Citrate-coated gold nanoparticles as smart scavengers for mercury(II) removal from polluted waters

Isaac Ojea-Jiménez, Xicoténcatl López, Jordi Arbiol, Victor Puntes

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114 Citations (Scopus)

Abstract

Colloidal gold nanoparticles (Au NPs) have been employed as single entities for rapid scanning and sequestration of Hg(II) from multicomponent aqueous solutions containing low pollutant concentrations. Under the studied conditions, sodium citrate has been identified as the reducing agent and Au NPs as the catalyst in the reduction of Hg(II), which is efficiently trapped in the presence of other cations such as Cu(II) and Fe(III). The effect of Hg(II) uptake implies amalgam formation, which leads to remarkable morphological transformations. The hydrophobicity of the resulting amalgam and consequent expulsion from water eases its recovery. The interaction between Au and Hg has been studied using UV-vis, ICP-MS, (S)TEM, SEM, EDX, and XRD. © 2012 American Chemical Society.
Original languageEnglish
Pages (from-to)2253-2260
JournalACS Nano
Volume6
Issue number3
DOIs
Publication statusPublished - 27 Mar 2012

Keywords

  • amalgam
  • catalysis
  • citrate reducer
  • gold nanoparticles
  • mercury removal
  • wastewater

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