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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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Tauanov, Z.
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Topics
Publications (4/4 displayed)
- 2020Mercury reduction and chemisorption on the surface of synthetic zeolite silver nanocompositescitations
- 2019Synthetic sodalite doped with silver nanoparticlescitations
- 2019Removal of iodide from water using silver nanoparticles-impregnated synthetic zeolitescitations
- 2018Synthetic coal fly ash-derived zeolites doped with silver nanoparticles for mercury (II) removal from watercitations
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article
Mercury reduction and chemisorption on the surface of synthetic zeolite silver nanocomposites
Abstract
<p>This work presents the utilization of a coal power plants waste, namely coal fly ash for the synthesis of zeolites and zeolite silver nanocomposites for the removal of Hg<sup>2+</sup> from water. Equilibrium data are derived for all materials for mercury concentration range of 10–500 mg/L and models are applied. The removal mechanisms are discussed in detail and complemented by XRD, XRF, SEM-EDS, and TEM characterizations and water phase mercury speciation modeling. According to findings, the adsorption capacity of zeolites is about 4 mg/g and increased by almost 5 times after the modification with silver nanoparticles to 20.5–22.3 mg/g. Langmuir equilibrium model fits well the experimental data of the nanocomposites indicating monolayer adsorption process. The mechanism is complex, involving Hg<sup>2+</sup> reduction to Hg<sup>+</sup> and possibly Hg<sup>0</sup> followed by formation of calomel and amalgams on the surface of the nanocomposites. The mercury reduction is accompanied by Ag<sup>0</sup> oxidation to Ag<sup>+</sup> and subsequent formation of silver chloride.</p>