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    Application of adsorption-ultrafiltration hybrid method for removal of phenol from water by hypercrosslinked polymer adsorbents
    (Elsevier Science Bv, 2012) Ipek, Idil Yilmaz; Kabay, Nalan; Yuksel, Mithat; Yapici, Duygu; Yuksel, Umran
    This study will provide a solution to the discharge of phenol containing water and wastewater problem. This could be achieved through the development of a treatment process based on the combination of adsorption and membrane filtration processes. In this study, the efficiency of phenol removal from model phenol solution was investigated using Purolite MN 200 and Purolite MN 202 hypercrosslinked macronet polymer adsorbents by using only adsorption and adsorption-ultrafiltration hybrid processes. In order to remove phenol with a percent removal of about 90% from aqueous solution, optimum amount of adsorbent was found to be 0.1 g-adsorbent/50 mL-solution and 0.2 g-adsorbent/50 mL-solution for Purolite MN 200 and Purolite MN 202, respectively. According to the results of kinetic study, phenol removal rate was found to be higher when the particle size of Purolite MN 200 is smaller due to increased surface area. The results of the hybrid system showed that the optimum operating conditions to meet the goal of discharge limit of phenol containing water by Purolite MN 200 were found when the adsorbent concentration is 3 g/L, flow rate of suspensions of saturated and fresh adsorbents 6 mL/min, and flow rate of feed and permeate 3 mL/min. Finally, the performance of Purolite MN 202 adsorbent used in adsorption-ultrafiltration hybrid system showed much promising removal rate than that of Purolite MN 200 polymer adsorbent for phenol removal. (C) 2012 Elsevier B.V. All rights reserved.
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    Application of Kinetic, Isotherm, and Thermodynamic Models for Atrazine Adsorption on Nanoporous Polymeric Adsorbents
    (Taylor & Francis Inc, 2014) Ipek, Idil Yilmaz
    Adsorption of atrazine on nanoporous polymeric adsorbents, PAD 400 and PAD 610, was investigated. The effect of particle size, pH, ionic strength, and temperature along with kinetic, equilibrium, and thermodynamic studies reveal the efficiency of PAD 400 with a higher adsorption capacity than PAD 610. The equilibrium data obey the Freundlich isotherm and the kinetic data were well described by the pseudo-second-order model. Spontaneous, endothermic, and random characteristics of the process were confirmed by thermodynamic analysis.
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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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    Modeling of fixed bed column studies for removal of boron from geothermal water by selective chelating ion exchange resins
    (Elsevier Science Bv, 2013) Ipek, Idil Yilmaz; Kabay, Nalan; Yuksel, Mithat
    The efficiency of boron removal from geothermal water was investigated using boron selective ion exchange resins Diaion CRB 02 and Dowex (XUS 43594.00) in a fixed-bed column. The effect of pH and feed flow rate on boron removal from geothermal water was additionally tested using Dowex (XUS 43594.00) resin. Yoon-Nelson and Thomas models were applied to the experimental data to predict the breakthrough curves and model parameters such as rate constants and breakthrough times. The results showed that the models describe the breakthrough curves quite well compared with the all experimental data. Similarly, the model predictions for q(0) obtained both by Yoon-Nelson and Thomas models greatly fit with the experimental results for all conditions and for both boron selective ion exchange resins. (C) 2012 Elsevier B.V. All rights reserved.
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    Modeling of fixed bed column studies for removal of boron from geothermal water by selective chelating ion exchange resins
    (Elsevier Science Bv, 2013) Ipek, Idil Yilmaz; Kabay, Nalan; Yuksel, Mithat
    The efficiency of boron removal from geothermal water was investigated using boron selective ion exchange resins Diaion CRB 02 and Dowex (XUS 43594.00) in a fixed-bed column. The effect of pH and feed flow rate on boron removal from geothermal water was additionally tested using Dowex (XUS 43594.00) resin. Yoon-Nelson and Thomas models were applied to the experimental data to predict the breakthrough curves and model parameters such as rate constants and breakthrough times. The results showed that the models describe the breakthrough curves quite well compared with the all experimental data. Similarly, the model predictions for q(0) obtained both by Yoon-Nelson and Thomas models greatly fit with the experimental results for all conditions and for both boron selective ion exchange resins. (C) 2012 Elsevier B.V. All rights reserved.
