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- W2123841027 abstract "The importance of the surface charge of clay minerals (fixed or variable) and the effect of H + ions on the adsorption and removal of Pb 2+ ions from contaminated soil are investigated using kaolinite (variable charge) and two illitic (fixed charge) soils with pH 3.9 and 9.2. The adsorption-desorption characteristics of Pb 2+ ions were determined using batch equilibrium tests and acid leach tests with various acids used to leach the soils. Under the same adsorption conditions, illitic soil adsorbed much more Pb 2+ ions than kaolinite. The difference is largely due to the surface charges on the clay minerals. Removal of Pb 2+ ions from variable-charge minerals (e.g., kaolinite) requires much less effort than removal of Pb 2+ ions from constant-charge minerals (e.g., illite). The surface charge of a clay mineral has an important effect. By increasing the number of H + ions available in the soil system with a buffer solution such as NaOAc-HOAc, heavy metals adsorbed on the clay surface are expelled to pore water. The increase in H + ions in the soil system also assists in dissolving any metal carbonates, thereby increasing the solubility of heavy metals in illitic soil. The more H + ions available in the pore fluid, the more Pb 2+ ions can be released from the system.Key words: clay minerals, sorption, desorption, heavy metal, hydrogen ion, electrokinetic, acid leach." @default.
- W2123841027 created "2016-06-24" @default.
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- W2123841027 date "2000-04-01" @default.
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- W2123841027 title "The role of clay minerals and the effect of H<sup>+</sup> ions on removal of heavy metal (Pb<sup>2+</sup>) from contaminated soils" @default.
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- W2123841027 doi "https://doi.org/10.1139/t99-106" @default.
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