Amidoxime-functionalized polymer of intrinsic microporosity (AOPIM-1)-based thin film composite membranes with ultrahigh permeance for organic solvent nanofiltration

Removal of dyes using polymers of intrinsic microporosity (PIMs): a recent approach

“…are considered as suitable candidates for the selective layers of nanofiltration membranes based on their rigid backbones and suitable pore sizes as compared to commercially used nanofiltration membranes containing polybenzimidazoles, polyimides, etc., which suffer from small free volumes. 43,65 A literature investigation shows that only a few PIMs have been studied for nanofiltration-based separation of dyes so far. For example, a membrane of PIM-1 on a polyacrylonitrile (PAN) support was studied for separation of a number of cationic and anionic dyes from their respective ethanolic solutions.…”

“…For example, a stable nanofiltration membrane was prepared by deposition of AOPIM-1 on a PAN support. 65 The membrane was tested for separation of six anionic dyes, viz., acid yellow 79 (M W : 1111 g mol À1 ), rose bengal (RB, M W : 1017 g mol À1 ), reactive black 5 (M W : 991 g mol À1 ), direct red 23 (M W : 813 g mol À1 ), CR (M W : 696 g mol À1 ), and acid fast yellow G (M W : 551 g mol À1 ) from their ethanolic solutions. Although the membrane shows excellent stability, it displays a high MWCO of 800 g mol À1 .…”

“…, which suffer from small free volumes. 43,65 A literature investigation shows that only a few PIMs have been studied for nanofiltration-based separation of dyes so far. For example, a membrane of PIM-1 on a polyacrylonitrile (PAN) support was studied for separation of a number of cationic and anionic dyes from their respective ethanolic solutions.…”

Carbonate-based hyper-cross-linked polymers with pendant versatile electron-withdrawing functional groups for CO2adsorption and separation

“…Typically, these proposed materials can be divided into traditional specimens such as zeolites, 4 clay, 5 silica, 6 diatomite, 7 activated carbon, 8 carbon nanotubes, 9 and alkali carbonate, 10 and emerging ones such as metal-organic frameworks 11,12 and microporous organic polymers, 13,14 mainly including covalent organic building blocks, SEM and TEM of carbonate-based polymers, TGA analysis of obtained polymers, pore distribution and pore size distribution calculated using NLDFT methods of the prepared porous organic polymers, adsorption selectivity of CO 2 /N 2 and CO 2 /CH 4 for the polymers calculated by employing the Henry's law initial slope method according to their adsorption isotherms of CO 2 , N 2 and CH 4 at 273.15 K and 298.15 K, content of different elements for porous hyper-cross-linked polymers based on the elemental analysis and parent building blocks by theoretical calculation, the equation used for calculating the yield of the synthesized polymers, and the formula employed to determine the elemental content of the building-block molecules. See https://doi.org/10.1039/d2ta02774g frameworks, 15,16 conjugated microporous polymers, 17,18 polymers of intrinsic microporosity, 19,20 and hyper-cross-linked polymers. 21,22 Among these, HCPs have a wide range of available building blocks, [23][24][25] alternative catalysts, 26,27 and diverse synthetic techniques, 28,29 and can usually be readily prepared via Friedel-Cras chemistry with high yield and simple operation procedures.…”

“…To tackle this challenge, viable porous adsorbents with versatile architectures have been developed. Typically, these proposed materials can be divided into traditional specimens such as zeolites, 4 clay, 5 silica, 6 diatomite, 7 activated carbon, 8 carbon nanotubes, 9 and alkali carbonate, 10 and emerging ones such as metal–organic frameworks 11,12 and microporous organic polymers, 13,14 mainly including covalent organic frameworks, 15,16 conjugated microporous polymers, 17,18 polymers of intrinsic microporosity, 19,20 and hyper-cross-linked polymers. 21,22 Among these, HCPs have a wide range of available building blocks, 23–25 alternative catalysts, 26,27 and diverse synthetic techniques, 28,29 and can usually be readily prepared via Friedel–Crafts chemistry with high yield and simple operation procedures.…”