Use of modified silica gel for concentrating Pb (II) and Cd (II) occurring in form of complex anions

Abstract

The performance of silica gel, modified by the impregnation with a high molecular weight quaternary amine (triethyl octadecyl ammonium iodide), used for the concentration of heavy metals occurring in water is studied. The material under study captures Cd, Pb, which are capable of forming stable complexes with Iions.The results obtained about the metal capture, under dynamic conditions, are described and metal ions are removed by desorption with EDTA and quantified by AAS.

Syntheses, characterization, and adsorption properties for metal ions of silica-gel functionalized by poly[8-methacroyloxy-quinoline]

“…All the obtained isotherms (Figs. [10][11][12][13][14] belong to the 2L species, which indicates the uniform location of the sorbed metal ions on the surface of the composite. This type of isotherms is typical of silica matrices modified by complexing substances.…”

“…A large number of sorption methods have been proposed and used for the pre-concentration and removal of trace elements in the food and pharmaceutical industry, water purification, etc. With the purpose of concentrating and removing traces of metal species occurring in aqueous solutions several adsorbents have been studied, there are included activated carbon, polymers, ion exchangers, chelating resins and many others [8][9][10].…”