TABLE 5.

Photocatalytic results of 3-pyridinemethanol (0.5 mM) oxidation under UVA light with TiO₂-50V-3h, TiO₂-60V-3h, TiO₂-60V-5h, and the commercial photocatalysts prepared at different calcination treatment temperatures.

Photocatalyst	-r0x103 (mM·h−1)	kx103 (h−1)	X1h (%)	X3h (%)	aS3-Pyridinemethanal, (%)		bSVitamin B3, (%)		cpH X3h
					X0.15	X0.30	X0.15	X0.30
No photocatalyst	0	0	0	0					7
TiO2-50V-3h-25	15	52	3	15	88		11		6.7
TiO2-50V-3h-250	91	156	16	38	90	87	7	11	6.7
TiO2-50V-3h-500	98	121	15	32	52	53	12	11	7
TiO2-50V-3h-700	77	111	12	29	51	52	13	11	6.9
TiO2-60V-3h-25	23	45	3	14	89		11		5.7
TiO2-60V-3h-250	87	144	15	36	89	85	7	11	6.1
TiO2-60V-3h-500	79	110	13	29	60	58	10	10	7
TiO2-60V-3h-700	58	100	10	26	63	62	9	9	7
TiO2-60V-5h-25	47	107	9	27	72	74	8	9	5.0
TiO2-60V-5h-100	31	108	7	27	84	79	11	11	4.5
TiO2-60V-5h-150	54	148	11	38	85	82	11	12	4.7
TiO2-60V-5h-200	92	273	17	56	81	77	10	12	5.9
TiO2-60V-5h-250	124	276	23	57	85	80	11	12	5.5
TiO2-60V-5h-300	86	189	16	44	78	71	12	15	5.6
TiO2-60V-5h-500	94	139	16	35	53	53	10	12	5.4
TiO2-60V-5h-700	75	96	11	26	54	55	10	11	6.3
Merck	54	86	9	23	55	54	8	8	7
Degussa P25	298	596	48	84	40	39	11	11	7

−r₀: initial reaction rate, k: pseudo-first-order rate constant, ^aS_{3-Pyridinemethanal} and ^bS_{Vitamin B3}: selectivities towards 3-pyridinemethanal and vitamin B₃ for 15% (X_0.15) and 30% (X_0.30) conversions. X_1h and X_3h: Conversion values after 1 and 3 h of reaction, respectively. ^cpH: pH value measured after 3 h of reaction (X_3h).