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

Table 2

Langmuir parameters of phenolic compound adsorption.

Reactants	Degussa P25			PC500			PC500/Paper 1048
	𝑞max (mg/g)	𝐾ads (L/mg)	𝑛ads (mol/nm^2)	𝑞max (mg/g)	𝐾ads (L/mg)	𝑛ads (mol/nm^2)	𝑞max (mg/g)	𝐾ads (L/mg)
Phenol	4.87	0.031	0.62	6.27	0.136	0.125	10.44	0.290
4-nitrophenol (PNP)	10.25	0.046	0.88	9.11	0.290	0.120	8.32	0.217
2,4-dinitrophenol (DNP)	15.52	0.025	1.00	11.73	0.110	0.120	6.60	2.780
2,4,6-trinitrophenol (TNP)	18.93	0.020	1.00	15.86	0.021	0.130	5.66	7.00

𝑛_ads: area density of adsorbed phenol molecules (in molecules/nm²).