Application of Sludge-Based Adsorbent for Acid Red 18 Adsorption

Figures & Tables

Kinetics model	Parameter	100 mg/L	700 mg/L
Pseudo-first-order	q_e	38.5	78.0
	k₁	0.1114	0.0684
	R²	0.851	0.911
	RMSE	0.70	1.03
Pseudo-second-order	q_e	43.8	93.6
	k₂	0.0028	0.00070
	R²	0.973	0.986
	RMSE	0.29	0.41

Isotherm model	Parameter	Unit	Values of parameters
Freundlich	1/n	-	0.108
	K_f	mg^(1–1/n)L^(1/n)/g	35.89
	R²	-	0.892
	RMSE	-	3.23
Langmuir	q_m	mg/g	71.6
	K_L	L/mg	0.0944
	R²	-	0.928
	RMSE	-	2.64
Jovanovic	q_max	mg/g	69.0
	K_J	L/g	0.0666
	R²	-	0.796
	RMSE	-	4.44
Dubinin- Radushkevich	Q_s	mg/g	69.0
	KDR	mol²/kJ²	17.77
	E	kJ/mol	0.17
	R²	-	0.815
	RMSE	-	4.20
Sips	qmS	mg/g	78.1
	K_s	L/mg	0.2675
	SP	-	0.572
	R²	-	0.967
	RMSE	-	1.78
Toth	qmT	mg/g	79.0
	K_t	L/mg	0.5054
	t	-	0.510
	R²	-	0.967
	RMSE	-	1.78