Percentage mass/mass of chemical elements present in TiO₂ NPs/BMI·BF₄ IL, 1% Fe³⁺-doped TiO₂ NPs/BMI·BF₄ IL and 1% Cu²⁺-doped TiO₂ NPs/BMI·BF₄ IL analyzed by SEM/EDX.

Material	Element chemical	%m/m
TiO2 NPs/BMI·BF4 IL	Ti	54.9
	O	36.31
1% Fe3+-doped TiO2 NPs/BMI·BF4 IL	Ti	46.73
	O	38.09
	Fe	0.85
1% Cu2+-doped TiO2 NPs/BMI·BF4 IL	Ti	50.48
	O	37.87
	Cu	0.69