Figure 2From: Facile synthesis and enhanced visible light photocatalytic activity of N and Zr co-doped TiO2 nanostructures from nanotubular titanic acid precursors TEM images of NTA precursor (a) and 0.6%Zr/N-TiO 2 prepared at 400°C (b), 500°C (c), and 600°C (d). Back to article page