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Coating Fe3O4 magnetic nanoparticles with humic acid for high efficient removal of heavy metals in water
Liu, Jing-Fu; Zhao, Zong-Shan; Jiang, Gui-Bin
2008-09-15
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume42Issue:18Pages:6949-6954
AbstractHumic acid (HA) coated Fe3O4 nanciparticles (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 similar to 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 similar to 10 nm Fe3O4 cores) aggregated in aqueous suspensions to form aggregates with an average hydrodynamic size of similar to 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 (<= 3.7%) and HA (<= 5.3%). The Fe3O4/HA was able to remove over 99% of Hg(II) and Pb(II) and over 95% of COO 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.
Department环境化学与生态毒理学国家重点实验室
WOS IDWOS:000259139400031
Citation statistics
Cited Times:605[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/21919
Collection环境化学与生态毒理学国家重点实验室
Recommended Citation
GB/T 7714
Liu, Jing-Fu,Zhao, Zong-Shan,Jiang, Gui-Bin. Coating Fe3O4 magnetic nanoparticles with humic acid for high efficient removal of heavy metals in water[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2008,42(18):6949-6954.
APA Liu, Jing-Fu,Zhao, Zong-Shan,&Jiang, Gui-Bin.(2008).Coating Fe3O4 magnetic nanoparticles with humic acid for high efficient removal of heavy metals in water.ENVIRONMENTAL SCIENCE & TECHNOLOGY,42(18),6949-6954.
MLA Liu, Jing-Fu,et al."Coating Fe3O4 magnetic nanoparticles with humic acid for high efficient removal of heavy metals in water".ENVIRONMENTAL SCIENCE & TECHNOLOGY 42.18(2008):6949-6954.
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