Two-dimensional metal-organic framework nanobelts for selective Fe3+ removal from aqueous solution with high adsorption capacity
Two-dimensional metal-organic framework nanobelts for selective Fe3+ removal from aqueous solution with high adsorption capacity
复制标题
二维金属有机骨架纳米带高吸附能力选择性去除水溶液中的 Fe3
DOI：
10.1016/j.seppur.2020.116559
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发表时间：
2020-05-15
影响因子：
8.6
通讯作者：
Zheng, Liyan
中科院分区：
文献类型：
--
作者：
Fan, Wenwen;Liu, Xiaolan;Zheng, Liyan
超薄金属有机骨架（mof）由于其具有较大的比表面积、丰富的不饱和配位中心和更易于接近的活性位点等独特的性质而成为一类新型的二维材料，这有利于提高其催化、传感和分离性能。本研究利用MOF（命名为YNU-1纳米带）选择性去除水中的Fe3+，其吸附量为456.37 mg/g，表现出优异的吸附性能。该值是所有报道的Fe3+吸附剂中最高的，这是由于Fe3+与YNU-1纳米带表面丰富的羧基之间的配位。用拟二级动力学模型可以很好地描述吸附行为，揭示了化学吸附过程。通过x射线光电子能谱（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和元素图测量证实了吸附后的YNU-1纳米带表面存在α - fe2o3。YNU-1纳米带成功地应用于实际样品的铁处理。本研究提供了一种简便、有效的去除水中铁离子的方法。
Ultrathin metal-organic frameworks (MOFs) have emerged as a novel class of two-dimensional materials for their unique properties, such as the larger surface area, enriched unsaturated coordination centers and more accessible active sites, which are beneficial for improving their performances in catalysis, sensing and separation. In this work, the MOF (named YNU-1 nanobelts) was exploited to selectively remove Fe3+ from aqueous solutions, which showed an excellent adsorption performance with the adsorption capacity of 456.37 mg/g. The value is the highest among all reported adsorbents of Fe3+, owing to the coordination between the Fe3+ and abundant carboxyl groups on the surface of YNU-1 nanobelts. The adsorption behavior can be well-described with a pseudo-second-order kinetic model, which revealed a chemisorption process. The alpha-Fe2O3 on the surface of YNU-1 nanobelts after adsorption was confirmed by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and element mapping measurements. The YNU-1 nanobelts was successfully applied for iron treatment in real sample. Our study provided a facile and efficient method for the removal of iron ions from water.