Removal of Boron from aqueous solutions by using chelating ion exchange resins

Sulardaki bor'un giderilmesi, dünyayı ilgilendiren bir konudur.Tarım arazilerinde kullanılan sularda bor için izin verilen sınır derişim değeri 1 mgB/L'dir.Bor miktarı bu değerin üzerinde olduğunda bazı bitkiler için toksik olmaktadır.Kızıldere jeotermal atık suyundaki bor konsantrasyonu yaklaşık olarak 18-20 mgB/L düzeyindedir.Bu çalışmada, jeotermal atık sulardaki bor'un iyon değiştirme yöntemiyle giderilmesi incelenmiştir.Laboratuarda yürütülen kesikli ve sürekli işlemler,farklı pH'larda hazırlanmış model çözeltiler ve jeotermal atık sular kullanılarak gerçekleştirilmiştir.Bu çalışmalarda, N-glucamin fonksiyonel gruplarını içeren şelatlayıcı iyon değiştirici reçineler (Diaion CRB 01 ve Purolite S 108) bor giderilmesi için kullanılmıştır.Bor bu reçinelerden %5'lik H2SO4 çözeltisi kullanarak nicel olarak tamamen sıyrılabilmiştir.Bor analizleri, spektrofotometrik olarak Curcumin yöntemiyle gerçekleştirilmiştir

Monodisperse-porous N-methyl-D-glucamine functionalized poly(vinylbenzyl chloride-co-divinylbenzene) beads as boron selective sorbent

WOS: 000307005300033To generate a new sorbent with high boron adsorption capacity, we synthesized monodisperse-porous poly(vinylbenzyl chloride-co-divinylbenzene), poly(VBC-co-DVB), beads 8.5 mu m in size by a new modified seeded polymerization technique. By using their chloromethyl functionality, the beads were derivatized by a simple, direct reaction with a boron-selective ligand, N-methyl-D-glucamine (NMDG). The selection of poly(VBC-co-DVB) beads as a starting material allowed to obtain high boron sensitive-ligand density on the beads depending on their high chloromethyl content. In the batch adsorption runs performed using NMDG-attached poly(VBC-co-DVB) beads as sorbent, boron removal was efficiently performed in a wide pH range between 4 and 11. Quantitative boron removal was observed with the sorbent concentration of 4 g/L. In the same runs, plateau value of equilibrium adsorption isotherm was obtained as 14 mg boron/g beads. Relatively higher boron adsorption was explained by high ligand density and high specific surface area of the sorbent. Boron adsorption isotherms were analyzed using Langmuir and Freundlich models. In the kinetic runs performed for boron removal, the equilibrium was attained within 10 min at a value of 98%. The fast kinetic behavior was explained by the smaller particle size and enhanced porosity of the new sorbent. Infinite solution volume model and unreacted core model were used to evaluate boron adsorption onto the NMDG-attached poly(VBC-co-DVB) beads. The results indicated that the adsorption process is controlled by the particle-diffusion step. (c) 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012BORENMinistry of Energy & Natural Resources - Turkey [2008-G-0192]; TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)Contract grant sponsor: BOREN; contract grant number: Project Number: 2008-G-0192.; The authors are grateful to TUBITAK for postdoctorate fellowship for Dr. Saba Samatya. The authors also thank Prof. Ahmet R. Ozdural, Hacettepe University for boron analysis

Comparison of newly developed hydroxyl- functionalized monodisperse HILIC columns new HILIC column

In this study, new hydroxyl-functionalized monodisperse polymeric hydrophilic interaction chromatography (HILIC) columns were developed using different derivatization agents. In addition, the influences of derivatization temperature of the best agent and polymer composition on the separation were investigated under HILIC conditions. Monodisperse–porous hydrophilic particles were synthesized by the seeded polymerization method using 3-chloro-2-hydroxypropile methacrylate (HPMA-CL) and ethylene glycol dimethacrylate (EGDMA) monomers. The chloropropyl terminal ends of the poly(HPMA-Cl-coEGDMA) particles were derivatized with amine group of ethanolamine (EA), diethanolamine, and triethanolamine (TEA) at 80°C through nucleophilic reaction. The performance of synthesized particles was evaluated with the amount of ligand on the particle surfaces, column backpressure, and separation power under HILIC condition. TEA was found to be the best derivatization agent for the separation of toluene, acrylamide, thymine, adenine, and cytosine in respect to resolution factors (>1.5 for all analytes) and theoretical plate numbers (64.562 N/m for acylamide). Upon determination of the best ligand, then the effect of different derivatization temperatures and polymer composition on TEA performance was investigated. Of all the tested polymer compositions, the chromatographic performance of TEA-M-80 (the derivatization of TEA at 80°C together with M polymer composition) was found to be the best

Boron removal from RO permeate of geothermal water by monodisperse poly(vinylbenzyl chloride-co-divinylbenzene) beads containing N-methyl-D-glucamine

