Adsorption of polymers onto iron oxides: Equilibrium isotherms
The interactions of polymers (corn starch, dextrin from maize starch, humic acid sodium salt and sodium carboxymethyl cellulose) with iron oxides (hematite and magnetite) have been investigated by measuring adsorption isotherms and by electrophoresis. According to the electrophoresis measurements at...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-01-01
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| Series: | Journal of Materials Research and Technology |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785419308415 |
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| author | C.H. Veloso L.O. Filippov I.V. Filippova S. Ouvrard A.C. Araujo |
| author_facet | C.H. Veloso L.O. Filippov I.V. Filippova S. Ouvrard A.C. Araujo |
| author_sort | C.H. Veloso |
| collection | DOAJ |
| description | The interactions of polymers (corn starch, dextrin from maize starch, humic acid sodium salt and sodium carboxymethyl cellulose) with iron oxides (hematite and magnetite) have been investigated by measuring adsorption isotherms and by electrophoresis. According to the electrophoresis measurements at pH 7 both iron oxides present negative surface charge and positive at pH 5. The equilibrium adsorption isotherms were then determined at pH 7 for all the adsorbates except for humic acid which was studied at pH 5, due to its anionic characteristics. The equilibrium data of both iron oxides were studied using Freundlich and Langmuir models and it was found to best fit to the Freundlich one. The values for Freundlich constants indicate that the mechanism that contributes most to the adsorption process in all experiments was the hydrogen bonding. However, the coexistence of more than one adsorption mechanism is what best explains the process itself, in addition to explaining the differences found amongst theories over the years. Keywords: Hematite, Magnetite, Depressant, Adsorption, Isotherm |
| first_indexed | 2024-12-19T03:11:35Z |
| format | Article |
| id | doaj.art-0384767a91d24092969fdb8eca385ced |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-19T03:11:35Z |
| publishDate | 2020-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-0384767a91d24092969fdb8eca385ced2022-12-21T20:37:59ZengElsevierJournal of Materials Research and Technology2238-78542020-01-0191779788Adsorption of polymers onto iron oxides: Equilibrium isothermsC.H. Veloso0L.O. Filippov1I.V. Filippova2S. Ouvrard3A.C. Araujo4Université de Lorraine, CNRS, GeoRessouces, F-54000, Nancy, France; ArcelorMittal Global Research and Development, Voie Romaine, BP 30320 57283 Maizières-lès-Metz, France; Corresponding authors.Université de Lorraine, CNRS, GeoRessouces, F-54000, Nancy, France; Corresponding authors.Université de Lorraine, CNRS, GeoRessouces, F-54000, Nancy, FranceUniversité de Lorraine, CNRS, LSE, F-54000, Nancy, FranceArcelorMittal Global Research and Development, Voie Romaine, BP 30320 57283 Maizières-lès-Metz, FranceThe interactions of polymers (corn starch, dextrin from maize starch, humic acid sodium salt and sodium carboxymethyl cellulose) with iron oxides (hematite and magnetite) have been investigated by measuring adsorption isotherms and by electrophoresis. According to the electrophoresis measurements at pH 7 both iron oxides present negative surface charge and positive at pH 5. The equilibrium adsorption isotherms were then determined at pH 7 for all the adsorbates except for humic acid which was studied at pH 5, due to its anionic characteristics. The equilibrium data of both iron oxides were studied using Freundlich and Langmuir models and it was found to best fit to the Freundlich one. The values for Freundlich constants indicate that the mechanism that contributes most to the adsorption process in all experiments was the hydrogen bonding. However, the coexistence of more than one adsorption mechanism is what best explains the process itself, in addition to explaining the differences found amongst theories over the years. Keywords: Hematite, Magnetite, Depressant, Adsorption, Isothermhttp://www.sciencedirect.com/science/article/pii/S2238785419308415 |
| spellingShingle | C.H. Veloso L.O. Filippov I.V. Filippova S. Ouvrard A.C. Araujo Adsorption of polymers onto iron oxides: Equilibrium isotherms Journal of Materials Research and Technology |
| title | Adsorption of polymers onto iron oxides: Equilibrium isotherms |
| title_full | Adsorption of polymers onto iron oxides: Equilibrium isotherms |
| title_fullStr | Adsorption of polymers onto iron oxides: Equilibrium isotherms |
| title_full_unstemmed | Adsorption of polymers onto iron oxides: Equilibrium isotherms |
| title_short | Adsorption of polymers onto iron oxides: Equilibrium isotherms |
| title_sort | adsorption of polymers onto iron oxides equilibrium isotherms |
| url | http://www.sciencedirect.com/science/article/pii/S2238785419308415 |
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