Hydrothermal Preparation of Visible-Light-Driven N-Br-Codoped TiO₂ Photocatalysts

Table 1

Results of XPS analysis using Ar etching, sample TNB.

Name	Content/%
	Br	N
Before etching	0.31	3.68
First etching	0.11	1.81
Second etching	0	1.79
Third etching	0	1.17