Water-soluble Fe₃O₄superparamagnetic nanocomposites for the removal of low concentration mercury(ii) ions from water

Abstract

We have developed an easy approach to obtain hydrophilic modified MSPNPs (M-MSPNPs) by simply coating monodispersed hydrophobic magnetite (Fe3O4) superparamagnetic nanoparticles (MSPNPs) with functional amphiphilic oligomers. The resulting M-MSPNPs have abundant chelation groups on their surfaces, which could bond with Hg2+and exhibit excellent ability in the fast, efficient and selective removal of Hg2+from water samples by low-field magnetic separation.

Efficient Mercury Removal at Ultralow Metal Concentrations by Cysteine Functionalized Carbon-Coated Magnetite

“…Due to its acute toxicity, the World Health Organization (WHO) and European Union (EU) define permissible limits of total mercury in drinking water as being not greater than 1.0 ppb [8]. Based on literatures, though with its high toxicity, the number of papers reporting Hg(II) removal from water [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] have been found much less than those focused on other heavy metal pollutant such as ions of Cu, Pb, Zn, Cr, or Cd. Scopus-sorbents comparative details of the performance of several sorbents for Hg(II) removal are given, however, they are limited [12,13,24].…”

“…Based on literatures, though with its high toxicity, the number of papers reporting Hg(II) removal from water [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] have been found much less than those focused on other heavy metal pollutant such as ions of Cu, Pb, Zn, Cr, or Cd. Scopus-sorbents comparative details of the performance of several sorbents for Hg(II) removal are given, however, they are limited [12,13,24]. Besides, reports of effective sorbents for the removal of Hg(II) in water at low initial concentrations (≤100 ppb) are scarce [10,[12][13][14][15][16].…”

“…Scopus-sorbents comparative details of the performance of several sorbents for Hg(II) removal are given, however, they are limited [12,13,24]. Besides, reports of effective sorbents for the removal of Hg(II) in water at low initial concentrations (≤100 ppb) are scarce [10,[12][13][14][15][16]. Adsorption of Hg(II) has been found to be less effective at ultralow initial concentrations (≤20 ppb) [10] and is hampered due to the very small difference in Hg(II) concentration in solution relative to that at the sorption sites, resulting in very slow adsorption rates [25,26].…”

An Overview of Surface‐Functionalized Magnetic Nanoparticles: Preparation and Application for Wastewater Treatment

“…Qi et al. obtained monodisperse water‐soluble magnetite nanocomposites (M–MSPNPs) by simply coating hydrophobic magnetic superparamagnetic Fe 3 O 4 nanoparticles with functional amphiphilic oligomers . The resultant M–MSPNPs with abundant groups on their surfaces could interact with Hg 2+ quickly and selectively, and efficiently remove low concentrations of Hg 2+ from water samples.…”

Recent developments on nanomaterials-based optical sensors for Hg2+ detection

“…Ag NPs supported on activated alumina could be used for the removal of Hg 2+ present in the contaminated water at room temperature with high removal ability [127]. Qi et al [128] synthesized water-soluble Fe 3 O 4 superparamagnetic nanocomposites by coating hydrophobic magnetite superparamagnetic nanoparticles with functional amphiphilic oligomers. The obtained Fe 3 O 4 superparamagnetic nanocomposites could efficiently remove low concentrations of Hg 2+ from water samples by low-field magnetic separation.…”