Valorizing Rice Straw and Its Anaerobically Digested Residues for Biochar to Remove Pb(II) from Aqueous Solution

Table 1

Physicochemical properties of biochars produced at different temperatures.

	Yield	Ash			EC	pH	SA	K	Na	Ca	Mg	P
	%	%	%	%	(ms)		(m^2⋅g^−1)	(g⋅kg^−1)	(g⋅kg^−1)	(g⋅kg^−1)	(g⋅kg^−1)	(g⋅kg^−1)
RS		15.43	7.57	68.58	N.A.	N.A.	N.A.	17.60	0.28	8.34	1.81	0.88
RS-400	47.45	31.87	21.88	38.05	4.70	9.81	270.84	28.31	0.49	11.70	4.31	2.50
RS-500	39.25	35.01	33.30	24.73	5.32	10.89	314.86	38.80	0.69	11.37	5.82	3.22
RS-600	36.35	41.09	33.33	19.16	5.73	11.1	465.21	40.39	0.61	40.51	5.39	3.29
RS-700	36.00	42.16	34.65	17.20	5.77	11.18	404.97	40.69	0.71	11.33	4.90	3.06
DRS	N.A.	43.77	4.48	46.78	N.A.	N.A.	N.A.	5.01	1.21	40.47	5.54	13.74
DRS-400	74.85	57.36	8.07	31.13	0.57	8.6	117.42	6.75	1.62	51.82	7.34	20.19
DRS-500	63.16	64.18	13.95	18.04	0.74	9.12	137.50	6.50	1.57	52.07	7.66	21.03
DRS-600	59.70	69.01	12.46	14.97	0.69	9.52	162.00	8.62	2.04	256.91	9.61	25.38
DRS-700	57.52	70.82	14.76	11.04	0.79	9.73	213.27	8.60	2.12	174.85	8.96	25.61

Note. means not applicable; is fixed carbon; is volatile matter.