Theiss Frederick L, Ayoko Godwin A, Frost Ray L
Discipline of Nanotechnology and Molecular Science, School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology (QUT), Brisbane, Queensland 4001, Australia.
Discipline of Nanotechnology and Molecular Science, School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology (QUT), Brisbane, Queensland 4001, Australia.
Mater Sci Eng C Mater Biol Appl. 2017 Aug 1;77:1228-1234. doi: 10.1016/j.msec.2017.03.284. Epub 2017 Mar 31.
In this article, the authors report the adsorption of iodide by Mg/Al LDHs and thermally activated LDH materials in laboratory scale batch experiments. The optimal Mg/Al cation ratio was 3:1while the percentage iodide uptake increased with increasing adsorbent dose up to 1g/20mL of solution. The effect of initial iodide concentration was investigated using the Langmuir and Freundlich adsorption isotherm models, while the pseudo second order kinetic model appeared to provide the best fit for the experimental data. High iodide uptake of over 80% could be achieved without completely eliminating dissolved or atmospheric carbonate and leaching of I from LDHs did not appear to be a significant problem over the period of 28days investigated. These results demonstrate that LDHs, which are already commercially available in large quantities, are a technology that shows considerable promise for the removal of radioiodine from aqueous solution.
在本文中，作者报告了在实验室规模的批量实验中，镁铝层状双氢氧化物（Mg/Al LDHs）和热活化LDH材料对碘化物的吸附情况。最佳镁铝阳离子比为3:1，而碘化物的摄取百分比随着吸附剂剂量的增加而增加，直至达到1g/20mL溶液。使用朗缪尔和弗伦德里希吸附等温线模型研究了初始碘化物浓度的影响，而伪二级动力学模型似乎最符合实验数据。在不完全去除溶解的或大气中的碳酸盐的情况下，碘化物摄取率可高达80%以上，并且在所研究的28天内，碘从LDHs中的浸出似乎不是一个重大问题。这些结果表明，已大量商业化的LDHs是一种在从水溶液中去除放射性碘方面显示出巨大潜力的技术。
