One-Step Cohydrothermal Synthesis of Nitrogen-Doped Titanium Oxide Nanotubes with Enhanced Visible Light Photocatalytic Activity

Table 1

Nitrogen physisorption properties of N-doped TC-series.

Sample	Urea (g)	𝑆BET (m^2/g)^a	𝐷BJH-ads (nm)^b	𝑉Pore (cm^3/g)^c
TC-0	0.00	207	9.2	0.48
TC-1	1.88	292	15.0	1.01
TC-1(400)	1.88	73	31.8	0.57

^aBET surface area calculated from the linear part of BET plot.
^bEstimated using the adsorption branch of the isotherm by BJH method.
^cSingle-point total pore volume of pores at 𝑃/𝑃₀ = 0.97.