Facile microwave-assisted production of Fe sub(3)O sub(4) decorated porous melamine-based covalent organic framework for highly selective removal of Hg super(2+)

Well dispersed magnetic Fe sub(3)O sub(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 super(2) g super(-1) and good magnetic separation performance (M sub(S) = 0.75-3.59 em u g super(-1)). Adsorption properties were preliminarily tested by the adsorptive removal of heavy metal ions from waste water. Remarkably, the as-synthesized Fe sub(3)O sub(4)/M-COFs display highly selective adsorption of Hg super(2+) with high adsorption capacity (97.65 mg g super(-1)). This highly selective removal of Hg super(2+) was caused by the high density of N group in M-COFs. In addition, this selective adsorption of Hg super(2+) was not interfered with other metal ions such as Na super(+), Cd super(2+), Zn super(2+), Ni super(2+), Pb super(2+), Mg super(2+) and Cr super(3+).