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弹性高温反透淡化膜

Jishan Wu^1,2,3, Minhao Xiao⁴, Jinlong He^5,6

¹Rice WaTER Institute, Rice University, Houston, TX 77005, USA.

Science advances

|January 14, 2026

概括

高温反透膜由于结构损坏而失效. 一种新的耐热薄膜交叉连接 (TFX) 膜保持了性能,使得高温水可重复使用.

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.
膜技术膜技术膜技术

背景情况:

传统的薄膜复合材料 (TFC) 逆透 (RO) 膜在高温 (>60°C) 下不可逆地降解.
这种热不稳定性限制了它们在各种工业高温工艺中的应用,例如石油和天然气以及发电.
在高温下TFC膜性能下降背后的精确机制尚未完全理解.

研究的目的:

为了研究高温下TFC膜的故障机制.
为了评估一种新型薄膜交联 (TFX) 复合膜的热弹性和性能.
探索TFX膜在高温RO淡化和水再利用中的潜力.

主要方法:

控制的实验室实验来评估在热应力下膜的性能.
分子动力学模拟以了解分子水平上的物质行为.
微机械建模分析结构完整性和故障模式.
扫描电子显微镜 (SEM) 用于可视化结构损伤.

主要成果:

在60°C以上,TFC膜的盐排放量显著下降,从~99%到<90%,伴随着聚硫支层的不可逆转的结构损伤.
TFX膜保持了~99%的盐排斥,并且在高达80°C的温度下没有物理降解.
分析显示,TFC故障是由聚硫支中的孔隙扩张引起的,导致聚胺薄膜破裂和分层.

结论:

在高温下TFC膜的故障是由于不可逆转的孔隙扩张和随后的薄膜分层.
与TFC膜相比,TFX膜表现出优越的热稳定性和抗变形性.
TFX膜为超高温RO淡化和工业用水再利用应用提供了一个有前途的解决方案.

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