Removal of Pb+2 Ions from Aqueous Solutions by Adsorption on Kaolinite Clay

Abstract

Abstract:The adsorption potential of the kaolinite clay for the removal of lead ions from aqueous solutions was tested. The measured adsorption isotherms at the different temperatures 298.15 K, 308.15 K and 318.15 K were found to be perfectly fit to the Langmuir isotherm equation. A high adsorption capacity was calculated. An increase in the retention capacity with increasing temperature was measured. The adsorption process was found to be endothermic with an estimated mean enthalpy change of 135.2 kJ/mol. The measured adsorption kinetic data at different temperatures proved that not only intraparticle diffusion controls the adsorption process but also surface adsorption contributes to the control of rate of adsorption. The influence of pH in the acidic range was investigated. The measured increase in the adsorption rate at higher pH values (4.9) was explained through the influence of H + ions on the complex ion formation.

Kinetics, thermodynamics and competitive adsorption of lead and zinc ions onto termite mound

“…The negative value of DG for Pb(II) at 313 up to 333 K indicates spontaneity of the adsorption of Pb(II) in single adsorbate system and negative at 323 and 333 K in binary system onto TM. Although adsorption of Zn(II) is not spontaneous, it can be improved upon by increasing the temperature of the adsorption process since positive DG value for Zn(II) decreases with increase in temperature (Omar and Al-Itawi 2007). The DG value was more positive in binary Zn(Pb/Zn) solution than in the single Zn(II) system.…”

“…The volume of available literature on biomass compared to other natural materials shows that there is greater attention on adsorbents prepared from biomass, while less attention is given to other natural materials. Some agricultural by-products that have been used as adsorbents are rubber wood sawdust (Srinivasakannan and Abu Baker 2004), dates stone (Alhamed and Bamufleh 2009), bamboo-based [Hameed et al 2007], coconut shell [Torregrosa-Macia et al 1997;Tan et al 2008], clay and clay materials (Appel and Ma 2002;Rouff et al 2005;Omar and Al-Itawi 2007) and oxides of iron (Abdus-Salam and Adekola 2006). Activated carbon (AC) is the most widely used adsorbent for wastewater treatment.…”

Optimization of zeolite-based adsorbent composition for fabricating reliable Raschig ring shaped by extrusion using Weibull statistical theory

“…Omar and Al-Itawi used the kaolinitic clay as low cost and potential adsorbent for the removal of lead ions from wastewaters and industrial solutions [5]. The results indicate that kaolinite clay can efficiently remove lead ions from solutions.…”

Adsorptive removal of naphthalene and anthracene from aqueous solution with zinc and copper-terephthalate metal-organic frameworks

“…Various methods and approach have been utilized in the removal of pollutants like polycyclic aromatic hydrocarbons, PAHs (fluorene, anthracene, naphthalene, etc.) and heavy metals from aqueous solutions [1][2][3][4]. These include solvent extraction, ion exchange filtration and membrane separation, reverse osmosis, chemical precipitation and coagulation.…”