Effect of photocatalysts (UV light; TiO₂ IL; 0.5%, 1%, 5%, and 10% Fe³⁺/IL; and 1% Cu²⁺/IL) on the percentage of phenol degradation as a function of time.

Time (min)	% Phenol photodegradation
	UV light	TiO2 IL	0.5% Fe3+	5% Fe3+	10% Fe3+	1% Fe3+	1% Cu2+
0	100	100	100	100	100	100	100
15	93.5	92.6	79.4	77.5	98.5	70.0	87.5
60	81.4	79.8	70.0	57.2	83.9	45.4	78.7
120	63.2	55.2	58.9	56.9	67.8	38.0	10.3
180	57.7	47.8	56.1	55.0	59.8	32.5	0.1