Table 2
Description and physical characteristics of tested sorbent materials.
| Sorbent type | Code | Description and physical characteristics |
|---|---|---|
| Natural bleaching earth | NBE | Steam activated bleaching earth, characterized by fast filtration capacity and good bleaching power. Surface area (BET): 180±20 m2/g; pH: 7.0±1.0; granulometry: 25-150 μm; moisture content: <30% (measured humidity*: 7.69±0.11) |
| Acid activated bleaching earth/activated carbon (5%) | AABE/AC | Highly active bleaching earth manufactured by acid activation of calcium bentonite, containing 5% of AC with a highly porous inner structure, suitable for the removal of both polar and non-polar components as PAHs. Surface area (BET): 187 m2/g; pH: 3.5; granulometry: 25-150 μm. Free moisture (2h, 110 °C): 11%. |
| Activated carbon | AC | Powdered activated carbon produced from specially selected grades of bituminous coal. Surface area (BET): 1100±1200 m2/g; pH in water solution: 8.0; granulometry: 75-200 μm. Moisture content: <5% (measured humidity*: 2.85±0.08). |
| Amorphous silica powder | AmSi | Filtration aid used to treat oils/fats that have undergone interesterification or hydrogenation treatments in order to facilitate filtration and remove catalyst residue (0.1% of the oil weight). Surface area: 680 m2/g; pH in 10% water solution: 3.0; particle size d50: 17-23 μm. (Measured humidity*: 54.73±0.09) |
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