Non-Fluorinated and Robust Superhydrophobic Modification on Covalent Organic Framework for Crude-Oil-in-Water Emulsion Separation

被引:56
作者
Ruidas, Santu [1 ]
Das, Avijit [2 ]
Kumar, Saurav [2 ]
Dalapati, Sasanka [4 ]
Manna, Uttam [2 ,3 ]
Bhaumik, Asim [1 ]
机构
[1] Indian Assoc Cultivat Sci, Sch Mat Sci, Kolkata 700032, India
[2] Indian Inst Technol Guwahati, Dept Chem, Kamrup 781039, Assam, India
[3] Indian Inst Technol Guwahati, Ctr Nanotechnol, Kamrup 781039, Assam, India
[4] Cent Univ Tamil Nadu CUTN, Dept Mat Sci, Sch Technol, Thiruvarur 610005, Tamil Nadu, India
关键词
Covalent Organic Framework (COF); Selective Oil-Absorption; Superhydrophobicity; Surface Functionalization; Water-in-Oil Emulsion Separation; MIXTURES; GRAPHENE; SURFACE; SPONGE; ZIF-8; OXIDE;
D O I
10.1002/anie.202210507
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Covalent organic frameworks (COFs) having high specific surface area, tunable pore size and high crystallinity are mostly post modified following fluorine-based and complex synthetic approaches to achieve a bio-inspired liquid wettability, i.e. superhydrophobicity. Herein, a facile, non-fluorinated and robust chemical approach is introduced for tailoring the water wettability of a new COF-which was prepared through Schiff-base condensation reaction. A silane precursor was readily reacted with selected alkyl acrylates through 1,4-conjugate addition reaction, prior to grafting on the prepared C4-COF for tailoring different water wettability-including robust superhydrophobicity. The superhydrophobic C4-COF (SH-C4-COF) that displayed significantly enhanced (>5 times; from 220 wt. % to 1156 wt. %) oil-absorption capacity, was extended to address the relevant challenges of "oil-in-water" emulsion separation, rapidly (<1 minute) and repetitively (50 times) at diverse and harsh conditions.
引用
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页数:10
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