Analytical grade reagents are used in all experiments. Basic
dye, CR (99%) is purchased from Merck Company, the chemical
structure and properties of CR are listed in Fig. 1 and Table 2.
Activated carbon was prepared by a conventional method i.e.
carbonization and chemical activation with phosphoric acid.
Apricot stones, obtained from Boumerdes region (50 km east
Algiers), are air-dried, crushed and screened to obtain two
fractions with geometrical mean sizes of 63 and 2.5mm. 100 g
of the selected fraction are impregnated with concentrated
H3PO4 (85%), dried in air and activated in a muffle furnace at
Analytical grade reagents are used in all experiments. Basicdye, CR (99%) is purchased from Merck Company, the chemicalstructure and properties of CR are listed in Fig. 1 and Table 2.Activated carbon was prepared by a conventional method i.e.carbonization and chemical activation with phosphoric acid.Apricot stones, obtained from Boumerdes region (50 km eastAlgiers), are air-dried, crushed and screened to obtain twofractions with geometrical mean sizes of 63 and 2.5mm. 100 gof the selected fraction are impregnated with concentratedH3PO4 (85%), dried in air and activated in a muffle furnace at
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