Abstract
Because of the excellent reducing capacity of nanoscale zero-valent iron (NZVI), it can be used as alternative materials for the removal of a variety of reducible water contaminants including toxic metals. The current paper reports the research results obtained for self-prepared biosorbent, Posidonia oceanica biomass, activated in alkaline medium and functionalized with NZVI particles. The structural characteristics, surface morphology, and binding properties of the resulting nanobiosorbent are presented. Batch comparative adsorption trials including adsorption kinetics and isothermals onto raw Posidonia, Posidonia–OH and Posidonia–OH–NZVI were investigated on three heavy metal ions: Cd(II), Pb(II), and Cu(II). The nanobiosorbent showed better properties, such as high reactivity and high uptake rate through the sorption process. The toxic metal removal has been monitored in terms of pseudo-first- and pseudo-second-order kinetics, and both Langmuir- and Freundlich-type isotherm models have been used to describe the sorption mechanism. The experimental data of all studied systems showed that the uptake kinetics follow the pseudo-second-order kinetic model and the equilibrium uptake can adopt the Langmuir-type isotherm model which assumes a monolayer coverage as the adsorption saturates and no further adsorption occurs. The thermodynamic results confirm that all sorption processes were feasible, spontaneous and thermodynamically favorable. Zeta potential data displayed that Cd(II), Pb(II), and Cu(II) tend to be reduced after exposure on the Posidonia–OH–NZVI surface. Furthermore, sorption competitions of the metals from binary and ternary systems were carried out onto Posidonia–OH–NZVI in order to gain further insight into the sorption efficiency of this material. Therefore, as a result, the proposed new nanobiosorbent could offer potential benefits in remediation of heavy metal-contaminated water as a green and environmentally friendly bionanocomposite.
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We would like to express our sincere appreciation to all those who constructively engaged in the realization of this work. Particularly, we would like to acknowledge graciously the valuable assistance of Aisha Gharsalli from the “University of South Florida, Department of Biomedical Sciences, Tampa, FL, 33620, USA.”
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Boubakri, S., Djebbi, M.A., Bouaziz, Z. et al. Nanoscale zero-valent iron functionalized Posidonia oceanica marine biomass for heavy metal removal from water. Environ Sci Pollut Res 24, 27879–27896 (2017). https://doi.org/10.1007/s11356-017-0247-0
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DOI: https://doi.org/10.1007/s11356-017-0247-0