Cu-Zn bimetal ZIFs derived nanowhisker zero-valent copper decorated ZnO nanocomposites induced oxygen activation for high-efficiency iodide elimination
Cu-Zn bimetal ZIFs derived nanowhisker zero-valent copper decorated ZnO nanocomposites induced oxygen activation for high-efficiency iodide elimination
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铜锌双金属 ZIF 衍生的纳米晶须零价铜修饰的 ZnO 纳米复合材料诱导氧活化以高效消除碘化物
DOI：
10.1016/j.jhazmat.2021.126097
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发表时间：
2021-05-27
影响因子：
13.6
通讯作者：
Yang, Yi
中科院分区：
文献类型：
--
作者：
Chen, Jiuyu;Gu, Aotian;Yang, Yi
铜基吸附剂去除碘离子的研究已有几十年的历史，但其吸附性能不理想和不可重复使用性仍然是大规模实际应用的主要障碍。在这里，提出了一种有效的技术，用于消除碘使用纳米晶须零价铜（nwZVC）修饰的ZnO纳米复合材料通过两步热解的CuZnZnZIFs前体获得。对合成的材料进行了广泛的表征，结果清楚地表明，纳米ZVC在ZnO基体中分散良好，并且可以通过调节ZIF前驱体中Cu/Zn的摩尔比来调节纳米ZVC的形貌和量。后续的批式吸附实验表明，在氧气充足的条件下，所得材料表现出270.8 mg g-1的高吸附容量，以及高选择性、强耐酸性和良好的可重复使用性。机理研究表明，该材料对I-的去除是吸附与氧化耦合的过程，nwZVC的存在是其原因之一，nwZVC可以激活分子氧生成H2 O2，同时释放Cu+，使I被释放的Cu+吸附，并被H2 O2氧化。
Studies on the elimination of iodide anions (I-) by Cu-based adsorbents have been conducted for decades, however its unsatisfactory adsorption performance and its non-reusability are still the main obstacles for largescale practical applications. Here, an efficient technique was proposed for the elimination of iodide using nanowhisker zero-valent copper (nwZVC) decorated ZnO nanocomposites obtained by two steps pyrolysis of CuZn bimetal ZIFs precursors. The as-synthesized materials were extensively characterized and the results clearly revealed that nanoscale ZVC were well-dispersed in the ZnO matrix, and the morphology and the amount of nanoscale ZVC could be tuned by adjusting the molar ratio of Cu/Zn in ZIF precursors. The following batch adsorption experiments demonstrated that the resultant materials exhibited high adsorption capacity of 270.8 mg g-1 under condition of adequate oxygen, as well as high selectivity, strong acidity resistance and an excellent reusability. The mechanism investigations revealed that the elimination of I- by as-fabricated materials involved adsorption process coupled with oxidation, and the existence of nwZVC was responsible for this since nwZVC could activate molecular oxygen to generate H2O2 accompanied by the release of Cu+, thus leading to Iadsorbed by the released Cu+ and oxidized by the H2O2.