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Coating Fe3O4 magnetic nanoparticles with humic acid for high efficient removal of heavy metals in water.
Environ Sci Technol. 2008 Sep 15; 42(18):6949-54.ES

Abstract

Humic acid (HA) coated Fe3O4 nanoparticles (Fe3O4/HA) were developed for the removal of toxic Hg(II), Pb(II), Cd(II), and Cu(II) from water. Fe3O4/HA were prepared by a coprecipitation procedure with cheap and environmentally friendly iron salts and HA. TOC and XPS analysis showed the as-prepared Fe3O4/HA contains approximately 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 Fe3O4/HA (with approximately 10 nm Fe3O4 cores) aggregated in aqueous suspensions to form aggregates with an average hydrodynamic size of approximately 140 nm. With a saturation magnetization of 79.6 emu/g, the Fe3O4/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 Fe3O4/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 Fe3O4/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 (< or = 3.7%) and HA (< or = 5.3%). The Fe3O4/HA was able to remove over 99% of Hg(ll) and Pb(ll) and over 95% of Cu(II) and Cd(II) in natural and tap water at optimized pH. Leaching back of the Fe3O4/HA sorbed heavy metals in water was found to be negligible.

Authors+Show Affiliations

State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18853814

Citation

Liu, Jing-fu, et al. "Coating Fe3O4 Magnetic Nanoparticles With Humic Acid for High Efficient Removal of Heavy Metals in Water." Environmental Science & Technology, vol. 42, no. 18, 2008, pp. 6949-54.
Liu JF, Zhao ZS, Jiang GB. Coating Fe3O4 magnetic nanoparticles with humic acid for high efficient removal of heavy metals in water. Environ Sci Technol. 2008;42(18):6949-54.
Liu, J. F., Zhao, Z. S., & Jiang, G. B. (2008). Coating Fe3O4 magnetic nanoparticles with humic acid for high efficient removal of heavy metals in water. Environmental Science & Technology, 42(18), 6949-54.
Liu JF, Zhao ZS, Jiang GB. Coating Fe3O4 Magnetic Nanoparticles With Humic Acid for High Efficient Removal of Heavy Metals in Water. Environ Sci Technol. 2008 Sep 15;42(18):6949-54. PubMed PMID: 18853814.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Coating Fe3O4 magnetic nanoparticles with humic acid for high efficient removal of heavy metals in water. AU - Liu,Jing-fu, AU - Zhao,Zong-shan, AU - Jiang,Gui-bin, PY - 2008/10/16/pubmed PY - 2009/1/7/medline PY - 2008/10/16/entrez SP - 6949 EP - 54 JF - Environmental science & technology JO - Environ. Sci. Technol. VL - 42 IS - 18 N2 - Humic acid (HA) coated Fe3O4 nanoparticles (Fe3O4/HA) were developed for the removal of toxic Hg(II), Pb(II), Cd(II), and Cu(II) from water. Fe3O4/HA were prepared by a coprecipitation procedure with cheap and environmentally friendly iron salts and HA. TOC and XPS analysis showed the as-prepared Fe3O4/HA contains approximately 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 Fe3O4/HA (with approximately 10 nm Fe3O4 cores) aggregated in aqueous suspensions to form aggregates with an average hydrodynamic size of approximately 140 nm. With a saturation magnetization of 79.6 emu/g, the Fe3O4/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 Fe3O4/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 Fe3O4/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 (< or = 3.7%) and HA (< or = 5.3%). The Fe3O4/HA was able to remove over 99% of Hg(ll) and Pb(ll) and over 95% of Cu(II) and Cd(II) in natural and tap water at optimized pH. Leaching back of the Fe3O4/HA sorbed heavy metals in water was found to be negligible. SN - 0013-936X UR - https://www.unboundmedicine.com/medline/citation/18853814/Coating_Fe3O4_magnetic_nanoparticles_with_humic_acid_for_high_efficient_removal_of_heavy_metals_in_water_ L2 - https://dx.doi.org/10.1021/es800924c DB - PRIME DP - Unbound Medicine ER -