02308nas a2200241   4500008004100000022001400041245009600055210006900151260007300220300001000293490000800303520143000311653001301741653002301754653002401777653002701801653002001828100002701848700002201875700002001897700002201917856012701939       2011                        eng d  a0011-916400aPoly(acrylonitrile) based ultrafiltration membranes: optimization of preparation parameters0 aPolyacrylonitrile based ultrafiltration membranes optimization o  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV  a46-530 v2823 a<p>Supported ultrafiltration (UF) membranes based on poly(acrylonitrile) were prepared while varying crucial parameters responsible for controlling membrane porosity, viz.; polymer concentration, solvent and additives in the dope solution. Insight into membrane porosity and morphology was obtained by water flux, solute rejection, bubble point, pore size distribution, SEM and AFM analyses. It was found that merely increasing polymer concentration does not necessarily reduce pore size of membranes. Among four solvents used for the dope solution preparation, N-methyl pyrrolidone was found to offer membranes with optimal combination of flux and rejection of various solutes. Some of the PAN(17) (17% w/w PAN concentration in the dope solution) membranes prepared using organic acid as the additive (citric acid, tartaric acid or maleic acid) offered 1.2-1.7 times higher flux than the membrane prepared using inorganic salt, ZnCl2 as an additive. The porosity of PAN(17) membrane prepared using CA as an additive was larger as compared to membrane prepared using ZnCl2 as an additive. Atomic force microscopy (AFM) analysis of this membrane exhibited higher surface roughness as compared to the ZnCl2 based membrane. Both these membranes exhibited bacteria (E. Coli) log reduction value (LRV) of at least 6; depicting applicability of these membrane for water disinfection. (C) 2011 Elsevier B.V. All rights reserved.</p>10aAdditive10aBacteria rejection10aPoly(acrylonitrile)10aPore size distribution10aUltrafiltration1 aLohokare, Harshada, R.1 aBhole, Yogesh, S.1 aTaralkar, Suyog1 aKharul, Ulhas, K.  uhttps://library.ncl.res.in/content/polyacrylonitrile-based-ultrafiltration-membranes-optimization-preparation-parameters-001836nas a2200217   4500008004100000022001400041245011200055210006900167260000900236300001200245490000800257520105800265653001901323653002701342653002901369653002001398100002701418700002701445700002301472856012301495       2018                        eng d  a0376-738800aSolvent and pH-stable poly(2,5-benzimidazole) (ABPBI) based UF membranes: preparation and characterizations0 aSolvent and pHstable poly25benzimidazole ABPBI based UF membrane  cOCT   a743-7510 v5633 a<p>Poly(2,5-benzimidazole), commonly known as ABPBI, is an excellent thermo-chemically stable polymer that is widely evaluated as a proton exchange membrane material in a fuel cell. Its niche intrinsic characteristics could be highly useful in the membrane preparation for various separation applications, especially under harsher environments. To gain insights towards this feasibility, ABPBI based supported membranes were prepared by phase inversion method. Effects of the nonwoven porous support material (polypropylene/polyester), non-solvent (water/0.5 N NaOH) and polymer concentration (6 or 4 wt%) on the membrane properties (water flux, rejection and porosity) were investigated. The stability of these membranes towards common organic solvents, concentrated acid (25 N H2SO4), base (2.5 N NaOH) and an autoclave condition was analyzed. ABPBI membrane showed a pore collapse after drying. In order to avoid this, the glycerol treatment was not only found to be suitable but also repeatable, without significant deviations in the water flux.</p>10aABPBI membrane10aPore size distribution10aSolvent stable membranes10aUltrafiltration1 aLohokare, Harshada, R.1 aChaudhari, Harshal, D.1 aKharul, Ulhas., K.  uhttps://library.ncl.res.in/content/solvent-and-ph-stable-poly25-benzimidazole-abpbi-based-uf-membranes-preparation-and