Comparison of adsorption behavior of multiple inorganic ions on kaolinite and silica in the presence of humic acid using the multitracer technique

Takahashi, Yoshio; Minai, Yoshitaka; Ambe, S.; Makide, Yoshihiro; Ambe, F.

doi:10.1016/s0016-7037(99)00065-4

Cited by 224 publications

(152 citation statements)

References 55 publications

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“…The same study revealed that the presence of humic acids at high concentrations and pH > 5 reduced the amount of sorbed 90 Sr ions [5]. Another work have also estimated that the organic-inorganic complex made up of kaolinite particles coated with humic substances, plays an important role in the behavior of various ions (including Sr 2+ ) in the environment [6]. In a study to reveal the effect of loading on the sorption of strontium by kaolinite, it was stated that the fraction of this element retained on the solids increased with decreasing radio-element ( 90 Sr) concentration and that the sorption data were fitted to the Freundlich isotherm model [7].…”

Section: Introductionmentioning

confidence: 84%

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Kinetic and thermodynamic investigations of strontium ions retention by natural kaolinite and clinoptilolite minerals

Akar¹,

Shahwan²,

Eroğlu³

2005

Radiochimica Acta

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Sr2+ / Sorption / Kaolinite / Clinoptilolite Summary. The current study was devoted to the determination of various thermodynamic and kinetic parameters resulting from the fixation of Sr 2+ by natural samples of kaolinite and clinoptilolite minerals. The sorption process followed pseudo second order kinetics, with faster sorption on kaolinite compared to clinoptilolite, where the uptake is affected by intraparticle diffusion. Freundlich and Dubinin-Radushkevich isotherm models described the data more adequately than Langmuir model, and clinoptilolite showed a higher strontium sorption capacity than kaolinite. Thermodynamically, the activation energy of Sr 2+ sorption by kaolinite and clinoptilolite were respectively, −8.5 and −18.4 kJ/mol. The sorption process on both minerals was spontaneous and endothermic at all the studied concentrations, with ∆H• being 11.3 and 9.8 kJ/mol, for sorption on kaolinite and clinoptilolite, respectively. The findings of this study were compared with those of an earlier study on the uptake of Cs + by the same minerals.

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Section: Introductionmentioning

confidence: 84%

“…[3][4][5][6][7][8][9][10][11][12][13][14][15]. Although these studies have provided valuable information about various macroscopic and microscopic aspects of the fixation behavior of this ion, only a limited area was devoted to reveal the kinetic and thermodynamic characteristics of the sorption process.…”

Section: Introductionmentioning

confidence: 99%

Kinetic and thermodynamic investigations of strontium ions retention by natural kaolinite and clinoptilolite minerals

Akar¹,

Shahwan²,

Eroğlu³

2005

Radiochimica Acta

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“…Among them, radioactive cesium is particularly problematic because of the large quantity released, its relatively long half-life (30.2 yr for Cs-137), and its emission of gamma-rays with high energy. The adsorption and desorption of cesium are strongly dependent on the host materials and the surrounding environment (Kim and Kirkpatrick, 1997;Dumat and Staunton, 1999;Takahashi et al, 1999;Giannakopoulou et al, 2007;Bellenger and Saunton, 2008). Hence, to understand the state and fate of radioactive cesium in the environment at present and in the future, it is essential to determine which types of materials are sorbing radioactive cesium in Fukushima.…”

Section: Introductionmentioning

confidence: 99%

Mineralogical characterization of radioactive particles from Fukushima soil using µ–XRD with synchrotron radiation

Motai

Mukai

Watanuki

et al. 2016

Journal of Mineralogical and Petrological Sciences

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Radioactive particles of around 50 µm size were collected from highly contaminated soil in the Fukushima Prefecture, Japan, and characterized using micro X-ray diffraction with synchrotron radiation (SR-µ-XRD). Two-dimensional diffraction patterns from individual particles rotated during X-ray irradiation were recorded on a flat imaging plate and a one-dimensional diffraction profile, as a function of 2θ, was derived from the pattern. Weathered biotite (WB) particles with plate-like morphology showed a broad peak corresponding to a basal reflection with d = 10-14 Å, indicating various degrees of vermiculitization. Another peak of~7 Å was also detected in these WB particles, suggesting the parallel growth of kaolinite in the biotite particles. These characteristics were also found in the WB collected from an Abukuma granitic body, which is widespread in the eastern part of Fukushima. SR-µ-XRD of radioactive soil particles consisting of fine minerals or of those rich in organic matter indicated that these particles contain very fine 2:1 type clay minerals alongside detrital rockforming minerals such as quartz and feldspar.

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“…Sheppard et al, (1990) found no indication of sorption for a large number of Canadian soil types, whatever the organic matter content. Takahashi et al, (1999) and showed that TcO Ϫ 4 is not complexed with humic acid, but remains free in the soil solution under aerobic conditions. Complexation of TcO Ϫ 4 with humic acid and other dissolved organic carbon is only possible when the Eh-value becomes negative (E 0 =Ϫ0.50 V for Tc(VII)/Tc(IV)), (Rößler et al, 2000).…”

Section: Tc In Aerobic and Anaerobic Soilsmentioning

confidence: 99%

Soil availability, plant uptake and soil to plant transfer of 99Tc—A review

Bennett

Willey

2003

Journal of Environmental Radioactivity

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Comparison of adsorption behavior of multiple inorganic ions on kaolinite and silica in the presence of humic acid using the multitracer technique

Cited by 224 publications

References 55 publications

Kinetic and thermodynamic investigations of strontium ions retention by natural kaolinite and clinoptilolite minerals

Kinetic and thermodynamic investigations of strontium ions retention by natural kaolinite and clinoptilolite minerals

Mineralogical characterization of radioactive particles from Fukushima soil using µ–XRD with synchrotron radiation

Soil availability, plant uptake and soil to plant transfer of 99Tc—A review

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