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• W2104630938 abstract "Dynamic adsorption behavior between Cu2+ ion and water-insoluble amphoteric starch was investigated. The sorption process occurs in two stages: external mass transport occurs in the early stage and intraparticle diffusion occurs in the long-term stage. The diffusion rate of Cu2+ ion in both stages is concentration dependent. In the external mass-transport process, the diffusion coefficient (D1) increases with increasing initial concentration in the low- (1 × 10−3-4 × 10−3M) and high-concentration regions (6 × 10−3-10 × 10−3M). The values of adsorption activation energy (kd1) in the low- and high-concentration regions are 15.46–24.67 and −1.80 to −11.57 kJ/mol, respectively. In the intraparticle diffusion process, the diffusion coefficient (D2) increases with increasing initial concentration in the low-concentration region (1 × 10−3-2 × 10−3M) and decreases with increasing initial concentration in the high-concentration region (4 × 10−3-10 × 10−3M). The kd2 values in the low- and high-concentration regions are 9.96–15.30 and −15.53 to −10.71 kJ/mol, respectively. These results indicate that the diffusion process is endothermic in the low-concentration region and is exothermic in the high-concentration region for both stages. The external mass-transport process is more concentration dependent than the intraparticle diffusion process in the high-concentration region, and the dependence of concentration for both processes is about equal in the low-concentration region. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 2849–2855, 2001" @default.
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• W2104630938 date "2001-01-01" @default.
• W2104630938 modified "2023-10-18" @default.
• W2104630938 title "Dynamic adsorption behaviors between Cu2+ ion and water-insoluble amphoteric starch in aqueous solutions" @default.
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• W2104630938 doi "https://doi.org/10.1002/app.1734" @default.
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