Adsorption of Strontium onto Synthetic Iron(III) Oxide up to High Ionic Strength Systems
نویسندگان
چکیده
In this work, the adsorption behavior of Sr onto a synthetic iron(III) oxide (hematite with traces goethite) has been studied. This solid, which might be considered representative Fe3+ solid phases (iron corrosion products), was characterized by X-Ray Diffraction (XRD) and Photoelectron Spectroscopy (XPS), its specific surface area determined. Both XRD XPS data are consistent mixed containing more than 90% hematite 10% goethite. The further fast acid-base titrations at different NaCl concentrations (from 0.1 to 5 M). Subsequently, for each background concentration used titrations, Sr-uptake experiments were carried out involving two levels (1 × 10−5 M, respectively) constant (7.3 g/L) as function −log([H+]/M). A Surface Complexation Model (SCM) fitted experimental data, following coupled Pitzer/surface complexation approach. Pitzer model applied aqueous species. Basic Stern interfacial electrostatics system, includes ion-specific effects via pair-formation constants, whereas Pitzer-approach involves ion-interaction parameters that enter through activity coefficients simple 1-pK (generic species, denoted >XOH−1/2). Parameter fitting using general parameter estimation software UCODE, modified version FITEQL2. combined approach describes full set reasonably well Sr-surface complexes, one them including chloride. Monodentate bidentate models tested found perform equally well. SCM is particularly able account incomplete uptake higher salt levels, supporting idea conventionally in below 1 M applicable high if correct corrections species applied. generates self-consistent framework practical semi-mechanistic SCMs. coupling conventional electrostatic double layer bulk solution earlier strongly adsorbing solutes here shown successful weakly solutes.
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ژورنال
عنوان ژورنال: Minerals
سال: 2021
ISSN: ['2075-163X']
DOI: https://doi.org/10.3390/min11101093