Fabrication of hierarchical core-shell polydopamine@MgAl-LDHs composites for the efficient enrichment of radionuclides

• Published in: Applied surface science Vol. 396; pp. 1726 - 1735
• Main Authors: Zhu, Kairuo, Lu, Songhua, Gao, Yang, Zhang, Rui, Tan, Xiaoli, Chen, Changlun
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 28.02.2017
• Subjects: Eu(III); MgAl-layered double hydroxides; Polydopamine; Sorption; U(VI); Sorption; Polydopamine; U(VI); Eu(III); MgAl-layered double hydroxides
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2016.11.230

[Display omitted] Synthesis of PDA@MgAl-LDHs and its application for radionuclide removal •Novel hierarchical core/shell structured PDA@MgAl-LDHs were prepared.•PDA@MgAl-LDHs exhibited higher sorption ability for U(VI) and Eu(III).•PDA@MgAl-LDHs were promising materials for the enrichment of radionuclides. Novel hierarchical core/shell structured polydopamine@MgAl-layered double hydroxides (PDA@MgAl-LDHs) composites involving MgAl-layered double hydroxide shells and PDA cores were fabricated thought one-pot coprecipitation assembly and methodically characterized by X-ray diffraction, Fourier transformed infrared spectroscopy, scanning/transmission electron microscopy, selected area electron diffraction, elemental mapping, thermogravimetric analysis and X-ray photoelectron spectroscopy technologies. U(VI) and Eu(III) sorption experiments showed that the PDA@MgAl-LDHs exhibited higher sorption ability with a maximum sorption capacity of 142.86 and 76.02mg/g at 298K and pH 4.5, respectively. More importantly, according to XPS analyses, U(VI) and Eu(III) were sorbed on PDA@MgAl-LDHs via oxygen-containing functional groups, and the chemical affinity of U(VI) by oxygen-containing functional groups is higher than that of Eu(III). These observations show great expectations in the enrichment of radionuclides from aquatic environments by PDA@MgAl-LDHs.