Foam separation of radio-molybdenum oxyanions (99MoO42−) incorporated into Co(II)/Al(III) layered double hydroxide using anionic surfactant

IF 1.6 3区工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Applied Radiation and Isotopes Pub Date : 2024-10-28 DOI:10.1016/j.apradiso.2024.111577

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引用次数: 0

Abstract

Foam separation of radio-molybdenum oxyanions (⁹⁹MoO₄²⁻) incorporated into in-situ formed Co(II)/Al(III) layered double hydroxide (LDH) particles was applied for recovery of these anionic species from aqueous solutions. The results showed that Co(II)/Al(III) molar ratios of 2 and 2.5 resulted into not only high recovery values for ⁹⁹MoO₄²⁻ (R > 0.97), but also high decontamination factor (DF = 33 and 36, respectively). Almost complete recovery was achieved for ⁹⁹MoO₄²⁻ coprecipitated with Co(II)/Al(III) LDH in the pH range 9.9–10.5. Ageing time of 5 min was sufficient to completely coprecipitate the concerned anionic species. Sodium dodecyl sulfate (SDS) concentrations in the range 1.5 × 10⁻³ - 3 × 10⁻³ mol/L had the ability to efficiently form hydrophobic ⁹⁹MoO₄^2--Co(II)/Al(III)-LDH particles, where recovery values of about 0.96 were achieved with high DF values. The influence of the coexistence of different foreign anions (Cl⁻, NO₃⁻, HCO₃⁻, CO₃²⁻ and SO₄²⁻) during coprecipitation process of ⁹⁹MoO₄²⁻ and foam separation of the resultant particles was investigated. The suggested strategy in the present study was effectively applied for recovery of ⁹⁹MoO₄²⁻ anions from ground water (R ≈ 0.98 and enrichment ratio (ER ≈ 7172) and radioactive process wastewater (R ≈ 0.96 and ER = 3887). Based on characterization of Co(II)/Al(III) LDH using Fourier transform infrared (FTIR) and X-ray diffraction (XRD) before and after foam separation process using SDS and the obtained data, the recovery mechanism of ⁹⁹MoO₄²⁻ was proposed.

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使用阴离子表面活性剂对掺入 Co(II)/Al(III) 双层氢氧化物中的放射性钼氧阴离子 (99MoO42-) 进行泡沫分离。

采用泡沫分离法分离原位形成的 Co(II)/Al(III) 双层氢氧化物（LDH）颗粒中的放射性钼氧阴离子（99MoO42-），以从水溶液中回收这些阴离子物种。结果表明，Co(II)/Al(III) 摩尔比分别为 2 和 2.5 时，不仅 99MoO42- 的回收率高（R > 0.97），而且去污系数也高（DF = 33 和 36）。在 pH 值为 9.9-10.5 的范围内，99MoO42- 与 Co(II)/Al(III) LDH 共沉淀几乎实现了完全回收。5 分钟的老化时间足以完全共沉淀相关的阴离子物种。十二烷基硫酸钠（SDS）的浓度范围为 1.5 × 10-3 - 3 × 10-3 mol/L，能够有效地形成疏水性 99MoO42--Co(II)/Al(III)--LDH颗粒，其回收率约为 0.96，DF 值较高。研究了 99MoO42- 共沉淀过程中不同外来阴离子（Cl-、NO3-、HCO3-、CO32- 和 SO42-）共存的影响以及所得颗粒的泡沫分离。本研究建议的策略有效地用于从地下水（R ≈ 0.98，富集比 (ER ≈ 7172)）和放射性工艺废水（R ≈ 0.96，ER = 3887）中回收 99MoO42- 阴离子。根据使用 SDS 进行泡沫分离前后 Co(II)/Al(III) LDH 的傅立叶变换红外光谱 (FTIR) 和 X 射线衍射 (XRD) 表征以及获得的数据，提出了 99MoO42- 的回收机制。

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来源期刊

Applied Radiation and Isotopes 工程技术-核科学技术

CiteScore

3.00

自引率

12.50%

发文量

406

审稿时长

13.5 months

期刊介绍： Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.