196 research outputs found

    THE ADSORPTION OF NITROPHENOLS ON A SPECIAL ADSORBENT PREPARED FROM GLASS POWDER

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    The adsorption of nitrophenols on the various particle size of adsorbents prepared from glass powder were investigated by using UV spectrophotometer

    Adsorptive Removal of Strontium by Binary Mineral Mixtures of Montmorillonite and Zeolite

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    The adsorption characteristics of montmorillonite and zeolite minerals and their mixtures for Sr removal have been studied by means of a radiotracer technique using the Sr-90 isotope. Experimentally measured distribution coefficients for both single and binary adsorbent systems are in agreement with mathematically calculated values. Adsorption capacities for Sr calculated from Dubinin-Radushkevich isotherm parameters increase with increasing zeolite fraction in binary mixtures, whereas they decrease in the presence of NaCl with respect to pure SrCl2 solutions. Thermodynamic parameters have been estimated from the temperature dependency of the adsorption equilibrium constants evaluated from the selectivity coefficients in brines. Results show that Sr adsorption is an endothermic process, but the spontaneity of adsorption increases with increasing zeolite fraction and temperature. A site distribution function has been mathematically calculated by using the Freundlich isotherm parameters, which gives valuable information about the affinity of exchange sites on the adsorbents for binary exchange between Sr and Na

    Adsorption behavior of strontium on binary mineral mixtures of Montmorillonite and Kaolinite

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    The adsorption behavior of kaolinite and montmorillonite minerals and their mixtures in respect of Sr ion were studied by means of a batch method using Sr-90 as a radio tracer. The effect of several parameters such as temperature, pH, Sr concentration and supporting electrolyte were investigated. Experimentally measured distribution coefficients showed a good agreement to within 98.5-99.7% with theoretically calculated values. The values of adsorption capacity of adsorbents and mean adsorption energy of adsorption were calculated by fitting the adsorption data to Dubinin-Radushkevich isotherm. The adsorption capacity of clay mixtures decreased as kaolinite fractions increased. The mean adsorption energy values of 8.0-9.5 kJ mol(-1) showed that adsorption was governed by ion exchange. The Freundlich parameters were used to characterize a site distribution function for binary exchange between Sr and Na. (c) 2006 Elsevier Ltd. All rights reserved
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