Uranium(VI) sorption onto kaolinite in the presence and absence of humic acid
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A. Křepelová
We studied the U(VI) sorption onto kaolinite in batch experiments in the absence and presence of humic acid (HA) under different experimental conditions: [U]0 = 1 × 10-6 M or 1 × 10-5 M, [HA]0=10 or 50 mg/L, I=0.1 M or 0.01 M NaClO4, pH=3–10, CO2 or N2 atmosphere. The study showed that the U(VI) sorption onto kaolinite is influenced by pH, CO2 and HA presence. In the absence of CO2, the U(VI) uptake increases with increasing pH value up to pH 6. Above pH 6 it remains unchanged. Because of the formation of negatively charged uranyl carbonate complexes, the decrease in the U(VI) sorption onto the negative surface of kaolinite was observed above pH 8 in the presence of CO2. In presence of HA, the adsorption of U(VI) closely follows the adsorption of HA. In the acidic pH range the U(VI) uptake is enhanced compared to the system without HA due to the formation of additional binding sites for U(VI) coming from HA adsorbed onto kaolinite. The formation of aqueous uranyl-humate complexes reduces the U(VI) sorption in the near neutral pH range. The enhancement of the U(VI) concentration from 1 × 10-6 M to 1 × 10-5 M results in the shift of the sorption pH edge by one pH unit to higher pH values. The ionic strength has only a slight influence on the U(VI) sorption onto kaolinite, whereas the HA sorption shows a dependence on the ionic strength.
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Artikel in diesem Heft
- Experimental study of excitation functions of some proton induced reactions on natTi for beam monitoring purposes
- AMS analysis of 36Cl induced in concrete of accelerator facilities
- Ion exchange studies for the removal of plutonium and americium from organic liquid scintillator waste solution
- The interaction of Desulfovibrio äspöensis DSM 10631T with plutonium
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- Surface complexation modelling of uranyl adsorption onto kaolinite based clay minerals using FITEQL 3.2
- Complex formation of U(VI) with the amino acid L-threonine and the corresponding phosphate ester O-phospho-L-threonine
- Thermoanalytical (TG-DTA-DTG) investigations of uranium (VI) and thorium (IV) complexes of o-hydroxy N, N′-dimethylbenzylamine in static air atmosphere
- Studies on protonation and Th(IV) complexation behaviour of dihydroxybenzenes in aqueous 1 M NaClO4 medium
- Development of [103Pd]-labeled-bis(N4-methylthiosemicarbazone) complexes as possible therapeutic agents
- Potential of Broussonetia papyrifera leaves as biomonitors for atmospheric pollution: use of INAA and AAS techniques
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