Heavy metal pollution has a harmful impact on human health and is regarded as a vital problem. Preparation of a novel, low cost bio-sorbent for heavy metal sorption is the main target of this research. Non-living Chlorella Vulgaris Alga/Date pit activated carbon composite (1:1), (CV/AC), is a novel bio-sorbent prepared by the wet-chemical method for sorption of Pb (II) and Sr (II) from aqueous media. The optimum pH for sorption reaction is 5 and the equilibrium time is achieved within 1 h. The sorption efficiencies are 90.5% for Pb(II) and 95.7% for Sr(II) with initial concentration Co 10 mg L– 1 at 298 K. The monolayer sorption capacities of CV/AC composite at 298 K and pH = 5 were 6.34 ± 0.059, 5.97 ± 0.22 mg g– 1. The saturation capacities were 98.5 and 125 mg g– 1 for Pb (II) and Sr (II), respectively after 10 days. The sorption process is a spontaneous and endothermic reaction. It follows a pseudo-2nd-order mechanism. The results are suggestive of the need to adopt CV/AC composite as a potential bio-sorbent of Pb (II) and Sr (II) for waste water treatment.

    Abstract
    1 Introduction
    2 Experimental
        2.1 Chemicals
        2.2 Preparation of activated carbon
        2.3 Preparation of non-living Chlorella Vulgaris algadate pit activated carbon composite (CVAC)
        2.4 Instruments
        2.5 Sorption studies
        2.6 Determination of saturation capacity
        2.7 Kinetics and isotherm modelling
    3 Results
        3.1 Materials characterization
        3.2 Sorption study
        3.3 Kinetic modeling
        3.4 Adsorption isotherm modeling
        3.5 Comparison with other adsorbents
    4 Conclusions
    Acknowledgements 
    References

• G. A. Dakroury(Nuclear Chemistry Department, Hot Laboratories Centre)
• E. A. A. El‑Shazly(Nuclear Chemistry Department, Hot Laboratories Centre)
• H. S. Hassan(Waste Management Department, Hot Laboratories Centre)