Using porous adsorbents to eliminate heavy metal pollution is now receiving increasing interest. However, adsorbent showing high arsenic removal is still scarce. Especially these that can effectively remove both As(V) and As(III) are highly important for practical industrial applications but still a challenging task. In this work, we found that the crystal of Zn-MOF-74 can effectively remove both As(V) and As(III), giving corresponding adsorption capacity of 325 mg/g and 211 mg/g, respectively. Such values should present the record-high As(V) removal and the second-highest As(III) removal in the literature. The removal mechanism, as unveiled by infrared spectrum and X-ray photoelectron spectroscopy, is due to the special Zn-O-As coordination interactions between Zn(II) ions and H₂AsO₄^- or H₂AsO₃^-.

现在，使用多孔吸附剂消除重金属污染受到越来越多的关注。但是，仍然缺乏显示高砷去除率的吸附剂。尤其是那些可以有效去除As（V）和As（III）的化合物，对于实际工业应用而言非常重要，但仍然是一项艰巨的任务。在这项工作中，我们发现Zn-MOF-74晶体可以有效地去除As（V）和As（III），分别具有325  mg / g和211  mg / g的相应吸附容量。这样的值应该代表文献中创记录的高As（V）去除率和第二高的As（III）去除率。红外光谱和X射线光电子能谱揭示的去除机理是由于Zn（II）离子与H ₂ AsO之间特殊的Zn-O-As配位作用₄ ^-或H ₂ ASO ₃ ^-。