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Sorption
Items for "Sorption"
Experimental evidence for solubility limitation of the aqueous Ni(II) concentration and isotopic exchange of 63Ni in cementitious systems
Ni radioisotopes are present in cementitious repositories for radioactive waste and considered to be safety relevant in performance assessment...
Keywords: Nickel, Cement, Sorption, Background stable isotope, Isotopic exchange
01/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagEffect of pH and fulvic acid on sorption and complexation of cobalt onto bare and FA bound MX-80 bentonite
Bentonite has attracted great interest in nuclear waste management because of its outstanding properties...
Keywords: Sorption, Complexation, Bentonite, Cobalt, pH
02/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSunflower stem: a novel and economical scavenger for Hg(II) ions from aqueous solutions and its kinetic and thermodynamic investigation
The sorption of >93% of Hg(II) ions is achieved onto sunflower stem (50 mg/4.5 cm3) from deionized water (D.W.) in 10 minutes equilibration time between two phases...
Keywords: Sunflower (Helianthus annus) stem, Sorption, Hg(II) ions, Sorption isotherms, Kinetics
03/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSorption of radionuclides from complexone solutions in liquid CO2
Sorption of 241Am and 137Cs on ion-exchange resins with different functional groups from complexone solutions in liquid CO2 was investigated...
Keywords: Americium, Cesium, Liquid carbon dioxide, Sorbent, Sorption
02/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagEffects of phosphate and ionic strength upon uranium(VI) sorption onto alumina as a function of pH
The sorption edges and the sorption isotherms of UO22+ onto alumina were determined by a batch technique in the presence and absence of phosphate at pH range 3–6, ionic strength range 0.05–0.5 mol/L and UO22+ concentrations 10-5–10-4 mol/L...
Keywords: Uranium, Sorption, Alumina, Phosphate, Ionic strength
04/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSorption of Cm(III) onto different Feldspar surfaces: a TRLFS study
The pH dependent sorption of Cm(III) onto alkali Feldspars (albite and orthoclase) is investigated by time resolved laser fluorescence spectroscopy (TRLFS) in the pH range from 3.4 to 9.4...
Keywords: Curium, Feldspars, Alteration, Surface complexation, Sorption
05/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSorption of Cs, Ni, Pb, Eu(III), Am(III), Cm, Ac(III), Tc(IV), Th, Zr, and U(IV) on MX 80 bentonite: An experimental approach to assess model uncertainty
A multi-site surface complexation/ion exchange model for dispersed MX 80 bentonite has been calibrated, considering the dissolution properties of the constituting mineral assemblage, for sorption of a large number of radionuclides, using experimental data from the present study together with well constrained literature data...
Keywords: Bentonite, Sorption, Actinides, Fission products, modeling
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagCm(III) sorption onto γ-Al2O3: New insight into sorption mechanisms by time-resolved laser fluorescence spectroscopy and extended X-ray absorption fine structure
Sorption of trivalent Cm onto γ-Al2O3 is investigated by time-resolved laser fluorescence spectroscopy (TRLFS)...
Keywords: Cm, Gd, Lu, gamma-Al2O3, Sorption
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagEffect of humic acid on cesium sorption on silica colloids
Effect of humic acid (HA) on the sorption behaviour of 137Cs on silica colloids has been studied by batch procedure over a pH range of 3-10 and at ionic strength of 0.05 M (NaClO4)...
Keywords: 137Cs, Silica colloids, Humic acid, Zeta-potential, Sorption
06/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSorption characteristics of 99Tc onto bentonite material with different additives under anaerobic conditions
The radionuclide 99Tc is one of the fission products of spent nuclear fuel. The chemical forms of this element depend primarily on the pH and Eh of the environment...
Keywords: Sorption, Technetium, Bentonite, Glove box conditions, Deep repository
08/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagInfluence of soil humic acid and fulvic acid on sorption of thorium(IV) on MX-80 bentonite
Th(IV) is considered herein as a chemical analogue of other actinides (IV). Effect of pH, ionic strength and humic acid/fulvic acid concentrations on the sorption of thorium(IV) to MX-80 bentonite was studied by batch technique...
Keywords: Sorption, Bentonite, Thorium, Humic acid, Fulvic acid
08/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagOn the stability of Pu(III) at different pH under non-inert conditions
A glove-box in contact with the lab atmosphere has been used in a test to see whether trivalent plutonium can be kept in this oxidation state at different pH...
Keywords: Plutonium, Trivalent, Oxidation state, Extraction, Sorption
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagTheoretical first step towards an understanding of the uranyl ion sorption on the rutile TiO2(110) face: A DFT periodic and cluster study
First results of a periodic and cluster Density Functional Theory (DFT) study of the uranyl ion (UO22+) sorption onto the rutile TiO2(110) face, based on plane wave and localised basis sets, are presented...
Keywords: Sorption, Uranyl, DFT, Rutile(110), Periodic
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagNp(V)O2+ sorption on hydroxyapatite-effect of calcium and phosphate anions
The sorption of NpO2+ from aqueous solution on hydroxyapatite was studied as a function of the amount of sorbent, initial NpO2+ concentration, ionic strength and pcH...
Keywords: NpO2+, Sorption, Hydroxyapatite, Kinetics, Thermodynamics
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagTechnetium sorption by stibnite from natural water
The sorption of technetium by powdered and polished mineral stibnite Sb2S3 has been investigated in simulated and natural underground waters from the Meuse/Haute–Marne region (France)...
Keywords: Technetium, Stibnite, Natural water, Sorption
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagMechanisms of cesium sorption onto magnetite
One of the current options for the final disposal of high level radioactive wastes is the deep geological repository (DGR)...
