Rapid and highly selective removal of lead in simulated wastewater of rare-earth industry using diglycolamic-acid functionalized magnetic chitosan adsorbents

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) 2018, 59(0), , pp.416-424
• Main Authors: Bai, Ruixi, Zhang, Yang, Zhao, Zhigang, Liao, Qiuxia, Chen, Peng, Zhao, Panpan, Guo, Wanghuan, Yang, Fan, Li, Laichao
• Format: Article
• Language: English
• Subjects: Diglycolamic-acid; Fast removal; High selectivity; Lead; Magnetic chitosan beads; 화학공학
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2017.10.053

[Display omitted] •Diglycolamic acid functionalized magnetic chitosan adsorbents with high selectivity for Pb2+ were prepared.•The magnetic adsorbents can achieve rapid solid–liquid separation under the external magnetic field.•The removal of Pb2+ from rare earth leach liquor satisfied the national standards.•The adsorption equilibrium of our adsorbents for Pb2+ can be realized quickly within 30s. Rapid and highly selective magnetic core–shell adsorbents for Pb2+ removal from simulated wastewater of rare-earth industry were prepared by synthesizing chitosan-coated Fe3O4 (Fe@CS) beads and following chemical-grafting steps for the diglycolamic-acid group (DGA). The adsorbents had a highly selective ability for Pb2+ toward other metal ions, which attributed to the superior infinity between the DGA and Pb2+. The maximum adsorption capacity of Pb2+ was 70.57mg/g. The R2 of the pseudo-second order kinetics was 0.99857, which indicated the adsorption process was controlled by chemical reactions. Moreover, diglycolamic-acid functionalized Fe@CS (Fe@CS-DGA) beads separated from water within 9s under magnetic fields.