Surface Modification Effects on CNTs Adsorption of Methylene Blue and Phenol

Table 9

Comparison of the first-order, second-order, and intraparticle diffusion rate constants values for phenol 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
0.0532	5.86	12.00	0.0050	0.6874
0.2656	42.55	22.36	0.0016	0.4109
0.5313	49.66	41.29	0.0023	0.9876

(b)

𝐶0 (mmol/L)	Pseudo-second-order kinetic
	𝑞𝑒,exp (mmol/kg)	𝑞𝑒,calc (mmol/kg)	𝑘2 (kg/mmol · min)	𝑅^2	ℎ (mg/g · min)
0.0531	5.86	3.46	0.001562	0.8157	0.1859
0.2656	42.55	34.28	0.001365	0.9103	1.6056
0.5313	49.66	40.68	0.000329	0.7982	0.5419

(c)

𝐶0 (mmol/L)	Intraparticle diffusion
	𝑘𝑖 (mmol/kg/min^0.5)	𝐶𝑖 (mmol/kg)	𝑅^2
0.0531	0.594	5.7815	0.6382
0.2656	1.117	14.2365	0.5577
0.5313	1.920	1.2953	0.8389