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    Packed bed column dynamic study for boron removal from geothermal brine by a chelating fiber and breakthrough curve analysis by using mathematical models
    (Elsevier Science Bv, 2018) Recepoglu, Yasar K.; Kabay, Nalan; Ipek, Idil Yilmaz; Arda, Muserref; Yuksel, Mithat; Yoshizuka, Kazuharu; Nishihama, Syouhei
    In this study, the performance of N-methyl-D-glucamine (NMDG) type functional group attached a novel boron selective chelating fiber adsorbent, Chelest Fiber GRY-HW, was investigated for boron removal from geothermal brine containing 10-11 mg B/L through a packed bed column. The effect of feed flow rate (Space Velocity, SV) on breakthrough capacity of Chelest Fiber GRY-HW was studied using various SV values (15, 20 and 30 h(-1)). The effect of SV on breakthrough capacity was particularly apparent when SV was decreased from 30 to 15 h(-1). Yoon-Nelson, Thomas and Modified Dose Response (MDR) models were applied to the experimental data to estimate the breakthrough curves and model parameters such as rate constants and breakthrough times. The obtained results showed that the breakthrough curves were better described by Modified Dose Response (MDR) model than those described by Yoon-Nelson and Thomas models in each case. Also, the model estimations for adsorption capacity obtained by MDR model agreed well with the experimental results.
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    Polymer-enhanced ultrafiltration-electrodeionization hybrid system for the removal of boron
    (Royal Soc Chemistry, 2023) Soysuren, Gulsev; Ipek, Idil Yilmaz; Arda, Muserref; Arar, Ozgur
    The consumption of ultrapure water (UPW) is continuously increasing owing to its numerous applications. In the production line of UPW using ion exchange resins, boron is usually found in the product water. Therefore, an optimized system is required for the efficient removal of boron. In this work, a hybrid system consisting of polymer-enhanced ultrafiltration (PEUF) and electrodeionization (EDI) was developed for boron removal from aqueous solutions. PEUF was used as a pretreatment step to reduce the boron concentration and thus improve the performance of the EDI system. In the pretreatment step, the polymer/boron ratio, the solution pH, and the contact time were optimized to achieve a boron removal rate of 68% by PEUF. The pretreated solution was then transferred to the EDI cell. During the EDI removal of boron, the removal rate was affected by the applied voltage and the flow rate but not by changes in the conductivity of the Na2SO4 solution in the electrode compartment. The optimum removal rate was achieved at an applied voltage of 30 V and a flow rate of 2 L h(-1). Increasing the operating time from 3 to 10 h and the number of stacks in the EDI cell improved the removal rate to more than 99.9%. The results show that the PEUF-EDI system constitutes a promising approach to reduce the boron concentration in UPW.
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    Production and Evaluation of Floating Photocatalytic Composite Particles Formed Using Pickering Emulsions and Membrane Emulsification
    (Amer Chemical Soc, 2012) Holdich, Richard G.; Ipek, Idil Yilmaz; Lazrigh, Manal; Shama, Gilbert
    Floating photocatalytic composite particles were created by injecting a lipid (sunflower oil or liquefied cocoa butter) into an aqueous suspension of TiO2 nanoparticles using the process of membrane emulsification to control the (Pickering) emulsion size. The composite particle median diameters were controlled in a range from 80 to 300 mu m. The composite particles floated in water and possessed photocatalytic activity, which was further enhanced by chemically incorporating silver particles into the TiO2 shell. The cocoa butter-based composite particles proved more robust and were not affected by the UV photocatalytic process. Using a combination of cocoa butter and hexane, for the core of the particles, it was possible to generate composite TiO2 and lipid particles with 36 mg of TiO2 per gram of particle. Optimal dye decolorization was achieved with a particle surface coverage of between 60 and 80%. Complete surface coverage resulted in a reduced reaction rate due possibly to reflection of the UV light.
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    Removal of boron by boron selective resin-filled electrodeionization
    (Elsevier, 2021) Saricicek, Esma Nur; Tugac, Mimmet Mert; Ozdemir, Vedat Tolga; Ipek, Idil Yilmaz; Arar, Ozgur
    Boron exists in the earth's crust mainly in the form of borates or boric acid. Boric acid is a weak electrolyte and does not completely dissociate in aqueous solutions. Due to such features, it is not always possible to remove it efficiently by conventional water treatment technologies. In this work, it is the first time of the usage of boron selective resin-filled electrodeionization (EDI) to remove boron from aqueous solutions. While the experiments were carried out in constant voltage mode, however it was revealed that the applied potential and feed flow rate have significant effects on boron removal. On the other hand, variation in the electrolyte conductivity did not result in any notable changes in the boron removal efficiency. The removal performance of the boron selective resin-filled EDI cell was evaluated by calculation of flux, mass transfer coefficient, and power consumption. The results demonstrated that the feed flow rate has a significant effect on the mass transfer coefficient and flux of boron. The mass transfer coefficient of boron is found to be 7.78 x 10(-4) m/s which is much higher than previously reported values in the literature. The energy consumption of boron selective resin-filled-EDI was in the range of 6.64 x 10(-3)-1.11 x 10(-1) Wh/g. The boron concentration in the solution decreased from 5 mg/L to 0.3 mg/L with a boron removal rate up to 94%. (C) 2021 Elsevier B.V. All rights reserved.
