Surface Modification Effects on CNTs Adsorption of Methylene Blue and Phenol

Table 8

Comparison of the first-order, second-order, and intraparticle diffusion rate constants values for MB adsorption on CNT-A-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	29.24	8.94	0.0164	0.8205
0.0781	80.64	36.92	0.0152	0.9065
0.1563	110.96	34.87	0.0125	0.7755

(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	29.24	28.07	0.0013	0.9900	10.1213
0.0782	80.64	81.63	0.0014	0.9819	9.5904
0.1563	110.96	110.87	0.0017	0.9760	21.1965

(c)

𝐶0 (mmol/L)	Intraparticle diffusion
	𝑘𝑖 (mmol/kg/min^0.5)	𝐶𝑖 (mmol/kg)	𝑅^2
0.0156	0.974	16.4302	0.4938
0.0782	3.498	34.2598	0.7114
0.1563	4.267	56.1451	0.6067