Cu(II) galvanic reduction and deposition onto iron nano- and microparticles : resulting morphologies and growth mechanisms
The galvanic reduction of heavy metal ions by zerovalent iron nanoparticles is a key process occurring extensively in wastewater remediation, as well as for the synthesis of materials, including catalysts. In this work, we studied the growth of copper species on nano- and micrometer-sized iron parti...
| Veröffentlicht in: | Langmuir : the ACS journal of surfaces and colloids. - 1992. - 31(2015), 2 vom: 20. Jan., Seite 789-98 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2015
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| Zugriff auf das übergeordnete Werk: | Langmuir : the ACS journal of surfaces and colloids |
| Schlagworte: | Journal Article |
| Zusammenfassung: | The galvanic reduction of heavy metal ions by zerovalent iron nanoparticles is a key process occurring extensively in wastewater remediation, as well as for the synthesis of materials, including catalysts. In this work, we studied the growth of copper species on nano- and micrometer-sized iron particles and investigated the morphologies of the resulting structures. The growth proceeds via sacrificial oxidation of iron particles and reduction of Cu(2+) cations from aqueous solutions. Based on the results of transmission and scanning electron microscopy (TEM and SEM), coupled with energy-dispersive X-ray spectroscopy (EDX), electron energy loss spectroscopy (EELS), and X-ray photoelectron spectroscopy (XPS), we proposed two growth mechanisms for the morphologies seen for the copper exposed nano- and microiron particles at varying copper/iron ratios. We observed that, in low Cu/Fe ratios (≤1/100), copper particles decorated the oxide shell of the iron nano/microparticles, while in higher Cu/Fe ratios (≥1/10), Cu-rich hollow structures were formed. Iron microparticles also led to the formation of interesting Cu-fern structures. This study provides insight into the fate of particles used in remediation, as well as recommendations for the synthesis of well-defined materials tailored for precise applications |
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| Beschreibung: | Date Completed 21.05.2015 Date Revised 20.01.2015 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1520-5827 |
| DOI: | 10.1021/la503598b |