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    Removal of boron from geothermal water by a novel boron selective resin
    (Elsevier, 2013) Santander, Paola; Rivas, Bernabe L.; Urbano, Bruno F.; Ipek, Idil Yilmaz; Ozkula, Gulsah; Arda, Muserref; Yuksel, Mithat; Bryjak, Marek; Kozlecki, Tomasz; Kabay, Nalan
    In this study, a novel chelating resin poly(N-(4-vinylbenzyl)-N-methyl-o-glucamine) (P(VbNMDG)) was synthesized. The sorption performance of this resin was compared with boron selective commercial resin Diaion CRB02 containing N-methyl-n-glucamine (NMDG) groups for boron removal from geothermal water. The P(VbNMDG) resin gave a higher sorption capacity and faster kinetics than that of Diaion CRB02 for boron removal from geothermal water. The kinetic data obtained were evaluated using classical kinetic models and diffusion/reaction models. It was concluded that both P(VbNMDG) and Diaion CRB02 resins obeyed pseudo second order kinetic model. Also, the rate controlling step of boron sorption was particle diffusion for both resins. The breakthrough profile of P(VbNMDG) resin for boron was sharper than that of Diaion CRB02. Thus, the degree of the column utilization of P(VbNMDG) resin was also high. The boron loaded on both resins was eluted using 5% H2SO4 solution with a percentage of around 80%. (C) 2012 Elsevier B.V. All rights reserved.
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    Removal of boron from geothermal water by a novel boron selective resin
    (Elsevier, 2013) Santander, Paola; Rivas, Bernabe L.; Urbano, Bruno F.; Ipek, Idil Yilmaz; Ozkula, Gulsah; Arda, Muserref; Yuksel, Mithat; Bryjak, Marek; Kozlecki, Tomasz; Kabay, Nalan
    In this study, a novel chelating resin poly(N-(4-vinylbenzyl)-N-methyl-o-glucamine) (P(VbNMDG)) was synthesized. The sorption performance of this resin was compared with boron selective commercial resin Diaion CRB02 containing N-methyl-n-glucamine (NMDG) groups for boron removal from geothermal water. The P(VbNMDG) resin gave a higher sorption capacity and faster kinetics than that of Diaion CRB02 for boron removal from geothermal water. The kinetic data obtained were evaluated using classical kinetic models and diffusion/reaction models. It was concluded that both P(VbNMDG) and Diaion CRB02 resins obeyed pseudo second order kinetic model. Also, the rate controlling step of boron sorption was particle diffusion for both resins. The breakthrough profile of P(VbNMDG) resin for boron was sharper than that of Diaion CRB02. Thus, the degree of the column utilization of P(VbNMDG) resin was also high. The boron loaded on both resins was eluted using 5% H2SO4 solution with a percentage of around 80%. (C) 2012 Elsevier B.V. All rights reserved.
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    Removal of Cr(VI) by a chelating resin containing N-methyl-d-glucamine
    (Springer, 2014) Paola Santander, I.; Rivas, Bernabe L.; Urbano, Bruno; Leiton, Lorena; Ipek, Idil Yilmaz; Yuksel, Mithat; Kabay, Nalan; Bryjak, Marek
    The resin poly[N-(4-vinylbenzyl)-N-methyl-d-glucamine] [P(VbNMDG)] was synthesized and its performance for Cr(VI) removal was studied. This resin presented a very fast kinetic of Cr(VI) sorption following a pseudo-second order. Also, the rate-controlling step of Cr(VI) sorption performed by film diffusion in accordance with infinite solution volume model and reacted layer in accordance with unreacted core model. The column study showed a breakthrough capacity of 12.2 mg Cr/mL-resin, with an elution efficiency of 92 %. Mechanism of sorption could correspond to an electrostatic interaction followed by a complexation reaction.