Noble Metal Decoration and Presulfation on TiO₂: Increased Photocatalytic Activity and Efficient Esterification of n-Butanol with Citric Acid

Table 2

Amount of S groups on prepared catalysts.

Samples	Amount (μmol/g)	S groups (per nm^2)
TiO2	201	0.71
Ag-TiO2 ((Ag) = 0.5%)	296	1.32
Au-TiO2 ((Au) = 0.5%)	804	2.71
Rh-TiO2 ((Rh) = 0.5%)	542	1.87
Pt-TiO2 ((Pt) = 0.5%)	664	2.05