Isotherm parameters for orthophosphate adsorption by hydrochars.

Isotherm parameters		pH 3			pH 5			pH 8
		HC	PRHC	POHC	HC	PRHC	POHC	HC	PRHC	POHC
Freundlich	R 2	0.580	0.410	0.665	0.911	0.997	0.997	0.844	0.993	0.996
	K f (mg1−1/n L1/n g−1)	1.351	1.343	1.418	1.365	1.404	1.607	1.251	1.211	1.298
	n	3.516	2.558	2.396	3.185	2.496	2.706	3.257	2.378	2.257
Langmuir	R 2	0.984	0.997	0.986	0.996	0.987	0.975	0.985	0.994	0.996
	X m (mg g−1)	6.845	11.669	14.641	8.230	13.405	15.106	6.557	11.148	13.793
	K l (L g−1)	0.140	0.105	0.070	0.133	0.081	0.049	0.201	0.150	0.093
	R l	0.510	0.448	0.493	0.478	0.479	0.576	0.431	0.374	0.438
Temkin	R 2	0.815	0.994	0.984	0.933	0.988	0.967	0.851	0.998	0.996
	B (kJ mol−1)	1.798	0.971	0.785	1.457	0.860	0.816	1.801	0.991	0.801
	K t (L g−1)	1.685	1.458	1.459	1.225	1.405	1.139	1.179	2.004	1.894