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

Fluorescence Based Comparative Sensing Behavior of the Nano-Composites of SiO2 and TiO2 towards Toxic Hg2+ Ions