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- W2034784169 abstract "Abstract Sulfate and selenate adsorption/desorption on γ‐Al2O3 in aqueous suspension were investigated thermodynamically and kinetically. The triple‐layer model fit the experimental data well when adsorbed sulfate and selenate were assumed to form outer‐sphere complexes (SOH2 +‐SO4 2‐ and SOH2 +‐SeO4 2‐). The intrinsic equilibrium constants (Keq int) of the complex were 1010.9 M‐2 for SOH2 +‐SO4 2‐ and 1010.6 M‐2 for SOH2 +‐SeO4 2‐ Pressure‐jump relaxation was used to determine the kinetics of SO4 2‐ and SeO4 2‐ adsorption/desorption on γ‐Al2O3. A single relaxation was observed due to the adsorption/desorption processes. Based on the relaxation theory and combined results of TLM simulations, a single‐step process is proposed. The intrinsic values of the adsorption and desorption rate constants were determined to be k1 int = 2.7 x 108 N‐2S‐1 and k‐1 int = 1.1 x 10‐2 s‐1 in the SO4 2‐/γ‐Al2O3 system and k1 int = 4.3 x 108 M‐2S‐1 and k‐1 int = 4.4 x 10‐2 S‐1 in the SO4 2‐/γ‐Al2O3 system. The intrinsic equilibrium constants from kinetic measurements (Kkin int) were 1010.4 M‐2 for SO4 2‐ and 1010 M‐2 for SeO4 2‐, which were similar to the intrinsic equilibrium constants (Keq int) 1010.9 M‐2 for SO4 2‐ and 1010.6 M‐2 for SeO4 2‐, from the equilibrium studies." @default.
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- W2034784169 date "1999-05-01" @default.
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- W2034784169 title "Kinetics of sulfate and selenate adsorption/desorption onto γ‐AL2O3by the pressure‐jump technique" @default.
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