Membrane contactors are one of many CO₂ capture techniques, and they combine chemical absorption and membrane separation. A hydrophobic membrane with high porosity, i.e., a waterproof breathable membrane, is necessary in the CO₂ absorption process of membrane contactors. Fluorinated hydrophobic membranes are commonly used in the CO₂ absorption process of membrane contactors. However, fluorinated hydrophobic membranes are toxic and harmful to our environment. Consequently, in this study, environmentally friendly, fluorine-free and waterproof breathable polydimethylsiloxane (PDMS)/polystyrene (PS) nanofibrous membranes with a high porosity of 89% are successfully fabricated using an electrospinning process. Compared with pristine PS nanofibrous membranes, PDMS doping in PS nanofibrous membranes successfully prevents liquid droplets from adhering on their surfaces, resulting in the successful fabrication of an anti-wetting membrane surface. The CO₂ absorption flux of the as-prepared PDMS/PS nanofibrous membrane is approximately 1.85 mmol m⁻² s⁻¹, which is comparable with other previously reported membranes. Furthermore, the fluorine-free hydrophobic PDMS/PS nanofibrous membranes exhibited not only durability but also reusability. As a result, the environmentally friendly, fluorine-free and waterproof breathable PDMS/PS nanofibrous membrane is promising for use in large-scale CO₂ absorption applications, such as in membrane contactors for post-combustion CO₂ capture in power plants.

中文翻译：

---

环保，无氟，防水，透气的PDMS / PS纳米纤维膜，可捕获二氧化碳

膜接触器是许多CO ₂捕获技术之一，它们将化学吸收和膜分离结合在一起。在膜接触器的CO ₂吸收过程中，需要具有高孔隙率的疏水膜，即防水透气膜。氟化疏水膜通常用于CO _2中膜接触器的吸收过程。然而，氟化疏水膜是有毒的，并且对我们的环境有害。因此，在这项研究中，使用静电纺丝工艺成功地制造了具有89％的高孔隙率的环保，无氟，防水，透气的聚二甲基硅氧烷（PDMS）/聚苯乙烯（PS）纳米纤维膜。与原始PS纳米纤维膜相比，在PS纳米纤维膜中进行PDMS掺杂可成功防止液滴粘附在其表面上，从而成功制造了防湿膜表面。所制备的PDMS / PS纳米纤维膜的CO ₂吸收通量约为1.85 mmol m ^-2 s ^-1，可与其他先前报道的膜相媲美。此外，无氟疏水性PDMS / PS纳米纤维膜不仅显示出耐久性，而且还显示出可重复使用性。结果，环保，无氟且防水的透气PDMS / PS纳米纤维膜有望用于大规模的CO ₂吸收应用，例如用于发电厂燃烧后CO ₂捕集的膜接触器。