Synthesis of magnetic graphene oxide grafted polymaleicamide dendrimer nanohybrids for adsorption of Pb(II) in aqueous solution

Ying-Xia Ma; Ya-Lan Kou; Dan Xing; Peng-Sheng Jin; Wen-Jie Shao; Xin Li; Xue-Yan Du; Pei-Qing La

doi:10.1016/j.jhazmat.2017.07.026

Synthesis of magnetic graphene oxide grafted polymaleicamide dendrimer nanohybrids for adsorption of Pb(II) in aqueous solution

J Hazard Mater. 2017 Oct 15:340:407-416. doi: 10.1016/j.jhazmat.2017.07.026. Epub 2017 Jul 15.

Authors

Ying-Xia Ma¹, Ya-Lan Kou², Dan Xing², Peng-Sheng Jin², Wen-Jie Shao², Xin Li², Xue-Yan Du², Pei-Qing La²

Affiliations

¹ State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Materials Science & Engineering, Lanzhou University of Technology, Lanzhou 730050, China. Electronic address: mayx2011818@163.com.
² State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Materials Science & Engineering, Lanzhou University of Technology, Lanzhou 730050, China.

PMID: 28735184
DOI: 10.1016/j.jhazmat.2017.07.026

Abstract

In this paper, using maleic anhydride and ethylenediamine as functional monomers, graphene oxide (GO) loaded magnetic Fe₃O₄ nanoparticles modified by (3-Aminopropyl) triethoxysilane as support, magnetic graphene oxide grafted polymaleicamide dendrimer (GO/Fe₃O₄-g-PMAAM) nanohybrids were fabricated by divergent method and magnetic separation technology. The obtained samples were characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, elementary analyzer and vibrating sample magnetometer. The effects of PMAAM generations, solution pH, Pb(II) initial concentration, temperature and contact time on the adsorption property of the samples for Pb(II) in aqueous solution were studied. The results demonstrated that nitrogen content and adsorption capacity of the as-synthesized samples with amino terminal groups were all higher than their adjacent generations PMAAM with carboxyl terminal groups. Moreover, with increasing generations of PMAAM grafted on to the GO/Fe₃O₄, the nitrogen content and the adsorption capacity of the samples with the same terminal groups gradually increased. The maximum adsorption capacity of GO/Fe₃O₄-g-G3.0 for Pb(II) was 181.4mgg^-1 at 298K. The rising of temperature was beneficial for the adsorption. The adsorption kinetics had a better agreement with pseudo-second-order equation, and equilibrium data followed the Langmuir model.

Keywords: Adsorption; Fe(3)O(4) nanoparticles; Graphene oxide; Pb(II); Polymaleicamide dendrimer.