Table 1.

The structural parameter of different biochars.

Sample name	Pore volume (cc/g)	Pore diameter (nm)	Surface area (m2/g)	References
Rapeseed stem biochar	0.1052	2.20	316.90	Zhao, et al.43
Maize straw biochar	0.06		70.00	Wang, et al.44
Castor oil cake biochar	0.00314	6.9115	1.82	Kalinke, et al.45
Pinecone biochar	0.17	3.078	289.69	Present study