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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Chiriac, Rodica Elena
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Publications (6/6 displayed)
- 2019High-temperature-reactivity of Al–Ti alloys in contact with SiCcitations
- 2015Thermal conductivity of polyimide/boron nitride nanocomposite filmscitations
- 2014Simultaneous precipitation of magnesite and lizardite from hydrothermal alteration of olivine under high-carbonate alkalinitycitations
- 2013Sequential precipitation of a new goethite-calcite nanocomposite and its possible application in the removal of toxic ions from polluted watercitations
- 2013Enhancement of Thermal Conduction of Polyimide/Boron Nitride Nanocompositescitations
- 2008Details on the formation of Ti2Cu3 in the Ag-Cu-Ti system in the temperature range 790-860 °Ccitations
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article
Sequential precipitation of a new goethite-calcite nanocomposite and its possible application in the removal of toxic ions from polluted water
Abstract
This study proposes a simple and innovative synthesis route for a goethite-calcite nanocomposite. This synthesis is summarized by three sequential precipitation reactions: (1) precipitation of nanosized acicular goethite (α-FeOOH) using a high OH/Fe molar ratio (=5); (2) instantaneous precipitation of portlandite (Ca(OH)2) by adding CaCl2 salt to a goethite alkaline suspension (2NaOH + CaCl2=Ca(OH)2 + 2NaCl) and; (3) sub-micrometric calcite precipitation by injection of CO2 into a goethite-portlandite alkaline suspension (Ca(OH)2 + CO2=CaCO3+H2O). The XRD patterns have confirmed the goethite and calcite mineral composition in the composite precipitated at 30 and 70°C. FESEM and TEM observations have revealed the formation of nanosized goethite particles well dispersed with sub-micrometric calcite particles, leading to an orange-brown colour nanocomposite with high specific surface area of around 92 m2/g for a composite synthesized at 30°C and 45 m2/g for a composite synthesized at 70°C. Both values were determined using the conventional BET method on N2 sorption isotherms. Finally, a goethite/calcite weight ratio equal to 0.8 in the composite was determined by thermogravimetric analysis (TGA). Additionally, some adsorption experiments carried out at two different pH values revealed that the goethite-calcite composite has a good sequestration capacity for Cu>Cd>As(III)>Se(IV)>As(V). Conversely, the Se(VI) did not show any chemical affinity with the goethite-calcite composite under the physico-chemical conditions studied. In practice, the goethite-calcite composite can neutralise acidic wastewater by slight calcite dissolution, enhancing the removal of heavy metals (e.g. Cu and Cd) at the calcite-solution interfaces.