133Cs NMR and XPS investigation of cesium adsorbed on clay minerals and related phases

Kim, Yeongkyoo; Cygan, Randall T.; Kirkpatrick, R. James

doi:10.1016/0016-7037(95)00452-1

Cited by 121 publications

(79 citation statements)

References 46 publications

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“…So far, a variety of studies have been devoted to characterizing various aspects of the sorption behavior of Cs + ion on kaolinite and on clinoptilolite, using a variety of characterization techniques [9][10][11][12][13][14][15][16][17][18]. In our earlier studies, the retention capacity of kaolinite toward Cs + was studied and compared with that of other clay minerals [9].…”

Section: Introductionmentioning

confidence: 99%

“…The applicability of kaolinite as a reactive barrier for Cs + retention was tested by other authors and the irreversibility of its uptake by kaolinite was discussed and compared with other clay minerals [11,12]. The sorption sites and atomic dynamics of Cs + on kaolinite were investigated and compared with its uptake by illite and montmorillonite [13,14]. The effectiveness of clinoptilolite as countermeasure amendments against Cs + migration from soil into plants was reported [15].…”

Section: Introductionmentioning

confidence: 99%

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Physicochemical characterization of the retardation of aqueous Cs+ ions by natural kaolinite and clinoptilolite minerals

Shahwan

Akar

Eroğlu

2005

Journal of Colloid and Interface Science

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The aim of this study was to carry out kinetic, thermodynamic, and surface characterization of the sorption of Cs + ions on natural minerals of kaolinite and clinoptilolite. The results showed that sorption followed pseudo-second-order kinetics. The activation energies were 9.5 and 13.9 kJ/mol for Cs + sorption on kaolinite and clinoptilolite, respectively. Experiments performed at four different initial concentrations of the ion revealed that the percentage sorption of Cs + on clinoptilolite ranged from 90 to 95, compared to 28 to 40 for the kaolinite case. At the end of a 1 week period, the percentage of Cs + desorption from clinoptilolite did not exceed 7%, while it amounted to more than 30% in kaolinite, indicating more stable fixation by clinoptilolite. The sorption data were best described using Freundlich and D-R isotherm models. Sorption showed spontaneous and exothermic behavior on both minerals, with H 0 being −6.3 and −11.4 kJ/mol for Cs + uptake by kaolinite and clinoptilolite, respectively. Expanding the kaolinite interlayer space from 0.71 to 1.12 nm using DMSO intercalation, did not yield a significant enhancement in the sorption capacity of kaolinite, indicating that the surface and edge sites of the clay are more energetically favored. EDS mapping and elemental analysis of the surface of kaolinite and clinoptilolite revealed more intense signals on the surface of the latter with an even distribution of sorbed Cs + onto the surfaces of both minerals.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physicochemical characterization of the retardation of aqueous Cs+ ions by natural kaolinite and clinoptilolite minerals

Shahwan

Akar

Eroğlu

2005

Journal of Colloid and Interface Science

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“…The typical photon energy used in the XPS measurements was 3000 eV. The photon flux was ∼10 10 photons·cm −2 ·s −1 . The energy resolution of the monochromator was 1.4 eV at 3000 eV.…”

Section: Methodsmentioning

confidence: 99%

“…Chemical states of cesium sorbed in minerals have recently been investigated by various spectroscopic methods such as extended X-ray absorption fine structure (EX-AFS) [5][6][7], X-ray diffraction (XRD) and transmission electron microscopy (TEM) [8], far-infrared (FIR) spectroscopy [9], X-ray photoelectron spectroscopy (XPS) and nuclear magnetic resonance (NMR) [10]. In these spectroscopic methods, non-radioactive cesium (isotopic composition:…”

Section: Introductionmentioning

confidence: 99%

Interaction between Ultra-Trace Amount of Cesium and Oxides Studied by Total-Reflection X-Ray Photoelectron Spectroscopy

Baba

Shimoyama

Hirao

et al. 2015

e-J. Surf. Sci. Nanotech.

