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<p>The adsorption of thorium by forest soil (FS) and its inorganic components (FS-Ox) was investigated. To the best of our knowledge, no studies have been published on thorium adsorption by geomaterials. The soil (FS) was treated with hydrogen peroxide solution to eliminate the organic matter (FS-Ox). The soil (FS) and the one treated with hydrogen peroxide (FS-Ox) were characterized by X-ray diffraction, scanning electron microscopy-energy dispersive spectroscopy X-ray, and Fourier-transformed infrared spectroscopy. The minerals found in the materials were quartz, albite, and kaolinite; the points of zero charge (PZC) were 6.1 and 5.3 for FS and FS-Ox, respectively, and their organic carbon content were 15.6 and &lt; 0.2%, respectively. The best conditions for the adsorption of thorium were [Th]<sub>i</sub> from 2.9 × 10<sup>–4</sup> to 2.9 × 10<sup>–3</sup>&#xa0;M, pH<sub>final</sub> = 2.1, and 291&#xa0;K. Higher concentrations of [Th]<sub>i</sub> and temperature provoked a gradual decrease of adsorption. The adsorption kinetic data for FS and FS-Ox were best adjusted to the Elovich and pseudo second-order models, respectively; the isotherms data to the Langmuir–Freundlich model, indicating a chemical adsorption mechanism on heterogeneous materials. The maximum adsorption capacity was higher for FS-Ox (9.4 ± 0.4 mg g<sup>−1</sup>) than FS (7.0 ± 0.2 mg g<sup>−1</sup>); the results show that thorium is mainly retained in the inorganic matter of the soil. Humic acid, Na<sub>2</sub>H<sub>2</sub>EDTA, citric acid, and sodium oxalate solutions are efficient desorbents for thorium from both Th/FS and Th/FS-Ox. This research contributes to the knowledge of contamination, decontamination and remediation of soils.</p>

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Influence of the Organic Matter on the Behavior of Thorium in a Natural Soil

  • 期刊论文

  • 发表日期：

    2025年8月9日

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  • Perla Tatiana Almazán-Sánchez,
  • Melania Jiménez-Reyes,
  • Jaime Jiménez-Becerril,
  • Marcos Solache-Ríos

摘要

The adsorption of thorium by forest soil (FS) and its inorganic components (FS-Ox) was investigated. To the best of our knowledge, no studies have been published on thorium adsorption by geomaterials. The soil (FS) was treated with hydrogen peroxide solution to eliminate the organic matter (FS-Ox). The soil (FS) and the one treated with hydrogen peroxide (FS-Ox) were characterized by X-ray diffraction, scanning electron microscopy-energy dispersive spectroscopy X-ray, and Fourier-transformed infrared spectroscopy. The minerals found in the materials were quartz, albite, and kaolinite; the points of zero charge (PZC) were 6.1 and 5.3 for FS and FS-Ox, respectively, and their organic carbon content were 15.6 and < 0.2%, respectively. The best conditions for the adsorption of thorium were [Th]i from 2.9 × 10–4 to 2.9 × 10–3 M, pHfinal = 2.1, and 291 K. Higher concentrations of [Th]i and temperature provoked a gradual decrease of adsorption. The adsorption kinetic data for FS and FS-Ox were best adjusted to the Elovich and pseudo second-order models, respectively; the isotherms data to the Langmuir–Freundlich model, indicating a chemical adsorption mechanism on heterogeneous materials. The maximum adsorption capacity was higher for FS-Ox (9.4 ± 0.4 mg g−1) than FS (7.0 ± 0.2 mg g−1); the results show that thorium is mainly retained in the inorganic matter of the soil. Humic acid, Na2H2EDTA, citric acid, and sodium oxalate solutions are efficient desorbents for thorium from both Th/FS and Th/FS-Ox. This research contributes to the knowledge of contamination, decontamination and remediation of soils.