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

Table 4

Evolution of pH for different KCl solutions (100 mL) in contact with Argan shells (mass 0.1 g).

Time (h)	Solution 1	Solution 2	Solution 3	Solution 4	Solution 5
0	1.78	4.17	7.96	9.81	11.43
1	1.50	3.45	6.10	7.92	9.33
2	1.46	2.98	5.34	6.14	7.93
3	1.41	2.10	4.97	5.27	6.34
4	1.36	1.99	4.57	5.01	6.15
5	1.35	1.88	4.39	4.81	6.08
48	1.25	1.77	4.12	4.71	5.97