title: Efficient capture of strontium from aqueous solutions using graphene oxide-hydroxyapatite nanocomposites.
abstract: Three-dimensional hierarchical flower-like graphene oxide-hydroxyapatite (GO-HAp) nanocomposites were synthesized by a simple biomimetic method in a modified simulated body fluid (mSBF). The obtained GO-HAp nanocomposites were characterized by field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transformed infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and N2 adsorption-desorption analysis. The formation mechanism was proposed and the prepared GO-HAp was applied as an adsorbent to remove strontium from large volumes of aqueous solutions. A maximum adsorption capacity of 702.18 mg g(-1) was achieved on GO-HAp, almost two fold higher than that of bare HAp and nine fold higher than that of GO. The effects of pH, adsorbent content, contact time and Sr(2+) initial concentrations on Sr(2+) removal from solution by GO-HAp were systematically investigated, and the results indicated that the removal of Sr(2+) by GO-HAp was weakly dependent on solution pH. The results herein reveal that the GO-HAp nanocomposites had exceptional potential as a suitable material for preconcentration and solidification of radiostrontium from large volumes of aqueous solutions in nuclear waste management and radiostrontium pollution cleanup.
authors.affiliation: School for Radiological and Interdisciplinary Sciences, Soochow University, Suzhou 215123, P. R. China. xkwang@ipp.ac.cn xkwang@suda.edu.cn.
authors.forename: Tao
authors.initials: T
authors.lastname: Wen
authors.forename: Xilin
authors.initials: X
authors.lastname: Wu
authors.forename: Mancheng
authors.initials: M
authors.lastname: Liu
authors.forename: Zhouhao
authors.initials: Z
authors.lastname: Xing
authors.forename: Xiangke
authors.initials: X
authors.lastname: Wang
authors.forename: An-Wu
authors.initials: AW
authors.lastname: Xu