3.3.2
Results & discussion
Results from the experiments are listed in the Table 3-1 below. According to the results, highest specific surface area, pore volume, total pore volume, total carbon content and yield was obtained by chemically activating biochar with ZnCl2. On the other hand, pores created with ZnCl2 were mostly in microporous region. Mesoporous structure can be obtained from biochar using KOH as an activation agent. Lowest yield was obtained during the physical activation of biochar with steam. Table 3-1. Overall results from the biochar activation.
Specific surface area
Pore volume
Total pore volume
Micro (< 2 nm)
Meso (2-50 nm)
Macro (50 > nm)
Yield
Total carbon content
(m2/g)
(cm3/g)
(cm3/g)
(%)
(%)
(%)
(%)
(%)
Biochar_800 oC_2 h steam activation
811
0,46
0,17
16,3
36,4
47,2
33,5
86,91
Biochar with ZnCl2_500 oC_2 h activation AW
1660
0,78
1,19
75,6
21,0
3,4
48,2
87,81
Biochar with KOH_500 oC_2 h activation AW
489
0,31
0,17
17,6
70,6
11,8
41,8
75,45
Biochar blank
14
0,02
0,067
1
30
69
-
65,57
Sample
23
