A visible-light-responsive cadmium cobaltite photocatalyst was synthesized via a simple wet chemical precipitation method and evaluated for the degradation of Evans blue dye. Structural and optical analyses (XRD, FTIR, UV–Vis and SEM) confirmed the formation of a crystalline phase with enhanced visible-light absorption. Under visible-light irradiation, the photocatalyst achieved a maximum degradation efficiency of 96% within 100 min at pH 9, following pseudo-first-order kinetics with an apparent rate constant of 0.0213 min⁻¹. Parametric investigations revealed that alkaline conditions, optimized catalyst dosage and lower initial dye concentration significantly enhanced photocatalytic performance. The improved activity is attributed to efficient photo-induced charge separation and the generation of reactive oxygen species (•OH and •O₂⁻), which play a dominant role in dye mineralization. Additionally, the catalyst exhibited good photo-stability and reusability, demonstrating its potential for sustainable wastewater remediation.

Keywords: Photocatalysis; Evans Blue Dye; Cadmium Cobaltite;