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Hierarchically-structured superhydrophobic POSS/PVDF composite membrane for anti-fouling and anti-wetting membrane distillation
Zheng, Libing; Wang, Kai; Hou, Deyin; Jia, Xiaolin; Zhao, Zhichao
2022-03-15
Source PublicationDESALINATION
ISSN0011-9164
Volume526Issue:0Pages:115512
AbstractMembrane fouling and wetting were two unsolved issues for membrane distillation (MD), fostered an enduring pursuit of well-designed superhydrophobic membrane. In this work, a novel hierarchically-structured super hydrophobic membrane was prepared by grafting octavinyl-polyhedral oligomeric silsesquioxane (OVPOSS) onto polyvinylidene fluoride (PVDF) membrane via UV-induced thiolene click reaction after the hydroxylation and sulfhydrylation pretreatment. The POSS/PVDF membrane exhibited high roughness and superhydrophobicity, and the pore structure was optimized with smaller size but centralized distribution. For the fabricated super hydrophobic membrane with low sliding angle (about 7.5), the maintaining of Cassie-Baxter state and the slip effect significantly mitigated membrane fouling and wetting, due to the retardation of the liquid invasion into the gas-solid interface. It was found that scaling was the leading fouling for the commercial PVDF membrane, and the interaction between Ca2+ and carboxyl was the main organic fouling mechanism. While for the POSS/PVDF membrane, organic fouling via hydrophobic-hydrophobic interaction was the main membrane fouling and the scaling was significantly alleviated. The fabricated POSS/PVDF composite membrane had significant superiority over commercial PVDF membrane, which showed promising potential in challenging wastewater treatment. Additionally, this work also offered a new and facile method for superhydrophobic membrane fabrication.
Department水污染控制实验室 ; 水污染控制实验室
KeywordWASTE-WATER TREATMENT HYDROPHOBIC MEMBRANE PVDF MEMBRANE FABRICATION POSS SURFACE DESALINATION COATINGS SLIPPERY ACID
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/47752
Collection水污染控制实验室
Corresponding AuthorHou, Deyin
Affiliation1.Chinese Acad Sci, Natl Engn Res Ctr Ind Wastewater Detoxicat & Reso, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Lab Water Pollut Control Technol, Beijing 100085, Peoples R China
3.Hebei Univ Technol, Sch Chem Engn & Technol, Tianjin 300130, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zheng, Libing,Wang, Kai,Hou, Deyin,et al. Hierarchically-structured superhydrophobic POSS/PVDF composite membrane for anti-fouling and anti-wetting membrane distillation[J]. DESALINATION,2022,526(0):115512.
APA Zheng, Libing,Wang, Kai,Hou, Deyin,Jia, Xiaolin,&Zhao, Zhichao.(2022).Hierarchically-structured superhydrophobic POSS/PVDF composite membrane for anti-fouling and anti-wetting membrane distillation.DESALINATION,526(0),115512.
MLA Zheng, Libing,et al."Hierarchically-structured superhydrophobic POSS/PVDF composite membrane for anti-fouling and anti-wetting membrane distillation".DESALINATION 526.0(2022):115512.
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