Recent literatures on CeO₂ development for the adsorption of AO7 dye.

Authors	Operating conditions	Adsorption efficiencies (%)	S BET (m2 g−1)
Cai48et al.	[CeO2] = 0.5 g L−1; [AO7] = 35 mg L−1; V = 50 mL; T = —; in the dark; no pH pre-adjustments; t = 2 h	∼23	67
Hu49et al.	[CeO2] = 1.0 g L−1; [AO7] = 35 mg L−1; V = 60 mL; at room temperature; in the dark; no pH pre-adjustments; t = 1 h	∼40	63
Arul50,51et al.	[CeO2] = ∼0.67 g L−1; [AO7] = ∼105 mg L−1; V = 15 mL; T = —; in the dark; no pH pre-adjustments; t = 10 h	Almost zero	52
Wang52et al.	[CeO2] = 0.5 g L−1; [AO7] = 35 mg L−1; V = 50 mL; T = —; in the dark; pH = 6.35; t = 1 h	44–56	40–46
Ge53et al.	[CeO2] = 0.5 g L−1; [AO7] = 35 mg L−1; V = 50 mL; T = —; in the dark; pH = 4.0; t = ∼27 h	∼50	57.5
Yao54et al.	[CeO2] = 8.0 g L−1; [AO7] = 60 mg L−1; V = 25 mL; T = 25 °C; in the dark; pH = —; t = 1 h	∼13.3	54.58
Wen55et al.	[CeO2] = 0.5 g L−1; [AO7] = 40 mg L−1; V = 20 mL; T = —; in the dark; pH = 5.0; t = 1 h	∼20	<67.8
Zang56et al.	[CeO2] = 0.5 g L−1; [AO7] = 40 mg L−1; V = 50 mL; T = 313 K; in the dark; no pH pre-adjustments; t = 1 h	12.5–37.5	—