Titania (TiO2)-graphene oxide (GO) composites have been synthesized by the sol–gel method and characterized by XRD, SEM, EDS, BET, and UV-Vis DRS. Experiments investigated photocatalytic reduction of nitrite and explored the mechanisms of enhancement of photocatalysis by graphene oxide. Results showed that nitrite conversion and selectivity for N2 could be up to 97.80% and 92.66% under the optimal conditions. Photocatalytic efficiency of TiO2-GO was found to be significantly higher compared with pure TiO2. Results could be important for wastewater treatment where reducing conditions may commonly occur.
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