Photocatalytic Activity and Characterization of Carbon-Modified Titania for Visible-Light-Active Photodegradation of Nitrogen Oxides

Table 2

The elemental surface composition and atomic ratio of O/Ti resulted from XPS analysis.

Sample	Ti (%)	O (%)	N (%)	C (%)	O/Ti
UV100	15.7	58.9	1.4	24.0	3.8
2-C3	20.6	52.7	—	26.7	2.6
C3	18.8	49.9	—	31.3	2.7
2-C4	16.7	49.3	—	34.0	3.0
iC4	11.4	49.9	—	38.7	4.3
2-C6	16.0	52.6	—	31.4	3.3
C6	12.1	45.2	—	42.7	3.7
cC6	14.0	42.3	—	43.7	3.0