Simultaneous adsorption of mercury species from aquatic environments using magnetic nanoparticles coated with nanomeric silver functionalized with l-Cysteine

Autor: Yesica Vicente-Martínez, Manuel Caravaca, Antonio Soto-Meca
Rok vydání: 2020
Předmět:
Environmental Engineering
Silver
Health
Toxicology and Mutagenesis
0208 environmental biotechnology
Inorganic chemistry
Dimethylmercury
Nanoparticle
Infrared spectroscopy
02 engineering and technology
010501 environmental sciences
01 natural sciences
Silver nanoparticle
Metal
chemistry.chemical_compound
symbols.namesake
Adsorption
Spectroscopy
Fourier Transform Infrared
Environmental Chemistry
Cysteine
Magnetite Nanoparticles
0105 earth and related environmental sciences
Chemistry
Public Health
Environmental and Occupational Health
Langmuir adsorption model
General Medicine
General Chemistry
Mercury
Hydrogen-Ion Concentration
Pollution
020801 environmental engineering
Kinetics
Research Design
visual_art
symbols
visual_art.visual_art_medium
Magnetic nanoparticles
Thermodynamics
Water Pollutants
Chemical
Zdroj: Chemosphere. 282
ISSN: 1879-1298
Popis: We introduce a novel, efficient and fast method for the total and simultaneous removal of monomethylmercury, dimethylmercury, ethylmercury and Hg (II) from aquatic environments using magnetic core nanoparticles, coated with metallic nanomeric silver and functionalized with l -Cysteine. As far as the authors know, simultaneous removal has not been achieved previously. The experimental design was based on exploring a wide range of experimental conditions, including pH of the medium (2−12), contact time (up to 20 min), adsorbent dose (50–800 μL) and temperature (293–323 K), in order to achieve the highest adsorption efficiency. The results show that, for a pH equal to 6.2 at room temperature, 400 μL of nanoparticles is sufficient to achieve 100% adsorption efficiency for all the studied Hg species after a contact time of 30 s. The adsorbent was characterized by means of Scanning Electron Microscopy, Energy Dispersive X-ray Analysis, Fourier-Transform Infrared Spectroscopy and a BET test. Moreover, the procedure allows the total recovery and recycling of the nanoparticles using 50 μL of 0.01 M KI. As regards reuse, the adsorbent exhibits no loss of adsorption capacity during the first three adsorption cycles. Thermodynamics reveals that adsorption is of a physicochemical nature, the equilibrium isotherms being described by a Langmuir model for all the Hg species. The ability of the method to simultaneously adsorb all species of mercury present in water, achieving full adsorption in just a few seconds, along with the simple experimental conditions and its cost-effectiveness, strongly support the approach as an alternative to current procedures.
Databáze: OpenAIRE
Externí odkaz: