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    Investigation of process parameters for removal of bisphenol A (BPA) from water by polymeric adsorbents in adsorption-ultrafiltration hybrid system
    (Wiley, 2014) Ipek, Idil Yilmaz; Yuksel, Suna; Kabay, Nalan; Yuksel, Mithat
    BACKGROUNDThe effect of process parameters of a hybrid process integrating adsorption and ultrafiltration in a single system was investigated for bisphenol A (BPA) removal from water. The styrene-divinylbenzene-based, macroporous Purolite MN 202 and Dowex Optipore L493 polymeric adsorbents were employed for adsorption of BPA from water while a ZW-1 model submerged ultrafiltration module was applied in the hybrid system to separate the fine adsorbent particles from treated water. RESULTSAccording to the results obtained using Dowex Optipore L493, the optimum operating conditions to reach minimum BPA concentration in the treated water were found to be: adsorbent concentration 0.5 g-adsorbent L-1-solution, replacement rate of saturated and fresh adsorbents 9 mL min(-1), permeate flow rate 3 mL min(-1), and polymeric adsorbent particle size range 50-100 mu m. CONCLUSIONThe adsorption-ultrafiltration hybrid system is considered as a promising treatment process for removal of BPA from water using highly crosslinked polymeric adsorbents Purolite MN 202 and Dowex Optipore L493. (c) 2014 Society of Chemical Industry.
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    Removal of bisphenol A (BPA) from water by various nanofiltration (NF) and reverse osmosis (RO) membranes
    (Elsevier Science Bv, 2013) Yuksel, Suna; Kabay, Nalan; Yuksel, Mithat
    The removal of an endocrine disrupting compound, bisphenol A (BPA), from model solutions by selected nanofiltration (NF) and reverse osmosis (RO) membranes was studied. The commercially available membranes NF 90, NF 270, XLE BWRO, BW 30 (Dow FilmTech), CE BWRO and AD SWRO (GE Osmonics) were used to compare their performances for BPA removal. The water permeability coefficients, rejection of BPA and permeate flux values were calculated for all membranes used. No significant changes in their BPA removal were observed for all tight polyamide based NF and RU membranes tested except for loose NF 270 membrane. The polyamide based membranes exhibited much better performance than cellulose acetate membrane for BPA removal. Almost a complete rejection (>= 98%) for BPA was obtained with three polyamide based RU membranes (BW 30, XLE BWRO and AD SWRO). But cellulose acetate based CE BWRO membrane offered a low and variable (10-40%) rejection for BPA. (C) 2013 Elsevier B.V. All rights reserved.
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    Water-Soluble Polymer and Photocatalysis for Arsenic Removal
    (Wiley, 2014) Yuksel, Suna; Rivas, Bernabe L.; Sanchez, Julio; Mansilla, Hector D.; Yanez, Jorge; Kochifas, Pia; Kabay, Nalan; Bryjak, Marek
    In this study, the photocatalytic oxidation of hazardous arsenite (As(III)) to arsenate (As(V)) and the sequential removal of arsenate from aqueous solution by liquid-phase polymer-based retention (LPR) were investigated. The photocatalytic oxidation of arsenite was performed using TiO2 (P25 Degussa, Germany) under UV-A light. The optimal photocatalytic conditions to oxidize 10 mg L-1 of arsenite solution were achieved using a 0.5 g L-1 of catalyst at a pH value of 2. The As(III) oxidation reached 100% after 30 min of illumination with UV-A light. A water-soluble polymer containing quaternary ammonium groups, poly(3-acrylamidopropyl) trimethylammonium chloride (P(ClAPTA)), was used as an extracting reagent in the LPR process. To obtain the optimized conditions, the removal experiments were performed at various polymer : As(V) molar ratios using 10 mg L-1 of arsenate solutions. After the oxidation of As(III) to As(V), the removal of arsenate by P(ClAPTA) was obtained in a 99% yield using a 20 : 1 polymer : As(V) molar ratio at a pH value of 9. The results demonstrate that the combination of these methods is highly useful for potential applications related to the treatment of wastewater contaminated with As(III). (C) 2014 Wiley Periodicals, Inc.