Nitrogen-Doped Carbonaceous Materials for Removal of Phenol from Aqueous Solutions

Table 2

Freundlich and Langmuir parameters for the adsorption of phenol.

Adsorbent	Freundlich isotherm parameters			Langmuir isotherm parameters
	𝐾𝐹 (mg/g)(L/mg)^1/𝑛	𝑛	𝑅^2	𝐾𝐿 (L/g)	𝑎𝐿· (L/mg)	𝑅^2
BK	28.08	4.151	0.950	2.848	0.041	0.963
BKN	40.07	5.767	0.935	4.389	0.055	0.990
BKNA	30.78	3.582	0.927	1.740	0.014	0.919
BK(NO)	22.94	2.689	0.936	2.212	0.205	0.963
BK(NO)A	13.73	1.454	0.987	1.305	0.047	0.920

𝐾_𝐹, n—Freundlich isotherm constants; 𝐾_𝐿, 𝑎_𝐿—Langmuir isotherm constants, R—correlation coefficient.