Due to the presence of non-bonded electrons in such molecules, they may coordinate to the metal cations forming a stable ligand–cation covalent bond[26], allowing the removal of metal species. In spite of the current great success acquired by organofunctionalized materials, they still present a serious drawback in detriment of their wide application,which is the use of costly high purity reagents and solvents involved in their manufacturing. Furthermore, the synthesis and functionalization of such materials are usually associated to the generation of toxic residues [27].