Sorption and desorption of uranium(VI) on GMZ bentonite: effect of pH, ionic strength, foreign ions and humic substances

Li, Shicheng; Wang, Xiaoli; Huang, Zhaoya; Du, Linfang; Tan, Zhijian; Fu, Yubin; Wang, Xiaolin

doi:10.1007/s10967-015-4513-7

Cited by 41 publications

(10 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3, a) indicates the rather complex nature of the adsorption processes on the surface of the samples. It is known [21] that adsorption of uranium by natural montmorillonite significantly depends on the pH of the solution. The curve has a clearly pronounced maximum at pH 4-6.…”

Section: Results Of Studies Of Texture and Adsorption Characteristicsmentioning

confidence: 99%

Investigation of the structure and sorption peculiarities of cobalt and uranium ions by nanocomposites based on montmorillonite and tetraethoxysilane

Doroshenko

Pylypenko

Kovalchuk³

et al. 2018

EEJET

View full text Add to dashboard Cite

6 organisms. One of the most dangerous heavy metals and radionuclides are uranium and cobalt compounds. Uranium compounds are widely used in the nuclear fuel cycle. They get into the environment mainly with the wastewater of hydrometallurgical plants processing uranium ores and also are components of liquid radioactive waste of nuclear power plants [1]. Pollution by cobalt compounds is possible due 6

show abstract

Section: Results Of Studies Of Texture and Adsorption Characteristicsmentioning

confidence: 99%

Investigation of the structure and sorption peculiarities of cobalt and uranium ions by nanocomposites based on montmorillonite and tetraethoxysilane

Doroshenko

Pylypenko

Kovalchuk³

et al. 2018

EEJET

View full text Add to dashboard Cite

show abstract

“…The prominent species are UO 2 CO 3 , UO 2 (CO 3 ) 2 2− and UO 2 (CO 3 ) 3 4− at pH > 7 [24,35]. The adsorption of UO 2 2+ on amino-functionalized clay at pH < 4.0 is lower, which could be explained by the amino group being protonated to form -NH 3 + at lower pH, so there are only fewer -NH 2 sites available on the sorbents' surface for UO 2 2+ adsorption.…”

Section: Effect Of Ph and Other Ionsmentioning

confidence: 99%

Adsorption of uranium(VI) from groundwater by amino-functionalized clay

Cheng

Leng

et al. 2021

J Radioanal Nucl Chem

View full text Add to dashboard Cite

A kind of amino-functionalized clay was prepared by grafting APTES from clay in the Alxa area (Inner Mongolia, China), and its application for the U(VI) removal from Alxa groundwater was studied in this work. The results indicate that the sorption strongly depended on the pH and ions. The presence of amino functional groups significantly enhances the adsorption of uranium on clay in groundwater. The sorption isotherms fitted well with the Langmuir model, whereas the sorption kinetics could be fitted by a pseudo-second-order model. These findings indicate that amino-functionalized clay can effectively adsorb U(VI) in complex groundwater samples.

show abstract

“…One important parameter for the sorption of uranium on clay minerals is the pH [16], which also provides the geochemical explanation for the changes in K d within the gradients. The pH controls speciation of uranium as well as the charge of the functional groups on the clay mineral surfaces [48,49]. With rising pH above 7, sorption of uranium on clay minerals decreases due to changes in the sorption processes from cation exchange to surface complexation [33,34,48,50].…”

Section: Geochemical System Governs Uranium Migrationmentioning

confidence: 99%

“…The pH controls speciation of uranium as well as the charge of the functional groups on the clay mineral surfaces [48,49]. With rising pH above 7, sorption of uranium on clay minerals decreases due to changes in the sorption processes from cation exchange to surface complexation [33,34,48,50]. Further, the negative surface charge of the clay minerals also increases and thus negatively charged species are more repelled.…”

Section: Geochemical System Governs Uranium Migrationmentioning

confidence: 99%

“…The K d profiles were opposed to the pH, accordingly (Figure 7c). Moreover, as pH is above 7, sorption of uranium increases with ionic strength due to changes in the electrochemical interaction [48,50]. The ionic strength governs the thickness of the DDL, that compensates the negative surface charge of the clay minerals by the attraction of cations.…”

Section: Geochemical System Governs Uranium Migrationmentioning

confidence: 99%

See 1 more Smart Citation

Potential Uranium Migration within the Geochemical Gradient of the Opalinus Clay System at the Mont Terri

Hennig

Kühn

2021

Minerals

View full text Add to dashboard Cite

Transport properties of potential host rocks for nuclear waste disposal are typically determined in laboratory or in-situ experiments under geochemically controlled and constant conditions. Such a homogeneous assumption is no longer applicable on the host rock scale as can be seen from the pore water profiles of the potential host rock Opalinus Clay at Mont Terri (Switzerland). The embedding aquifers are the hydro-geological boundaries, that established gradients in the 210 m thick low permeable section through diffusive exchange over millions of years. Present-day pore water profiles were confirmed by a data-driven as well as by a conceptual scenario. Based on the modelled profiles, the influence of the geochemical gradient on uranium migration was quantified by comparing the distances after one million years with results of common homogeneous models. Considering the heterogeneous system, uranium migrated up to 24 m farther through the formation depending on the source term position within the gradient and on the partial pressure of carbon dioxide pCO2 of the system. Migration lengths were almost equal for single- and multicomponent diffusion. Differences can predominantly be attributed to changes in the sorption capacity, whereby pCO2 governs how strong uranium migration is affected by the geochemical gradient. Thus, the governing parameters for uranium migration in the Opalinus Clay can be ordered in descending priority: pCO2, geochemical gradients, mineralogical heterogeneity.

show abstract

Sorption and desorption of uranium(VI) on GMZ bentonite: effect of pH, ionic strength, foreign ions and humic substances

Cited by 41 publications

References 46 publications

Investigation of the structure and sorption peculiarities of cobalt and uranium ions by nanocomposites based on montmorillonite and tetraethoxysilane

Investigation of the structure and sorption peculiarities of cobalt and uranium ions by nanocomposites based on montmorillonite and tetraethoxysilane

Adsorption of uranium(VI) from groundwater by amino-functionalized clay

Potential Uranium Migration within the Geochemical Gradient of the Opalinus Clay System at the Mont Terri

Contact Info

Product

Resources

About