Single-step fabrication of recyclable microporous hyperbranched polyethyleneimine adsorbent with highly efficient and selective removal of lead ions. (26th June 2019)

• Record Type: Journal Article
• Authors: Chen, Jie; Liu, Xu; Wang, Shi; Wang, Ailian; Wang, Zhinan; Zeng, Qinghui; Li, Zengxi; Zhang, Liaoyun
• Is Part Of: Polymer. Volume 175(2019)
• Page Start: 71
• Page End: 80
• Publication Date: 2019-06-26
• Subjects: Hyperbranched polyethylenimine -- Crosslinking structure -- Adsorption capacity -- Selectivity -- Recyclability; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2019.04.068
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: A novel recyclable hyperbranched adsorbent for selective adsorption of Pb 2+ ions is fabricated by a facile single-step crosslinking reaction. The as-synthesized adsorbent has porous structure and large of amino groups which beneficial for the removal of Pb 2+ ions in aqueous solution and the removal efficiency is 99.2%. The result also indicates that adsorption ability of the obtained adsorbent increased with the increase of pH from 1 to 6 and temperature from 278 K to 308 K, respectively. The adsorption process of Pb 2+ ions onto PPEI-2-AG followed the Langmuir isotherm model, and a kinetic study indicates that the process fitted pseudo-second order model well. The removal of Pb 2+ ions by PPEI-2-AG is mainly controlled by the specific interactions between Pb 2+ ions and amino functional groups, which could be further confirmed by X-ray photoelectron spectroscopy (XPS). The results demonstrate that PPEI-2-AG holds high potential in environmental remediation. Graphical abstract: Image 1 Highlights: A porous hyperbranched adsorbent has been prepared by single-step crosslinking method. The removal efficiency of Pb 2+ ions onto adsorbent can reach 99.2%. The obtained adsorbent shows a adsorption capacity of 252.4 mg/g for Pb 2+ in aqueous solution. Regeneration experiments show that the removal capacity remains above 88%within eight cycles.