Evaluation of kinetics and adsorption isotherms for the Elimination of Pb(II) from aqueous solutions using Aloe barbadensis Miller Leaf Powder
Journal: Pollution (Vol.1, No. 4)Publication Date: 2015-08-01
Authors : R Malik; Suman Lata; Sushila Singhal;
Page : 403-415
Keywords : Adsorption; Aloe barbadensis miller; aqueous solutions; Heavy metals;
Abstract
An adsorbent was developed from matured leaves of the Aloe barbadensis miller plant for removing Pb(II) from aqueous solutions. Adsorption was carried out in a batch process with several different concentrations of Pb(II) by varying amount of adsorbent, pH, agitation time and temperature. The uptake of the metal was initially very fast, but gradually slowed down indicating penetration into the interior of the adsorbent particles. The experimental data closely followed both Langmuir and Freundlich isotherms. A small amount of the adsorbent (1 g/50ml) could remove as much as 86% of Pb(II) in 35 min from a solution of concentration 0.3 mg/50ml at 25°C. The adsorption continuously increased in the pH range of 2.0?5.0, beyond which the adsorption could decrease up to pH 7.0 when the adsorption could not be carried out due to precipitation of the metal. The adsorption was exothermic at ambient temperature and computation of the parameters, ΔH, ΔS and ΔG, which indicated the interactions to be thermodynamically favorable.
Other Latest Articles
- Environmental policy and management of freshwater resources in the Haraz-Ghareh Su Basin in comparison to other Caspian sub basins
- Potential of Lemna minor in Ni and Cr removal from aqueous solution
- Assessment and control of VOCs emitted from gas stations in Tehran, Iran
- Residual archives on organochlorine insecticides in the core sediment of a tropical estuary, India
- Various Parsers Available for Indian and Foreign Languages: A Survey
Last modified: 2016-07-02 01:33:00