Aggregation and Magnetic Separation of Polyethylene Microparticles from Aqueous Solutions

The determination of the amount and composition of artificial polymer microparticles in ponds requires the preparation of representative water samples. A new method has been proposed in this work for magnetic separation of polyethylene microparticles (PEMPs, 10–200 μm), with the method implying thei...

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Veröffentlicht in:Colloid journal of the Russian Academy of Sciences 2024-11, Vol.86 (6), p.967-979
Hauptverfasser: Filinkova, M. S., Bakhteeva, Yu. A., Medvedeva, I. V., Byzov, I. V., Minin, A. S., Kurmachev, I. A.
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container_end_page 979
container_issue 6
container_start_page 967
container_title Colloid journal of the Russian Academy of Sciences
container_volume 86
creator Filinkova, M. S.
Bakhteeva, Yu. A.
Medvedeva, I. V.
Byzov, I. V.
Minin, A. S.
Kurmachev, I. A.
description The determination of the amount and composition of artificial polymer microparticles in ponds requires the preparation of representative water samples. A new method has been proposed in this work for magnetic separation of polyethylene microparticles (PEMPs, 10–200 μm), with the method implying their aggregation with magnetic nanoparticles. Composite magnetic nanoparticles containing magnetite cores and silica shells functionalized with amino groups (Fe 3 O 4 @SiO 2 –NH 2 , d hydr = 200 nm) have been synthesized and characterized. Due to electrostatic interactions, these nanoparticles can form aggregates with polyethylene particles and be separated from water under the action of a gradient magnetic field. The effects of added salts (NaCl, Na 2 SO 4 , NaH 2 PO 4 , and CaCl 2 ) and a surfactant, sodium dodecyl sulfate (SDS), on the separation conditions of PEMPs from water have been studied. It has been shown that the addition of the magnetic particles in concentration c = 0.01 g/L to aqueous suspensions containing NaCl and NaH 2 PO 4 ( c = 10 mM), and SDS ( c = 3 mM) provides an efficiency of magnetic separation of PEMPs equal to, at least, 98% after preliminary exposure for 30 min and magnetic sedimentation for 15 min. As the concentration of NaCl and NaH 2 PO 4 is increased to 100 mM or in the presence of Na 2 SO 4 , the efficiency of PEMP magnetic separation decreases. In the presence of CaCl 2 and SDS, the efficiency of the magnetic sedimentation is no less than 98% at the studied concentrations of the salts. At least 80% of PEMPs are separated by magnetic filtration from model solutions simulating river and sea water within 5 min.
doi_str_mv 10.1134/S1061933X24600581
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As the concentration of NaCl and NaH 2 PO 4 is increased to 100 mM or in the presence of Na 2 SO 4 , the efficiency of PEMP magnetic separation decreases. In the presence of CaCl 2 and SDS, the efficiency of the magnetic sedimentation is no less than 98% at the studied concentrations of the salts. 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subjects Aqueous solutions
Calcium chloride
Chemistry
Chemistry and Materials Science
Efficiency
Iron oxides
Magnetic separation
Microparticles
Nanoparticles
Polyethylene
Polyethylenes
Polymer Sciences
Seawater
Sedimentation
Sedimentation & deposition
Silicon dioxide
Sodium dodecyl sulfate
Sodium phosphate
Sodium sulfate
Surfaces and Interfaces
Thin Films
Water purification
Water sampling
title Aggregation and Magnetic Separation of Polyethylene Microparticles from Aqueous Solutions
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