Article Abstract:
A model where the suppression of ion exchange due to lateral interactions between the interphase species is assumed by the Frumkin isotherm is applied to the ion-exchange reactions on metal oxides with simple monovalent ions. Here, the action of ions is weak and the essential properties of oxide surfaces are well defined. The intensity of cation exchange increases in the order of Al2O3 less than Fe3O4 less than TiO2 less than MnO2, while the intensity of anion exchange decreases in the same order. The electronegativity of the lattice metal ions of these oxides was also found to increase in the same order.
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Article Abstract:
The effects of sediment drying prior to leaching and the possibility of dissolved elements readsorption during the leaching experiment are discussed. Hydroxylamine hydrochloride-acetic acid and hydrochloride were used to leach rare earth elements (REE) from a pelagic sediment while Neutron activation analysis was used to measure the REE of the insoluble residues. Results preclude that the insoluble phases during the leaching procedure enabled significant readsorption of the REE.
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Article Abstract:
A semianalytical solution for a carbon adsorption process with a nonlinear boundary condition was presented. The solution utilizes a unit-step function to represent adsorbed-phase adsorbate concentration at the solid-liquid interface. Three nonlinear simultaneous algebraic expressions were used to calculate the bulk liquid concentration. Results from the solution were in good agreement with exprimental data.
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