了解在使用中子和X射线反射计进行地下水电凝过程中电极的溶解和被动化
Gyoung Gug Jang1, Jong K Keum2, Swapnamoy Dutta1
1Manufacturing Science Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, Tennessee 37831, United States.
ACS applied materials & interfaces
|April 21, 2025
概括
电凝可以有效地去除二氧化和硬度. 离子增强了Al溶解和污染物去除,而硫酸盐离子形成了被动化层,增加了地下水处理的能源需求.
科学领域:
- 环境科学与工程环境科学与工程
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
背景情况:
- 电凝 (Al-EC) 有效地从地下水中去除溶解的和硬度.
- 包括污染物去除,效率和能源使用在内的Al-EC性能受到电极界面反应 (电解或被动化) 的显著影响.
研究的目的:
- 调查不同离子 (和硫酸盐) 对地下水处理的Al-EC性能的影响.
- 使用先进的表面分析技术,了解在Al-EC过程中溶解和被动化的界面机制.
主要方法:
- 通过使用地下水模拟剂 (基,硫酸盐基和混合溶液) 的连续流通Al-EC系统.
- 在位中子反射计 (NR) 用于研究纳米级的界面动力学.
- 现场X射线反射计 (XRR) 支持NR发现.
主要成果:
- 以化物为基础的溶液显示出高污染物去除和低能耗,并增强了Al溶解.
- 硫酸盐基溶液的污染物清除率很低,由于形成了被动化Al2O3层,因此能耗很高.
- 混合溶液表现出化物和硫酸盐效应的特征,Al溶解和被动化发生.
结论:
- 离子促进阳极性Al溶解,提高Al-EC的效率,减少能源需求.
- 硫酸盐离子通过形成被动化Al2O3层来抑制Al溶解,从而对Al-EC性能产生负面影响并增加能源需求.
- 了解离子特定的接口机制对于优化可持续地下水处理的Al-EC系统至关重要.
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