Table 6.

Kinetic and calculated data for pseudo-first-order and pseudo-second-order kinetic model plots (solution initial pH = 4.0 and initial dye concentration = 40 mg/L).

Time (min)	Final dye concentration (mg/l)	q t (mg/g)	Log (qe − qt)	t/qt (min/(mg/g))
20	15.383	0.615	−0.725	35.52
40	12.262	0.693	−0.958	57.72
60	10.114	0.747	−1.252	80.32
80	9.845	0.753	−1.301	106.24
100	7.899	0.803	—	124.53
120	7.899	0.803	—	149.44