研究报告
孙佳玉,张莉,杨新敏,刘菲.纳米铁在无扰动厌氧水环境中的腐蚀过程研究[J].环境科学学报,2018,38(5):1893-1898
纳米铁在无扰动厌氧水环境中的腐蚀过程研究
- Corrosion of nano-iron in undisturbed anaerobic water
- 基金项目:国家自然科学基金(No.41572229)
- 孙佳玉
- 中国地质大学(北京)水资源与环境工程北京市重点实验室, 北京 100083
- 张莉
- 中国地质大学(北京)水资源与环境工程北京市重点实验室, 北京 100083
- 杨新敏
- 中国地质大学(北京)水资源与环境工程北京市重点实验室, 北京 100083
- 刘菲
- 中国地质大学(北京)水资源与环境工程北京市重点实验室, 北京 100083
- 摘要:近年来在地下水污染修复方面,纳米铁的应用十分广泛.纳米铁比表面积大,活性高,反应速率快,使其表面腐蚀产物多.因此,纳米铁在地下水中的腐蚀产物矿相的变化及其在污染物去除方面可能产生的影响受到越来越多的关注.本文模拟地下水厌氧环境,对纳米铁在水中的腐蚀产物通过激光拉曼、X射线衍射和X射线光电子能谱3种表征手段进行研究.结果表明:纳米铁在厌氧超纯水中的腐蚀产物为大量磁铁矿(Fe3O4)并夹杂少量磁赤铁矿(γ-Fe2O3)和纤铁矿(γ-FeOOH).在厌氧地下水中还观测到微量四方纤铁矿(β-FeOOH)和菱铁矿(FeCO3)的存在.
- Abstract:In recent years,nano-iron is applied widely in groundwater pollution remediation. The corrosion products of nano-iron is complex due to its large specific surface area,high activity and fast reaction speed. Therefore,researchers pay more and more attention to the corrosion products of nano-iron in the variation of mineral phase and its influence on the removal of pollutants. In this study,we investigated the corrosion products of nano-iron by Raman、XRD and XPS measurements in the simulated anaerobic environment of groundwater. The results showed that the corrosion products in anaerobic ultrapure water were main magnetite (Fe3O4) with a small amount of maghemite (γ-Fe2O3) and lepidocrocite (γ-FeOOH). Trace amounts of akaganeit (β-FeOOH) and siderite (FeCO3) were also observed in anaerobic groundwater.