Fluorescence Based Comparative Sensing Behavior of the Nano-Composites of SiO and TiO towards Toxic Hg Ions.

We have synthesized sulfonamide based nano-composites of SiO and TiO for selective and sensitive determination of toxic metal ion Hg in aqueous medium. Nano-composites and were morphologically characterized with FT-IR, solid state NMR, UV-vis, FE SEM, TEM, EDX, BET, pXRD and elemental analysis. The comparative sensing behavior, pH effect and sensor concentrations were carried out with fluorescence signaling on spectrofluorometer and nano-composites and , both were evaluated as "turn-on" fluorescence detector for the toxic Hg ions. The LODs were calculated to be 41.2 and 18.8 nM, respectively of nano-composites and . The detection limit of TiO based nano-composites was found comparatively lower than the SiO based nano-composites.