Dye

 

qe,exp.
(mg/g)

Pseudo-first-order
kinetic model

Pseudo-second-order
kinetic model

k1
(min-1)

qe,cal.
(mg/g)

R2

k2
(g/mg/min)

qe,cal.
(mg/g)

R2

RR-2

2.33

0.0009

2.14

0.9914

0.0009

2.45

0.9769

RB-4

3.27

0.0021

3.26

0.9731

0.0006

3.95

0.9926

Table 4: The rate constants of pseudo-first-order kinetic model and pseudosecond- order kinetic model and correlation constants for RR-2 and RB-4 (C0= 100 mg/L; CA= 20 g/L; particle size: 355-500 µm; initial pH∼7; N= 100 rpm; T= 25°C, contact time: 48 h).