Adsorption of ponceau 4R from aqueous solutions by polyamidoamine-cyclodextrin crosslinked copolymer

作者：Li Ning^*; Lei Xiao Mei

来源：Journal of Inclusion Phenomena and Macrocyclic Chemistry, 2012, 74(1-4): 167-176.

DOI：10.1007/s10847-011-0096-2

• Cyclodextrin
• Polyamidoamine
• Copolymer
• Adsorption
• Ponceau 4R

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.

• 出版日期2012-12
• 单位重庆工商大学