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In order to clarify the chemical states of radioactive cesium sorbed in minerals such as clay, soil, sand and rock, X-ray photoelectron spectra (XPS) have been measured for cesium adsorbed on SiO2 and Al2O3 (sapphire), which are major components of these minerals. Since the number of atoms in radioactive cesium ( 134 Cs or 137 Cs) is extremely small, total reflection XPS (TR-XPS) using synchrotron radiation was applied in order to measure trace amount of cesium. For SiO2 surface, it was shown that ultra-trace amount of cesium down to 205 pg·cm −2 can be detected by TR-XPS. This amount corresponds to about 400 Bq of 137 Cs (t 1/2 =30.2 y). Thus it was demonstrated that the ultra-trace amount of cesium corresponding to the radioactive cesium level can be measured by TR-XPS. As to the chemical states of cesium, the binding energy of the Cs 3d 5/2 line for cesium adsorbed on SiO2 and Al2O3 ranges from 725.2 eV to 725.5 eV irrespective of the adsorption conditions, suggesting that the cesium is adsorbed through weak Van-der-Waals force. While after rinsing the cesium-adsorbed SiO2 in water, the binding energy of the Cs 3d 5/2 line shifted by 0.8 eV to higher energy side. The result indicates that the ultra-trace amount cesium remaining after rinsing is covalently bonded with the SiO2 surface rather than ionically bonded.

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“…He concluded that Na was sorbed in the interlayer (gist = -20 ppm) and at the external clay surface (gi,o = -7 ppm). Recently, Kim et al (1996a) used 133Cs magic angle spinning (MAS) NMR spectra to investigate the adsorption sites and atomic dynamics of Cs adsorbed on illite, kaolinite, bohemite, and silica gel. They confirmed that the Cs cation is adsorbed at sites on the mineral surface, where the cation-surface bond is relatively strong (Stem layer) and at distant sites in the diffuse layer, where the Cs-surface bond is weaker (Gouy layer).…”

Section: Introductionmentioning

confidence: 99%

Nuclear Magnetic Resonance (NMR) Study of Cd²⁺ Sorption on Montmorillonite

Leo¹,

O’Brien

1999

Clays and clay miner.

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Abstrac~z13Cd solid-state nuclear magnetic resonance (NMR) was used to identify possible Cd 2+ adsorption sites in montmorillonite. The montmorillonite was treated with 0.1 and 1 M CdC12 aqueous solutions and samples with 13 and 8-txm particle size were used. The data are consistent with a two-site model for sorption of Cd 2+ on montmorillonite. Cd 2+ is localized in the montmorillonite in two different sites: 1) in the interlayers as hydrated Cd z+ and 2) on the external surface, probably with few H20 molecules hydrating to it. Cadmium is also adsorbed as CdC1 + in the interlayer. Treatment with a 0.1 M CdClz solution produces adsorption of free Cd 2+ in the interlayer whereas treatment with 1 M CdCI2 resulted in adsorption of Cd 2+ in both the interlayer and on surface sites and the adsorption of CdC1 + in the interlayer. A larger particle size favors Cd z+ adsorption on the external surface whereas a smaller particle size favors Cd 2+ adsorption in the interlayer.

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133Cs NMR and XPS investigation of cesium adsorbed on clay minerals and related phases

Cited by 121 publications

References 46 publications

Physicochemical characterization of the retardation of aqueous Cs+ ions by natural kaolinite and clinoptilolite minerals

Physicochemical characterization of the retardation of aqueous Cs+ ions by natural kaolinite and clinoptilolite minerals

Interaction between Ultra-Trace Amount of Cesium and Oxides Studied by Total-Reflection X-Ray Photoelectron Spectroscopy

Nuclear Magnetic Resonance (NMR) Study of Cd²⁺ Sorption on Montmorillonite

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133Cs NMR and XPS investigation of cesium adsorbed on clay minerals and related phases

Cited by 121 publications

References 46 publications

Physicochemical characterization of the retardation of aqueous Cs+ ions by natural kaolinite and clinoptilolite minerals

Physicochemical characterization of the retardation of aqueous Cs+ ions by natural kaolinite and clinoptilolite minerals

Interaction between Ultra-Trace Amount of Cesium and Oxides Studied by Total-Reflection X-Ray Photoelectron Spectroscopy

Nuclear Magnetic Resonance (NMR) Study of Cd2+ Sorption on Montmorillonite

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Nuclear Magnetic Resonance (NMR) Study of Cd²⁺ Sorption on Montmorillonite