Yang Zhe, Xu Hui, Shan Chao, Jiang Zhao, Pan Bingcai
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
Chemosphere. 2017 Mar;170:251-259. doi: 10.1016/j.chemosphere.2016.12.029. Epub 2016 Dec 8.
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, NaSO, NaHCO, NaSiO, NHCl, and NaHPO) 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 NaSiO, and the degrees of corrosion followed the order of NHCl > NaHPO > NaSO > NaCl > NaHCO > HO > NaSiO. 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.
零价铁（ZVI）已广泛应用于水修复领域，实际应用中使用的大多数ZVI材料是铁屑，在不同条件下它们通常已被腐蚀到一定程度。在本研究中，系统地研究了用六种溶液（NaCl、NaSO、NaHCO、NaSiO、NHCl和NaHPO）进行盐渍处理对ZVI腐蚀及其去除As(III/V)/Se(IV/VI)性能的影响。除NaSiO外，所有研究的溶液均增强了ZVI的腐蚀，腐蚀程度顺序为NHCl > NaHPO > NaSO > NaCl > NaHCO > HO > NaSiO。通过扫描电子显微镜（SEM）和X射线衍射（XRD）对ZVI产生的腐蚀产物进行了鉴定，主要腐蚀产物随盐溶液类型而变化。验证了预腐蚀ZVI（pcZVI）的腐蚀程度与去除As(III/V)/Se(IV/VI)之间的正相关关系。此外，X射线光电子能谱（XPS）分析进一步支持，pcZVI去除As和Se是通过包括吸附和还原在内的综合过程实现的。我们相信这项研究将为选择在不同盐渍条件下预腐蚀的铁材料用于实际水修复提供新的思路。
