A Fluorescent Chemosensor Based on Functionalized Nanoporous Silica (SBA-15 SBA-IC-MN) for Detection of Hg2+ in Aqueous Media

A highly ordered mesoporous silica SBA-15 was modified by indole-3-carbaldehyde followed by covalent grafting of malononitrile to prepare organic-inorganic hybrid nanomaterial (SBA-IC-MN). The characterization of the product presented the successful attachment of organic moieties at the surface of SBA-15 and the preservation of the original structure of SBA-15. The optical sensing ability of SBA-IC-MN was examined via different metal ions in H2O medium by fluorescence spectroscopy. SBA-IC-MN can be considered as highly selective and sensitive toward Hg2+ ions with a detection limit of 3.26 x 10(-6). Further, excellent linearity was obtained between the fluorescence intensity of SBA-IC-MN and the concentration of Hg2+ ion.

Automated summary

The highly ordered mesoporous silica SBA-15 was modified with indole-3-carbaldehyde and covalently grafted with malononitrile to prepare an organic-inorganic hybrid nanomaterial, SBA-IC-MN. The product successfully attached organic moieties to the surface of SBA-15 while preserving its original structure. The optical sensing ability of SBA-IC-MN was demonstrated to be highly selective and sensitive towards Hg2+ ions in H2O medium, with a detection limit of 3.26 x 10(-6) and excellent linearity with the concentration of Hg2+ ion.