Fabrication of a family of Cu-based materials derived from a Cu-organic framework for enhanced iodine capture

Metal-organic frameworks (MOFs) have gained a lot of attention due to their variable pore size and large surface area. Although MOFs and their derived materials have shown encouraging performance in radioiodine capture, there are still drawbacks such as poor stability, poor selectivity, low adsorption capacity and long adsorption time, as well as insufficiently systematic studies on the structural effects of doping with different functional groups as well as acid-base materials on MOFs. Thus, developing adsorbents with high iodine adsorption efficiency is a difficult issue. In this paper, a Cu-MOF ([Cu2(3-bpah)(1,4-NDC)2]center dot(1,4-H2NDC)center dot 3H2O, where 3-bpah = N,N'-bis(3-pyridylformamide)-1,2-cyclohexane, 1,4-H2NDC = 1,4-naphthalenedicarboxylic acid) was employed as the precursor and selected ammonium tetrathiomolybdate (1), hydroquinone (2), glucose (3), urea (4) for doping precursors. As a result, four different porous materials with different structures, namely Cu-1, Cu2, Cu-3 and Cu-4, were prepared by pyrolysis under 800 degrees C. Meanwhile, the structures of the materials and iodine adsorption properties were investigated in detail.