Using of Sukkari and Khalas Date Pits as a Bio-adsorbents for Adsorption of Lead and Copper Ions from Waste Water

In this study date pits of two types of date-palm trees (Phoenix Dactylifera L.), in Saudi Arabia were used as bio-sorbents for heavy metals (e.g. lead and copper) from aqueous solutions. Investigation of equilibrium time and the effect of different concentrations of metals were performed. Adsorption capacity of bio-sorbents increases with increasing concentration of metal ions. Maximum adsorption capacity at room temperature of Sukkari date pits was 17.53 mg g(-1) and 9.86 mg g(-1) for lead and copper ions, respectively. Whereas, Khalas date pits showed maximum adsorption capacity at 14.1 mg g(-1) and 7.91 mg g(-1) for lead and copper ions, respectively at room temperature. Equilibrium isotherm models, (Langmuir and Freundlich models), were used for analysis of equilibrium experimental results. these models describe the experimental data well.