Fabrication of bimetallic-doped materials derived from two polymorphic Ni-Mo-based coordination polymers for enhanced dye removal and gaseous iodine capture

Abstract

Two polymorphic Ni–Mo-based coordination polymers (CPs) based on the ligand N,N′-bis(4-pyridinecarboxamide)-1,2-cyclohexane (4-bpah) were created using hydrothermal synthesis. Each of these CPs (denoted as Ni–Mo-1 and Ni–Mo-2) has the similar main framework [Ni(4-bpah)2(Mo2O7)], but they each show different crystalline phases with different 2D grid windows. Moreover, the Ni–Mo-based CP-derived carbon-based composites (C–Ni–Mo-X-Y, X = 1 or 2 and Y = 400, 450, or 500) were prepared by thermal cracking and “low-temperature” calcination below 500 °C using two CPs as precursors. The results show that the Ni–Mo-based CP-derived carbon-based composites prepared at different temperatures exhibit irregular morphologies with different micron-sized or nano-sized loose structures and chemical compositions. Furthermore, the dye and gas iodine adsorption properties of the C–Ni–Mo-X-Y composites were investigated in detail.