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Coating FeO magnetic nanoparticles with humic acid for high efficient removal of heavy metals in water

Environmental Science and Technology, ISSN: 0013-936X, Vol: 42, Issue: 18, Page: 6949-6954
2008
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  • Citations
    1,051
  • Captures
    696
  • Social Media
    46
    • Shares, Likes & Comments
      46
      • Facebook
        46

Article Description

Humic acid (HA) coated FeO nanoparticles (Fe O/HA) were developed for the removal of toxic Hg(II), Pb(II), Cd(II), and Cu(II) from water. FeO/HA were prepared by a coprecipitation procedure with cheap and environmentally friendly iron salts and HA. TOC and XPS analysis showed the as-prepared Fe O/ HA contains ∼11% (w/w) of HA which are fractions abundant in O and N-based functional groups. TEM images and laser particle size analysis revealed the FeO/HA (with ∼10 nm Fe O cores) aggregated in aqueous suspensions to form aggregates with an average hydrodynamic size of ∼140 nm. With a saturation magnetization of 79.6 emu/g, the FeO/HA can be simply recovered from water with magnetic separations at low magnetic field gradients within a few minutes. Sorption of the heavy metals to FeO /HA reached equilibrium in less than 15 min, and agreed well to the Langmuir adsorption model with maximum adsorption capacities from 46.3 to 97.7 mg/g. The FeO/HA was stable in tap water, natural waters, and acidic/ basic solutions ranging from 0.1 M HCl to 2 M NaOH with low leaching of Fe (≤3.7%) and HA (≤5.3%). The FeO/HA was able to remove over 99% of Hg(II) and Pb(II) and over 95% of Cu(II) and Cd(II) in natural and tap water at optimized pH. Leaching back of the Fe O/HA sorbed heavy metals in water was found to be negligible. © 2008 American Chemical Society.

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