Zerovalent Iron Nanoparticles-Alginate Nanocomposites for Cr(VI) Removal in Water—Influence of Temperature, pH, Dissolved Oxygen, Matrix, and nZVI Surface Composition
The immobilization of zerovalent iron nanoparticles (nZVI) is a way to facilitate their use in continuous flow systems for the treatment of aqueous pollutants. In this work, two types of nZVI (powdered, NSTAR; and slurry suspended, N25) were immobilized in millimetric alginate beads (AL) by coagulat...
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MDPI AG
2022-02-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/14/3/484 |
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| author | Marguerite Parnis Fabiana Elena García Melanie Victoria Toledo Víctor Nahuel Montesinos Natalia Quici |
| author_facet | Marguerite Parnis Fabiana Elena García Melanie Victoria Toledo Víctor Nahuel Montesinos Natalia Quici |
| author_sort | Marguerite Parnis |
| collection | DOAJ |
| description | The immobilization of zerovalent iron nanoparticles (nZVI) is a way to facilitate their use in continuous flow systems for the treatment of aqueous pollutants. In this work, two types of nZVI (powdered, NSTAR; and slurry suspended, N25) were immobilized in millimetric alginate beads (AL) by coagulation, forming nanocomposites (NCs). These NCs, N25@AL and NSTAR@AL, were structurally studied and tested for Cr(VI) removal. For both NCs types, SEM analysis showed a uniform distribution of the nanoparticles in micron-scale agglomerates, and XRD analysis revealed the preservation of α-Fe as the main iron phase of the immobilized nanoparticles. Additionally, Raman spectroscopy results evidenced a partial oxidation of the initially present magnetite. For both nZVI types, the Cr(VI) removal efficiency increased with temperature, decreased with pH, and did not show any significant change in anoxic or oxic conditions. On the other hand, N25@AL resulted a faster removal agent than NSTAR@AL; however, both materials had the same maximum removal capacity: 133 mg of Cr(VI) per gram of nZVI at pH 3. Cr(III) formed during the removal of Cr(VI) was retained by the alginate matrix, constituting a clear advantage against the use of free nZVI in suspension at acidic pH. |
| first_indexed | 2024-03-09T22:55:38Z |
| format | Article |
| id | doaj.art-e479505179e54317b5824e5a0f085511 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-09T22:55:38Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-e479505179e54317b5824e5a0f0855112023-11-23T18:12:37ZengMDPI AGWater2073-44412022-02-0114348410.3390/w14030484Zerovalent Iron Nanoparticles-Alginate Nanocomposites for Cr(VI) Removal in Water—Influence of Temperature, pH, Dissolved Oxygen, Matrix, and nZVI Surface CompositionMarguerite Parnis0Fabiana Elena García1Melanie Victoria Toledo2Víctor Nahuel Montesinos3Natalia Quici4Centro Atómico Constituyentes, División Química de la Remediación Ambiental, CNEA, CONICET, Gral. Paz 1499, San Martín de los Andes 1650, ArgentinaCentro Atómico Constituyentes, División Química de la Remediación Ambiental, CNEA, CONICET, Gral. Paz 1499, San Martín de los Andes 1650, ArgentinaCentro de Tecnologías Químicas, Departamento de Ingeniería Química, FRBA-UTN, Buenos Aires 1041, ArgentinaCentro Atómico Constituyentes, División Química de la Remediación Ambiental, CNEA, CONICET, Gral. Paz 1499, San Martín de los Andes 1650, ArgentinaCentro Atómico Constituyentes, División Química de la Remediación Ambiental, CNEA, CONICET, Gral. Paz 1499, San Martín de los Andes 1650, ArgentinaThe immobilization of zerovalent iron nanoparticles (nZVI) is a way to facilitate their use in continuous flow systems for the treatment of aqueous pollutants. In this work, two types of nZVI (powdered, NSTAR; and slurry suspended, N25) were immobilized in millimetric alginate beads (AL) by coagulation, forming nanocomposites (NCs). These NCs, N25@AL and NSTAR@AL, were structurally studied and tested for Cr(VI) removal. For both NCs types, SEM analysis showed a uniform distribution of the nanoparticles in micron-scale agglomerates, and XRD analysis revealed the preservation of α-Fe as the main iron phase of the immobilized nanoparticles. Additionally, Raman spectroscopy results evidenced a partial oxidation of the initially present magnetite. For both nZVI types, the Cr(VI) removal efficiency increased with temperature, decreased with pH, and did not show any significant change in anoxic or oxic conditions. On the other hand, N25@AL resulted a faster removal agent than NSTAR@AL; however, both materials had the same maximum removal capacity: 133 mg of Cr(VI) per gram of nZVI at pH 3. Cr(III) formed during the removal of Cr(VI) was retained by the alginate matrix, constituting a clear advantage against the use of free nZVI in suspension at acidic pH.https://www.mdpi.com/2073-4441/14/3/484nZVIalginateCr(VI) removalimmobilizationbiopolymers |
| spellingShingle | Marguerite Parnis Fabiana Elena García Melanie Victoria Toledo Víctor Nahuel Montesinos Natalia Quici Zerovalent Iron Nanoparticles-Alginate Nanocomposites for Cr(VI) Removal in Water—Influence of Temperature, pH, Dissolved Oxygen, Matrix, and nZVI Surface Composition Water nZVI alginate Cr(VI) removal immobilization biopolymers |
| title | Zerovalent Iron Nanoparticles-Alginate Nanocomposites for Cr(VI) Removal in Water—Influence of Temperature, pH, Dissolved Oxygen, Matrix, and nZVI Surface Composition |
| title_full | Zerovalent Iron Nanoparticles-Alginate Nanocomposites for Cr(VI) Removal in Water—Influence of Temperature, pH, Dissolved Oxygen, Matrix, and nZVI Surface Composition |
| title_fullStr | Zerovalent Iron Nanoparticles-Alginate Nanocomposites for Cr(VI) Removal in Water—Influence of Temperature, pH, Dissolved Oxygen, Matrix, and nZVI Surface Composition |
| title_full_unstemmed | Zerovalent Iron Nanoparticles-Alginate Nanocomposites for Cr(VI) Removal in Water—Influence of Temperature, pH, Dissolved Oxygen, Matrix, and nZVI Surface Composition |
| title_short | Zerovalent Iron Nanoparticles-Alginate Nanocomposites for Cr(VI) Removal in Water—Influence of Temperature, pH, Dissolved Oxygen, Matrix, and nZVI Surface Composition |
| title_sort | zerovalent iron nanoparticles alginate nanocomposites for cr vi removal in water influence of temperature ph dissolved oxygen matrix and nzvi surface composition |
| topic | nZVI alginate Cr(VI) removal immobilization biopolymers |
| url | https://www.mdpi.com/2073-4441/14/3/484 |
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