Total removal of Hg (II) from wastewater using magnetic nanoparticles coated with nanometric Ag and functionalized with sodium 2-mercaptoethane sulfonate
Autor: | Antonio Soto-Meca, Manuel Caravaca, Yesica Vicente-Martínez |
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Rok vydání: | 2020 |
Předmět: |
Chemistry
Sodium Nanoparticle chemistry.chemical_element Langmuir adsorption model 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Mercury (element) Metal chemistry.chemical_compound symbols.namesake Adsorption Sulfonate Wastewater visual_art symbols visual_art.visual_art_medium Environmental Chemistry 0210 nano-technology 0105 earth and related environmental sciences Nuclear chemistry |
Zdroj: | Environmental Chemistry Letters. 18:975-981 |
ISSN: | 1610-3661 1610-3653 |
Popis: | Divalent mercury (Hg (II)) is the predominant mercury species in aquatic environments. Hg (II) combines easily with human enzymes, thus causing acute diseases, even at very low concentrations. Among existing procedures to remove Hg (II) from water, adsorption is widely used, achieving high removal efficiencies. However, most actual adsorption techniques require high temperatures, long times or tedious procedures. Here we present a novel, simple and fast method to remove Hg (II) from wastewater by using magnetic-core nanoparticles coated with metallic silver and functionalized with sodium 2-mercaptoethane sulfonate. This adsorbent was characterized by field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy and Brunauer–Emmett–Teller analysis, which showed a contact surface area of the adsorbent equal to 116.476 m2/g. The equilibrium isotherm is characterized by the Langmuir model. Results show that 100% adsorption efficiency is achieved in 30 seconds of contact time, at pH 6.2 and room temperature, employing a low dose of adsorbent. The adsorbent can be recovered and recycled, keeping 100% adsorption efficiency for two additional cycles. The presence of other ions commonly found in aqueous media does not interfere with Hg (II) adsorption. |
Databáze: | OpenAIRE |
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