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

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

Removal of fluoride from water by metal ions (Al3+, La 3+ and ZrO2+) loaded natural zeolite

In this study, the ion exchange of metal ions (Al3+, La3+ and ZrO2+) on modified zeolites was carried out using batch method. Fluoride removal from water using Al3+-, La3+- and ZrO2+- exchanged zeolite was subsequently investigated to evaluate the fluoride sorption characteristics of the sorbents. Natural zeolite samples (45m) were pre-conditioned with HNO3 solution (ZEO-1), NaNO3 solution (ZEO-2), and deionized water (ZEO-3) before loading Al3+, La3+, and ZrO2+ on zeolite. ZEO-1 type zeolite had a higher capacity than ZEO-2 and ZEO-3 type zeolites. Metal exchange capacities are 0.233, 0.089, 0.090mmol/g for ZrO2+-, La3+-, and Al3+- exchanged zeolite (ZEO-1), respectively. Equilibrium isotherms fitted well to Langmuir and Freundlich models. Percent removal of fluoride from aqueous solution containing 2.5mg F/L was 94% using metal loaded zeolite (ZEO-1 type) at an adsorbent concentration of 6.00g/L.Firat University Scientific Research Projects Management Unit: 2004-FEN-070This study was supported by Ege University Scientific Research Projects Commission (Project Number: 2004-FEN-070). We acknowledge Profs. E. Henden and A. C¸ elik for discussions. We also thank M. Akc¸ay for his kind help for the metal ions analyses by AAS. We thank Assoc. Prof. M. Kitis for providing us with a tap water sample. -