title: Chelating capture and magnetic removal of non-magnetic heavy metal substances from soil.
abstract: A soil remediation method based on magnetic beneficiation is reported. A new magnetic solid chelator powder, FS@IDA (core-shell Fe3O4@SiO2 nanoparticles coated with iminodiacetic acid chelators), was used as a reactive magnetic carrier to selectively capture non-magnetic heavy metals in soil by chelation and removal by magnetic separation. FS@IDA was prepared via inorganic-organic and organic synthesis reactions that generated chelating groups on the surface of magnetic, multi-core, core-shell Fe3O4@SiO2 (FS) nanoparticles. These reactions used a silane coupling agent and sodium chloroacetate. The results show that FS@IDA could chelate the heavy metal component of Cd, Zn, Pb, Cu and Ni carbonates, lead sulfate and lead chloride in water-insoluble salt systems. The resulting FS@IDA-Cd and FS@IDA-Pb chelates could be magnetically separated, resulting in removal rates of approximately 84.9% and 72.2% for Cd and Pb, respectively. FS@IDA could not remove the residual heavy metals and those bound to organic matter in the soil. FS@IDA did not significantly alter the chemical composition of the soil, and it allowed for fast chelating capture, simple magnetic separation and facilitated heavy metal elution. FS@IDA could also be easily prepared and reprocessed.
authors.affiliation: Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), Wuhan, Hubei 430074.
authors.forename: Liren
authors.initials: L
authors.lastname: Fan
authors.affiliation: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081.
authors.forename: Jiqing
authors.initials: J
authors.lastname: Song
authors.affiliation: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081.
authors.forename: Wenbo
authors.initials: W
authors.lastname: Bai
authors.affiliation: Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), Wuhan, Hubei 430074.
authors.forename: Shengping
authors.initials: S
authors.lastname: Wang
authors.affiliation: Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), Wuhan, Hubei 430074.
authors.forename: Ming
authors.initials: M
authors.lastname: Zeng
authors.affiliation: Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), Wuhan, Hubei 430074.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Li
authors.affiliation: Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), Wuhan, Hubei 430074.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), Wuhan, Hubei 430074.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Li
authors.affiliation: Hunan Modern Environment Technology Co., Ltd, Changsha, Hunan.
authors.forename: Haiwei
authors.initials: H
authors.lastname: Lu
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000737:chemistry; D002412:Cations; D002614:Chelating Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000737:chemistry; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*; D012995:Solubility
chemical_list: D002412:Cations; D002614:Chelating Agents; D058185:Magnetite Nanoparticles; D019216:Metals, Heavy; D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium; D007854:Lead