Keywords: Cesium, Sorption, Surface complexation modelling, Magnetite
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSorption of cesium on granite under aerobic and anaerobic conditions
This study focused on the determination of distribution coefficients (Kd) of 137Cs under aerobic (∼21% O2) and anaerobic conditions (1−10 ppm O2) which might be found in the deep geologic environment...
Keywords: Sorption, Cesium, Aerobic, Anaerobic, Batch tests
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagUranium(VI) sorption onto kaolinite in the presence and absence of humic acid
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...
Keywords: Uranium(VI), Sorption, Kaolinite, Humic acid
12/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSorption of europium(III) on polymeric silica in perchlorate media
Sorption of europium, Eu(III) with polymeric silicic acid has been studied under varying experimental conditions such as pH, ionic strength (I), concentration of silicic acid and of Eu(III), the presence of carbonate ions, and aging time...
Keywords: Europium, Sorption, Silica, Polymerization, Coagulation
01/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSorption behavior of curium(III) on hydrous silica: a kinetic and thermodynamic study
Sorption of tracer curium, Cm3+, on SiO2· H2O (silica gel) was investigated under different experimental conditions such as time of equilibration, concentration of Sm3+, pcH, and temperature...
Keywords: Curium, Sorption, Silica, Kinetics, Thermodynamics
03/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagEffect of complexing anions on europium sorption on suspended silica: a TRLFS study for ternary complex formation
The sorption of europium, Eu(III), on suspended silica was studied in perchlorate media under varying concentrations of Eu(III) and silica, at pH 4 to 8, and ionic strength from 0.20 to 1.40 M NaClO4 at 298 K...
Keywords: Europium, Sorption, Silica, Complexing anions, Ternary complex
05/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSorption of uranyl(VI) cations on suspended silicate: effects of N-donor ligands, carboxylic acids, organic cosolvents, and metal ions
Sorption of uranyl ion, UO22+, on silicate particles (3.00 g/L) was studied in sodium perchlorate solution as a function of pcH and ionic strength at 298 K...
Keywords: Uranium, Sorption, Silicate, Ternary complex, Carboxylic acids
05/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagExperimental device for the accurate determination of wood-water relations on micro-samples
This paper describes an experimental device designed for the accurate determination of wood/water relations on micro-samples...
Keywords: collapse, microsample, shrinkage, Sorption, Water
06/2007 | Holzforschung, Walter de GruyterWood-water sorption isotherm prediction with artificial neural networks: A preliminary study
This is a preliminary study that proposes an original prototype artificial neural network to be used in addition to the two classic sorption isotherm modeling methods, Hailwood-Horrobin (HH) and Guggenheim-Anderson-deBoer (GAB), in predicting the equilibrium moisture content in wood at three different temperatures (30, 45 and 60°C) for softwood (lodgepole pine) sapwood and heartwood specimens...
Keywords: Artificial Neural Networks, chemical composition, Guggenheim-Anderson-deBoer (GAB) model, Hailwood-Horrobin (HH) model, Sorption, Water, wood
05/2005 | Holzforschung, Walter de GruyterA hysteresis model suitable for numerical simulation of moisture content in wood
The equilibrium moisture content in wood depends not only on the current relative humidity in ambient air, but also on the history of relative humidity variations...
Keywords: Hysteresis, independent domain model, moisture content, numerical method, Sorption
03/2007 | Holzforschung, Walter de GruyterModeling batch kinetics of cesium, cobalt and strontium ions adsorption from aqueous solutions using hydrous titanium oxide
Hydrous titanium oxide was chemically synthesized and tested as adsorbent material for the removal of cesium, cobalt and strontium ions from chloride waste solutions using batch technique...
Keywords: modeling, Sorption, kinetic, Chloride solutions, Hydrous titanium oxide
07/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagEffect of humic acid on sorption of neptunium on hematite colloids
Sorption of neptunium on hematite colloids has been studied at varying pH values (3–10) in absence and presence of humic acid using 239Np as a tracer...
Keywords: Neptunium, Humic acid, Hematite, Sorption, Speciation
09/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagKinetics and thermodynamics of uranium(VI) sorption on hydrous silica
Sorption of uranyl ion, UO22+, on SiO2· x H2O (silica gel) has been investigated as a function of time, amount of silica gel (0.10–0.60 g), uranium concentration (5.00×10-5–1.00×-3 M), ionic strength (0.20–1.40 M NaClO4), pH (∼2.0–6.0), and temperature (283–333 K)...
Keywords: Kinetics, Thermodynamics, Uranium, Sorption, Silica
09/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSorption of tetravalent plutonium and humic substances onto kaolinite
The sorption of tetravalent plutonium onto kaolinite, a clay mineral, has been studied as a function of pH...
Keywords: Plutonium, Oxidation state, Kaolinite, Sorption, desorption
10/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagTemperature effects on the interaction mechanisms between U(VI) and Eu(III) and ZrP2O7: experiment and modelling
In the field of nuclear waste management, prediction of the radionuclides migration through the geosphere has to take into account the effects of temperature...
Keywords: Sorption, Uranium, Europium, Zirconium diphosphate, temperature
01/2008 | Radiochimica Acta, Oldenbourg WissenschaftsverlagEffect of humic acid, fulvic acid, pH and temperature on the sorption-desorption of Th(IV) on attapulgite
Sorption of Th(IV) on attapulgite as a function of pH and temperature in the presence and absence of humic acid and fulvic acid was studied under ambient conditions using batch technique...
Keywords: Th(IV), Attapulgite, Sorption, pH, HA/FA
03/2008 | Radiochimica Acta, Oldenbourg Wissenschaftsverlag