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Carbon-doped P25, a visible-light-driven photocatalyst, was prepared to remove methyl ethyl ketone (MEK) from the indoor air environment. The effect of key parameters such as carbon content, relative humidity and light type on the photocatalyst efficiency, reaction rate and by-products generation rate were evaluated. C-doped P25 photocatalysts coated on nickel foam enhanced photocatalytic degradation and the reaction rate of gas-phase MEK under visible and UV light, compared with a commercial P25 coated on the same substrate material. The results indicate that the photocatalytic degradation efficiency and the reaction rate of all examined photocatalysts under UV light are higher than visible light. All the experiments were carried out in two continuous reactors with a small residence time (0.025 s), 2.95 mg/m³ (1000 ppb) inlet contaminant concentration and at four different relative humidity levels (0, 20 …