• 文献标题:   Magnetic dithiocarbamate functionalized reduced graphene oxide for the removal of Cu(II), Cd(II), Pb(II), and Hg(II) ions from aqueous solution: Synthesis, adsorption, and regeneration
  • 文献类型:   Article
  • 作  者:   FU W, HUANG ZQ
  • 作者关键词:   dithiocarbamate, magnetic reduce graphene oxide, removal of heavy metal ion
  • 出版物名称:   CHEMOSPHERE
  • ISSN:   0045-6535 EI 1879-1298
  • 通讯作者地址:   Univ Queensland
  • 被引频次:   26
  • DOI:   10.1016/j.chemosphere.2018.06.087
  • 出版年:   2018

▎ 摘  要

In this study, dithiocarbamate(DTC)-modified magnetic reduce graphene oxide (rGO-PDTC/Fe3O4) was synthesized for the removal of heavy metal ions (Cu(II), Cd(II), Pb(II), and Hg(II)) in synthetic waste water. The rGO-PDTC/Fe3O4 nanocomposite was prepared via a novel synthesis route that includes GO bromination, nucleophilic substitution of polyethylenimine (PEI), the reaction with carbon disulphide (CS2) and Fe3O4 nanoparticle loading. The prepared rGO-PDTC/Fe3O4 nanocomposite was characterised by XPS, MR, TEM and XRD, suggesting that DTC functional groups were chemically bonded to rGO surfaces. N-2 adsorption-desorption results revealed that rGO-PDTC/Fe3O4 nanocomposite exhibited high BET surface area (194.8 m(2)/g) and large pore volume (0.33 cm(3)/g) which are crucial to the function of adsorbent. Adsorption experiments showed that rGO-PDTC/Fe3O4 nanocomposite is an excellent adsorbent for heavy metal removal, which exhibits large adsorption capacities, fast kinetics and solid-liquid separation. The pseudo-second-order kinetic model and Langmuir adsorption model were used to unveil the adsorption mechanisms. The maximum adsorption capacities of the Langmuir model were 113.64, 116.28, 147.06, and 181.82 mg/g for Cu(II), Cd(II), Pb(II), and Hg(II) ions, respectively. After adsorption and desorption process, the spent rGO-PDTC/Fe3O4 nanocomposite was easily regenerated via one-step organic reaction. The regenerated rGO-PDTC/Fe3O4 composite exhibited good adsorption capacities for different metals in five adsorption-desorption-regeneration cycles. (C) 2018 Elsevier Ltd. All rights reserved.