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The current study emphasizes the influence of electrochemical active surface area (ECSA) on the electrochemical oxygen evolution reaction (OER) and supercapacitive performances of MnO 2 -multiwalled carbon nanotube (MC) composites.

Mesoporous silica functionalized with a 2-hydroxy-naphthyl moiety has been synthesized and characterized by standard techniques like powder X-ray diffraction, N adsorption/desorption studies, transmission electron microscopy and spectral studies like FT-IR, UV-visible, fluorescence and C andSi solid state NMR. The functionalized silica material showed significant enhancement in its emission intensity in the presence of Al ions whereas other metal ions could not bring about any increase in its emission intensity. They either quench the emission or do not alter the intensity significantly making the functionalized material a fluorescence chemosensor for Al. The sensitivity of the probe towards Al has been determined to be high with a low limit of detection value. As functionalized silica is not soluble in common solvents, it has been effectively used to bind and remove Al from a solution. Theoretical calculations on a model system have been performed to investigate the electronic spectral transitions.

Rhodamine incorporated mesoporous silica acts as a selective chemosensor for Al3+, Cr3+ and Fe3+ ions and it is used for their separation from an aqueous medium.

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