Insights into sorption species of Eu(III) on γ-Al2O3 and bentonite under different pH: Studies at macro- and micro-scales

Fan, Qiaohui; Li, Ping; Zheng, Zhong; Wu, Wangsuo; Liu, Chunli

doi:10.1007/s10967-013-2819-x

Cited by 12 publications

(6 citation statements)

References 35 publications

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“…[1][2][3][4][5][6] The macroscopic properties of phosphors, such as the emission spectrum or the luminous efficiency, rely on their composition, crystal structure, and morphology. [7][8][9][10][11][12] Extensive work has been devoted to the development of effective morphology-controlled methods to synthesize functional materials with complex three-dimensional (3D) hierarchical architectures, such as Fe 2 O 3 flower-like microspheres, 13 urchin-like WO 3 and MnWO 4 microstructures, 14,15 cactus-like b-Ga 2 O 3 microarchitectures, 16 dandelion-like ZnO and CuO architectures, 17,18 3D hierarchical MWO 4 (M 5 Mn, Bi, Ba, and Pb), and MMoO 4 (M 5 Fe, Pb, and Ba) superstructures, 9,[19][20][21][22][23] which have been fabricated from low dimensional nanobuilding units by bottom-up approaches. Since sphere morphology of phosphor is favorable for high brightness and high resolution, spherical structured particles have been interestingly studied in these years.…”

Section: Introductionmentioning

confidence: 99%

“…Since sphere morphology of phosphor is favorable for high brightness and high resolution, spherical structured particles have been interestingly studied in these years. [16][17][18] The selection of host materials for RE ions is crucial to obtain large luminescence signals. 14 Materials with low phonon energies present small nonradiative losses owing to the multiphonon relaxation, and consequently, the luminescence efficiency is enhanced.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and photoluminescence properties of Eu³⁺-doped ZrO₂ hollow spheres

et al. 2015

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ZrO 2 :Eu 31 hollow spheres were successfully fabricated with the resin microspheres as the template. The sample characterizations were carried out by means of x-ray diffraction (XRD), scanning electron microscope (SEM), and photoluminescence spectra. XRD results revealed that Eu 31 -doped samples were pure t-ZrO 2 phase after being calcined at 873 K. SEM results exhibited that this Eu 31 doped ZrO 2 was hollow spheres; the diameter and thickness of which were about 450 and 50 nm, respectively. Upon excitation at 394 nm, the orange-red emission bands at the wave length longer than 570 nm were from 5 D 0 ! 7 F J (J 5 1, 2) transitions. The asymmetry ratio of ( 5 D 0 ! 7 F 2 )/( 5 D 0 ! 7 F 1 ) intensity is about 1.61, 1.26, 1.42, 1.42, 1.40, and 1.38 for the Eu 31 concentration 0.4, 0.7, 1.0, 1.5, 2.0, and 2.5 mol%, respectively. These values suggest that the asymmetry ratio of Eu 31 ions is independent of the doping concentration. The optimal doping concentration of Eu 31 ions in ZrO 2 is 1.5 mol%. According to Dexter's theory, the critical distance between Eu 31 ions for energy transfer was determined to be 16 Å.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and photoluminescence properties of Eu³⁺-doped ZrO₂ hollow spheres

et al. 2015

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“…1,[8][9][10][11][12] Therefore, the behaviors of Eu(III) on oxide mineral, clay, granite, and soil were widely adapted to extrapolate the transport behaviors of Am(III) and other actinides. 1,[8][9][10][11][12] Therefore, the behaviors of Eu(III) on oxide mineral, clay, granite, and soil were widely adapted to extrapolate the transport behaviors of Am(III) and other actinides.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, Eu(III) has been oen taken as a homologue for trivalent actinide ions like Am(III) and Cm(III) because the ionic radius of Eu 3+ is almost the same for all trivalent actinide ions, which results in similar physical and chemical characteristics. 1,[8][9][10][11][12] Therefore, the behaviors of Eu(III) on oxide mineral, clay, granite, and soil were widely adapted to extrapolate the transport behaviors of Am(III) and other actinides. [13][14][15][16][17][18] For example, the adsorption of Eu(III) on attapulgite was strongly dependent on pH and ionic strength, and independent of temperature.…”

Section: Introductionmentioning

confidence: 99%

Comparative adsorption of Eu(iii) and Am(iii) on TPD

Fan

Zhao

et al. 2015

Environ. Sci.: Processes Impacts

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Comparative adsorption behaviors of Eu(III) and Am(III) on thorium phosphate diphosphate (TPD), i.e., Th4(PO4)4P2O7, have been studied using a batch approach and surface complexation model (SCM) in this study. The results showed that Eu(III) and Am(III) adsorption increased to a large extent with the increase in TPD dose. Strong pH-dependence was observed in both Eu(III) and Am(III) adsorption processes, suggesting that inner-sphere complexes (ISCs) were possibly responsible for the adsorption of Eu(III) and Am(III). Meanwhile, the adsorption of Eu(III) and Am(III) decreased to a different extent with the increase in ion strength, which was possibly related to outer-sphere complexes and/or ion exchange. In the presence of fulvic acid (FA), the adsorption of Eu(III) and Am(III) showed high enhancement mainly due to the ternary surface complexes of TPD-FA-Eu(3+) and TPD-FA-Am(3+). The SCM showed that one ion exchange (≡S3Am/Eu) and two ISCs (≡(XO)2Am/EuNO3 and ≡(YO)2Am/EuNO3) seemed more reasonable to quantitatively describe the adsorption edges of both Eu(III) and Am(III). Our findings obviously showed that Eu(III) could be a good analogue to study actinide behaviors in practical terms. However, it should be kept in mind that there are still obvious differences between the characteristics of Eu(III) and Am(III) in some special cases, for instance, the complex ability with organic matter and adsorption affinity to a solid surface.

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“…Sorption of radionuclides on bentonite is an important process and 59 has been widely investigated in resent years as it can retard their migra-60 tion in the environment [12][13][14]. In China, bentonite from Gaomiaozi 61 county (Inner Mongolia, China) has been considered as the most prom-62 ising candidate for the buffer material in high level radioactive waste 63 repository.…”

mentioning

confidence: 99%

Insights into sorption species of Eu(III) on γ-Al2O3 and bentonite under different pH: Studies at macro- and micro-scales

Cited by 12 publications

References 35 publications

Synthesis and photoluminescence properties of Eu³⁺-doped ZrO₂ hollow spheres

Synthesis and photoluminescence properties of Eu³⁺-doped ZrO₂ hollow spheres

Comparative adsorption of Eu(iii) and Am(iii) on TPD

Effects of pH, ionic strength and humic acid on the sorption of neptunium(V) to Na-bentonite

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Insights into sorption species of Eu(III) on γ-Al2O3 and bentonite under different pH: Studies at macro- and micro-scales

Cited by 12 publications

References 35 publications

Synthesis and photoluminescence properties of Eu3+-doped ZrO2 hollow spheres

Synthesis and photoluminescence properties of Eu3+-doped ZrO2 hollow spheres

Comparative adsorption of Eu(iii) and Am(iii) on TPD

Effects of pH, ionic strength and humic acid on the sorption of neptunium(V) to Na-bentonite

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Synthesis and photoluminescence properties of Eu³⁺-doped ZrO₂ hollow spheres

Synthesis and photoluminescence properties of Eu³⁺-doped ZrO₂ hollow spheres