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

Abstract

Covalent organic frameworks (COFs) having high specific surface area, tunable pore size and high crystallinity are mostly post modified following fluorinebased 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.

Design and Construction of an Azo-Functionalized POP for Reversibly Stimuli-Responsive CO2 Adsorption

“…It confirms that JJU-1 is microporous. The desorption curves of both materials showed little hysteresis due to the diffusional limitation of adsorbed N 2 molecules in restricted micropores [ 54 ]. The sample surface areas are computed using the Langmuir and BET models, which are summarized in Table 1 .…”

Effect of Symmetry and Increasing Hydrophobicity on the Self-Assembly and Function of Benzoylurea Derivatives

“…Finally, we have tried to separate the oil and water from the oil–water emulsion , using compound 3 . A total of 20 μL of gasoline was taken in 5 mL of water and sonicated for 5 min to form the oil–water emulsion.…”

Various approaches to synthesize water-stable halide PeNCs

“…Superhydrophobic modication could further improve the water stability of PeNCs. [122][123][124] For instance, Zhang et al developed a superhydrophobic lead PeNC lm by creating a self-assembled monolayer of 1H,1H,2H,2H-peruorodecanethiol. 36 The thiol group of the peruorocarbon chains passivated the uncoordinated sites on the perovskite surface by forming the Pb-S bond.…”