Adsorption from aqueous solution by δ‐manganese dioxide I. Adsorption of the alkaline‐earth cations
作者： Malcolm J. Gray , Mounir A. Malati
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摘要: The adsorption isotherms of M2+ ions (M = Mg, Ca, Sr or Ba) were determined at pH 7.0 and different temperatures. adsorbent, δ-MnO2, was converted to the K+ form prior about 1.5 mol released per adsorbed. capacity a given temperature increased in series: Mg2+ Ca2+ > Sr2+ Ba2+. values below point zero charge (pH 3.3) significant for only. Although not strictly reversible, results fitted Langmuir isotherm ‘apparent heats adsorption’, Q, calculated. endothermic (Q 20,18, 11 5 kJ mol−1 Mg2+, Ca2+, Ba2+ respectively) indicated positive entropy contributions which are expected mechanism suggested. decrease Q down alkaline-earth group correlated effects hydration numbers cations.
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