Effect of 60 Co Irradiation on Boehmite Dissolution in Caustic Solutions.

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  • Additional Information
    • Source:
      Publisher: American Chemical Society Country of Publication: United States NLM ID: 0213155 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1520-5851 (Electronic) Linking ISSN: 0013936X NLM ISO Abbreviation: Environ Sci Technol Subsets: MEDLINE
    • Publication Information:
      Publication: Washington DC : American Chemical Society
      Original Publication: Easton, Pa. : American Chemical Society, c1967-
    • Subject Terms:
      Aluminum Oxide*/chemistry ; Aluminum Hydroxide*/chemistry; Solubility ; X-Ray Diffraction ; Gamma Rays ; Cobalt Radioisotopes/chemistry ; Kinetics ; Solutions ; Temperature
    • Abstract:
      Here, we examine how radiation impacts the dissolution behavior of boehmite by subjecting dry nanoparticles of different sizes to 60 Co γ radiation and subsequently analyzing their dissolution behavior in caustic solutions as a function of temperature. The measured kinetics show that irradiation with an amount 228.24 Mrad significantly slows the dissolution rate, particularly for smaller sizes at lower temperatures. Specifically, the temperature-dependent dissolution rates of irradiated 20 nm boehmite versus pristine material in 3 M NaOH solutions were several times lower (e.g., rate constant of 0.026 vs 0.075 h -1 at 60 °C), with an apparent activation energy 40 kJ mol -1 higher. Although various imaging techniques and X-ray diffraction measurements consistently revealed no obvious differences between pristine and irradiated samples, after irradiation significant binding energy shifts were detected in the X-ray photoelectron Spectroscopy peaks of Al 2p and O 1s, and a change in their relative intensities indicated a lower O/Al ratio. This suggests that γ-irradiation may stabilize boehmite particle surfaces by driving their chemistry and structure toward more stable aluminum oxide forms. This finding may help explain slower dissolution rates of boehmite in nuclear waste and may be useful for the development of more robust predictive models and effective strategies for waste processing.
    • Contributed Indexing:
      Keywords: 60Co irradiation; boehmite; dissolution; kinetics; nuclear waste; γ-irradiation
    • Accession Number:
      LMI26O6933 (Aluminum Oxide)
      5QB0T2IUN0 (Aluminum Hydroxide)
      63957-70-0 (aluminum oxide hydroxide)
      0 (Cobalt Radioisotopes)
      0 (Solutions)
    • Publication Date:
      Date Created: 20241126 Date Completed: 20241210 Latest Revision: 20241210
    • Publication Date:
      20241210
    • Accession Number:
      10.1021/acs.est.4c07544
    • Accession Number:
      39589262