Table 3. Several studies of removal MO by photodegradation.

Material	Conditions	Efficiency, %	References
CuO/Al2O3 nanocomposite	Initial concentration: 20 mg L−1, dose of 2.0 g L−1, visible light, 3 hours	94.2%	39
Silica-titania fibers	Initial concentration: 30 mg L−1, catalyst dosage: 0.1 g L−1, UV irradiation, 8 h	98%	40
Fe3O4/TiO2 magnetic nanocatalysts	Initial concentration: 10 mg L−1, UV irradiation, 1 h	90.3%	41
TiO2 thin films	Initial concentration: 10 mg L−1, UV irradiation, 180 min	22–23%	42
LaOCl/ZnO composite	Initial concentration: 10 mg L−1, dose of 1 g L−1, simulated sunlight, 180 min	97.38%	This study