Abatement of Azo Dye from Wastewater Using Bimetal-Chitosan

Table 5

Kinetic details of OII dye adsorption onto BCP.

Model	Pseudo-first order			Pseudo-second order			Elovich
Plot	(𝑡/𝑞𝑡) versus 𝑡			(𝑡/𝑞𝑡) versus 𝑡			𝑞𝑡 versus ln 𝑡
Conc.	50	100	200	50	100	200	50	100	200
Fitted model	ln(𝑞𝑒−𝑞𝑡)=1.079−0.075𝑡	ln(𝑞𝑒−𝑞𝑡)=1.09−0.045𝑡	ln(𝑞𝑒−𝑞𝑡)=2.309−0.025𝑡	𝑡/𝑞𝑡=0.078+0.066𝑡	𝑡/𝑞𝑡=0.053+0.051𝑡	𝑡/𝑞𝑡=0.037+0.028𝑡	𝑞𝑡=0.078+51.26ln𝑡	𝑞𝑡=0.063+103.72ln𝑡	𝑞𝑡=0.981+146.7ln𝑡
𝑅^2	0.885	0.882	0.875	0.995	0.991	0.988	0.993	0.985	0.980
Constant	𝑘1=−0.075	𝑘1=−0.045	𝑘1=−0.025	𝑘2=0.056	𝑘2=0.049	𝑘2=0.021	𝛽=51.26	𝛽=103.72	𝛽=146.7
𝑞𝑒(𝑞𝑒,cal)	2.94	2.97	10.06	15.15	19.6	35.7	𝛼=0.0195	𝛼=0.0097	𝛼=0.0068
𝑞𝑒(𝑞𝑒,exp)	34.1	42.1	57.1	16.4	22.1	36.1	34.1	34.1	34.1
ARE (%)	46.70	49.34	55.20	3.11	4.08	4.88	4.15	4.46	4.90

All units as described in Section 3.5.