Fabrication of novel magnetic graphene oxide nanocomposites for selective adsorption of mercury from aqueous solutions
| Autor: | Soleyman Hosseinzadeh, Hossein Hosseinzadeh, Shahryar Pashaei |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Health Toxicology and Mutagenesis Oxide Wastewater 010501 environmental sciences Waste Disposal Fluid 01 natural sciences Nanocomposites Polymerization law.invention Magnetics symbols.namesake chemistry.chemical_compound Adsorption Microscopy Electron Transmission X-Ray Diffraction law Desorption Spectroscopy Fourier Transform Infrared Environmental Chemistry 0105 earth and related environmental sciences Aqueous solution Nanocomposite Graphene Temperature Langmuir adsorption model Oxides Mercury General Medicine Hydrogen-Ion Concentration Pollution Kinetics Chemical engineering chemistry Selective adsorption Microscopy Electron Scanning symbols Graphite Water Pollutants Chemical |
| Zdroj: | Environmental Science and Pollution Research. 26:26807-26821 |
| ISSN: | 1614-7499 0944-1344 |
| Popis: | In this work, a novel functionalized graphene oxide (GO) was used as an effective and selective adsorbent for removal of mercury (Hg2+). The magnetic nanocomposite adsorbent (MNA) based on GO was prepared through surface reversible addition-fragmentation chain transfer copolymerization of acrylic monomers and then the formation of Fe3O4 nanoparticles. The structure of MNAs was characterized by using FTIR, SEM, TEM, VSM, XRD, and nitrogen adsorption/desorption isotherms. The results of ion adsorption of MNAs demonstrated high selectivity and adsorption efficiency for Hg2+ in the presence of competing ions. Furthermore, the removal of Hg2+ obeyed a pseudo-second-order model and fitted well to the Langmuir isotherm model with the maximum Hg2+ uptake of 389 mg g-1. The MNA was also confirmed as good materials for re-use and maintained 86% of its initial adsorption capacity for mercury after the fifth regeneration cycles. Finally, the experimental results demonstrated that the solution pH, ion concentration, and temperature had a major impact on Hg(II) adsorption capacity. The results indicate that the MNAs with high adsorption abilities could be very promising adsorbents for the selective recovery of ions in wastewater treatment process. Graphical abstract. |
| Databáze: | OpenAIRE |
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