Superhydrophobic Metal–Organic Framework Membrane with Self-Repairing for High-Efficiency Oil/Water Emulsion Separation

Abstract

Special wetting characteristic surfaces typically combine low-surface-energy micro/nanoscale structures, and special wetting coating material applications are wide-ranging, including self-cleaning and drag-reducing surfaces to anti-adhesives. However, the poor durability of these special wetting surfaces greatly limits their practical application, and external conditions such as illumination, friction, and corrosion can damage and destroy the low-surface-energy surface of the superhydrophobic coatings. These low-surface-energy materials must then be redeposited to restore the superhydrophobic coatings, which is cost and time prohibitive. Endowing superhydrophobic coatings with a self-repairing performance could effectively solve these durability problems. Here we report a robust, superhydrophobic metal organic framework layer membrane with a repair ability. This composite membrane was prepared by a simple wet-chemistry coating technique consisting of fluorinated alkyl silane, a fluorocarbon surfactant, and a hydrophobic ZIF-90 membrane. This study represents a durable superhydrophobic membrane for sewage treatment application.

Superhydrophobic Self-Cleaning Hierarchical Micro-/Nanocomposite Coating with High Corrosion Resistance and Durability

“…The continuous progress in the field of micro- and nanoscale materials science allowed scientists to have access to wide variety of particles suitable for the construction of superhydrophobic surfaces, such as SiO 2 , ZnO, Fe 3 O 4 , and metal–organic frameworks (MOFs). − In particular, MOFs, which are porous crystalline coordination polymers, have received significant attention for many applications. MOFs can be designed in a wide diversity of structures, i.e., films, fibers, or particles .…”

Hierarchical porous metal–organic framework materials for efficient oil–water separation

“…To achieve the long-term utilization of MOF-based oil-water separating systems, a ZIF-90 (Zn(ica) 2 with ica À ¼ imidazolate-2carboxyaldehyde) based membrane exhibiting superhydrophobicity (WCA ¼ 170 ) and self-repairing properties has been prepared. 153 In addition to ZIF-90, the synthesized membrane consisted of a uoro-polymer (FAS) and a uorinated copolymer (Zonyl 321), which incorporates uoroalkyl silane units on the surface as well as inside the porous membrane. The O 2 plasma treatment destroys the surface anchored uoroalkyl silane units, leaving behind a rough surface with lyophilic groups, which made the membrane surface superhydrophilic.…”

Design, Development, and Outlook of Superwettability Membranes in Oil/Water Emulsions Separation

“…Superhydrophobic membranes with self‐healing property for oil/water emulsions separation were successfully fabricated. [ 209 ] Lu and co‐workers (2019) reported a superhydrophobic polydivinylbenzene (PDVB) and 1H, 1H, 2H, 2H‐perfluorooctyltriethoxysilane (POTS) modified multi‐walled CNT film with self‐healing property via solvothermal method and chemical vapor deposition (CVD) methods. [ 210 ] After the multiple O 2 plasma destruction and self‐healing cycles, the contact angle of water was still above 150°, proving its excellent self‐healing performance.…”