Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"Surface Complexation Model"”.
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Geochemical Behavior of the Rare Earth Elements in Natural Terrestrial Waters
… the geochemical behavior of REEs: (1) solution complexation of REEs with both inorganic and organic ligands in natural terrestrial waters; (2) the geochemical behavior of REEs along the groundwater flow paths in two different aquifer types (i.e., sand vs. carbonate); and (3) surface complexation …
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Aqueous Silica in the Environment: Effects on Iron Hydroxide Surface Chemistry and Implications for Natural and Engineered Systems
… waters and exhibits a high affinity for the surfaces of iron oxides. Therefore, it is expected to play an important role in environmental systems. Experiments were conducted to investigate the fundamentals of silica sorption onto pre-formed ferric hydroxide at pH 5.0-9.5 and silica …
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Surface complexation modeling of Pb(II), Cd(II) and Se(IV) onto iron hydroxides in single and bisolute systems
… fate and transport of metal ion contaminants in surface and groundwaters. Surface Complexation Models (SCMs) have emerged as the most promising tools for predicting contaminant ion sorption to iron (hydr)oxides. The reliability of SCMs is highly dependent on the ability to select appropriate …
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The adsorption of Ni, Cu, Zn, Cd and Pb by δ-MnO₂ and its inclusion in an equilibrium model of metal partitioning in soils
Chemical equilibrium modelling provides a mechanistic tool for the prediction of metal partitioning in soils, which is important in predicting the fate and effects of metals in soil systems. In order to set up an equilibrium model of metal partitioning in soil systems, thermodynamic data for all …
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Sequestration of metal and metalloid ions by thermophilic bacteria
… the ligand-cation complexes. The first reported surface complexation models (SCMs) quantifying metal ion adsorption by thermophilic microorganisms predicted cadmium adsorption and desorption by both studied Geobacillus strains over a range of pH values and for different biomasses. The results …
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Basic studies for the incorporation of uranium in sediments
… the process of uranium incorporation. Numerical modeling of the process of U(VI) sorption by sediment was conducted. This study shows that the surface complexation model DLM can predict the major three types of uranium behaviours: (1) the increase of uranium adsorption at pH range between 5 and …
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Effect of adsorption of non-protolyzable anions on goethite (alpha-FeOOH) mobility
… THE PARTICLE MOBILITY AND MAKES THE PARTICLE SURFACE LESS POSITIVE. HOWEVER, FOR SOME NON-PROTOLYZABLE ANIONS LIKE FLUORIDE AND ARSENITE, THE ADSORPTION HAS ALMOST NO EFFECT ON SURFACE CHARGE. THIS BEHAVIOR IS INCONSISTENT WITH THE COMMONLY USED MODELS FOR ANION ADSORPTION. </P><P>THE FOCUS OF …
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Interaction of fluroquinolone antibiotics with nanophase metal oxide photocatalysts and soil minerals
The contamination of surface waters with pharmaceutical compounds has been recognized as a problem in many regions of the world. These xenobiotic compounds originate from point sources, such as treated wastewater effluent, and also from non-point sources, such as runoff from animal rearing …
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Interaction of aqueous U(VI) with goethite, montmorillonite, and UO2(s)
<p>Uranium contamination in subsurface environments is a matter of great concern throughout the world. Fate and transport of uranium in the subsurface can be controlled by U(VI) adsorption and reduction onto common iron (oxy)hydroxides and clay minerals. Aqueous U(VI) can also exchange uranium …
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Understanding and Predicting Water Quality Impacts on Coagulation
… the development of a predictive coagulation model. NOM is capable of interfering with ferric iron hydrolysis and influencing the size, morphology, and identity of precipitates. Conversely, calcium is known to increase the size and aggregation of Fe3+ precipitates and increase surface …