Table 1.

Linearized isotherm coefficients for dye adsorption (Initial dye concentration 50–800 mg/L, Adsorbent mass 0.08 g/L, Contact time 20 min, Tem. 25–65 °C).

Isotherm models	Isotherm parameters	Acid red 88	Basic Violet 14	Basic Blue 54	Congo red
Langmuir model	Qm (mg/g)	1666.66	1250	1000	1250
	KL (L/mg)	0.077	0.210	0.025	0.727
	R2	0.9746	0.946	0.9699	0.9784
Freundlich model	Kf (mg/g)	169.31	240.32	34.34	364.16
	n	2.02	2.59	1.32	3.00
	R2	0.6470	0.5473	0.9009	0.5585
Tempkin model	KT (L/mg)	3.22	10.56	3.13	46.17
	bT (J/mol)	17.10	18.92	11.00	20.72
	R2	0.6716	0.6158	0.7809	0.6992
	B1	164.27	130.92	225.21	119.56
Dubinin-Radushkevich model	Qs (mg/ g)	471.11	462.66	407.15	617.20
	Kad (mol2/J2)	0.0000007	0.00000009	0.000003	0.00000006
	E (kJ/mol)	0.845	2.357	0.408	2.886
	R2	0.6784	0.6228	0.6467	0.8624
Separation factor (RL)	C0 (mg/L) 50–800	0.206–0.015	0.086–0.005	0.444–0.047	0.026–0.001

The raw data for this table is provided in the Supplementary file 2.