage Pigment on Macro Porous Absorbent Resin
The adsorption kinetics of purple cabbage pigment (PCP) on LSA-21 macro porous adsorbent resin were studied at different adsorbent resin concentrations (1, 2, 4, 8 g adsorbent resin per liter of purple cabbage extraction solution) for the temperature range of 20~50°C. The results showed that the adsorption of PCP in purple cabbage extraction solution onto LSA-21 macro porous adsorbent resin is highly in agreement with both Langmuir and Freundlich models. Heat of adsorption (ΔH) value of 11.976 kJ/mol indicates the endothermic adsorption process. A decrease of Gibbs free energy (ΔG) with temperature increase also indicates the spontaneous nature of the process.
Zhong Cao, Yinghe He, Lixian Sun and Xueqiang Cao
J. H. Yi et al., "Kinetic Process of Purple Cabbage Pigment on Macro Porous Absorbent Resin", Advanced Materials Research, Vols. 236-238, pp. 1987-1990, 2011