Removal of Fluorescein Dye from Aqueous Solutions Using Natural and Chemically Treated Pine Sawdust

Table 3

Parameters of adsorption kinetic model (PFO, PSO, LFD, and IPD) for the FD adsorption by NPS and SPS.

Kinetic models	Adsorbent
	A (NPS)	B (SPS)
qe,, exp mg g^−1	0.222	0.2323
Pseudo-first order
qe, cal mg g^−1	0.216	0.1391
K1, g/mg.min	0.051	0.0373
R^2	0.960	0.986
Pseudo-second order
qe, cal mg g^−1	0.236	0.2463
K2, g/mg.min	0.532	0.4777
h, mg g^−1.min	0.02953	0.02898
t^½	7.9778	8.4998
R^2	0.999	1
Liquid film diffusion
Klfd, 1/min	0.0374	0.0512
C, mg g^−1	0.5129	0.0272
R^2	0.986	0.960
Intraparticle diffusion
Step 1
Kipd, mg g^−1.min^1/2	0.010	0.095
C, mg g^−1	0.124	0.139
R^2	0.968	0.985
Step 2
Kipd, mg g^−1.min^1/2	0.0004	0.0016
C, mg g^−1	0.217	0.213
R^2	0.908	0.860