Fenton-like treatment for reduction of simulated carbon-14 spent resin
Fenton-like treatment for reduction of simulated carbon-14 spent resin
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DOI：
10.1016/j.jece.2020.104740
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发表时间：
2020-11
影响因子：
7.7
通讯作者：
M. Hafeez;J. Jeon;S. Hong;N. Hyatt;J. Heo;W. Um
中科院分区：
文献类型：
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作者：
M. Hafeez;J. Jeon;S. Hong;N. Hyatt;J. Heo;W. Um
含有14 C的废树脂是最有问题的放射性废物之一。在目前的研究中，我们成功地制备了模拟14 C负载的废树脂使用HCO 3 −，并首次模拟14 C负载的废树脂的Fenton样处理进行了比较新鲜Amberlite IRN-150树脂（没有模拟14 C负载）通过优化影响反应参数。实验结果表明，新鲜的Amberlite IRN-150树脂（没有模拟14 C负载）使用0.35 M Cu（II）催化剂，30% H2 O2作为氧化剂，在pH 2，90 ± 3 °C温度下反应4 h，达到91.26%的重量损失和85.47%的TOC去除率。然而，在类似的反应条件下，使用HCO 3-模拟的14 C负载的废树脂表现出87.34%的重量损失。模拟负载14 C的废树脂的重量损失（%）的减少归因于树脂上HCO 3-的存在，其可产生与羟基自由基相比氧化能力较低的碳酸根自由基（CO 3-CH 3），并进而影响模拟负载14 C的废树脂的类Fenton处理的功效。扫描电子显微镜和能量色散谱（SEM-EDS）和傅立叶变换红外光谱（FT-IR）分析用于表征，结果也支持树脂的降解。
Spent resins with14C are enlisted among the most problematic radioactive wastes. In current study, we successfully prepared the simulated14C-loaded spent resins using HCO3−, and for the first time the Fenton-like treatment of simulated14C-loaded spent resins were compared with fresh Amberlite IRN-150 resin (without simulated14C loading) by optimizing the influential reaction parameters. The experimental results revealed that 91.26 % weight loss and 85.47 % in TOC removal were achieved for fresh Amberlite IRN-150 resin (without simulated14C loading) using 0.35 M Cu(II) catalyst, 30 % H2O2as oxidant at pH 2, and 90 ± 3 °C temperature for 4 h reaction time. However, the simulated14C-loaded spent resin using HCO3−exhibited 87.34 % weight loss under the similar reaction conditions. The reduction in weight loss (%) of simulated14C-loaded spent resin was attributed to the presence of HCO3−on the resins, which could produce the carbonate radical (CO3-∙) of lower oxidation capability as compared to hydroxyl radical and in turn affect the efficacy of Fenton-like treatment for simulated14C-loaded spent resin. Scanning electron microscopy and energy dispersive spectroscopy (SEM-EDS) and Fourier transform infrared spectroscopy (FT-IR) analyses were used to characterize and the results also supported the resin’s degradation.