| Summary: | We have synthesized sulfonamide based nano-composites of SiO<sub>2</sub> and TiO<sub>2</sub> for selective and sensitive determination of toxic metal ion Hg<sup>2+</sup> in aqueous medium. Nano-composites <b>(11)</b> and <b>(12)</b> 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 <b>(11)</b> and <b>(12)</b>, both were evaluated as “turn-on” fluorescence detector for the toxic Hg<sup>2+</sup> ions. The LODs were calculated to be 41.2 and 18.8 nM, respectively of nano-composites <b>(11)</b> and <b>(12)</b>. The detection limit of TiO<sub>2</sub> based nano-composites was found comparatively lower than the SiO<sub>2</sub> based nano-composites.
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