Removal of cadmium and nickel from aqueous solution using expanded perlite

Abstract

-The adsorption characteristics of cadmium and nickel onto expanded perlite from aqueous solution have been investigated with respect to changes in pH of solution, adsorbent dosage, contact time and temperature of the solution. The maximum removal efficiency of Cd (II) is 88.8% at pH 6 and exposure to 10 g/L expanded perlite, while for Ni (II), it is 93.3% at the same pH and exposure to 8 g/L adsorbent. For the adsorption of both metals, the Freundlich isotherm model fitted the equilibrium data better than the Langmuir isotherm model. Experimental data are also evaluated in terms of kinetic characteristics of adsorption and it was found that the adsorption process for both metal ions follows well pseudo-second-order kinetics. Thermodynamic functions, the change of free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) of adsorption are also calculated for each metal ion. The results show that the adsorption of these metal ions on expanded perlite is feasible and exothermic at 20-50°C.

Determination of the maximum retention of cobalt by ion exchange in h-zeolites

“…Several authors have used adsorption models to describe experimental data for ion exchange in zeolites and other materials (Misak, 1995;Malekian et al, 2010;Ostroski et al, 2009;Al-Anber and Al-Anber, 2008, Silva et al, 2003, Torab-Mostaedi et al, 2010, Senthil Kumar et al, 2010. In applying such models, one should bear in mind that the ion exchange process is the most important sorption mechanism although the subsequent adsorption phenomena should not be neglected.…”

Kinetic modelling of cadmium and lead removal by aquatic mosses

“…Various low cost adsorbents have been investigated for removing Cd, Pb and other metals from aqueous solutions: bentonite (Naseem and Tahir, 2001), expanded perlite (Torab-Mostaedi et al, 2010), mud (Salim, 1986), volcanic ash soil (Cajuste et al, 1996), pine bark (Al-Asheh et al, 1998), waste tire rubber ash (Mousavi et al, 2010), freshwater macrophytes (Schneider and Rubio, 1999), bacteria (Yilmaz et al, 2010), aquatic mosses (Al-Asheh et al, 1998;Martins and Boaventura, 2002), peat moss (McKay and Porter, 1997), alum sludge (Chu, 1999), soybean hulls, cottonseed hulls, rice straw and sugarcane bagasse (Marshall and Champagne, 1995), rice husk (Vieira et al, 2012;Senthil Kumar et al, 2010), olive stones (Calero et al, 2009), activated carbon from lignocellulosic residues (Giraldo and MorenoPiraján, 2008;Attia et al, 2010). The literature shows an extensive list of biomass used in metal biosorption; the novelty of this work is exactly the use of an aquatic moss, a less studied material.…”

Insight of the removal of nickel and copper ions in fixed bed through acid activation and treatment with sodium of clay

“…The application of various alternative materials for sorption or elimination of metals in wastewater has been investigated due to its numerous economic advantages Zola et al, 2012;Oueslati et al, 2011;Torab-Mostaedi et al, 2010;Attia et al, 2010;Yilmaz et al, 2010;Giraldo and Moreno-Piraján, 2008;Novakovic et al, 2008;Stathi et al, 2007;Ouhadi et al, 2006). The cost of clay is relatively low compared to other alternative adsorbents, including activated charcoal, natural and synthetic zeolites, and ion exchange resins.…”