Table 7.

Doped Bi-based nanostructured photocatalysts for remediation of dye pollution.

Photocatalyst	Target dye pollutant	Optimum experimental conditions	Source of light	Degradation (%)	Ref.
Remarks on active species
Ag-BiOCl	rhodamine B	treatment time: 100 min; dosage of catalyst: 1 g/L; initial concentration of dye: 9.6 mg/L	visible light	99	[133]
The photogenerated electrons converted adsorbed oxygen into •O2− radicals and with h+ contributed to the degradation process.
Ce/Bi2O3, Nd/Bi2O3	Acid Yellow 29, Coomassie brilliant blue (G250), Acid Green 25	Reaction time: 120 min; dosage of catalyst: 1 g/L; the initial concentration of Acid Yellow 29: 0.1425 × 10−3 mg/L., of Coomassie brilliant blue (G250): 0.427 × 10−4 mg/L, and of Acid Green 25: 0.156 × 10−3 mg/L	visible light (halogen lamp)	82.0–88.0, 74.0–84.0	[134]
•O2−, h+ and •OH were the active species during the degradation process.
B/BiOBr	rhodamine B	optimum reaction time: 30 min; dosage of catalyst: 1 g/L; initial concentration of dye: 15 mg/L	visible light	99.3	[153]
•OH played the main role in the degradation of rhodamine B.
B/BiOCl	rhodamine B	optimum reaction time: 100 min; dosage of catalyst: 0.4 g/L; initial concentration of dye: 20 mg/L	visible light	81.5	[154]
•O2− played the main role in the degradation of rhodamine B.
C/BiOI	methyl orange	optimum reaction time: 60 min; dosage of catalyst: 0.1 g/L; initial concentration of dye: 10 mg/L.	visible light	99.8	[155]
•O2− and holes played the main role in the degradation of methyl orange.
In-BiOI	methyl orange	optimum reaction time: 120 min; dosage of catalyst: 0.1 g/L; initial concentration of dye: 10 mg/L.	visible light	96.0	[150]
•O2− and holes played the main role in the degradation of methyl orange.