Modified Saw Dust for the Removal of Lead Cations from Aqueous Media

Abstract

Saw dust modified with chloroethylacetate was prepared. The product was used as an extracting agent for the solid-phase extraction of lead cations from aqueous media. The uptake performance of modified saw dust (MSD) for removal of Pb(II) cations was investigated using batch method. The influences of some experimental parameters like initial concentration of the cation, extraction time, concentration of the saw dust, pH and temperature were studied. Three adsorption isotherms [Langmuir, Freundlich and Dubinin-Redushkevish (D-R)] were used to analyze the equilibrium data. The sorption capacity of modified saw dust was found to be 78.1 mg/g at 298 K from 164 mg/l aqueous solution of lead cation. The mean free energy calculated from D-R model was found to be 15.81 KJ/mol, indicating that chemisorption is involved in the extraction process. The removal of lead cation does not change with increasing temperature. The present method has been compared with the previous methods.

Application of calixpyrrole modified silica for the removal of 4-chlorophenol from aqueous media

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Kinetics and thermodynamics of chromate and phosphate uptake by polypyrrole: batch and column studies

“…Among these are fly ash [17], blast furnace slag [18], iron oxide tailing [19], red mud [20], Ca-based adsorbents, and iron-based compounds [21]. Since the last decade, polymers [22][23][24] and macrocyclic derivatives of pyrrole [14] have attracted more attention as adsorbents of anionic and cationic pollutants from water because of their nontoxicity, good environmental stability, low cost and ease of preparation [25][26][27]. In this context, polypyrrole-coated sawdust [28] and Fe 3 O 4 coated polypyrrole magnetic nanocomposite [22] were used to remove phosphate and chromium (VI) ions from water respectively.…”