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影响因子：12.2

DOI码：10.1021/acs.est.4c07

发表刊物：Environmental Science & Technology

摘要：Here, we examine how radiation impacts the dissolution behavior of boehmite by subjecting dry nanoparticles of different sizes to 60Co 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.

合写作者：Ping Chen, Xiang Wang, Hanna Hlushko, Jay A LaVerne, Lili Liu, Carolyn I Pearce, Zheming Wang

第一作者：Yatong Zhao

论文类型：期刊论文

通讯作者：Kevin M Rosso, Xin Zhang

学科门类：工学

文献类型：J

卷号：58

期号：49

页面范围：21760-21769

是否译文：否

发表时间：2024-11-26

收录刊物：SCI

发布期刊链接：https://pubs.acs.org/doi/full/10.1021/acs.est.4c07544