Relationship between Synthesis Conditions and Photocatalytic Activity of Nanocrystalline TiO₂

Table 3

Physicochemical properties of the TiO₂ nanoparticles synthesized with different pH conditions. The TiO₂ synthesis was carried out with a molar ratio (water and TTIP) of 5 and at a calcination temperature of 600^°C.

pH	Phase content^a	𝑆bBET (m^2 g^−1)	Pore volume^b (mm^3 g^−1)	Crystalline size^c (nm)
2.5	(A): 100	32.2	45	13.2
4	(A): 100	25.5	33	17.0
7	(A): 100	38.2	69	18.0
9	(A): 33.2	16.8	28	(A): 21.4
	(R): 66.8			(R): 23.0
11	(A): 10.3	46.3	58	(A): 22.1
	(R): 89.7			(R): 28.5

^aA and R represent anatase and rutile, respectively.
^bValue calculated from nitrogen adsorption isotherm.
^cValue calculated using the Scherrer’s equation [22].