Modeling of copper(II) and lead(II) adsorption on kaolinite-based clay minerals individually and in the presence of humic acid

Geochemistry as an aid in archaeological prospection and site interpretation: current issues and research directions

“…The role of OM in the retention of Cu in archaeological soils is threefold; ionic interactions between OM and metals and complexation reactions may enhance retention (Singh, 1971;Covelo et al, 2004;Vega et al, 2006); insoluble high molecular weight organic acids can strongly bind Cu (Senesi et al, 1986;Kumpiene et al, 2007) and stabilize Cu through soil acidification (Chirenje and Ma, 1999); and low molecular weight humic-and fulvic acids (HA and FA) can form highly soluble Cu complexes (Hsu and Lo, 2000;Ashworth and Alloway, 2004) and remove Cu from soils. Despite the fact that the latter are likely eluviated from soils, stabilization of HA-Cu and FA-Cu complexes by adsorption onto clay minerals has also been reported (Arias et al, 2002;Hizal and Apak, 2006). Zinc retention shows trends similar to Cu, apart from the fact that Zn is relatively mobile in soils and easily exchanged by other trace metals (Cao et al, 2004).…”

Adsorption of benzoic acid by CTAB exchanged montmorillonite

“…Adsorption on carbon is most popular. Because of the relative high costs of activated carbon, attempts have been made to use clays and clay minerals and some oxides as adsorbents, such as kaolins, bentonites and iron oxides (Krishna et al, 2001;Rosen and Li, 2001;Angove et al, 2002;Espantaleon et al, 2003;Ferreiro and Bussetti, 2003;Hizal and Apak, 2006). The application of clays, especially bentonites has attracted more and more interest because of their high cation exchange capacity, surface area and wide availability.…”

Effects of different coagulants in treatment of TiO2–humic acid (HA) water and the aggregate characterization in different coagulation conditions

“…HA has been shown to be reactive with a variety of oxidants and disinfectants that are used in the purification of drinking water [5]. The adsorption of HA onto minerals was not clearly defined by many researchers due to the nature of the adsorbent surface [6].Various mechanisms which had been proposed to explained the interaction between HA and minerals such as electrostatic interaction, hydrophobic interaction.…”