Electrochemical detection and photochemical detoxification of hexavalent chromium (Cr(vi)) by Ag doped TiO2 nanoparticles

Abstract

We are proposing a simple, green and one pot ionothermal protocol for the synthesis of Ag doped TiO₂ nanoparticles. The prepared material was characterized by various spectroscopic techniques like P-XRD and XPS and then the electrocatalytic reduction and photocatalytic detoxification ability of the material towards Cr(VI) were explored. Amperometric studies showed a linear range from 0.1 to 3.1 μM, and limits of detection and quantification of 0.01 μM and 0.033 μM, respectively. The material also showed better photochemical reduction of Cr(VI) in sunlight compared to UV light. About 90% reduction of Cr(VI) to Cr(III) was observed in 120 min in sunlight whereas 88% reduction was obtained in UV light in the same time. The Ag doped TiO₂ nanoparticle modified glassy carbon has been used for electrochemical monitoring of Cr(VI) in natural water samples.