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

Table 1

Characterization of the band gap, specific surface area, and weight loss in TGA.

Sample	Band gap^b (eV)	Specific surface area  (m^2/g)	Weight loss^a (wt.%, between 200 and 800°C)
			Total	200–380°C	380–600°C	600–800°C
UV100	3.26	249	4.23	2.33	1.01	0.90
2-C3	3.24	252	3.53	1.71	0.95	0.87
C3	3.24	272	4.84	2.10	2.18	0.57
2-C4	3.24	279	4.88	2.13	2.18	0.58
iC4	3.23	298	5.73	2.86	2.01	0.89
2-C6	3.18	290	5.71	2.44	2.69	0.58
C6	3.07	294	7.73	3.70	3.18	0.86
cC6	3.04	297	6.82	2.91	3.27	0.64

^aAll samples were pretreated at 200°C before test.
^bDetermined by the intercept in Tauc Plot.