A sonochemical strategy was employed to synthesize hexagonal CuCrO 2 nanoplates and their graphene oxide (GO) nanocomposites (CuCrO 2 @GO) via ultrasonic‐assisted nucleation and growth, enabling precise interface coupling and efficient visible‐light photocatalysis. Structural analyses, including X‐ray diffraction (XRD), Raman spectroscopy (Raman), and Fourier‐transform infrared spectroscopy (FTIR), along with morphological characterization using scanning electron microscopy (SEM) and energy‐dispersive X‐ray spectroscopy (EDS), confirmed the formation of phase‐pure CuCrO 2 nanoplates uniformly anchored on the GO framework. The incorporation of GO induced bandgap narrowing from 2.92 eV to 2.23 eV, enhancing visible‐light absorption and charge‐carrier separation. Photocatalytic performance was evaluated against methylene blue (MB), rhodamine B (RB), Congo red (azo dye), and safranin dyes under natural sunlight, achieving 91%–96% degradation within 36–50 min at neutral pH using optimized catalyst loading (0.25 g L −1 ). Kinetic analysis revealed high pseudo‐first‐order rate constants ( k = 0.96–0.99 min −1 ), consistent with a nonselective, radical‐driven degradation mechanism. Band‐alignment analysis indicated that the CuCrO 2 –GO Type‐II heterojunction promotes directional charge transfer and suppresses electron–hole recombination. The photocatalyst retained activity over five cycles, confirming stability and reusability. This study demonstrates precision interface design in delafossite–GO heterostructures and establishes an efficient, solar‐driven pathway for broad‐spectrum wastewater remediation, surpassing conventional Cu‐based photocatalysts.
Shah et al. (Sun,) studied this question.