Smart superwetting COF membrane for controllable oil/water separation

Recent advances of pure/independent covalent organic framework membrane materials: preparation, properties and separation applications

“…17,20 In addition, a wider range of applications can be achieved by changing the organic unit to give COF different functional groups and introducing other groups or metal ions after further functionalization. 21–26 Independent/pure COF membranes combine the advantages of the COF's ordered arrangement of pore channels, adjustable pore size, high thermal stability, and excellent chemical stability, and are expected to replace polymer membranes in the field of membrane separation technology.…”

Plant Transpiration-Inspired Biomass-Based Device with Underwater Oleophobicity for Efficient General-Purpose Solar-Driven Oily Wastewater Purification

“…Currently, membrane separation has received considerable attention due to its relatively simple operational processes. 8−12 For instance, the MXene membrane, 13 covalent organic framework membrane, 14 polytetrafluoroethylene membrane, 15 polycaprolactone-mixed supramolecular framework fiber membrane, 16 cobalt phosphide/stainless steel mesh membrane, 17 and fish gelatin membrane 18 have been prepared to efficiently handle oily wastewater. However, it is complicated to realize the purification of various types of oily wastewater with only one membrane because there are not only oil droplets but also salt ions, organic and acids, or alkaline pollutants in oily wastewater.…”

“…Conventional approaches for the treatment of the oil/water mixture include centrifugation separation, gravity separation, physical adsorption, and chemical treatment, which all have obvious disadvantages of environmental pollution, high capital, and inefficient separation. Currently, membrane separation has received considerable attention due to its relatively simple operational processes. − For instance, the MXene membrane, covalent organic framework membrane, polytetrafluoroethylene membrane, polycaprolactone-mixed supramolecular framework fiber membrane, cobalt phosphide/stainless steel mesh membrane, and fish gelatin membrane have been prepared to efficiently handle oily wastewater. However, it is complicated to realize the purification of various types of oily wastewater with only one membrane because there are not only oil droplets but also salt ions, organic and acids, or alkaline pollutants in oily wastewater. ,, Therefore, the efficient purification of oil/water mixtures to obtain fresh water is still an urgent issue that must be addressed.…”

Robust self-healing superhydrophobic cotton fabric for durable and efficient oil–water separation

“…However, the difficulty in removing oil and the longevity of these porous materials have a significant impact on their practical usage. 15,16…”

“…However, the difficulty in removing oil and the longevity of these porous materials have a significant impact on their practical usage. 15,16 Self-healing processes of superhydrophobic materials have garnered considerable interest to extend their service life. [17][18][19][20] To preserve the original characteristics of the material in severe settings, self-healing coatings tend to impart a certain degree of self-healing with external stimulation.…”