通过3D结构和构成分析,解读在RO膜上的金属缩放机制
Hailan Wang1, Ruobin Dai1, Zhiwei Wang1
1State Key Laboratory of Water Pollution Control and Green Resource Recycling, Shanghai Institute of Pollution Control and Ecological Security, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Environmental science & technology
|May 14, 2025
概括
了解反透 (RO) 中的二氧化/缩放度是关键. 新的方法揭示了pH如何影响缩放,有助于工业RO系统的控制策略.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 环境科学 环境科学
背景情况:
- 逆透 (RO) 膜中的缩放阻碍了性能.
- 传统技术在混合尺度的高分辨率分析方面遇到了困难.
- 了解Si/Al缩放机制对于有效控制至关重要.
研究的目的:
- 在RO中阐明Si/Al缩放层的结构和组成.
- 研究pH对Si/Al缩放机制的影响.
- 结合先进的表征技术进行详细分析.
主要方法:
- 使用飞行时间二次离子质谱仪 (ToF-SIMS) 来获得深度分辨率.
- 使用热重力测量-红外光谱学 (TG-IR) 进行混合尺度的歧视.
- 在酸性,中性和性条件下分析Si/Al缩放.
主要成果:
- 酸性条件:Al在膜表面的丰富,通过聚合二氧化快速形成薄而密集的.
- 中性/性条件:通过Si/Al复合体,较慢地形成更厚,结构松散的.
- 根据pH值,TG-IR根据pH值确定了不同的Si/Al物种 (6-坐标Al,4-坐标Al,Al(OH) 4-).
结论:
- pH显著改变Si/Al缩放机制和层结构.
- 结合的ToF-SIMS和TG-IR为扩展提供了前所未有的洞察力.
- 这些发现支持开发针对性策略,以控制Si/Al在RO中的扩展.
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