Table 2.

Comparison of photocatalytic activities of CdS nanoparticles with other methods.

№	Synthetic Method	Experimental Conditions		Precursors	Degraded Dye, Concentration	Photocatalytic Efficiency	Rate Constant (min−1)	[Ref]
		Time	Temperature (°C)
1	Composite-molten-salt (CMS)	24–72 h	160–220	Cd(NO3)2·4H2O, Na2S·9H2O, LiNO3, KNO3	MB, 4 mg/L	76.3%@140 min	-	[62]
					RhB, 8 mg/L	94.9%@140 min	-
2	Solvothermal	6 h	180	CdCl2·5H2O, CS(NH2)2	MB, 6 mg/L	95%@80 min	0.0365	[63]
3	One-step solid-state reaction	30 min	-	Cd(CH3COO)2·2H2O, Na2S2O3·5H2O	RhB, 10 mg/L	95%@80 min	0.0429	[64]
4	Biogenic synthesis	72 h	28	Strain of T. Harzianum, CdCl2, Na2S	MB, 10 mg/L	37.15%@60 min	0.0076	[59]
5	Hydrothermal	24 h	-	Cd(Ac)2·2H2O, PVP-K30, CS(NH2)2	MO, 20 mg/L	93.3%@240 min	-	[65]
6	Sonochemical	1 h	RT	Cd(CH3COO)2, Na2S, tryptophan	MO, 5 × 10−6 M	75.33%@240 min	0.0062	[66]
7	Photochemical	24 h	-	CdSO4, Na2S2O3	MO, 8 × 10−6 M	26.3%@70 min	0.0058	[67]
8	Commercial CdS	-	-	-	MO, 10 mg/L	78%@90 min	-	[68]
9	Mechanochemical	5 min	RT	Cd(CH3COO)2·2H2O, Na2S·9H2O, Na2S2O3·5H2O, C6H8O7	Orange II, 10 mg/L	93%@180 min	0.018	this work