Surface Modification Effects on CNTs Adsorption of Methylene Blue and Phenol

Table 7

Comparison of the first-order, second-order and intraparticle diffusion rate constants values for MB adsorption on CNT-A-AM at different initial concentration.

(a)

𝐶0 (mmol/L)	Pseudo-first-order kinetic
	𝑞𝑒,exp (mmol/kg)	𝑞𝑒,calc (mmol/kg)	𝑘1 (min^−1)	𝑅^2
0.0156	27.02	18.13	0.0141	0.9712
0.0782	66.72	39.43	0.0113	0.9509
0.1563	72.28	40.26	0.0080	0.8853

(b)

𝐶0 (mmol/; L)	Pseudo-second-order kinetic
	𝑞𝑒,exp (mmol/kg)	𝑞𝑒,calc (mmol/kg)	𝑞𝑒,exp (mmol/kg)	𝑅^2	𝑞𝑒,exp (mmol/kg)
0.0156	27.02	27.94	0.002123	0.9931	1.5501
0.0782	66.72	67.53	0.009173	0.9718	4.1832
0.1563	72.28	69.94	0.000908	0.9394	4.4436

(c)

𝐶0 (mmol/L)	Intraparticle diffusion
	𝑘𝑖 (mmol/kg/min^0.5)	Ci (mmol/kg)	𝑅^2
0.0156	1.368	7.3303	0.9010
0.0782	3.171	20.1845	0.8775
0.1563	3.191	22.1716	0.8485