Table 4.

Colour parameters at different adsorption conditions of the dye solution.

Adsorption conditions		Colour parameters
Adsorbent dose 4 (g L−1), temperature 295 K	Contact time (min)	L*	a*	b*
	0	84.35 ± 0.04	1.65 ± 0.01	− 6.73 ± 0.01
	30	86.04 ± 0.01	0.83 ± 0.01	− 4.51 ± 0.01
	60	87.29 ± 0.02	0.61 ± 0.01	− 3.65 ± 0.01
Contact time 60 min, temperature 295 K	Adsorbent dose (g L−1)	L*	a*	b*
	2	85.44 ± 0.01	0.87 ± 0.01	− 3.71 ± 0.01
	6	86.65 ± 0.01	0.52 ± 0.02	− 2.85 ± 0.01
	10	88.85 ± 0.01	0.16 ± 0.01	− 1.92 ± 0.01
Contact time 60 min, adsorbent dose 4 (g L−1)	Temperature (K)	L*	a*	b*
	283	85.54 ± 0.02	0.87 ± 0.01	− 4.87 ± 0.01
	295	86.65 ± 0.01	0.52 ± 0.02	− 2.85 ± 0.01
	309	87.45 ± 0.01	0.31 ± 0.01	− 2.04 ± 0.01