title: Effects of brining on the corrosion of ZVI and its subsequent As(III/V) and Se(IV/VI) removal from water.
abstract: Zero-valent iron (ZVI) has been extensively applied in water remediation, and most of the ZVI materials employed in practical applications are iron scraps, which have usually been corroded to certain extent under different conditions. In this study, the effects of brining with six solutions (NaCl, Na2SO4, NaHCO3, Na2SiO3, NH4Cl, and NaH2PO4) on the corrosion of ZVI and its performance in the removal of As(III/V)/Se(IV/VI) were systematically investigated. All the studied solutions enhanced the corrosion of ZVI except for Na2SiO3, and the degrees of corrosion followed the order of NH4Cl > NaH2PO4> Na2SO4> NaCl > NaHCO3> H2O > Na2SiO3. The corrosion products derived from ZVI were identified by SEM and XRD, and the dominant corrosion products varied with the type of brine solution. The positive correlation between the degree of ZVI corrosion and As(III/V)/Se(IV/VI) removal by the pre-corroded ZVI (pcZVI) was verified. In addition, As and Se removal by pcZVI was realized via a comprehensive process including adsorption and reduction, as further supported by the XPS analysis. We believe this study will shed new light upon the selection of iron materials pre-corroded under different saline conditions for practical water remediation.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Shan
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China. Electronic address: bcpan@nju.edu.cn.
authors.forename: Bingcai
authors.initials: B
authors.lastname: Pan
mesh_terms: D000327:Adsorption; D001152:Arsenicals / Q000032:analysis*; D003343:Corrosion; D007501:Iron / Q000737:chemistry*; D012492:Salts / Q000737:chemistry; D018036:Selenium Compounds / Q000032:analysis*; D017670:Sodium Compounds / Q000737:chemistry*; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D001152:Arsenicals; D012492:Salts; D018036:Selenium Compounds; D017670:Sodium Compounds; D014874:Water Pollutants, Chemical; D007501:Iron
keywords: Arsenic; Brine solution; Pre-corrosion; Selenium; Zero-valent iron (ZVI)