Photocatalytic Degradation of Polynitrophenols on Various Commercial Suspended or Deposited Titania Catalysts Using Artificial and Solar Light

Table 4

Initial COD values in mgO₂/L for nitrophenols having the same initial ponderal concentration (30 mg/L). Apparent first-order rate constant 𝐾_app and corresponding specific one 𝐾_app/𝑔_cat.

	COD initial (mg/L)	P25		PC500		Paper 1048
		𝐾app (mn^-1)	𝐾app/g (mn^−1⋅g^−1)	𝐾app (mn^-1)	𝐾app/g (mn^−1⋅g^−1)	𝐾app (mn^-1)	𝐾app/g (mn^−1⋅g^−1)
Phenol (PH)	74	0.50	1.0	1.15	2.30	0.80	0.94
4-nitrophenol (PNP)	50	0.80	1.6	1.73	3.46	1.12	1.31
2,4-dinitrophenol (DNP)	45	1.28	2.5	2.19	4.38	1.66	1.95
2,4,6-trinitrophenol (TNP)	30	1.84	3.7	3.14	6.28	3.62	4.25