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. 2014 Dec 3;9(12):e113888. doi: 10.1371/journal.pone.0113888

Table 4. Regression parameters of isotherms for expressing adsorption of solution NH₄ ⁺-N to W-BC, C-BC and P-BC at different pyrolytic temperatures.

Biochars	Temp. (°C)	Freundlich model			Langmuir model
		n	K_F (L mg⁻¹)	R²	Q_m (mg g⁻¹)	K_L (L mg⁻¹)	R²
W-BC	400	1.5375	0.0954	0.9612	7.3314	0.0042	0.7709
	500	1.6717	0.0872	0.9398	4.6838	0.0050	0.8180
	600	1.7253	0.0789	0.9716	3.1636	0.0070	0.9191
	700	1.6949	0.0605	0.9437	2.6448	0.0065	0.8827
C-BC	400	1.5387	0.2778	0.9730	15.4560	0.0069	0.9117
	500	1.8212	0.3246	0.9540	12.0482	0.0065	0.7892
	600	2.1110	0.4188	0.9414	8.6201	0.0099	0.8291
	700	2.1711	0.3964	0.9611	7.1685	0.0114	0.8989
P-BC	400	1.6981	0.2019	0.9544	10.5153	0.0050	0.7561
	500	1.6139	0.1226	0.9048	9.9206	0.0032	0.4877
	600	1.4440	0.0604	0.9255	7.7761	0.0026	0.4132
	700	1.4821	0.0486	0.9681	4.01445	0.0044	0.7876