This paper reports the degradation of indigo carmine and eosin Y dyes in water, catalyzed by cobalt and multiwalled carbon nanotube modified zirconium oxide nanocomposite (Co-ZrO 2 -MWCNTs) under simulated visible light. The bare ZrO 2, ZrO 2 -MWCNTs, Co-ZrO 2 and Co-ZrO 2 -MWCNTs with different percentage compositions of cobalt were synthesized by homogeneous co-precipitation method. Characterization of the prepared nanocomposites was carried out using X-Ray powder Diffraction (XRD), Fourier

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... ansformer Infrared (FTIR) Spectroscopy, Transmission Electron Microscopy (TEM), Raman Spectroscopy, (UV-Vis)-Spectroscopy and Energy Dispersive Spectroscopy (EDS) for their structure, formation, morphology, size and elemental analysis. The experimental results indicated that all the cobalt and MWCNTs modified nanocomposites demonstrated higher photocatalytic activities compared to the bare ZrO 2 . The most efficient catalyst (0.5% Co-ZrO 2 -MWCNTs) with the band gap and Ka values of 5.21 eV and 16.86 Â 10 À 3 min À 1 respectively exhibited 98% degradation efficiency toward indigo carmine and 87% toward eosin Y in 180 min.