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• W2078006043 abstract "Adsorption of dissolved vanadium V(V) onto synthetic amorphous ferric oxyhydroxide ((am)Fe2O1,-H2O) was measured using synthetic seawater medium (35 cee). Experiments were conducted at 253C as a function of reaction time, pH, concentration of adsorbent, and concentration of adsorbate. The purposes of the study were to determine the effectiveness of (am) Fe2O3, -H2O in removing dissolved V(V) from seawater, and to estimate the role of (am)Fe2O3,-H2O in sediments in removing vanadium leached from stabilized oil ash blocks placed on the sea floor. Adsorption of V(V) onto (am)Fe2O3-H2O in seawater was rapid and reached a quasi-equilibrium condition within 1 h under laboratory conditions. pH was the major factor influencing adsorption of V(V) by (am) Fe2O3,-H2O. Maximum adsorption occurred at pH 4.6 in the solutions containing total particulate iron (FeT) concentrations of 0.6 × 10−3 and 1.3 × 10−3M. Adsorption of anionic V(V) onto (am)Fe2O2-H2O decreased when pH increased. Significant dissolution of (am)Fe2O3-H2O occurred at pH values < 3.5 and this enhanced the observed decrease in adsorption for low concentrations of FeT. The increased presence of neutral and cationic V(V) :species at pH 3.5 may also be a major factor in reducing the amount of V (V) available for adsorption by (am)Fe2O3-H2O. The effect of pH was, however, overridden by the effect of a relatively high FeT concentration; complete removal of dissolved V (V) was found in both alkaline and acidic solutions when the FeT concentration was 5.6 × 10−3M. Adsorption isotherms of V (V) conformed to a Langmuir shape, suggesting that V (V) adsorption by (am) Fe2O2-H2O is a site-specific reaction. The results of this study indicate that the surface sites of (am)Fe2O3-H2O are heterogeneous. A preliminary model was developed to predict the geochemical fate of anthropogenic V (V) in seawater in the presence of (am) Fe2O2-H2O; the model is applicable for solutions containing FeT in the concentration range 3 × 10-3 to 5.6 × 10−1M and dissolved V (V) in the range 1 × 10-4 to 2 × 10−3M." @default.
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• W2078006043 date "1988-10-01" @default.
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• W2078006043 title "Role of amorphous ferric oxyhydroxide in removal of anthropogenic vanadium from seawater" @default.
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• W2078006043 doi "https://doi.org/10.1016/0304-4203(88)90060-6" @default.
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