Молекулярная биология: открытый доступ

Activated Carbon-Based Date Palm Leaves (Phoenix dactylifera L.), Prepared by Chemical Activations: TGA and DTGA Analyses, Young's Modulus, Porosity and Electrical Conductivity

Abstract

Fatima Musbah Abbas1*, Zehbah Ali Al Ahmad2, Rehab Omer Elnour Elgezouly3 and Abubaker Elsheikh Abdelrahman4

Activated carbon pellets (ACPs), precursor (palm leaves) (Phoenix dactylifera L.), are primarily heated at low temperatures and milled into a fine grain powder to produce self-adhesive properties. The grain powders produced were impregnated in KOH solutions having a concentration of 0–0.35 moles (M) and pelletized by applying 12 metric tons of pressure, before being carbonized at 700°C, in a nitrogen environment. The thermal gravimetric analysis (TGA) and differential thermal gravimetric analysis (DTGA) were carried out on the pre-carbonized date palm leaves. The results showed that with increasing KOH concentration, the weight loss of the sample markedly decreased. The young modulus (E) showed that 0.25 M has a higher value of 10.6 GPs than the others, indicating better grain particle alignment. The porosity (B) of the AC was estimated empirically by adjusting the values of B to have a straight line with a slope of ≈ 2. The results found that the porosities of the AC fluctuated in a range of 0.39–48 with the KOH concentration. The electrical conductivity (σ) of the AC showed that 0.2 M was a higher value than the others, indicating that more mobility carried in the sample. The percolation theory was found to have a good correlation with the bulk density of the carbon samples, and this was interpreted by the increase in the bulk density of the AC sample above the critical density of 0.45 g/cm³ for the E and above the critical density of 0.045 g/cm³.