title: Remediation of Ni(2+)-contaminated water using iron powder and steel manufacturing byproducts.
abstract: Steel manufacturing byproducts and commercial iron powders were tested in the treatment of Ni(2+)-contaminated water. Ni2+ is a priority pollutant of some soils and groundwater. The use of zero-valent iron, which can reduce Ni2+ to its neural form appears to be an alternative approach for the remediation of Ni(2+)-contaminated sites. Our experimental data show that the removal efficiencies of Ni2+ were 95.15% and 94.68% at a metal to solution ratio of 20 g/L for commercial iron powders and the steel manufacturing byproducts in 60 min at room temperature, respectively. The removal efficiency reached 98.20% when the metal to solution ratio was 40 g/L for commercial iron powders. Furthermore, we found that the removal efficiency was also largely affected by other factors such as the pHs of the treated water, the length of time for the metal to be in contact with the Ni(2+)-contaminated water, initial concentrations of metal solutions, particle sizes and the amount of iron powders. Surprisingly, the reaction temperature appeared to have little effect on the removal efficiency. Our study opens the way to further optimize the reaction conditions of in situ remediation of Ni2+ or other heavy metals on contaminated sites.
authors.affiliation: Department of Environment Engineering, Zhejiang University, Hangzhou 310027, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Jin
authors.forename: Wei-Rong
authors.initials: WR
authors.lastname: Zhao
authors.forename: Xin-Hua
authors.initials: XH
authors.lastname: Xu
authors.forename: Zhi-Wei
authors.initials: ZW
authors.lastname: Hao
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu
authors.forename: Ping
authors.initials: P
authors.lastname: He
authors.forename: Mi
authors.initials: M
authors.lastname: Zhou
mesh_terms: D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D008669:Metallurgy; D009532:Nickel / Q000032:analysis / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013232:Steel; D014865:Waste Disposal, Fluid / Q000379:methods*; D014866:Waste Products; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D014866:Waste Products; D014874:Water Pollutants, Chemical; D013232:Steel; D009532:Nickel; D007501:Iron