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具有分级荷叶状界面的超疏水表面构建膜接触器用于高效SO捕获。

Superhydrophobic Surface-Constructed Membrane Contactor with Hierarchical Lotus-Leaf-Like Interfaces for Efficient SO Capture.

作者信息

Xin Qingping, Li Xu, Hou Hailong, Liang Qingqing, Guo Jianping, Wang Shaofei, Zhang Lei, Lin Ligang, Ye Hui, Zhang Yuzhong

机构信息

State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China.

CNOOC Gas and Power Group/R & D Center, Chaoyang District Taiyanggong South Street No. 6, Beijing 100028, China.

出版信息

ACS Appl Mater Interfaces. 2021 Jan 13;13(1):1827-1837. doi: 10.1021/acsami.0c17534. Epub 2020 Dec 30.

Abstract

An organic-inorganic polyvinylidene fluoride/polyvinylidene fluoride-silica (PVDF/PVDF-SiO) mixed matrix membrane contactor is fabricated via a facile and efficient hydrophobic modification method. The solubility parameters of the PVDF particle are precisely regulated, the PVDF particles are blended with SiO nanoparticles to form PVDF-SiO suspension, and then the suspension is introduced onto the surface of the PVDF substrate by an spin coating strategy. The PVDF particles are partly etched and incorporated to construct the adhesive PVDF-SiO core-shell layer on the PVDF substrate, which results in a more stable PVDF-SiO coating layer on the substrate. The surface structure is precisely regulated by changing the etching morphology of PVDF particles and amount of doped PVDF and SiO particles, forming an integrated porous PVDF-SiO layer and constructing hierarchical lotus-leaf-like interfaces. The resultant PVDF/PVDF-SiO membrane contactors display the relatively regular distribution of pore size with ∼420 nm and excellent hydrophobic property with a water contact angle of ∼158°, which noticeably lightens wetting phenomena of membrane contactors. The SO absorption fluxes can reach as high as 1.26 × 10 mol·m·s using 0.625 M of ethanolamine (EA) as liquid absorbent. The high stability of the SO absorption flux test indicates the excellent interface compatibility between the PVDF-SiO coating layer and the PVDF substrate. The versatile organic-inorganic layer exhibits super hydrophobic property, which prevents wetting of membrane pores. In addition, the membrane mass transfer resistance (/) and membrane phase transfer coefficient () are explored.

摘要

通过一种简便高效的疏水改性方法制备了一种有机-无机聚偏氟乙烯/聚偏氟乙烯-二氧化硅(PVDF/PVDF-SiO)混合基质膜接触器。精确调节PVDF颗粒的溶解度参数,将PVDF颗粒与SiO纳米颗粒混合形成PVDF-SiO悬浮液,然后通过旋涂策略将该悬浮液引入PVDF基底表面。对PVDF颗粒进行部分蚀刻并使其结合,从而在PVDF基底上构建具有粘性的PVDF-SiO核壳层,这使得基底上的PVDF-SiO涂层更加稳定。通过改变PVDF颗粒的蚀刻形态以及掺杂的PVDF和SiO颗粒的数量来精确调节表面结构,形成完整的多孔PVDF-SiO层并构建分级荷叶状界面。所得的PVDF/PVDF-SiO膜接触器显示出孔径相对规则分布,约为420 nm,具有优异的疏水性,水接触角约为158°,这显著减轻了膜接触器的润湿现象。以0.625 M乙醇胺(EA)作为液体吸收剂时,SO吸收通量可高达1.26×10 mol·m·s。SO吸收通量测试的高稳定性表明PVDF-SiO涂层与PVDF基底之间具有优异的界面相容性。这种多功能的有机-无机层具有超疏水性,可防止膜孔被润湿。此外,还探究了膜传质阻力(/)和膜相传质系数()。

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