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- W342771535 abstract "Abstract Nano-hydrotalcite (nano-HT), particles have been supported on silica and tested for chromium(VI) retention through anion exchange mechanism. Ultra high resolution has been achieved in the structural characterization of the nano-hydrotalcite particles allowing identification of the Cr within few layers of the nanoparticles. Compared to a reference hydrotalcite (HT), in which the Cr(VI) retention takes place via memory effect, nano-HT/SiO2 exhibits better adsorption capacity, for 4 mg/L Cr(VI) solutions, even when the adsorption mechanism of the later is anion exchange. This higher adsorption capacity can be attributed to the considerable smaller size of the crystals, which would favor adsorption kinetics and would minimize possible hindrances between the layers of hydrotalcite. The adsorption behavior of nano-HT/SiO2 can be described by a Freundlich isotherm suggesting a non-uniform surface, which is consistent to their arrangement in nanocrystallites observed by TEM." @default.
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- W342771535 date "2015-09-01" @default.
- W342771535 modified "2023-10-04" @default.
- W342771535 title "Removal of chromium(VI) using nano-hydrotalcite/SiO2 composite" @default.
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- W342771535 doi "https://doi.org/10.1016/j.jece.2015.05.009" @default.
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