Surface Modification Effects on CNTs Adsorption of Methylene Blue and Phenol

Table 11

Comparison of the first-order, second-order, and intraparticle diffusion rate constants values for MB adsorption CNT-E-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	28.34	16.83	0.0180	0.9758
0.0781	105.41	95.09	0.0153	0.9045
0.1563	106.99	79.73	0.0117	0.9361

(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)
0.0156	28.34	29.49	0.002559	0.9788	2.2429
0.0782	105.41	113.28	0.000288	0.9897	3.7008
0.1563	106.99	110.87	0.000352	0.9841	4.1673

(c)

𝐶0 (mmol/L)	Intraparticle diffusion
	𝑘𝑖 (mmol/kg/min^0.5)	𝐶𝑖 (mmol/kg)	𝑅^2
0.0156	1.370	9.832	0.8338
0.0781	5.945	14.991	0.9696
0.1563	5.838	18.487	0.9331