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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2024.9
- 수록면
- 167 - 171 (5page)
- DOI
- 10.23042/radin.2024.18.3.167
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초록· 키워드
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Technetium-99 (99Tc) is recognized as a critical concern in the disposal of spent nuclear fuel due toits long half-life and remarkable stability, existing predominantly as TcO4−in the natural environment. The anionicform of technetium is highly soluble and mobile, posing significant environmental risks from the viewpoint ofnuclear waste management. Thus, developing efficient and cost-effective sorbents for aqueous Tc(VII) is essentialfor mitigating relevant contamination. In the present work, the adsorption characteristics of Re(VII), a chemicalanalog of Tc(VII), were investigated using the clay mineral bentonite, modified with two different organic cations:hexadecylpyridinium (HDPy) and hexadecyltrimethylammonium (HDTMA). Sorption experiments were conductedat a liquid-to-solid ratio of 1 g/L with Re(VII) solutions prepared at concentrations from 10−4 mol/L to 10−6 mol/L. The sorption ratio and distribution coefficients were determined with samples collected at reaction times of 10,50, 100, and 500 minutes after 0.45 μm syringe filtration. In parallel, the modified bentonite samples were furtheranalyzed using the X-ray diffraction (XRD) method to understand the adsorption mechanism of Re(VII) onto thetarget minerals. According to the quantification analysis results, a rapid equilibrium reaction of aqueous Re(VII) forall modified bentonite samples was identified. Moreover, near-complete adsorption of Re(VII) was observed whenthe bentonite was modified at 200-400% of its cation exchange capacity (CEC) for both organic cations. For casesof lower modification, the HDTMA-modified bentonite showed relatively higher adsorption efficiency comparedwith the one modified with HDPy. This result was inferred to be due to the difference in inter-layer spacing basedon the characteristics of the organic cations. It is expected that the results obtained through this study will serve as apreliminary case for the synthesis of adsorbents for the retardation of highly mobile anionic radionuclides, such as Iand Tc, in the natural environment.
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