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

BORON REMOVAL FROM GEOTHERMAL WATER BY A NOVEL MONODISPERSE POROUS POLY(GMA-co-EDM) RESIN CONTAINING N-METHYL-D-GLUCAMINE FUNCTIONAL GROUP

WOS: 000307240300003Boron removal from geothermal water and its reverse osmosis (RO) permeate was examined by a novel synthesized monodisperse porous poly(GMA-co-EDM) resin containing N-methyl-D-glucamine. The optimum resin concentration was found to be 4 g L-1 and the kinetic data were found to follow a pseudo-second-order kinetic model. According to the correlation coefficients for diffusional kinetic, the rate controlling step was particle diffusion.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-doctoral fellowship for S. Samatya. We would like to thank Izmir Geothermal Energy Company, Izmir, Turkey for geothermal water samples. We also thank Prof. A. Ozdural, Hacettepe University, for using ICP equipment for boron analysis

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

To 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 µm 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. © 2012 Wiley Periodicals, Inc

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