Enhanced adsorptive removal of cationic and anionic dyes from aqueous solutions by olive stone activated carbon

In this work, four activated carbons were synthetized from natural olive stone (NOS) wastes using ZnCl2 as an activating agent. These (OSAC) for a constant mass ratio of ZnCl2: NOS 2:1, contact time 2 h and different heating temperatures (300, 400, 450 500 °C). The physicochemical characterization these by various analyses including N2 adsorption–desorption measurements, surface charge evolution versus pH, Boehm titration, Fourier transform (FTIR) scanning electron microscopy (SEM) showed that the carbon produced at temperature 400 °C (OSAC °C) exhibited best properties. Indeed, it has highest BET area, total pore micropore volumes with values 740 m2·g -1 , 0.57 cm3·g 0.25 respectively. Moreover, is rich in acidic basic functional groups could react common adsorbents.