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Zeolitas naturales como adsorbente de urea Translated title: Natural zeolite as adsorbent of urea

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      Abstract

      Una zeolita phillipsita natural iraní fue caracterizada mediante las técnicas analíticas usuales: difracción de rayos X (DRX), infrarrojo con transformada de Fourier FT-IR, y medidas de área específica superficial BET. Esta zeolita phillipsita fue puesta en contacto con diferentes concentraciones de la toxina urémica urea. Después del contacto con las soluciones de urea, se aplicaron distintos modelos de adsorción, tales como: Langmuir, Freundlich y Langmuir-Freundlich, con el propósito de comparar los mejores ajustes de cada una de ellas. Los resultados revelaron una etapa inicial de la formación de la monocapa para dar luego con la formación de multicapa que se corresponde con el sistema de Langmuir-Freundlich.

      Translated abstract

      An Iranian natural phillipsite zeolite was characterized by different techniques such as: X-ray diffraction, Fourier- Transformed spectroscopy (FT-IR) and BET specific surface area measurements. The phillipsite zeolite was contacted with urea solutions of different concentrations. After the contacting, different adsorption models were assessed such as: Langmuir, Freundlich y Langmuir-Freundlich. Results showed the formation of a urea monolayer, at an early stage and finally a urea multilayer was formed, in concordance with the Langmuir-Freundlich model.

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      Adsorption properties of zeolites for artificial kidney applications

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        Adsorption of the uremic toxin p-cresol onto hemodialysis membranes and microporous adsorbent zeolite silicalite.

        Para-cresol CH3C6H4OH is a protein-bound solute which is not eliminated efficiently by hemodialysis systems. In this study, we present adsorption of p-cresol as a complementary process to hemodialysis. The kinetics and isotherms of adsorption onto cellulose-based membranes (cellulose diacetate and triacetate), synthetic membranes (polyamide, polysulfone, polyacrylonitrile and polymethylmethacrylate) and microporous zeolite silicalite (MFI), have been evaluated in static conditions. The results indicate that p-cresol has a low affinity to all membranes but polysulfone and polyamide and that the times to reach equilibrium conditions are slow. In contrast, equilibration time on silicalite is fast (2 min to eliminate 90%) while adsorption levels are high (maximum adsorption about 106 mg g(-1)). Adsorption onto microporous adsorbents could be a novel way to eliminate uremic toxins from blood.
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          The Merk manual

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            Author and article information

            Affiliations
            [1 ] Universidad de Carabobo
            [2 ] University of Teheran, Islamic Azad University Iran
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Role: ND
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            Journal
            rfiucv
            Revista de la Facultad de Ingeniería Universidad Central de Venezuela
            Rev. Fac. Ing. UCV
            Universidad Central de Venezuela (Caracas )
            0798-4065
            September 2014
            : 29
            : 3
            : 83-88
            S0798-40652014000300009

            http://creativecommons.org/licenses/by/4.0/

            Product
            Product Information: SciELO Venezuela
            Categories
            ENGINEERING, MULTIDISCIPLINARY

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