Lead Retention and Complexation in a Magnesium Smectite (Hectorite)

Cu(II) Sorption Mechanism on Montmorillonite: An Electron Paramagnetic Resonance Study

“…XAFS (X-ray absorption fine structure) (21)(22)(23)(24)(25)(26), NMR (nuclear magnetic resonance) (27,28), IR (infrared) (6,29), and (20). The sorption is ionic strength dependent in the acidic pH range (I), pH dependent in the near neutral pH range (II), and ionic strength and pH independent in the basic pH range (III).…”

“…Numerous experimental studies have been conducted on the sorption of heavy metals on oxide and clay minerals because of its environmental significance (1)(2)(3)(4)(5)(6)(7)(8)(9). In most cases, experimental sorption data have been macroscopically interpreted through empirical means such as partition coefficient and adsorption isotherms (4)(5)(6). But as they contain no specific information on sorption mechanism, surface complexation modeling approaches have been developed to obtain mechanistic information from the batch sorption data (7)(8)(9)(10)(11)(12)(13)(14).…”

Characterization of aqueous lead removal by phosphatic clay: Equilibrium and kinetic studies

“…The effects of various factors such as pH, ionic strength and nature of ligands influencing Pb sorption have been studied using both pure minerals such as goethite [9,14], silicate clay minerals [15][16][17][18][19] and soils [20,21]. In the past, several studies explored the feasibility of using apatite as a potential reactive media to remediate heavy metal contaminated soils, sediments, mining wastes and contaminated surface and groundwater [4][5][6].…”

Fissure and mineral weathering impacts on heavy metal distribution in sludge-amended soil

“…This behaviour is related to the high susceptibility of plagioclases to weathering into a dominant smectite clayey plasma, with minor kaolinite. The smectitic component, with very large adsorption capacity (90 to 127 cmol kg -1 : Siantar and Fripiat 1995;Ayari et al 2005;Srodon and McCarty 2008) compared to that of kaolinite (16 to 34 cmol kg-1, (Ferris and Jepson 1975;Ma and Eggleton 1999) adsorbs, in the plagioclase weathering microsites, the Zn and Pb released from the amphiboles and biotites leaching (Mellah and Chegrouche 1997;Naseem and Tahir 2001;Ayari et al 2007). The vertical distribution of MTE in the plagioclase-derived clay minerals (Table 4) reveals a global leaching of Zn and Pb from surface horizons of the amended soil when compared to R horizon (CS8) (Fig.…”