title: Uranium(VI) removal by nanoscale zerovalent iron in anoxic batch systems.
abstract: This study investigated the influences of pH, bicarbonate, and calcium on U(VI) removal and reduction by synthetic nanoscale zerovalent iron (nanoFe(0)) particles under anoxic conditions. The results showed that the rates of U(VI) removal and reduction by nanoFe(0) varied significantly with pH and concentrations of bicarbonate and/or calcium. For instance, at pH 6.92 the pseudo-first-order rate constants of U(VI) removal decreased by 78.5% and 81.3%, and U(VI) reduction decreased by 90.3% and 89.3%, when bicarbonate and calcium concentrations were increased from 0 to 1 mM, respectively. X-ray photoelectron spectroscopy (XPS) analysis confirmed the formation of UO(2) and iron (hydr)oxides as a result of the redox interactions between U(VI) and nanoFe(0). The study demonstrated the potential of using nanoFe(0) for U(VI)-contaminated site remediation and highlighted the impacts of pH, bicarbonate, and calcium on the U(VI) removal and reduction processes.
authors.affiliation: Key Laboratory of Bio-geology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan, Hubei 430074, China.
authors.forename: Sen
authors.initials: S
authors.lastname: Yan
authors.forename: Bin
authors.initials: B
authors.lastname: Hua
authors.forename: Zhengyu
authors.initials: Z
authors.lastname: Bao
authors.forename: John
authors.initials: J
authors.lastname: Yang
authors.forename: Chongxuan
authors.initials: C
authors.lastname: Liu
authors.forename: Baolin
authors.initials: B
authors.lastname: Deng
mesh_terms: D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D053768:Metal Nanoparticles; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D014501:Uranium / Q000302:isolation & purification*
chemical_list: D014501:Uranium; D007501:Iron; D010100:Oxygen