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

Table 5

Degradation kinetic parameters of E2 in presence of HA for acidic and neutral pH.

Steroid estrogen	Organic acid	pH	Reaction order	Kinetic equation	Reaction rate constant (K)	R^2	Half-life (min)
E2	HA	4	Zero	y = −0.0057x + 0.5104	0.0057 (mg.L/min)	0.45	88
			First	y = 0.0529x + 0.7484	0.0529 (1/min)	0.95	13
			Second	y = 5.9484x − 139.65	5.9484 (L/mg.min)	0.79	0.2
	FA	4	Zero	y = −0.0062x + 0.6543	0.0062 (mg.L/min)	0.66	81
			First	y = 0.0245x + 0.3082	0.0245 (1/min)	0.93	28
			Second	y = 0.2105x − 2.9462	0.2105 (L/mg.min)	0.66	5
	HA & FA	4	Zero	y = −0.0059x + 0.5396	0.0059 (mg.L/min)	0.49	85
			First	y = 0.055x + 0.1377	0.055 (1/min)	0.92	13
			Second	y = 9.276x − 278.06	9.276 (L/mg.min)	0.56	0.1