Abatement of Azo Dye from Wastewater Using Bimetal-Chitosan

Table 4

Results of OII dye adsorption isotherm modeling.

Isotherm	Unit	Information
Langmuir model		𝐶𝑒/𝑞𝑒=1/𝐾𝐿𝑞max+𝐶𝑒/𝑞max
Plot	—	(𝐶𝑒/𝑞𝑒) versus 𝐶𝑒
Fitted model	—	𝐶𝑒/𝑞𝑒=0.0026+0.039𝐶𝑒
𝑞max	mg/g	384.6
𝐾𝐿	L/mg	0.06
𝑅^2	—	0.998
𝑅𝐿=1/1+𝐾𝐿𝐶𝑖	—	0.11–0.33
Freundlich model		ln 𝑞𝑒 = ln 𝐾𝐹 + 1/𝑛 ln 𝐶𝑒
Plot	—	ln 𝑞𝑒 versus ln 𝐶𝑒
Fitted model	—	ln 𝑞𝑒 = 3.85 + 0.4 ln 𝐶𝑒
𝐾𝑓	—	46.9
1/𝑛	mg/g L/mg^1/𝑛	2.48
𝑅^2	—	0.984
D-R model		ln𝑞𝑒=ln𝑞𝑚−𝐾DR𝜀^2
Plot	—	ln 𝑞𝑒 versus ε ^2
Fitted model	—	ln𝑞𝑒=3.53−0.0046𝜀^2
𝐾DR	mol^2/kJ^2	0.0046
𝐸 = 1/(2𝐾DR)^0.5	kJ/mol	10.42
𝑅^2	—	0.979