WOS: 000353094300009Novel boron selective chelating resins were synthesized using monodisperse porous poly(VBC-co-DVB) beads by further functionalization with N-methyl-D-glucamine (NMDG) groups. The performance of the resins for boron removal from geothermal water and its reverse osmosis (RO) permeate has been studied using a batch sorption method. It was possible to remove about 93% of boron from geothermal water containing 11.0 mg B/L with 4 g/L of monodisperse functionalized polymer beads. The respective value for RO permeate of geothermal water with 4.8-5A mg B/L of concentration was 97% with the same amount of chelating resin. The sorption rate of boron was quite rapid. A sorption equilibrium was reached in 20 min for geothermal water and in 10 min for RO permeate. The kinetic data obtained were evaluated using classical kinetic models and diffusion/reaction models. It was concluded that monodisperse chelating resins obeyed pseudo-second order kinetic model. Also, the rate controlling step of boron sorption was mostly particle diffusion along with chemical reaction. (C) 2014 Elsevier B.V. All rights reserved.National Boron Research Institute, BORENMinistry of Energy & Natural Resources - Turkey [2008-G-0192]; TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)This work was supported financially by the National Boron Research Institute, BOREN (Project Number: 2008-G-0192). We are grateful also to TUBITAK for the post-doc fellowship to Dr. S. Samatya. We thank Prof. Dr. A. Ozdural for the kind permission to use ICP-MS in his laboratory for boron analyses

Comparative boron removal performance of monodisperse-porous particles with molecular brushes via "click chemistry" and direct coupling

WOS: 000285662500016A new sorbent based on micron-size, monodisperse-porous particles is proposed for boron removal by a hybrid process involving "adsorption" and "membrane separation". In the synthesis of sorbent, a multi-stage polymerization protocol involving the production of monodisperse polymer particles and the generation of dextran based molecular brushes on the particles via "click chemistry" was followed. The monodisperse porous poly(glycidyl methacrylate-co-ethylene dimethacrylate), poly(GMA-co-EDM), particles 6 mu m in size were obtained by "modified seeded polymerization". Dextran was attached onto the particles via "click chemistry". In this derivatization, the azide groups were obtained on the particles by the reaction between NaN3 and the epoxypropyl functionality. An alkyne carrying ligand, propiolic acid was covalently linked to the dextran via activation with a water soluble carbodiimide. The molecular brushes on the particle surface were then obtained by clicking alkyne modified-dextran onto the azide functionalized particles. A second sorbent was synthesized by the direct covalent attachment of dextran onto the poly(GMA-co-EDM), particles. Boron sorption capacities of both sorbents were investigated using model boron solutions and compared with the commercial resins. Monodisperse-porous particles with dextran based molecular brushes can be used for boron-removal from water. (C) 2010 Elsevier B.V. All rights reserved.BORENMinistry of Energy & Natural Resources - Turkey [2008-G-0192]; TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)This work was supported financially by BOREN (Project Number: 2008-G-0192). We are grateful to TUBITAK for post doc fellowship for S. Samatya

Utilization of geothermal water as irrigation water after boron removal by monodisperse nanoporous polymers containing NMDG in sorption-ultrafiltration hybrid process

A relatively new method of polymerization, 'modified seeded polymerization' has been used for the synthesis of monodisperse nanoporous poly(glycidyl methacrylate-co-ethylene dimethacrylate) and poly(vinylbenzyl chloride-co-divinylbenzene) beads. The synthesized polymer beads were then functionalized with N-methyl-D-glucamine (NMDG) to obtain boron selective resins. The efficiency of these particles for boron removal from geothermal water was investigated by using the hybrid process coupling sorption with ultrafiltration (UF) method where a submerged hollow fiber type UF membrane module was employed for filtration. It was possible to reduce the boron concentration from 11.0 mg/L to <= 1 mg/L in 20 min with hybrid method using poly(glycidyl methacrylate-co-ethylene dimethactylate)-NMDG beads with 4 g-resin/L-geothermal water. The respective period for poly(vinylbenzyl chloride-co-divinylbenzene) beads with the same resin dosage was 30 min. In the case of commercially available boron selective ion exchange resin Dowex-XUS 43594.00 ground to an average particle size of 20 pm, the target boron concentration which is mg/L was reached in 20 mm by using 2 g-resin/L-geothermal water. (C) 2015 Elsevier B.V. All rights reserved

Utilization of geothermal water as irrigation water after boron removal by monodisperse nanoporous polymers containing NMDG in sorption-ultrafiltration hybrid process

WOS: 000353094300007A relatively new method of polymerization, 'modified seeded polymerization' has been used for the synthesis of monodisperse nanoporous poly(glycidyl methacrylate-co-ethylene dimethacrylate) and poly(vinylbenzyl chloride-co-divinylbenzene) beads. The synthesized polymer beads were then functionalized with N-methyl-D-glucamine (NMDG) to obtain boron selective resins. The efficiency of these particles for boron removal from geothermal water was investigated by using the hybrid process coupling sorption with ultrafiltration (UF) method where a submerged hollow fiber type UF membrane module was employed for filtration. It was possible to reduce the boron concentration from 11.0 mg/L to <= 1 mg/L in 20 min with hybrid method using poly(glycidyl methacrylate-co-ethylene dimethactylate)-NMDG beads with 4 g-resin/L-geothermal water. The respective period for poly(vinylbenzyl chloride-co-divinylbenzene) beads with the same resin dosage was 30 min. In the case of commercially available boron selective ion exchange resin Dowex-XUS 43594.00 ground to an average particle size of 20 pm, the target boron concentration which is mg/L was reached in 20 mm by using 2 g-resin/L-geothermal water. (C) 2015 Elsevier B.V. All rights reserved.National Boron Research Institute, BORENMinistry of Energy & Natural Resources - Turkey [2008-G-0192]; TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)This work was supported financially by the National Boron Research Institute, BOREN (Project Number: 2008-G-0192). We are grateful also to TUBITAK for the post-doc fellowship to Dr. S. Samatya. We thank E. Guler for the kind help to run hybrid tests. We thank Dow Chemical Co. for sending us boron selective resins Dowex-XUS-43594.00 as a gift