Ru-ZnO photocatalyst as well as preparation method and application thereof

The invention provides a Ru-ZnO photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalysts. The preparation method of the Ru-ZnO photocatalyst provided by the invention comprises the following steps: mixing zinc salt with oxalic acid and water, and carrying out precipitation reaction to obtain zinc oxalate; carrying out first annealing on the zinc oxalate to obtain ZnO; mixing the ZnO with ruthenium chloride and water, and carrying out oxidation-reduction reaction to obtain a precursor; and carrying out second annealing on the precursor to obtain the Ru-ZnO photocatalyst. The Ru-ZnO photocatalyst obtained by the preparation method provided by the invention can efficiently catalyze and degrade methane under simulated sunlight,and shows excellent performance of photo-catalytically purifying low-concentration methane in air at normal temperature and normal pressure; the 0.1-Ru-ZnO photocatalyst shows quite good cycling stability in ten times of cyc