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• W1967291567 abstract "The impacts of the biomolecule‐induced structural perturbation of Al hydroxides and the resultant alteration of their surface reactivity toward the adsorption of nutrients and contaminants have received, to date, scant attention, in spite of their significance in determining the mineralogy and surface chemistry of these mineral colloids. This study investigated the equilibria and kinetics of As(V) adsorption on a crystalline Al hydroxide, a pure amorphous Al hydroxide and a short‐range ordered Al–tannate coprecipitate. Isotherms and kinetics of As(V) adsorption were conducted at pH 6.5; the kinetic experiments (0.083–24 h) were performed at 288, 298, 308, and 318 K. The adsorption data followed multiple second‐order kinetics, with an initial fast reaction step, followed by a slow reaction. While As(V) adsorption on the crystalline Al hydroxide was a rapid process, the poorly ordered minerals required longer contact intervals and greater activation energies. Compared with the pure amorphous Al hydroxide, the incorporation of tannate into the structural network of Al hydroxide decreased the adsorption rate, capacity, and affinity for As(V). These effects were attributable to the blocking of part of the adsorption sites by tannate, to the electrostatic repulsion induced by the net negative charge caused by the deprotonated organic molecules exposed on the surface of the Al–tannate coprecipitate, and to the steric hindrance of tannate, hampering access of the adsorbate to the micropores. These findings are of fundamental significance in understanding the sorption behavior and mobility of As as influenced by biomolecule‐induced structural perturbation of Al hydroxides in the environment." @default.
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• W1967291567 date "2009-09-01" @default.
• W1967291567 modified "2023-09-28" @default.
• W1967291567 title "Impact of Structural Perturbation of Aluminum Hydroxides by Tannate on Arsenate Adsorption" @default.
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• W1967291567 doi "https://doi.org/10.2136/sssaj2007.0295" @default.
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