期刊
JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY
卷 50, 期 4, 页码 375-384出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/10601325.2013.768110
关键词
Adsorption; cross-linked polyaminophosphonate; heavy metal ions
A cross-linked polyzwitterionic acid (CPZA) containing aminophosphonic acid motifs was synthesized via cyclocopolymerization of diallylaminomethylphosphonic acid and cross-linker 1,1,4,4-tetraallylpiperazinium dichloride (10mol%) using tert-butylhydroperoxide as the initiator. The CPZA upon treatment with NaOH was converted to a cross-linked anionic polyelectrolyte (CAPE 5). The adsorption of Zn2+ and Cd2+ on CAPE 5 showed that the experimental data fit the Lagergren second-order kinetic model and Langmuir, as well as Freundlich isotherm models. The adsorption capacity of Zn2+ was found to be higher than that of Cd2+, and the adsorption process was spontaneous and endothermic in nature. The low activation energy of 11.3 and 9.3 kJ/mol for Zn2+ and Cd2+, respectively indicated the adsorptions as a favorable process. The resin demonstrated excellent adsorption efficiency in removing the metal ions from aqueous solution.
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