Removal of Cadmium(II) and Lead(II) ions from aqueous phase on sodic bentonite

Abstract

This paper describes the adsorption of Cd 2+ and Pb 2+ ions using sodic bentonite clay type Fluidgel modified. The Fluidgel before and after chemical modification and thermal activation was characterized by different techniques including X-ray diffraction, thermal analysis, Fourier transform infrared, surface area, helium pycnometry, cation exchange capacity and scanning electron microscopy. Pseudo-first order, pseudo-second order and intra-particle diffusion models were used to analyze the kinetic curves. Equilibrium data were analyzed using Langmuir and Freundlich models. The thermodynamic study indicated that lead adsorption process is endothermic and interactions between clays and solutions of lead occurred spontaneously, while cadmium adsorption revealed an exothermic and spontaneous nature. The maximum removal efficiencies were 97.62% for Cd(II) using Fluidgel modified chemically and 91.08% for lead by Fluidgel modified chemical and thermally.

Adsorption of lead and copper ions from aqueous effluents on rice husk ash in a dynamic system

“…Ion exchange can be an additional process for removal of copper and lead by RHA, being verified by the results of chemical composition presented in Table 8, where the percentage of exchangeable potassium in the RHA drastically decreased after adsorption. The mechanism of ion exchange can be written as follows: Similar results were obtained by Galindo et al (2013) in a study of the removal of cadmium and lead using sodic clay. The authors reported that ion exchange can be an additional process for removal of cadmium and lead on sodic clay and that the amount of exchangeable cations Na + was reduced after metal adsorption.…”

“…Some of the important ones include zeolites (Wang and Peng, 2009;Okolo et al, 2000), activated carbon (Wahby et al, 2011;Moreno-Piraján et al, 2011;Attia et al, 2010;Giraldo and Moreno-Piraján, 2008), rubber ash (Mousavi et al, 2010), clay (Galindo et al, 2013;Almeida Neto et al, 2012;Vieira et al, 2010a;Vieira et al, 2010b), expanded perlite (Torab-Mostaedi et al, 2010), vermiculite (Nishikawa et al, 2012), algae (Vieira et al, 2008;Vijayaranghavan et al, 2005;Silva et al, 2003), bacteria (Yilmaz et al, 2010), coir pith (Parab et al, 2006), sugarcane bagasse (Lv et al, 2008;Gupta and Ali, 2004), olive stone (Calero et al, 2009) and rice husks Vieira et al, 2011;Senthil Kumar et al, 2010;Naiya et al, 2009;Srivastava et al, 2006;Ye et al, 2010;Nakbanpote et al, 2007;.…”

Removal of cobalt(II) from aqueous solution by local Saudi bentonite: Kinetic and equilibrium investigations

“…Equilibrium for the adsorption of cobalt ions onto the bentonite was attained after 60 minutes with initial concentrations of 240 mg l -1 at 60 °C. Thus an equilibrium was attained is shorter time interval in comparison to the equilibrium time of 150 [32] and 120 minutes [33] reported for cadmium removal.…”

Fixed Bed Biosorption Using Aquatic Macrophyte in Lead Removal

“…Low-cost materials such as agricultural waste, chitosan, clays, seaweed, macrophytes, industrial waste processing have been used to evaluate the removal of heavy metal ions from wastewater (Lee and Davis, 2001;Hassanein and Koumanova, 2010;Ngah et al, 2002;Galindo et al, 2013;Almeida Neto et al, 2012;Matos et al, 2009;Lima et al, 2013). Among these materials, macrophytes have shown good affinity with metal ions, and are renewable in nature (Banerjee and Sarker, 1997;Saygideger et al, 2005;Phetsombat et al, 2006;Rahman et al, 2008;Khellaf e Zerdaoui, 2010).…”