Zirconium and silver co-doped TiO2 nanoparticles as visible light catalyst for reduction of 4-nitrophenol, degradation of methyl orange and methylene blue.

•Simple sol–gel synthesis of Zr and Ag co-doped TiO2 nanoparticles is described.•Effective photocatalysis for the reduction of nitrophenol and degradation of dyes shown.•Recycling of photocatalyst up to 4 cycles discussed as promising industrial application.