Facile tunning the morphology and porosity of a superwetting conjugated microporous polymers

Two‐Dimensional Fluorinated Covalent Organic Frameworks with Tunable Hydrophobicity for Ultrafast Oil–Water Separation

“…By far, various hydrophobic membranes,s uch as those derived from organic polymers, [16] metal-organic frameworks, [21] carbon, [22] and reduced graphene oxides, [23] have been prepared for oil/water separation, but they often showed unsatisfactory selectivity,l ow flux, and/or low chemical stability.C ompared with the SSN-supported hydrophobic BTADHBD-COF coating that was fabricated by post-synthetic modification, [15b] the present COF@SSN coating fabricated via de novo synthesis exhibit higher structural stability,b etter crystallinity,a nd no apparent defects.I mportantly,the 3@SSN coating displayed high water-resistance and self-cleaning property,e nabling high oil-water separation performances with ahigh degree of reusability that was driven only by gravity.T ot he best of our knowledge,t he present separation efficiency( > 99.5 %) and permeation flux (2.84 10 5 Lm À2 h À1 )a re among the highest values reported for the state-of-the-art coatings based on MOFs, [17] COFs, [15b] and amorphous organic polymers [16] that were grown on the SSN substrates and other superhydrophobic membranes like textiles,fabrics,f ibers,etc. (Tables S1 and S2).…”

“…By co-condensation of triamines with fluorine and/or isopropyl groups and perfluorodialdehyde,t hree 2D porous COFs with AA or ABC stacking were crystallized (Scheme 1). The COFs exhibited excellent chemical stability in harsh environments and tunable hydrophobicity with the water contact angle (CA) of 111.5-145.88 8.B oth COFs functionalized with mixed isopropyl and fluorine groups can grow as ac oating supported on astainless-steel net (SSN) substrate by covalent bonding.T he superhydrophobic COF@SSN coating with CA of up to 150.18 8 exhibited high water-resistance and selfcleaning properties,e nabling high oil-water separation performances that can be driven only by gravity.B oth the separation efficiency( > 99.5 %) and permeation flux (2.84 10 5 Lm À2 h À1 )a re among the highest values reported for the state-of-the-art membranes derived from metal-organic frameworks, [17] COFs, [15b] and amorphous organic polymers [16] that were grown on the SSN substrates (Table S1).…”

“…[15] Moreover,e fforts to produce hydrophobic COF membrane via de novo synthesis typically afford amorphous structures rather than crystalline phases. [16] Obviously,i tr emains ac hallenge to overcome the inherent limitations of hydrophobic COFs in terms of the wettability and processability as crystalline membranes.…”

Facile Preparation of Micro/Mesoporous Conjugated Polymers for Multifunctional Sensing and Separation Applications

“…CMPs are most formed by rigid π aromatic (or heterocyclic) units . CMPs and COFs are often fluorescent materials. They could act as light‐sensitive materials.…”

Superhydrophobic/Superoleophilic MOF Composites for Oil–Water Separation

“…On the basis of the excellent porosity and surface wettability, S-MOF composites should be admirable candidates for the absorption of organic solvents. The absorption capacity of S-MOF composites toward various organic solvents (especially nonpolar or weakly polar organic solvents) was explored by using a procedure similar to that reported by Li and coworkers . In a typical absorption measurement, toluene was added to the postsynthetic grafted S-MOF powder at room temperature and then kept for 30 min to achieve saturated absorption; then, the samples were separated by centrifugation and finally weighed.…”