02003nas a2200241 4500008004100000022001400041245007700055210006900132260006800201300001400269490000800283520114800291653001801439653002301457653003101480653002501511653002001536100002701556700002301583700002201606700002201628856011101650 2006 eng d a0021-899500aSurface modification of polyacrylonitrile based ultrafiltration membrane0 aSurface modification of polyacrylonitrile based ultrafiltration  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcSEP a4378-43850 v1013 a

Ultrafiltration membrane based on polyacrylonitrile prepared by phase inversion method using zinc chloride as an additive showed more than 90% rejection for BSA and 90-110 Im(-2) h(-1) water flux. The surface modification of this membrane was studied using ethanolamine, triethylamine, sodium hydroxide, and potassium hydroxide solutions. The effect of base treatment time and temperature on water flux and rejection was investigated. The membranes exhibited swelling by NaOH treatment followed by deswelling by HCl post-treatment, similar to pH responsive membranes. The treatment by organic as well as inorganic bases improved water flux with a slight lowering in BSA rejection by dead-end mode type treatment. A 230% increase in water flux was achieved by sodium hydroxide treatment in crossflow mode without a noticeable pore swelling by SEM. The contact angle of the modified membranes was decreased as compared to the unmodified one indicating appreciable surface modification. As the treatment time or temperature increased, the ESCA analysis showed increased population of Na-carboxylate groups. (c) 2006 Wiley Periodicals, Inc.

10aBSA rejection10achemical treatment10apolyacrylonitrile membrane10asurface modification10aUltrafiltration1 aLohokare, Harshada, R.1 aKumbharkar, S., C.1 aBhole, Yogesh, S.1 aKharul, Ulhas, K. uhttps://library.ncl.res.in/content/surface-modification-polyacrylonitrile-based-ultrafiltration-membrane-002678nas a2200253 4500008004100000022001400041245009000055210006900145260007300214300001200287490000800299520175800307653002202065653003102087653002402118653002202142653002502164653002002189100002702209700001802236700002302254700002202277856012502299 2008 eng d a0376-738800aEffective arsenic removal using polyacrylonitrile-based ultrafiltration (UF) membrane0 aEffective arsenic removal using polyacrylonitrilebased ultrafilt aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUL a159-1660 v3203 a

Applicability of polyacrylonitrile (PAN)-based negatively charged ultrafiltration (UF) membrane for effective arsenic removal has been demonstrated, to our knowledge, for the first time. The hydrolysis of PAN-based UF membrane surface by NaOH leading to the formation of carboxylate (-COO-) groups and reduction in initial pore size rendered As-V rejection capability by Donnan exclusion principle. A lowering in pore size was indicated by the reduction in water flux and elevation in rejection of protein and polyethylene glycol (PEG). NaOH treatment leading to formation of carboxylate group on the membrane surface was indicated by FTIR-ATR, while contact angle measurement indicated increased hydrophilicity. This treatment rendered membrane surface smoothening as confirmed by SEM and AFM analyses. The molecular weight cut off after the NaOH treatment was found to be similar to 6 kDa. The rejection of pentavalent arsenic (As-V) by these surface modified membranes was studied with different feed concentration, cross-flow velocity, pressure, temperature and pH. Experiments with 50 ppb As-V in feed showed that arsenic rejection was close to 100% and remained constant up to 6 h. Feed sample concentration of 1000 ppb and 50 ppm of As-V showed >95% rejection at pH 7 and room temperature, but for 1000 ppm feed concentration, the rejection was 40-65%. For concentrations <= 50 ppm of arsenic in the feed, the rejection coefficient was not dependent on cross-flow velocity or transmembrame pressure. The rejection for 1000 ppm. concentration of As-V varied from 40 to 65% with variation in the cross-flow velocity and transmembrane pressure as the concentration polarization was important. (C) 2008 Elsevier B.V. All rights reserved.

10aArsenic rejection10aconcentration polarization10across-flow velocity10aPolyacrylonitrile10asurface modification10aUltrafiltration1 aLohokare, Harshada, R.1 aMuthu, M., R.1 aAgarwal, Gopal, P.1 aKharul, Ulhas, K. uhttps://library.ncl.res.in/content/effective-arsenic-removal-using-polyacrylonitrile-based-ultrafiltration-uf-membrane-002308nas 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

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.

