Abstract
This work reports the application of Posidonia oceanica for the elimination of heavy metals M(II) (M = Zn, Cd, Ni, Cu and Pb) by biosorption in batch system. The effect of the contact time, initial M concentration, pH and temperature was considered. The kinetic and equilibrium models for the M-biosorption were tested namely the pseudo-first-order, pseudo-second-order and Elovich kinetic models. Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherms models have also been used to fit equilibrium adsorption data. The adsorption kinetics follow a pseudo-second-order model for all studied systems, and the equilibrium data are suitably fitted by the above models. The amount of adsorbed metals by biosorption is 48.33, 43.9, 41.02, 37.90 and 30.22 mg/g for Pb(II), Cu(II), Ni(II), Zn(II) and Cd(II), respectively. The thermodynamic parameters suggested that the metal biosorption is spontaneous with an endothermic nature.
Highlights
The environmental pollution by heavy metals is a serious threat and a complex problem that has been and is still a focus of attention throughout the world since they are nonbiodegradable and exist in all the food chain
Cadmium is employed in batteries, paints and plastics
1 Department of Physical Chemistry, Faculty of Chemistry, University of Science and Technology, Algiers, Algeria (Low et al 2000), whereas zinc is used in acid galvanizing plants (Tunali and Akar 2006)
Summary
The environmental pollution by heavy metals is a serious threat and a complex problem that has been and is still a focus of attention throughout the world since they are nonbiodegradable and exist in all the food chain. The metals are among the major pollutants in surface and underground waters, and both industrial and municipal wastewaters contain metal ions which are hazardous to the human health (Krishnani et al 2008; Gupta et al 2013). The industry uses nickel in various products (detergents, metal-based jewelry, steel and many other metal products) (Venkateswarlu et al 2015). All these metals are not biodegradable and have negative effects on the flora and fauna (Rozaini et al 2010). They cause chronic bronchitis and reduced lung function (cancer of the lungs) (Ahmaruzzaman and Gupta 2011)
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