Photoreduction of Cr(VI) Ions in Aqueous Solutions by UV/TiO₂ Photocatalytic Processes

Table 1

The rate constant of reduction and nonreduction on the Cr(VI) concentration after the doping of metallic ions.

	Reduced			Nonreduced
	0.5%	2.0%	5.0%	0.5%	2.0%	5.0%
Cu	0.110	0.101	0.129	0.111	0.097	0.104
Ag	0.131	0.129	0.156	0.107	0.123	0.136