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Microwave-assisted synthesis of reduced graphene oxide decorated with magnetite and gold nanoparticles, and its application to solid-phase extraction of organochlorine pesticides

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Abstract

An agent-free microwave-assisted method was developed for the preparation of a reduced graphene oxide/Fe3O4@gold nanocomposite. This material was used as an adsorbent for magnetic solid-phase extraction of organochlorine pesticides (OCPs) from water samples. The nanocomposite was characterized by transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy. The effects of sample volume, amount of sorbent, eluent volume, extraction and desorption time, and the effect of salt on the extraction efficiency were optimized. The linear response range of GC analysis extends from 0.05 to 500 μg L−1 of OCPs, the limits of detection range from 0.4 to 4.1 ng L−1, relative standard deviations from 1.7 to 7.3 %, and recoveries (from spiked seawater samples) from 69 to 114 %.

Oxygen functional groups in graphene oxide can bind to magnetic Fe3O4 nanoparticles through chemical bonds, and a magnetic reduced graphene oxide (RGO) is thus obtained. The interaction between magnetic RGO and HAuCl4 led to dispersion of the gold nanoparticles on the substrate. π-interaction of RGO and AuNPs with aromatic rings made this sorbent effective for extraction of organochlorine pesticides.

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Authors and Affiliations

  1. Department of Marine Living Science, Ocean Sciences Research Center, Iranian National Institute for Oceanography and Atmospheric Science, Tehran, Iran

    Ali Mehdinia

  2. Department of Chemistry, Payam Noor University, P. O. Box 19395-3697, Tehran, Iran

    Shirin Rouhani & Shahla Mozaffari

Authors
  1. Ali Mehdinia
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  2. Shirin Rouhani
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  3. Shahla Mozaffari
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Correspondence to Ali Mehdinia.

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Mehdinia, A., Rouhani, S. & Mozaffari, S. Microwave-assisted synthesis of reduced graphene oxide decorated with magnetite and gold nanoparticles, and its application to solid-phase extraction of organochlorine pesticides. Microchim Acta 183, 1177–1185 (2016). https://doi.org/10.1007/s00604-015-1691-5

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