Carbon capture efficiency of membrane gas absorption was improved using a nearly superhydrophobic membrane. This membrane, polyvinylidene fluoride (PVDF) membrane, was blended with TiO2 nanoparticles and post-modified with octadecyltrichloro silane to reduce wetting. Wetting reduction is important to minimize mass transfer resistance in membrane pores during carbon capture. The hydrophilic TiO2 nanoparticles reduced membrane pore size and hydrophobicity in dual bath coagulation, but they offered active sites for silane modification as proven by Fourier-transform infrared spectra to achieve a water contact angle up to 148.8o. A non-wetting surface near to Cassie-Baxter state was formed due to the nano-roughness of TiO2 nanoparticles and hydrophobic functional groups of silane. The modified membrane showed higher CO2 absorption flux in comparison to the neat PVDF membrane, as much as 114% improvement. The modified membrane also achieved faster carbon capture into water. Furthermore, PVDF and PVDF/TiO2 membranes modified with octadecyltrichloro silane in ethanol (volume ratio of 5 : 50) were less affected by NaOH absorbent, displaying great potential for carbon capture and storage using alkaline waste.

中文翻译：

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使用十八烷基三氯硅烷改性的 PVDF/TiO2 膜通过碱性吸收剂捕获碳

使用近乎超疏水的膜提高了膜气体吸收的碳捕获效率。这种膜，即聚偏二氟乙烯 (PVDF) 膜，与 TiO2 纳米颗粒混合，并用十八烷基三氯硅烷进行后改性以减少润湿。润湿减少对于减少碳捕获过程中膜孔中的传质阻力很重要。亲水性 TiO2 纳米粒子在双浴凝固过程中减小了膜孔径和疏水性，但它们为硅烷改性提供了活性位点，如傅立叶变换红外光谱所证明的那样，可实现高达 148.8o 的水接触角。由于 TiO2 纳米颗粒的纳米粗糙度和硅烷的疏水性官能团，形成了接近 Cassie-Baxter 状态的非润湿表面。与纯 PVDF 膜相比，改性膜表现出更高的 CO2 吸收通量，提高了 114%。改性膜还实现了更快的碳捕获到水中。此外，用乙醇中的十八烷基三氯硅烷（体积比为 5:50）改性的 PVDF 和 PVDF/TiO2 膜受 NaOH 吸收剂的影响较小，显示出利用碱性废物进行碳捕获和储存的巨大潜力。