The recent study enlightens the synthesis and characterization of zirconia (ZrO 2 ), Fe-doped ZrO 2 (Fe@ZrO 2 ), and Ni-doped ZrO 2 (Ni@ZrO 2 ) catalysts having new-fangled morphology with tuned band gap as photocatalysts for degradation of textile wastewater dyes methylene blue (MB), malachite green (MG), and their mixtures. SEM imaging of Fe@ZrO 2 and Ni@ZrO 2 is interestingly varied from ZrO 2 as well as doping of transition metals greatly affects the morphology of composites. The optimization study depicts that the pH, time (min) and catalyst amount (g) have a direct relation with degradation efficiency, while the dye concentration (mg/L) has an indirect relation as well. The photocatalytic studies depict that the degradation of MB and MG follows oxidation pathway via hydroxyl radicals (OH • ) and holes. Reusability of catalysts corresponds to a little decrease in degradation efficiency in the first two cycles and decreases to about $10% (Ni@ZrO 2 ) and $12% (Fe@ZrO 2 ) in next three cycles.
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