Facile microwave-assisted production of Fe3O4 decorated porous melamine-based covalent organic framework for highly selective removal of Hg2

Well dispersed magnetic Fe 3 O 4 decorated porous melamine-based covalent organic frameworks (M-COFs) were facilely fabricated through a microwave-assisted process. The result showed that magnetic M-COFs possess large surface areas of 344–600 m 2 g −1 and good magnetic separation performance ( M S = 0.75–3.59 emu g −1 ). Adsorption properties were preliminarily tested by the adsorptive removal of heavy metal ions from waste water. Remarkably, the as-synthesized Fe 3 O 4 /M-COFs display highly selective adsorption of Hg 2+ with high adsorption capacity (97.65 mg g −1 ). This highly selective removal of Hg 2+ was caused by the high density of N group in M-COFs. In addition, this selective adsorption of Hg 2+ was not interfered with other metal ions such as Na + , Cd 2+ , Zn 2+ , Ni 2+ , Pb 2+ , Mg 2+ and Cr 3+ .