Srishti , Ms. and Kumari, Shweta and Pathak, Sumit Kumar and Chatterjee, Abhishikta and Gupta, Varun Kumar and Kumar, Aditya and Sinhamahapatra, Apurba (2026) Highly dispersed Cu on TiO₂ for photoreduction of hexavalent chromium in the presence of glycerol. Journal of Environmental Chemical Engineering, 14 (5).

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Abstract

Highly dispersed Cu species on TiO2 were prepared in situ and evaluated for the photocatalytic reduction of toxic hexavalent chromium [Cr(VI)] in the presence of glycerol. At a low Cu loading of approximately 1 wt%, the catalyst exhibited a high pseudo-first-order reduction rate constant of 0.1288 min−1 under UV–Vis irradiation. Structural and spectroscopic analyses indicate that Cu is predominantly stabilized as isolated, highly dispersed species on TiO2, rather than as nanoparticles or larger aggregates. Glycerol plays a dual role as a sacrificial hole scavenger and coordination agent: its hydroxyl groups can interact with Cu2+, moderating Cu reduction kinetics during photodeposition and suppressing uncontrolled nanoparticle growth. The enhanced Cr(VI) reduction is attributed to improved interfacial charge separation, shallow electron trapping by Cu+/Cu0 redox-active centers, formation of glycerol radical (induced by hole) as active species for reduction, and favorable Cr(VI) adsorption at the catalyst surface. Notably, the optimized Cu/TiO2 system achieved > 99% Cr(VI) photoreduction under natural sunlight, demonstrating its potential as a sustainable, energy-efficient, and cost-effective non-noble-metal photocatalyst for solar-driven remediation of chromium-contaminated water.

Item Type:	Article
Uncontrolled Keywords:	Photocatalysis; Cr(VI) reduction; Highly dispersed copper; Cu/TiO₂; Glycerol-assisted photoreduction
Subjects:	Chemicals and Liquid Fuels Envieronmental Management Group
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	16 Oct 2026 05:32
Last Modified:	16 Oct 2026 05:34
URI:	https://cimfr.csircentral.net/id/eprint/3055

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