Competitive sorption of Cu(II), Eu(III) and U(VI) ions on TiO2 in aqueous solutions—A potentiometric study

Konstantinou, Maria; Pashalidis, Ioannis

doi:10.1016/j.colsurfa.2008.04.020

Cited by 38 publications

(14 citation statements)

References 21 publications

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“…The lower uranyl selectivity of TC versus F-TC presumably reflects that terminating hydroxyl groups of TC exhibit poor metal ion discrimination. 51 The present results demonstrate that amidoxime modification of a MXene surface greatly enhances selective adsorption of uranyl ions. The corresponding distribution coefficient (K d ) for U(VI) was calculated as >10 4 from Eu/U competitive adsorption experiments, such that F-TC should effectively extract U(VI) from wastewater containing competing ions.…”

Section: ■ Results and Discussionsupporting

confidence: 52%

Aryl Diazonium-Assisted Amidoximation of MXene for Boosting Water Stability and Uranyl Sequestration via Electrochemical Sorption

Zhang

Wang

Huang

et al. 2020

ACS Appl. Mater. Interfaces

138

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Despite that two-dimensional transition metal carbides and carbonitrides (MXenes) are burgeoning candidates for remediation of environmental pollutants, the construction of robust functionalized MXene nanosheets with a high affinity for target heavy metal ions and radionuclides remains a challenge. Here we report the successful placement of amidoxime chelating groups on Ti 3 C 2 T x MXene surface by diazonium salt grafting. The introduction of amidoxime functional groups significantly enhances the selectivity of Ti 3 C 2 T x nanosheets for uranyl ions and also greatly improves their stability in aqueous solution, enabling efficient, rapid, and recyclable uranium extraction from aqueous solutions containing competitive metal ions. Benefiting from the excellent conductivity of MXenes, the amidoxime functionalized Ti 3 C 2 T x nanosheets show outstanding electrochemical performance such that when loaded on carbon cloth the application of an electric field increases the uranium adsorption capacity from 294 to 626 mg/g, outperforming all organic electrochemical sorption materials reported previously. The present work provides an effective strategy to functionalize MXene nanosheets with fundamental implications for the design of MXene-based selective electrosorption electrode materials. Figure 2. XPS spectra of Ti 3 C 2 T x nanoflakes before and after grafting. High-resolution O 1s region of (a) TC and (b) G-TC and N 1s region of (c) G-TC and (d) F-TC.

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Section: ■ Results and Discussionsupporting

confidence: 52%

Aryl Diazonium-Assisted Amidoximation of MXene for Boosting Water Stability and Uranyl Sequestration via Electrochemical Sorption

Zhang

Wang

Huang

et al. 2020

ACS Appl. Mater. Interfaces

138

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“…The results from Payne et al [10] are of particular interest for PA in that they show the presence of TiO 2 in kaolinite, even at trace levels, appears to play an important role in retaining U at low uranyl concentrations. No study has yet been conducted with trivalent actinides but few reports of trivalent lanthanides sorption onto TiO 2 [20][21][22][23][24][25] exist, which are considered as homologs for the trivalent actinides [26].…”

Section: Introductionmentioning

confidence: 98%

Sorption of Eu(III) onto titanium dioxide: Measurements and modeling

Bouby

Lützenkirchen

Dardenne

et al. 2010

Journal of Colloid and Interface Science

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“…Removal of uranium from large volumes of wastewaters is associated with cost effective conventional remediation technologies (e.g. mineral adsorption [3]). Sorption technologies based on biomass by-products are alternative methods for removing toxic metals from wastewater [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Uranium sorption from aqueous solutions by activated biochar fibres investigated by FTIR spectroscopy and batch experiments

Hadjittofi

Pashalidis

2014

J Radioanal Nucl Chem

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The efficiency of activated biochar fibres obtained from Opuntia ficus indica regarding the sorption of hexavalent uranium (U(VI)) from aqueous solutions has been investigated by batch experiments, as a function of various physicochemical parameters, and FTIR spectroscopy prior and after U(VI) sorption. The experimental results show that the activated biochar fibres possess extraordinary sorption capacity for U(VI) even in acidic solutions (q max = 210 g kg -1 ), which is attributed to the formation of inner-sphere complexes with the surface carboxylic moieties, available in high density on the lamellar structures of the bio-sorbent. The adsorption process is described by a two-step exothermic reaction.

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Competitive sorption of Cu(II), Eu(III) and U(VI) ions on TiO2 in aqueous solutions—A potentiometric study

Cited by 38 publications

References 21 publications

Aryl Diazonium-Assisted Amidoximation of MXene for Boosting Water Stability and Uranyl Sequestration via Electrochemical Sorption

Aryl Diazonium-Assisted Amidoximation of MXene for Boosting Water Stability and Uranyl Sequestration via Electrochemical Sorption

Sorption of Eu(III) onto titanium dioxide: Measurements and modeling

Uranium sorption from aqueous solutions by activated biochar fibres investigated by FTIR spectroscopy and batch experiments

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