Electrical Removal Behavior of Carbon Nanotube and Carbon Nanofiber Film in CuCl₂ Solution: Kinetics and Thermodynamics Study

Table 3

Parameters determined from Langmuir and Freundlich isotherms of CNT-CNF film electrodes in CuCl₂ solution (𝑞_𝑒 is the amount of adsorbed CuCl₂ per unit mass of CNT-CNF film; 𝑞_𝑚 is the maximum removal capacity corresponding to complete monolayer coverage; 𝐾_𝐿 and 𝐾_𝐹 are Langmuir constant and Freundlich constant; 𝑟² is correlation coefficients).

Isotherm	Model equation	Parameter	280 K	290 K	300 K
Langmuir	𝑞𝑒=(𝑞𝑚𝐾𝐿𝐶𝑒)/(1+𝐾𝐿𝐶𝑒)	𝑞𝑚 (mg/g)	2.30	5.38	8.96
		𝐾𝐿 (L/mg)	0.0345	0.0326	0.0305
		𝑟^2	0.9963	0.9852	0.9918
Freundlich	𝑞𝑒=𝐾𝐹𝐶𝑒^1/𝑛	𝐾𝐹	0.3848	0.34	0.9309
		1/𝑛	0.3122	0.4415	0.4172
		𝑟^2	0.9584	0.9728	0.9483