Table 1 CHN elemental analysis, pHsolution, pore size and surface area characterization, bulk density, and particle density for the olive stones.

From: Mechanistic understanding of the adsorption and thermodynamic aspects of cationic methylene blue dye onto cellulosic olive stones biomass from wastewater

Adsorbent

CHN elemental analysis

C%

H%

N%

Green olive stones

47.56

6.19

0.39

Black olive stones

48.12

6.37

0.55

 

pHsolution (Experimental conditions: mass of adsorbent: 0.03 g, solution volume: 30 mL distilled water, temperature: 25 °C, and contact time: 24 h)

Before adsorption

After adsorption

∆pH

Green olive stones

5.82

5.62

0.19

Black olive stones

6.31

6.34

− 0.03

 

Bulk density (g/cm3) (Experimental conditions: mass of adsorbent: 2 g, particle size: 0.5–0.250 mm, volume: 10 mL, and temperature: 25 °C)

Particle density (g/cm3) (Experimental conditions: mass of adsorbent: 2 g, particle size: 0.50–0.250 mm, volume: 4 mL, and temperature: 25 °C)

Green olive stones

2

3

Black olive stones

2.2

3.2

 

Pore size and surface area characterization

Volume of the macropores (cm3/g)

Volume of the mesopores (cm3/g)

Specific surface area (SBET) (m2/g)

Green olive stones

0.189 ± 0.009

0.0430 ± 0.0008

1.21 ± 0.04

Black olive stones

0.171 ± 0.009

0.0355 ± 0.0011

1.03 ± 0.06

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