Application of Kinetic, Isotherm, and Thermodynamic Models for Atrazine Adsorption on Nanoporous Polymeric Adsorbents

WOS: 000342559200010Adsorption 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.Ege University Research FoundationEge University [2012-MUH-036]This research study was financially supported by Ege University Research Foundation (Project No. 2012-MUH-036)

Modeling of fixed bed column studies for removal of boron from geothermal water by selective chelating ion exchange resins

WOS: 000316040000024The 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.NATO-CLG projectNATO [NATO-CLG-ST.CLG.980131]; TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [CAYDAG 104I096]; Ege University Research FoundationEge University [2004-MUH-026]; EBILTEMEge University [2004-BIL-004]This research study was supported by NATO-CLG project (NATO-CLG-ST.CLG.980131), TUBITAK (Project No.: CAYDAG 104I096), Ege University Research Foundation (Project No.: 2004-MUH-026) and EBILTEM (Project No.: 2004-BIL-004). The authors are also grateful to Mitsubishi Chemical Co., Japan and Dow Chemical, Germany, for providing Diaion CRB 02 and Dowex XUS 43594.00 resins, respectively. Finally, the authors would like to thank Izmir Geothermal Energy Co., Izmir for providing the geothermal water samples

Investigation of process parameters for removal of bisphenol A (BPA) from water by polymeric adsorbents in adsorption-ultrafiltration hybrid system

WOS: 000336508000009BACKGROUNDThe 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.TUBITAK-GSRTTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [109M715]This study has been supported financially by TUBITAK-GSRT (Project Number: 109M715). We would like to thank Purolite Chem. Co., Romania and Dow Chem. Co., USA for providing polymeric adsorbents as gifts

Separation of Boron from Geothermal Water Using a Boron Selective Macroporous Weak Base Anion Exchange Resin

In this study, batch and column mode tests were performed to evaluate the efficiency of boron removal from geothermal water containing 10-11mgB/L using Lewatit MK 51 which is a macroporous weak base anion exchange resin with polyhydroxyl groups showing a very high selectivity and capacity for boron. The optimum resin amount for boron removal from geothermal water was determined as 4.0g resin/L-geothermal water. It was found that the sorption kinetics was influenced by particle size of the resin and temperature. The stirring rate had almost no effect on kinetic performance of the resin. According to the results of column-mode study performed, breakthrough and total capacities of the resin were obtained as 2.75 and 4.98mg/mL-resin, respectively

Deboronation of geothermal water using N-methyl-D-glucamine based chelating resins and a novel fiber adsorbent: batch and column studies

WOS: 000403025500008BACKGROUNDDevelopment of new selective chelating resins and fibers with large capacity, high selectivity and high sorption rate has received great interest particularly for boron removal from water. In this study, batch and column mode tests were performed to evaluate the abilities of boron selective ion exchange resins, Diaion CRB 02 and Diaion CRB 05, as well as a novel chelating fiber Chelest Fiber GRY-HW for boron removal from geothermal water containing boron concentration of 10-11 mg B L-1. RESULTSOptimum adsorbent amounts were found to be 4.0 g resin L-1 geothermal water for Diaion CRB 02, 6.0 g resin L-1 geothermal water for Diaion CRB 05 and 8.0 g fiber L-1 geothermal water for Chelest Fiber GRY-HW. The adsorbents exhibited promising adsorption capacity and their adsorption data for boron agreed well with both Langmuir and Freundlich models. It was found that the sorption kinetics was influenced by particle size of the adsorbents. The rate-determining step for boron separation from geothermal water was found to be particle diffusion. According to the results of the column-mode study, Diaion CRB 05 had a breakthrough capacity of 3.74 mg B mL(-1) resin, whereas Chelest Fiber GRY-HW and Diaion CRB 02 had a breakthrough capacity of 2.16 mg B mL(-1) fiber and 1.66 mg B mL(-1) resin, respectively. CONCLUSIONSThese results showed that boron selective chelating resins along with novel chelating fiber could be employed as efficient adsorbents to decrease boron concentration in geothermal water below the permissible level for irrigation water (<1.0 mg L-1). (c) 2017 Society of Chemical IndustryTUBITAK-JSPS [214 M360]This study has been supported by TUBITAK-JSPS (Project number: 214 M360). We are grateful to Izmir Geothermal Co. for geothermal water samples. We thank Mitsubishi Chemical Co., Japan and Chelest Co., Japan for providing ion exchange resins and Chelest Fiber GRY-HW, respectively. We also thank our diploma project students B.Oflay, N.Demirli, E.Bay, and G.B.Sezer, for their support

Packed bed column dynamic study for boron removal from geothermal brine by a chelating fiber and breakthrough curve analysis by using mathematical models

WOS: 000430523100001In 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.TUBITAK-JSPS [214M360]This study was financially supported by TUBITAK-JSPS (Project number: 214M360). We are grateful to Izmir Geothermal Co. for sampling geothermal brine. We thank to Chelest Co., Japan for providing Chelest Fiber GRY-HW