Characterization and Analysis of Argania spinosa Shells from Souss-Massa Area: Application in the Adsorption of Methylene Blue in Aqueous Solution

Table 5

Zeta potential over time (raw Argan shells and 1 mM KCl solution).

Time in hours	Zeta potential
0	-24.61
0.5	-20.52
1	-20.68
1.5	-21.16
2	-21.35
18	-22.75