Surface Modification Effects on CNTs Adsorption of Methylene Blue and Phenol

Table 12

Comparison of the first-order, second-order, and intraparticle diffusion rate constants values for MB adsorption on CNT-E-HM 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	19.09	16.18	0.0191	0.9733
0.0782	42.63	47.90	0.0088	0.9123
0.1563	38.58	38.88	0.0104	0.8832

(b)

𝐶0 (mmol/L)	Pseudo-second-order kinetic
	𝑞𝑒,exp (mmol/kg)	𝑞𝑒,calc (mmol/kg)	𝑘2 (kg/mmol · min)	𝑅^2	ℎ (mmol/kg · min)
0.0156	19.09	19.76	0.019151	0.9780	7.4742
0.0782	42.63	41.14	0.008479	0.9920	14.3534
0.1563	38.58	35.68	0.011265	0.9680	14.3439

(c)

𝐶0 (mmol/L)	Intraparticle diffusion
	𝑘𝑖 (mmol/kg/min^0.5)	𝐶𝑖 (mmol/kg)	𝑅^2
0.0156	1.378	10.145	0.8067
0.0782	3.688	19.858	0.8682
0.1563	3.408	25.741	0.7939