01993nas a2200217 4500008004100000022001400041245009700055210006900152260000800221300001100229490000800240520125400248653001001502653002001512653002601532653002601558100002201584700002101606700002201627856012601649 2024 eng d a1944-399400aABPBI-based hollow fiber membranes for forward osmosis (FO) possessing low reverse salt flux0 aABPBIbased hollow fiber membranes for forward osmosis FO possess cOCT a1006410 v3203 a

The poly(2,5-Benzimidazole), known for its excellent thermochemical stability, was evaluated as a membrane material for forward osmosis. The dope in methane sulfonic acid was used to make hollow fiber membranes. The availability of bound MSA in HFMs was compared with its neutral form. Aqueous solutions of two common salts reported for FO (NaCl and MgCl2) were used as a draw solution at varying concentrations. The performance was determined in terms of water flux and reverse salt flux. The long-term performance of the membrane was assessed. The heat pretreatment of membranes was beneficial in offering low reverse salt flux, a crucial parameter in FO. The heat treatment at 350 degrees C exhibited excellent performance of low-RSF, irrespective of the draw solute used. The presence of MSA in the membrane matrix was found to be beneficial. Present HFMs exhibited reverse salt flux as low as 0.003 mol m-2 h-1 using 2 mol L-1 MgCl2 as a draw solution. The water flux of present membranes was lower than that of reported FO-membranes, which is attributable to the larger thickness of the present membranes. The findings will be used to make ABPBI-based membranes in thin form to elevate the fluxes and their practical applicability.

10aABPBI10aForward osmosis10aHollow fiber membrane10aLow reverse salt flux1 aThorat, Nitin, M.1 aLele, Ashish, K.1 aKharul, Ulhas, K. uhttps://library.ncl.res.in/content/abpbi-based-hollow-fiber-membranes-forward-osmosis-fo-possessing-low-reverse-salt-flux02369nas a2200241 4500008004100000022001400041245010200055210006900157260000800226300001100234490000800245520156400253653001001817653003301827653002801860653000901888653003001897100001801927700001801945700001701963700001801980856012901998 2024 eng d a0376-738800aThin, flat sheet, solvent-stable ABPBI-based membranes for organic solvent forward osmosis (OSFO)0 aThin flat sheet solventstable ABPBIbased membranes for organic s cAUG a1230900 v7083 a

The work demonstrates poly(2,5-benzimidazole), commonly known as ABPBI, based thin, solvent-stable, scalable flat sheet membranes for organic solvent forward osmosis (OSFO). The membranes treated at 60 and 350 degrees C were analyzed for OSFO using solvents of industrial significance (methanol, ethanol, acetonitrile, N,N-dime- thylformamide, and dimethyl sulphoxide). Although LiCl could be employed as a draw solute with methanol as a solvent, its insolubility in other organic solvents led to the use of a new, simple-to-synthesize acid-base salt, viz., triethylammonium benzoate (TB). A study on the effects of membrane treatment temperature on solvent flux, reverse salt flux (RSF), ability to use TB as draw solute with other solvents, long-duration analysis, and use of model organic compounds in the feed side led to an understanding of the applicability of present thin, scalable ABPBI membranes for OSFO. Although membranes treated at 350 degrees C possessed a lower methanol flux than those treated at 60 degrees C, the lowering in its RSF was highly attractive. TB, having a larger molecular size than LiCl, led to a slight reduction in methanol flux and a considerable reduction in RSF. With TB, extremely low RSF was observed with the chosen solvents. The long-duration study using MeOH and acetonitrile was investigated. A complete rejection of all model organic compounds of varying molecular weights and chemical functionality indicated the merits of the present thin, scalable ABPBI membranes for practical applications of OSFO.

10aABPBI10aFree -standing thin membrane10aModel organic compounds10aOSFO10aTriethylammonium benzoate1 aNitin, Thorat1 aSuresh, Valvi1 aAshish, Lele1 aUlhas, Kharul uhttps://library.ncl.res.in/content/thin-flat-sheet-solvent-stable-abpbi-based-membranes-organic-solvent-forward-osmosis-osfo01917nas a2200241 4500008004100000022001400041245011600055210006900171260000900240300001100249490000800260520107800268653001001346653002701356653002401383653003201407653003201439653001801471100002001489700001701509700002201526856012701548 2026 eng d a1383-586600aOrthophosphoric acid-doped ABPBI hollow fiber membranes for pervaporative dehydration of polar aprotic solvents0 aOrthophosphoric aciddoped ABPBI hollow fiber membranes for perva cSEP  a1390270 v4063 a

We present poly(2,5-benzimidazole) (ABPBI) based membranes, doped with orthophosphoric acid (OPA), for the sorption and pervaporative dehydration of key industrial solvents: tetrahydrofuran (THF), acetonitrile (AN), and 1,4-dioxane (DX). The ABPBI-OPA complexes were formed via protonation and hydrogen bonding, as supported by spectroscopic and structural analyses. These complexes exhibited improved separation efficacy, further enhanced by thermal treatment. The separation factors for aprotic solvent:water mixtures (85/15 w/w%) were 115 +/- 7 for THF, 350 +/- 27 for AN, and 242 +/- 92 for DX. Long-term stability tests were conducted for 360 h to evaluate the membrane stability during the dehydration of azeotropic mixtures. The present work also introduces a drying approach for hollow fiber membrane modules to restore membrane performance. The results highlight the potential of the developed membranes for the dehydration of harsh solvents and for azeotrope-breaking applications, with no observable membrane degradation over the investigated period.

10aABPBI10aHollow fiber membranes10aLong-term stability10aOrganic solvent dehydration10aOrthophosphoric acid-doping10apervaporation1 aAlladi, Lavanya1 aGawas, Saroj1 aRodrigues, Mahima uhttps://library.ncl.res.in/content/orthophosphoric-acid-doped-abpbi-hollow-fiber-membranes-pervaporative-dehydration-polar