چكيده به لاتين
Providing acceptable and cost-effective environmental biomaterials that can
remove the oily phase from the water is necessary. The aim of the present study
was to prepare pumice and peat moss as an oil adsorbent and performance
evaluation of these two mineral and natural materials in oil/water separation. By applying one factor at a time method, the effect of the modifier type (octadecyl
trichlorosilane, trimethylchlorosilane, stearic acid, and palmitic acid) and the modifier concentration (within a specific range) were evaluated for both
mentioned materials. The optimum water contact angles of pumice and peat moss
were obtained 159.2°±0.82° and 160.4°±1.62°
, respectively. The optimum contact
angles hysteresis of pumice and peat moss were obtained 2.38°±0.08° and
3.47°±0.28° , respectively. Instrumental characterizations were performed to determine the properties of the adsorbents. Also, the presence of modifiers on
the surface of the pumice and peat moss was confirmed. The oil adsorption capacity was obtained 0/45 and 1.8 g/g for the pumice and peat moss optimum
samples during batch oil spills at the water surface, respectively. On the other hand, the removal efficiency and flow rate of dichloromethane from water using pumice and peat moss were 98.3 and 96.7% and 8422.38 and 10828.78 Lm-2h-1, respectively. Also, separation efficiency experimental in ten cycles were performed for both materials, and the separation efficiency was still above 92%
after ten cycles of oil/water separation. On the other hand, with increasing separation cycles, the flux decreased to 3445.52 and 5338.13 Lm-2h-1 for pumice and peat moss, respectively. The variation of water contact angle values vs. water immersion time was evaluated to examine the particles' durability. After 6 h,
WCA decreased from 159.2° to 153.3°
and 160.4° to 153.9°
for pumice and peat
moss, respectively. The optimum samples showed that superhydrophobicity
properties (WCA > 150°
) have remained in water immersion for 6 h.
