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. 2019 Aug 17;5(8):e02324. doi: 10.1016/j.heliyon.2019.e02324

Table 2.

Chemical composition, BET surface area, and micropore volume of calcined cogon grass.

Composition (% wt.) Calcined at 600 °C
 Calcined at 700 °C
2 h 4 h 2 h 4 h
SiO2 97.30 97.70 97.70 97.50
P2O5 0.91 0.90 0.70 0.72
CaO 0.43 0.36 0.47 0.53
Fe2O3 0.33 0.25 0.23 0.26
SO3 0.23 0.14 0.17 0.26
Al2O3 0.23 0.19 0.13 0.19
ZnO 0.20 0.16 0.27 0.15
MgO 0.14 0.12 0.14 0.15
K2O 0.16 0.14 0.10 0.14
Others 0.07 0.04 0.09 0.10
BET surface area (m2g−1) 130 108 172 90
Total pore volume (cm3g−1) 0.37 0.31 0.45 0.34