Crosslinking of modified poly(ether ether ketone) membranes for use in solvent resistant nanofiltration

Investigation of adsorption behaviors of Cu(II), Pb(II), and Cd(II) from water onto the high molecular weight poly (arylene ether sulfone) with pendant carboxyl groups

“…Compared with the spectrum of PAES, a new peak appears at 12 ppm, confirming that the carboxylic group was successfully incorporated into PAES-C structure. 22 As to PAESK-C spectrum, the aromatic protons peaks centering at 7.74, 7.95, and 8.17 ppm are observed due to the effect of the carbonyl groups in molecular main-chain. As shown in Figure 1(d,e), the absence of the peak at 12 ppm suggested the formation of sodium salt of polymers (PAES-C-Na and PAESK-C-Na).…”

“…19,20 At present, DPA and its derivatives have been extensively applied in polymers synthesis, but little focused on the heavy metal ions removal such as Cu 21 , Pb 21 , and Cd 21 from wastewater with the as-prepared polymers. [21][22][23] Furthermore, this work aimed to investigate the adsorption abilities of Cu 21 onto polymers containing sodium salt (poly (arylene ether sulfone) with sodium carboxylate groups (PAES-CNa), poly (arylene ether sulfone ketone) with sodium carboxylate groups (PAESK-C-Na)), and PAES which contains various molar ratios of carboxyl and phenylene. PAES-C-Na and PAESK-C-Na were obtained from the as-prepared PAES-C and PAESK-C with NaOH, respectively.…”

Organic solvent resistant poly(ether-ether-ketone) nanofiltration membranes

“…PEEK-WC can also be in its sulphonated form as SPEEK-WC [17]. Another recent approach for modifying PEEK was reported by Hendrix et al [18,19]. This research group proposes two ways of modifying PEEK, either by adding a different monomer [18] or by crosslinking PEEK [19] (see Table 1).…”

Crosslinked polybenzimidazole membranes for organic solvent nanofiltration (OSN): Analysis of crosslinking reaction mechanism and effects of reaction parameters

“…Among them is the membrane stability in harsh organic solvents. Research on this challenge has been focused on finding new suitable materials [4,5] or improving existing ones [6,7,8,9,10,11,12] mainly based on knowledge from other membrane processes, e.g. aqueous nanofiltration (NF), reverse osmosis (RO) and gas separation.…”