Removal of lead ions from wastewater using magnesium sulfide nanoparticles caged alginate microbeads

In this study, an adsorbent made of alginate (Alg) caged magnesium sulfide nanoparticles (MgS) microbeads were used to treat lead ions (Pb2+ ions). The MgS nanoparticles were synthesized at low temperatures, and Alg@MgS hydrogel microbeads were made by the ion exchange process of the composite mater...

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Bibliographic Details
Published in:Environmental research 2023-01, Vol.216 (Pt 1), p.114416, Article 114416
Main Authors: Esmaeili Bidhendi, Mehdi, Parandi, Ehsan, Mahmoudi Meymand, Masoumeh, Sereshti, Hassan, Rashidi Nodeh, Hamid, Joo, Sang-Woo, Vasseghian, Yasser, Mahmoudi Khatir, Nadia, Rezania, Shahabaldin
Format: Article
Language:English
Subjects:
adsorbents
Adsorption
Adsorption equilibrium
Alginate microbeads
Alginates - chemistry
chelation
hydrogels
Hydrogen-Ion Concentration
ion exchange
Kinetic
Kinetics
Lead
Lead removal
Magnesium
Magnesium sulfide nanoparticles
microbeads
Microspheres
Nanoparticles
sodium alginate
sorption isotherms
Spectroscopy, Fourier Transform Infrared
Sulfides
temperature
Wastewater
Water Pollutants, Chemical - analysis
Water Purification
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Summary:In this study, an adsorbent made of alginate (Alg) caged magnesium sulfide nanoparticles (MgS) microbeads were used to treat lead ions (Pb2+ ions). The MgS nanoparticles were synthesized at low temperatures, and Alg@MgS hydrogel microbeads were made by the ion exchange process of the composite materials. The newly fabricated Alg@MgS was characterized by XRD, SEM, and FT-IR. The adsorption conditions were optimized for the maximum removal of Pb2+ ions by adjusting several physicochemical parameters, including pH, initial concentration of lead ions, Alg/MgS dosage, reaction temperature, equilibration time, and the presence of co-ions. This is accomplished by removing the maximum amount of Pb2+ ions. Moreover, the adsorbent utilized more than six times with a substantial amount (not less than 60%) of Pb2+ ions was eliminated. Considering the ability of sodium alginate (SA) for excellent metal chelation and controlled nanosized pore structure, the adsorption equilibrium of Alg@MgS can be reached in 60 min, and the highest adsorption capacity for Pb2+ was 84.7 mg/g. The sorption mechanism was explored by employing several isotherms. It was found that the Freundlich model fits the adsorption process quite accurately. The pseudo-second-order model adequately described the adsorption kinetics.
ISSN:0013-9351
1096-0953
DOI:10.1016/j.envres.2022.114416