Surface Modification Effects on CNTs Adsorption of Methylene Blue and Phenol

Table 13

Comparison of the first-order, second-order, and intraparticle diffusion rate constants values for phenol adsorption on 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
0.0531	5.44	10.82	0.0103	0.8527
0.2657	45.25	23.63	0.0043	0.6548
0.5313	81.79	33.56	0.0037	0.4587

(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)
0.0531	5.44	5.12	5.12	0.002033	0.7377
0.2656	45.25	41.56	41.56	0.001299	0.9671
0.5313	81.79	74.67	74.67	0.001092	0.9747

(c)

𝐶0 (mmol/L)	Intraparticle diffusion
	𝑘𝑖 (mmol/kg/min^0.5)	𝐶𝑖 (mmol/kg)	𝑅^2
0.0531	4.657	3.100	0.8158
0.2656	20.206	14.201	0.7506
0.5313	19.841	34.175	0.5829