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The photocatalytic activity of nanostructured CeO₂ was investigated for the degradation of phenol and its derivatives (2-chlorophenol, 2-bromophenol and 2-nitrophenol) in the exposure of complete spectrum and visible region (420–800 nm) of sunlight. The adopted experimental parameters imparted high crystallinity, phase purity, controlled morphology and uniform particle size of ∼11 nm to the synthesized CeO₂. During the evaluation of the photocatalytic activity, the initial low degradation of the substrates till the 90 min of complete spectrum sunlight exposure followed by a piercing increase predicted the favorable photon induced surface changes in CeO₂. The careful examination of the exposed and unexposed CeO₂ by spectroscopic techniques (diffuse reflectance (DR), photoluminescence (PL), ATR-FTIR and Raman spectroscopy) and electrochemical tools (cyclic voltammetry (CV), electrochemical …