Abstract
Batch adsorption experiments were carried out for the removal of ponceau 4R (P4R, C.I. 16255) from aqueous solutions using a novel polyamidoamine–cyclodextrin crosslinked copolymer (PAMAM-CD). The influence of several operating variables, such as contact time, initial concentration, pH, ionic strength, was investigated. Results showed that PAMAM-CD exhibited very high adsorption capacity toward P4R. The adsorption capacity of P4R was even up to 254.3 mg/g when the initial concentration of P4R solution was 340 mg/L at 288 K. The maximum adsorption capacity occured at below pH 5. The adsorption rate was fast and over 52% of the equilibrium adsorption value occurred in the first 15 min at 308 K. Adorption kinetics followed the Ho and McKay equation. Intraparticle diffusion was involved in the adsorption process but it is not the only rate-controlling step. Equilibrium isotherm data were precisely fitted by the Langmuir model. The negative values of Gibbs free energy change indicated the spontaneous nature of adsorption. The PAMAM-CD was easily recovered by 2 M HCl as washing solvent and it could be used as a promising alternative adsorbent.
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Acknowledgment
This work was supported by the National Natural Science Foundation of China (No. 20907076), the Key Research Project for Discipline Construction of Chongqing Technology & Business University (No. 1152006), and the Program for Innovation Team Building in University (Chongqing Municipal Education Commission of China. No. KJTD201020).
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Li, N., Lei, XM. Adsorption of ponceau 4R from aqueous solutions by polyamidoamine–cyclodextrin crosslinked copolymer. J Incl Phenom Macrocycl Chem 74, 167–176 (2012). https://doi.org/10.1007/s10847-011-0096-2
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DOI: https://doi.org/10.1007/s10847-011-0096-2