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

Functional outcome of open reduction and internal fixation for completely unstable pelvic ring fractures (Type C) - A report of 40 cases

Objectives: To evaluate functional outcomes, morbidity and mortality rates, and psychological and psychosomatic status in patients treated for completely unstable pelvic injuries (Tile class C)

Kinetics, Isotherms and Thermodynamics of the Adsorption of Lead(Ii) Lons Onto Porous Mono-Sized Microspheres Possessing Imidazole Functional Groups

Scopu

Beating heart mitral valve replacement with retrograde coronary sinus perfusion technique

Aim. The aim of this study was to assess the efficacy and applicability of on-pump beating heart mitral valve replacement with Sorin Bicarbon prosthesis using retrograde coronary sinus perfusion

Food web effects of titanium dioxide nanoparticles in an outdoor freshwater mesocosm experiment

<p>Over the course of 78 days, nine outdoor mesocosms, each with 1350 L capacity, were situated on a pontoon platform in the middle of a lake and exposed to 0 μg L⁻¹ TiO₂, 25 μg L⁻¹ TiO₂ or 250 μg L⁻¹ TiO₂ nanoparticles in the form of E171 TiO₂ human food additive five times a week. Mesocosms were inoculated with sediment, phytoplankton, zooplankton, macroinvertebrates, macrophytes and fish before exposure, ensuring a complete food web. Physicochemical parameters of the water, nutrient concentrations, and biomass of the taxa were monitored. Concentrations of 25 μg L⁻¹ TiO₂ and 250 μg L⁻¹ TiO₂ caused a reduction in available soluble reactive phosphorus in the mesocosms by 15 and 23%, respectively, but not in the amount of total phosphorus. The biomass of Rotifera was significantly reduced by 32 and 57% in the TiO₂ 25 μg L⁻¹ and TiO₂ 250 μg L⁻¹ treatments, respectively, when compared to the control; however, the biomass of the other monitored groups—Cladocera, Copepoda, phytoplankton, macrophytes, chironomids and fish—remained unaffected. In conclusion, environmentally relevant concentrations of TiO₂ nanoparticles may negatively affect certain parameters and taxa of the freshwater lentic aquatic ecosystem. However, these negative effects are not significant enough to affect the overall function of the ecosystem, as there were no cascade effects leading to a major change in its trophic state or primary production.</p