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<p>Gas-liquid membrane contactor (GLMC) technology shows significant promise for industrial carbon dioxide (CO<sub>2</sub>) capture, but its adoption is hindered by the poor wetting resistance or low CO<sub>2</sub> absorption rate of conventional monolithic hydrophobic membranes. This work presents a thin-film composite (TFC) Janus membrane fabricated by coating a polyvinyl alcohol (PVA) layer featuring density and hydrophilicity onto a commercial hydrophobic polyvinylidene fluoride (PVDF) membrane substrate for GLMC applications. The TFC Janus membrane demonstrated robust wetting resistance during a 72-h GLMC experiment while maintaining a relatively high CO<sub>2</sub> absorption rate (2.85 × 10<sup>−3</sup> mol/(m<sup>2</sup>·s)), enabling robust and efficient CO<sub>2</sub> capture. Diffusion experiments and breakthrough pressure tests attributed the exceptional wetting resistance to a combination of size exclusion and high capillary pressure within the dense PVA layer, which effectively hinders CO<sub>2</sub> absorbent solutions from accessing the hydrophobic PVDF substrate. Furthermore, membrane impedance measurements and ultrasonic time-domain reflectometry analysis revealed that the high CO<sub>2</sub> absorption rate resulted from an expanded gas-liquid interface created by the PVA layer penetrating into the PVDF substrate. Overall, this work offers valuable insights into the design and optimization of high-performance GLMC membranes, advancing practical applications of GLMC technology.</p>

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Robust and efficient membrane contactor for carbon dioxide capture enabled by thin-film composite Janus membrane

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • Wenting Zhou,
  • Chunlei Su,
  • Dejun Feng,
  • Yuanmiaoliang Chen,
  • Liting Pan,
  • Di He,
  • Zhangxin Wang

摘要

Gas-liquid membrane contactor (GLMC) technology shows significant promise for industrial carbon dioxide (CO2) capture, but its adoption is hindered by the poor wetting resistance or low CO2 absorption rate of conventional monolithic hydrophobic membranes. This work presents a thin-film composite (TFC) Janus membrane fabricated by coating a polyvinyl alcohol (PVA) layer featuring density and hydrophilicity onto a commercial hydrophobic polyvinylidene fluoride (PVDF) membrane substrate for GLMC applications. The TFC Janus membrane demonstrated robust wetting resistance during a 72-h GLMC experiment while maintaining a relatively high CO2 absorption rate (2.85 × 10−3 mol/(m2·s)), enabling robust and efficient CO2 capture. Diffusion experiments and breakthrough pressure tests attributed the exceptional wetting resistance to a combination of size exclusion and high capillary pressure within the dense PVA layer, which effectively hinders CO2 absorbent solutions from accessing the hydrophobic PVDF substrate. Furthermore, membrane impedance measurements and ultrasonic time-domain reflectometry analysis revealed that the high CO2 absorption rate resulted from an expanded gas-liquid interface created by the PVA layer penetrating into the PVDF substrate. Overall, this work offers valuable insights into the design and optimization of high-performance GLMC membranes, advancing practical applications of GLMC technology.