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• W2037898785 abstract "The adsorption of gentisic acid (GA) by hematite nano-particles was examined under static and dynamic conditions by conducting batch and column tests. To simulate natural sediments, the iron oxide was deposited on 10 μm quartz particles. The GA adsorption was described by a surface complexation model fitted to pH-adsorption curves with GA concentrations of 0.1–1 mM in a pH range of 3–10. The surface was described with one type of site (FeOH°), while gentisic acid at the surface was described by two surface complexes (FeLH2°, log Kint = 8.9 and FeLH−, log Kint = −8.2). Modeling was conducted with PHREEQC-2 using the MINTEQ database. From a kinetic point of view, the intrinsic chemical reactions were likely to be the rate-limiting step of sorption (∼10−3 s−1) while external and internal mass transfer rates (∼102 s−1) were much faster. Under flow through conditions (column), adsorption of GA to hematite-coated sand was about 7-times lower than under turbulent mixing (batch). This difference could not be explained by chemical adsorption kinetics as shown by test calculations run with HYDRUS-1D software. Surface complexation model simulations however successfully described the data when the surface area was adjusted, suggesting that under flow conditions the accessibility to the reactive surface sites was reduced. The exact mechanism responsible for the increased mobility of GA could not be determined but some parameters suggested that decreased external mass transfer between solution and surface may play a significant role under flow through conditions." @default.
• W2037898785 created "2016-06-24" @default.
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• W2037898785 date "2010-06-01" @default.
• W2037898785 modified "2023-09-25" @default.
• W2037898785 title "Reactive transport of gentisic acid in a hematite-coated sand column: Experimental study and modeling" @default.
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• W2037898785 doi "https://doi.org/10.1016/j.gca.2010.03.022" @default.
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