Table 4. Kinetic model constants and correlation coefficients for the adsorption of Methylene Blue and Congo Red dye on SCP

Dye	Samples	Pseudo first order			Pseudo second order			Ref.
		qe (mg/g)	K1 (1/min)	R2	qe (mg/g)	K2 (g/mg/min)	R2
Methylene Blue	Control	1.9763	0.1244	0.9054	2.0567	2.386	0.9478	This study
	SCPFe 10	0.1926	0.0806	0.7065	0.4218	0.0027	0.4045
	SCPFe 20	2.2085	0.0366	0.6981	8.3263	5.5031	0.0483
	SCPFe 30	1.5308	0.0458	0.9094	71.4285	199.579	0.0006
Congo Red	Control	1.2044	0.0375	0.9054	1.1470	0.1621	0.9772	This study
	SCPFe 10	1.1664	0.0806	0.7065	1.7027	0.3572	0.3431
	SCPFe 20	1.0459	0.0274	0.8947	1.0800	0.1437	0.7130
	SCPFe 30	0.6339	0.0981	0.9402	0.5766	0.0410	0.3441
Crystal Violet	Biochar	14.9	0.044	0.817	16.4	0.00321	0.884	Kyi et al. (2020)
Methylene Blue	Rice husk	17.1038	0.028	0.9848	18.1906	0.0026	0.9641	Quansah et al. (2020)
Methylene Blue	Annona squmosa seed	3.5859	0.037	0.927	4.2937	0.00113	0.9889	Santhi et al. (2016)
Acid Yellow 29	Ailanthus altissima sawdust	9.467	−5 × 10–6	0.9974	0.00179	121,876	0.9999	Rahman et al. (2021)

SCP: sawdust cellulose powder.