Synthesis of Nanoporous Biochar from Rice Husk for Adsorption of Methylene Blue

Table 2

Comparison of adsorption capacity of other work in the literature with KN-AC.

Absorbent	Activating agents	Pyrolysis temperature (°C)	Surface area (m^2·g^−1)	Qmax (mg·g^−1)	Process parameters		References
					Adsorbent dose (g·L^−1)	pH
Rice husk	KOH and NaOH	800	1196	359.7	0.4	8	This work
Corn cob	KOH	700	492	333	0.8	—	[42]
Soybean straw	KOH	550	1906	1626.4	0.3	11	[43]
Acacia wood	KOH	550	1045	338.29	1	10	[44]
Sweet potato vine	ZnCl2	500	1397	299.2	1	12	[45]
Prosopis juliflora stem	ZnCl2	800	252	—	3.4	—	[46]
Banana stem	H3PO4	400	837	101.01	1	7	[47]
Waste pepper (isot) stems	H3PO4	650	1003	92.6	1	8	[48]
Sugarcane	Natural zeolite	500	—	51	0.1	7	[49]
Industrial lignin	FeCl3⋅6H2O	800	885	200	0.3–2.0	4	[50]
Hickory chip	H2O2	450	143.3	310	0.4	—	[51]
Watermelon rind	H2SO4	110	0.357	200	0.8	9	[52]
Kelp	—	1000	771	379.8	1	—	[53]