Polyaniline nanofibers assembled on alginate microsphere for Cu²⁺ and Pb²⁺ uptake

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• 作者：Nina Jiang ; Yiting Xu ; Yuqiong Dai ; Weiang Luo ; Lizong Dai ; ^{lzdai@xmu.edu.cn}
• 关键词：Polyaniline nanofibers ; Calcium alginate ; Adsorption ; Pb2+ ; Cu2+
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：15 May, 2012
• 卷：215-216
• 期：Complete
• 页码：17-24
• 文件大小：1083 K

摘要

Polyaniline (PANI) nanofibers were assembled on the micro- or millimeter-scale calcium alginate (CA) beads by 鈥渃ompetitive adsorption-restricted polymerization鈥?approach. The CA beads made the dimensional expansion of PANI nanofibers evident, which overcame the serious aggregation of PANI nanofibers and benefited the practical operation of PANI nanofibers. Batch adsorption results showed that the millimeter-scale CA beads decorated by PANI nanofibers had high affinity to Cu²⁺ and Pb²⁺ in aqueous solutions. The removal percentages of Cu²⁺ and Pb²⁺ in aqueous solutions by this PANI/CA composite with milli/nano hierarchical structure surpassed 90%in a wide pH range from 3 to 7. Sorption of the two kinds of ions to PANI/CA composite sorbent agreed well with the Freundlich adsorption model. The adsorption kinetic results of Cu²⁺ and Pb²⁺ showed that the adsorption reached equilibrium within 120 min and 40 min, respectively. And their adsorption rates could be described by pseudo-second-order kinetics. The desorption percentages of Pb²⁺ and Cu²⁺ from this PANI/CA composite are 62%and 75%, respectively. The Pb²⁺ and Cu²⁺ removal capacity of the sorbent could be further reinforced when the diameter of CA beads turned from millimeter to micrometer.