Table 3.

Thermodynamic parameters for the sorption of Sb(V) on biochars.

Biochar	∆G (kJ mol−1)						∆H (kJ mol−1)	∆S (Kl/mol.K)	R2	pH
	277 K	288 K	293 K	298 K	303 K	310 K
BSBC	2.92	1.54	− 0.29	− 0.71	− 1.71	− 2.83	52.8	0.18	0.98	2
ZrBSBC6.5	1.58	− 0.23	− 0.48	− 1.83	− 2.57	− 3.19	43.1	0.15	0.98	2
ZrBSBC12.5	− 0.08	− 1.31	− 1.97	− 2.78	− 3.68	− 4.54	38.3	0.14	0.99	2
Zr–FeBSBC (1:20)	− 0.78	− 2.52	− 3.86	− 4.66	− 5.67	− 7.26	53.7	0.2	0.99	4
Zr–FeCl3BSBC (1:5)	− 0.36	− 1.79	− 2.48	− 3.37	− 4.67	− 5.72	45.7	0.16	0.98	4
FeBSBC	− 0.27	− 1.45	− 2.07	− 2.42	− 2.71	− 3.41	25.6	0.09	0.99	3
FeCl3BSBC	0.67	− 0.10	− 0.37	− 1.14	− 1.94	− 2.98	31.43	0.11	0.95	3