Nanosized amine-rich spheres embedded polymeric beads for Cr (VI) removal

Peng Lin; Chao Liu; Jiansheng Li; Junwen Qi; Rui Luo; Xiuyun Sun; Jinyou Shen; Weiqing Han; Lianjun Wang

doi:10.1016/j.jcis.2017.08.064

Nanosized amine-rich spheres embedded polymeric beads for Cr (VI) removal

J Colloid Interface Sci. 2017 Dec 15:508:369-377. doi: 10.1016/j.jcis.2017.08.064. Epub 2017 Aug 20.

Authors

Peng Lin¹, Chao Liu¹, Jiansheng Li², Junwen Qi¹, Rui Luo¹, Xiuyun Sun¹, Jinyou Shen¹, Weiqing Han¹, Lianjun Wang³

Affiliations

¹ Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
² Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. Electronic address: lijsh@mail.njust.edu.cn.
³ Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. Electronic address: wanglj@mail.njust.edu.cn.

PMID: 28843926
DOI: 10.1016/j.jcis.2017.08.064

Abstract

Porous matrix immobilization is considered as an effective approach to address the engineering challenges during practical application of nanoadsorbent. In this work, polyethersulfone (PES) beads with diameter of around 2.5mm, in which nanosized amine-rich polymer spheres (APSs) with particle size of ∼400nm are immobilized, are fabricated via phase inversion route. APSs-PES beads possess asymmetric and hierarchical structure with an exterior porous surface dense layer and numerous inner interpenetrating fingerlike channels, which promote the transportation of molecule and prevent the leaching of nanoadsorbents. The well distributed APSs with nitrogen-containing functional groups provide abundant adsorption sites. The cooperative attributing of the hierarchical structure and APSs demmonstrates enhanced Cr (VI) adsorption efficiency. The adsorption capacity of Cr (VI) is 243.9mg/g at 298K by Langmuir fitting. The effects of pH, temperature, the ratio of adsorbents and coexisting ionic are further studied in detail. The Cr (VI) removal mechanism is further explored by the combination of SEM, XPS, FTIR measurements and the adsorption parameters, further revealing the synergistic contribution of electrostatic attraction and reduction process. Therefore, this kind of adsorbents may show promising prospects on elimination of hazardous Cr (VI) in wastewater treatment.

Keywords: Immobilization; Polyethersulfone; Polymer beads; Removal of chromium.