School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Beijing National Laboratory for Molecular Sciences, Fundamental Science Laboratory on Radiochemistry & Radiation Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
J Hazard Mater. 2017 Apr 15;328:21-28. doi: 10.1016/j.jhazmat.2016.12.065. Epub 2017 Jan 3.
In order to improve the removal capacity of CuO for I anions from water, Cu/CuO hybrids have been synthesized through a facile hydrothermal route, characterized by using SEM, XRD, XPS, and applied to remove I anions under different experimental environments. The results demonstrate that the Cu content and morphology of samples can be tuned by the adding amount of ammonia. Meanwhile, the possible crystalline mechanism, CuO formed firstly and then metallic Cu generated, was presented. With the increasing of Cu doped amount, the removal capacity of Cu/CuO hybrids increased significantly from 0.02mmolg to 0.18mmolg. Furthermore, a reaction mechanism of I anions and CuO, which generated from the disproportionation reaction of metallic Cu and CuO, has been proposed according to the characterization analyses of the composites before and after adsorption, explaining the highly efficient removal of I anions. In addition, Cu/CuO hybrids showed excellent selectivity for I anions in the presence of large concentrations of competitive anions such as SO and NO and could work in an acidic and neutral environment. This study is hopefully to prompt CuO to grow up to be a new and highly efficient adsorbent for the removal of iodide from solutions.
为了提高氧化铜（CuO）对水中碘离子（I-）的去除能力，通过简便的水热法合成了 Cu/CuO 混合物，并用 SEM、XRD、XPS 对其进行了表征，并应用于不同实验环境下的碘离子去除。结果表明，通过添加氨的量可以调节样品的 Cu 含量和形貌。同时，提出了可能的结晶机制，即首先形成 CuO，然后生成金属 Cu。随着 Cu 掺杂量的增加，Cu/CuO 混合物的去除能力从 0.02mmol/g 显著提高到 0.18mmol/g。此外，根据吸附前后复合材料的表征分析，提出了碘离子与氧化铜（CuO）的反应机理，即金属 Cu 和 CuO 之间的歧化反应生成 CuO，解释了碘离子的高效去除。此外，在存在大量 SO和 NO等竞争阴离子的情况下，Cu/CuO 混合物对碘离子具有优异的选择性，并且可以在酸性和中性环境中工作。本研究有望促使 CuO 成长为一种从溶液中去除碘化物的新型高效吸附剂。