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-002031nas a2200289 4500008004100000022001400041245009600055210006900151260007300220300001200293490000800305520105400313653002201367653001401389653001501403653001401418653002201432653002001454100002301474700001501497700001901512700001801531700002401549700002501573700002201598856012101620 2013 eng d a0011-916400aEffect of foulants on arsenic rejection via polyacrylonitrile ultrafiltration (UF) membrane0 aEffect of foulants on arsenic rejection via polyacrylonitrile ul aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN a243-2460 v3093 a

Arsenic rejection via modified polyacrylonitrile ultrafiltration (UF) membrane was found to be very high, however, the presence of commonly found foulants in arsenic solution affected membrane performance. The effect of commonly found foulants, such as ovalbumin, humic acid and egg white on arsenic rejection were studied. Experiments indicated that the As(V) rejection was affected by the total quantity of proteins and not the variety of proteins present in a solution. As(V) rejection was found to decrease with increasing proteins while fouling was found to increase from 25% for 0.1 mg/ml to 33% for 0.5 mg/ml egg white. The As(V) rejection was found to decrease with increasing concentration of humic acid for PAN membranes. Fouling studies showed that humic acid was a lesser foulant in comparison to egg white. However a combination of the two foulants led to a decrease in the overall fouling. pH was also found to be a very important factor for egg white dissolution and As(V) rejection. (C) 2012 Elsevier B.V. All rights reserved.

10aArsenic rejection10aEgg white10aHumic acid10aOvalbumin10aPolyacrylonitrile10aUltrafiltration1 aAgarwal, Gopal, P.1 aKaran, Raj1 aBharti, Sachin1 aKumar, Hemant1 aJhunjhunwala, Sumit1 aSreekrishnan, T., R.1 aKharul, Ulhas, K. uhttps://library.ncl.res.in/content/effect-foulants-arsenic-rejection-polyacrylonitrile-ultrafiltration-uf-membrane-002354nas a2200253 4500008004100000022001400041245012100055210006900176260007300245300001000318490000800328520141600336653003401752653002201786653001401808653002201822653002001844100002301864700001801887700002201905700001901927700002201946856013201968 2014 eng d a0011-916400aPBI-BuI and PAN-PSSALi based UF membranes: effects of solute and membrane surface interactions on rejection and flux0 aPBIBuI and PANPSSALi based UF membranes effects of solute and me aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN a45-510 v3333 a

Ultrafiltration membrane using tert-butylpolybenzimidazole (PBI-BuI) was prepared and characterized for flux and rejection performance using Gel Permeation Chromatography (GPC). Polyethylene glycol (PEG) and polyethylene oxide (PEO) with different molecular weights were used as the solutes. While using feed solution containing mixture of PEGs, higher rejection was observed than using individual PEG. The water flux of PBI-BuI membrane after passing individual PEG solutions showed considerable (similar to 36%) reduction, which could be attributable to the PEG adsorption on the membrane pore surface. PEG adsorption was further substantiated by SEM, IR and TGA. The amphoteric nature of PBI-BuI could cause H-bonding between membrane surface and PEG molecules, leading to PEG adsorption on the membrane and pore surface. To ascertain this postulation, a study with PAN-PSSALi (which does not contain H-bonding) based UF membrane containing negatively charged -SO3- group was done. It was found that PEG adsorption in this case is not as predominant as in earlier case. This membrane showed marginal reduction in water flux of 8%, vis-a-vis 36% reduction shown by PBI-BuI based membrane. This indicated that H-bonding present in PBI-BuI is mainly responsible for the PEG adsorption on its membrane and pore surface, in spite of PEG being a neutral molecule. (C) 2013 Elsevier B.V. All rights reserved.

10aGel permeation chromatography10aPolybenzimidazole10aRejection10aSolute adsorption10aUltrafiltration1 aBhagat, Deepti, G.1 aMule, Bhavana1 aMandlekar, Neeraj1 aPandare, Kiran1 aKharul, Ulhas, K. uhttps://library.ncl.res.in/content/pbi-bui-and-pan-pssali-based-uf-membranes-effects-solute-and-membrane-surface-interactions-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

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.

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