Removal of 17β-Estradiol (E2) from Aqueous Solutions Using Potassium Permanganate Combined with Ultraviolet (KMnO₄/UV)

Table 3

Degradation kinetic parameters of E2 in presence of coexisting materials for optimum pH.

Steroid estrogen	Salt	pH	Reaction order	Kinetic equation	Reaction rate constant (K)	R^2	Half-life (min)
E2	CaCl2	4	Zero	y = −0.006x + 0.5982	0.006 (mg.L/min)	0.56	83
			First	y = 0.0235x + 0.6459	0.0235 (1/min)	0.86	29
			Second	y = 0.1773x + 0.5377	0.1773 (L/mg.min)	0.98	6
	MnCl2	4	Zero	y = −0.0061x + 0.6095	0.0061 (mg.L/min)	0.58	82
			First	y = 0.023x + 0.6294	0.023 (1/min)	0.84	30
			Second	y = 0.1581x + 1.0959	0.1581 (L/mg.min)	0.94	6
	FeCl2	4	Zero	y = −0.0057x + 0.5774	0.0057 (mg.L/min)	0.52	88
			First	y = 0.0218x + 0.7036	0.0218 (1/min)	0.85	32
			Second	y = 0.1646x + 0.4241	0.1646 (L/mg.min)	0.95	6
	MgCl2	4	Zero	y = −0.0047x + 0.7072	0.0047 (mg.L/min)	0.61	106
			First	y = 0.0096x + 0.3972	0.0096 (1/min)	0.77	72
			Second	y = 0.0228x + 1.4903	0.0228 (L/mg.min)	0.92	44
	FeCl3	4	Zero	y = −0.0052x + 0.6498	0.0052 (mg.L/min)	0.56	96
			First	y = 0.0126x + 0.5436	0.0126 (1/min)	0.75	55
			Second	y = 0.0395x + 1.7977	0.0395	0.92	25