kumari, Sandhyawasini (2026) Defect-engineered ZnO: Synergistic charge dynamics and surface reactivity for rhodamine B degradation and Pb2+ detection. Surfaces and Interfaces, 80.

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Abstract

In this study, ZnO nanomaterials synthesized at varying calcination temperatures (450 °C to 600 °C) were evaluated for their dual functionality in photocatalytic degradation of Rhodamine B (RhB) and electrochemical detection of Pb2+ ions. Among the four samples, ZnO-2 (calcined at 500 °C) exhibited superior performance, which was attributed to its optimized crystallinity, surface area and defect structure. Radical scavenging experiments were employed to elucidate the photocatalytic mechanism, revealing that hydroxyl radicals (•OH) and photogenerated holes (h⁺) played a dominant role in RhB degradation, while singlet oxygen (1O₂) contributed marginally. The enhanced activity of ZnO-2 was further supported by XRD, BET, TEM, XPS, CV, CA and EIS analyses, confirming its efficient charge transport, lower recombination and high surface reactivity. These findings establish ZnO-2 as a promising multifunctional material for environmental remediation and heavy metal sensing applications.

Item Type:	Article
Subjects:	Calibration Cell
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	07 Jul 2026 04:34
Last Modified:	07 Jul 2026 04:34
URI:	https://cimfr.csircentral.net/id/eprint/3035

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