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Sulfate Adsorption on Goethite
Journal of Colloid and Interface Science, 1999Recent spectroscopic work has suggested that only one surface species of sulfate is dominant on hematite. Sulfate is therefore a very suitable anion to test and develop adsorption models for variable charge minerals. We have studied sulfate adsorption on goethite covering a large range of sulfate concentrations, surface coverages, pH values, and ...
Rietra, R.P.J.J. +2 more
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Adsorption of paraquat on goethite and humic acid-coated goethite
Journal of Hazardous Materials, 2010Adsorption of cationic pesticides in soils is generally attributed to mineral clays and organic matter components. However, iron oxides may also contribute to such adsorption or affect it by associating with other components. Using goethite and humic acid as models for iron oxides and organic matter respectively, we studied the adsorption of the ...
Ana, Iglesias +5 more
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Adsorption of MCPA on goethite and humic acid-coated goethite
Chemosphere, 2010Anionic pesticides are adsorbed on the mineral oxide fraction of the soil surface but considerably less on the organic fraction, so that the presence of organic matter causes a decrease in the amount of pesticide adsorbed, and may affect the mechanism of adsorption.
A, Iglesias +5 more
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Surface structures of gibbsite goethite and phosphated goethite
Nature, 1974INFRARED studies of surface hydroxyls on solids of high area have been limited to almost anhydrous materials prepared at elevated temperatures. These studies have made an important contribution to the understanding of surface catalysis, but have little relevance to adsorption processes that occur on moist surfaces at ambient temperatures.
J. D. RUSSELL +3 more
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Multisite Adsorption of Cadmium on Goethite
Journal of Colloid and Interface Science, 1996Recently a new general ion adsorption model has been developed for ion binding to mineral surfaces (Hiemstra and van Riemsdijk, 1996). The model uses the Pauling concept of charge distribution (CD) and is an extension of the multi-site complexation (MUSIC) approach. In the CD-MUSIC model the charge of an adsorbing ion that forms an inner sphere complex
Venema, P. +2 more
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2020
Iron oxides are ubiquitous in Earth’s crust. Its redox reactions in the environment not only control the cycling and availability of important elements such as C, N, S, but also influence the speciation and mobility of contaminants. During the last few decades, significant advances have been made in understanding the reaction of Fe(II) with Fe(III ...
Luiza Notini de Andrade +6 more
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Iron oxides are ubiquitous in Earth’s crust. Its redox reactions in the environment not only control the cycling and availability of important elements such as C, N, S, but also influence the speciation and mobility of contaminants. During the last few decades, significant advances have been made in understanding the reaction of Fe(II) with Fe(III ...
Luiza Notini de Andrade +6 more
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Interaction of Cadmium with Phosphate on Goethite
Journal of Colloid and Interface Science, 1997Interactions between different ions are of importance in understanding chemical processes in natural systems. In this study simultaneous adsorption of phosphate and cadmium on goethite is studied in detail. The charge distribution (CD)-multisite complexation (MUSIC) model has been successful in describing extended data sets of cadmium adsorption and ...
Venema, P. +2 more
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Nickel retention by goethite and hematite
Minerals Engineering, 2000Abstract The association of nickel with goethite and hematite is of importance for various processes concerned with nickel extraction. The adsorption of Ni 2+ (aq) by goethite and hematite in aqueous solutions were investigated over the pH range of 3 to 9. Similar tendencies were exhibited by both minerals.
Beukes, J.P. +2 more
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Gibbsite and Goethite Solubility
Soil Science Society of America Journal, 20052‐Ketogluconate (kG) is a microbial byproduct that has been isolated from the rhizosphere of several plants and has been found to accumulate around bacteria adhering to rock surfaces. It has long been suspected that kG may play a role in enhancing the bioavailability of soil nutrients.
Michael E. Essington +2 more
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Clays and Clay Minerals, 2005
AbstractHigh-temperature oxide-melt solution calorimetry and acid-solution calorimetry were used to determine the heat of dissolution of synthetic goethite with particle sizes in the range 2–75 nm and measured surface areas of 30–273 m2/g (27–240 × 103 m2/mol).
Lena Mazeina, Alexandra Navrotsky
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AbstractHigh-temperature oxide-melt solution calorimetry and acid-solution calorimetry were used to determine the heat of dissolution of synthetic goethite with particle sizes in the range 2–75 nm and measured surface areas of 30–273 m2/g (27–240 × 103 m2/mol).
Lena Mazeina, Alexandra Navrotsky
openaire +1 more source