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Resilient high-temperature reverse osmosis desalination membranes.

Jishan Wu1,2,3, Minhao Xiao4, Jinlong He5,6

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High-temperature reverse osmosis (RO) membranes fail due to structural damage. A new thermally resilient thin-film cross-linked (TFX) membrane maintains performance, enabling high-temperature water reuse.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Membrane Technology

Background:

  • Conventional thin-film composite (TFC) reverse osmosis (RO) membranes degrade irreversibly at high temperatures (>60°C).
  • This thermal instability limits their application in various industrial high-temperature processes, such as oil and gas, and power generation.
  • The precise mechanisms behind TFC membrane performance decline at elevated temperatures are not fully understood.

Purpose of the Study:

  • To investigate the failure mechanisms of TFC membranes at high temperatures.
  • To evaluate the thermal resilience and performance of a novel thin-film cross-linked (TFX) composite membrane.
  • To explore the potential of TFX membranes for high-temperature RO desalination and water reuse.

Main Methods:

  • Controlled laboratory experiments to assess membrane performance under thermal stress.
  • Molecular dynamics simulations to understand material behavior at the molecular level.
  • Micromechanical modeling to analyze structural integrity and failure modes.
  • Scanning electron microscopy (SEM) to visualize structural damage.

Main Results:

  • TFC membranes exhibited a significant drop in salt rejection from ~99% to <90% above 60°C, accompanied by irreversible structural damage in the polysulfone support layer.
  • TFX membranes maintained ~99% salt rejection and showed no physical degradation up to 80°C.
  • Analysis revealed TFC failure is caused by pore expansion in the polysulfone support, leading to polyamide film rupture and delamination.

Conclusions:

  • TFC membrane failure at high temperatures is attributed to irreversible pore expansion and subsequent film delamination.
  • TFX membranes demonstrate superior thermal stability and resistance to deformation compared to TFC membranes.
  • TFX membranes offer a promising solution for ultrahigh-temperature RO desalination and industrial water reuse applications.