pH-Responsive smart non-woven fabrics (NWFs) with double switchable wettability between superhydrophilicity-superhydrophobicity-superhydrophilicity to oil/water separation

pH-Responsive smart non-woven fabrics (NWFs) with double transformations were prepared via the in situ grafting of Ag nanoparticles through an oxidation-reduction reaction and were modified using a mixed thiol-molecule solution, including HS(CH 2 ) 10 CH 3 , HS(CH 2 ) 10 COOH and HS(CH 2 ) 11 OH. A...

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Bibliographic Details
Published in:New journal of chemistry 2019-04, Vol.43 (17), p.6712-672
Main Authors: Zhang, Zhibin, Yu, Hang, Guo, Jiahong, Bai, Zhiwei, Zhang, Shiping, Zhang, Yajuan, Wang, Jikui
Format: Article
Language:English
Subjects:
Chemical reduction
Hydrophilicity
Hydrophobic surfaces
Hydrophobicity
Nanoparticles
Nonwoven fabrics
Oxidation
Selectivity
Separation
Silver
Switches
Water purification
Water treatment
Wettability
Woven fabrics
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Summary:pH-Responsive smart non-woven fabrics (NWFs) with double transformations were prepared via the in situ grafting of Ag nanoparticles through an oxidation-reduction reaction and were modified using a mixed thiol-molecule solution, including HS(CH 2 ) 10 CH 3 , HS(CH 2 ) 10 COOH and HS(CH 2 ) 11 OH. A NWF continuously separates immiscible oil-water mixtures with high selectivity and has considerable flux under gravity. The wettability of NWFs with an optimal thiol concentration shows reversible switches between superhydrophilicity-superhydrophobicity-superhydrophilicity, which corresponds to different conditions such as acidic, neutral and basic. The as-prepared NWFs had great oil absorption capacities and possessed high oil-water separation efficiency. This simple approach to fabricate pH-responsive NWFs has provided a facile and versatile strategy for effectively separating oil-water mixtures, which can be further applied for water treatment, purification of solvents or fuels and so on. pH-Responsive smart non-woven fabrics (NWFs) possess double switchable wettability and excellent selectivity, separation efficiency and mechanical properties for recyclability.
ISSN:1144-0546
1369-9261
DOI:10.1039/c9nj00409b