4.8 Article

One-Pot Synthesis of Magnetic Graphene Nanocomposites Decorated with Core@Double-shell Nanoparticles for Fast Chromium Removal

期刊

ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 46, 期 2, 页码 977-985

出版社

AMER CHEMICAL SOC
DOI: 10.1021/es2014133

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资金

  1. NSF- National Science Foundation-Chemical and Biological Separation under the EAGER [CBET 11-37441]
  2. National Science Foundation-Nanoscale Interdisciplinary Research Team and Materials Processing and Manufacturing [CMMI 10-30755]
  3. NSF [DMR 10-05764]
  4. Welch Foundation [V-0004]
  5. Div Of Chem, Bioeng, Env, & Transp Sys
  6. Directorate For Engineering [1137441, GRANTS:13818629] Funding Source: National Science Foundation
  7. Div Of Civil, Mechanical, & Manufact Inn
  8. Directorate For Engineering [1030755, GRANTS:13940814] Funding Source: National Science Foundation

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A facile thermodecomposition process to synthesize magnetic graphene nanocomposites (MGNCs) is reported. High-resolution transmission electron microscopy and energy filtered elemental mapping revealed a core@double-shell structure of the nanoparticles with crystalline iron as the core, iron oxide as the inner shell and amorphous Si-S-O compound as the outer shell. The MGNCs demonstrate an extremely fast Cr(VI) removal from the wastewater with a high removal efficiency and with an almost complete removal of Cr(VI) within 5 min. The adsorption kinetics follows the pseudo-second-order model and the novel MGNC adsorbent exhibits better Cr(VI) removal efficiency in solutions with low pH. The large saturation magnetization (96.3 emu/g) of the synthesized nanoparticles allows fast separation of the MGNCs from liquid suspension. By using a permanent magnet, the recycling process of both the MGNC adsorbents and the adsorbed Cr(VI) is more energetically and economically sustainable. The significantly reduced treatment time required to remove the Cr(VI) and the applicability in treating the solutions with low pH make MGNCs promising for the efficient removal of heavy metals from the wastewater.

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