Investigation of Kinetic, Isotherm and Studying Adsorption Efficiency of Cd(II), Zn(II) by Low-Cost Activated Carbon

The goal of this investigation effort was to organize activated carbon from olive stone through by 0.01 M D₂EHPA. The adsorption ability of carbon with cadmium and zinc existed also studied. Focuses of metals were examined through using flame atomic absorption spectrophotometry. The factors that disturb the adsorption, such as contact time, acid concentration, solid liquid ratio, RPM, and temperature, have been considered and enhanced conditions were determined. The results showed that the maximum adsorption capacities of carbon were found to Cd²⁺ and Zn²⁺with 28.0 and 22.17 mg/g, respectively. The Langmuir adsorption model might be used to clarify the adsorption isotherm with the pseudo-second order and The Cd²⁺ and Zn²⁺sorption process onto the olive stone (OS) occurred spontaneously (­–ΔG), in an exothermic nature (–ΔH), and with increased non randomness (–ΔS).