Enhanced fluoride uptake by bimetallic hydroxides anchored in cotton cellulose/graphene oxide composites

Yanan Shang; Zihang Wang; Xing Xu; Chen Cheng; Baoyu Gao; Qinyan Yue; Shiqing Liu; Cong Han

doi:10.1016/j.jhazmat.2019.05.039

Enhanced fluoride uptake by bimetallic hydroxides anchored in cotton cellulose/graphene oxide composites

J Hazard Mater. 2019 Aug 15:376:91-101. doi: 10.1016/j.jhazmat.2019.05.039. Epub 2019 May 16.

Authors

Yanan Shang¹, Zihang Wang¹, Xing Xu², Chen Cheng¹, Baoyu Gao¹, Qinyan Yue¹, Shiqing Liu³, Cong Han³

Affiliations

¹ Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
² Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China. Electronic address: xuxing@sdu.edu.cn.
³ Office of Pollution Emission Control, Binzhou City, PR China.

PMID: 31125943
DOI: 10.1016/j.jhazmat.2019.05.039

Abstract

A novel hybrid nanomaterial was synthesized by embedding the bimetallic Zr and La (hydro)xides onto the cotton cellulose/graphene oxide composites (CC/GO composites), forming the Zr-La-CC/GO nanocomposites. Selective uptake of fluoride onto the Zr-La /GO hybrids in multiple competitive environments were evaluated. Morphological characteristics of Zr-La-CC/GO nanocomposites reflected the well distributions of embedded Zr and La hydroxides in the nanocomposites. Results also indicated that the encapsulated bimetallic hydroxides in Zr-La-CC/GO hybrids exhibited extremely high fluoride adsorption capacity and stability. XPS investigation exhibited the strong ZrF and LaF bonds in spent Zr-La-CC/GO nanocomposites, and the bonds were weakened at higher pH, which was consistent with the adsorption results. In addition, CC/GO composites using as the host could also exert the strong shielding effect to improve the stability of embedded La and Zr species so as only a low La dissolution (<4.2%) and almost no Zr leaching (0.1%) were observed in high HA concentration. What's more, the Zr-La-CC/GO nanocomposites have also shown great potential application for defluoridation in field.

Keywords: Defluoridation; Humic acid; Hybrid adsorbent; La hydroxides; Zr hydroxides.

Publication types

Research Support, Non-U.S. Gov't