title: Stabilized chitosan/Fe(0)-nanoparticle beads to remove heavy metals from polluted sediments.
abstract: Sediment contamination by heavy metals has become a widespread problem that can affect the normal behaviors of rivers and lakes. After chitosan/Fe(0)-nanoparticles (CS-NZVI) beads were cross-linked with glutaraldehyde (GLA), their mechanical strength, stability and separation efficiency from the sediment were obviously improved. Moreover, the average aperture size of GLA-CS-NZVI beads was 20.6 μm and NZVI particles were nearly spherical in shape with a mean diameter of 40.2 nm. In addition, the pH showed an insignificant effect on the removal rates from the sediment. Due to the dissolution of metals species into aqueous solutions as an introduction of the salt, the removal rates of all heavy metals from the sediment were increased with an increase of the salinity. The competitive adsorption of heavy metals between the sediment particles and GLA-CS-NZVI beads became stronger as the sediment particles became smaller, leading to decreased removal rates. Therefore, the removal efficiency could be enhanced by optimizing experimental conditions and choosing appropriate materials for the target contaminants.
authors.affiliation: Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin 300387, China E-mail: wangzhongliang@vip.skleg.cn.
authors.forename: T
authors.initials: T
authors.lastname: Liu
authors.affiliation: Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin 300387, China E-mail: wangzhongliang@vip.skleg.cn.
authors.forename: Y
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin 300387, China E-mail: wangzhongliang@vip.skleg.cn; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China.
authors.forename: Z L
authors.initials: ZL
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D004787:Environmental Pollution; D019015:Geologic Sediments / Q000737:chemistry*; D015386:Hazardous Substances; D007501:Iron / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry*; D045483:Rivers; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D015386:Hazardous Substances; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D048271:Chitosan; D007501:Iron