Review Article
An Overview of Current and Prognostic Trends on Synthesis, Characterization, and Applications of Biobased Silica
Table 2
Composition of rice husk and rice straw ash by geographical location.
| Chemical components | Composition in percent | References | [75] | [9] | [76] | [77] | [78] | [79] | [59] | [76] | China | Indonesia | India | Cambodia | Italy | Vietnam | Egypt | Bangladesh | Brazil | Canada | Malaysia | India | Rice straw | Rice husk | Rice straw | Rice husk | Rice husk | Rice straw | Rice straw | Rice straw | Rice husk | Rice husk |
| Silicon dioxide (SiO2) | 73.26 | 94.79 | 84.60 | 80 | 80.18 | 83.20 | 50.68 | 57.90 | 89.86 | 92.9 | 97 | 93.1 | 22.12 | Aluminium oxide (Al2O3) | 0.25 | 0.36 | — | 3.93 | 0.83 | 0.33 | 0.14 | 1.00 | 0.73 | 0.18 | 0.4 | 0.21 | 1.23 | Ferric oxide (Fe2O3) | 0.49 | 0.86 | 0.16 | 0.41 | 4.29 | 3.57 | 0.43 | 1.00 | 1.28 | 0.43 | 0.4 | 0.21 | 1.28 | Calcium oxide | 4.46 | 0.75 | 0.88 | 3.84 | 1.55 | 1.60 | 6.14 | 2.30 | 0.91 | 1.03 | 0.49 | 0.41 | 1.24 | Magnesium oxide (MgO) | 2.14 | 1.86 | 0.44 | 0.25 | 0.81 | 1.00 | 2.32 | 3.40 | 1.16 | 0.35 | 0.50 | 1.59 | 0.21 | Sodium oxide (Na2O) | 0.93 | 0.39 | — | 0.67 | — | — | — | — | — | 0.02 | 1.12 | — | — | Potassium oxide (K2O) | 13.46 | 1.86 | 6.39 | 1.45 | 3.89 | 2.73 | 21.11 | 14.60 | — | 0.72 | 3.0 | 2.31 | — | Manganese oxide (MnO2) | 0.04 | 0.02 | — | — | — | — | — | — | — | — | — | — | 0.074 | Phosphorus oxide (P2O5) | 1.94 | 0.23 | — | 3.80 | 3.80 | 4.12 | 0.77 | 13.80 | — | — | — | — | — | Sulfur trioxide (SO3) | 2.41 | 0.09 | — | 0.78 | 2.05 | 1.52 | 2.14 | 3.20 | — | 0.10 | 0.24 | — | — | Titanium oxide (TiO2) | 0.05 | 0.02 | — | — | — | — | — | — | — | — | — | — | — | Chlorine (Cl2) | 0.57 | 0.08 | — | — | — | — | — | 2.30 | — | — | — | — | — | Other components | — | — | 7.53 | 2.60 | 2.60 | 1.92 | — | 0.50 | — | — | — | — | — | Loss on ignition [80] | — | — | — | 8.56 | — | — | — | — | 4.26 | — | — | — | 73.87 |
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