Résumé
The first examples of a new mesoporous form of crystalline β-FeOOH (akaganeite) were prepared by the surfactant-assisted method of nanoparticle assembly using FeCl3 as the precursor and a surfactant of either cationic cetylpyridinium or anionic dodecylsulfonate or nonionic Brij 56 as a hierarchical structure mediator. TEM images indicated the presence of a scaffold-like structure formed through the aggregation and intergrowth of rod-like akaganeite nanoparticles. The synthesized mesoporous akaganeite has a unimodal and very narrow pore size distribution with high surface area, which can be converted to mesostructured α-Fe2O3 (hematite) after degassing at 300°C. Bimodal pore size distributions could be obtained by increasing the synthetic temperature from 40 to 80°C. Mesoporous iron oxides with bicrystalline structure of akaganeite and hydronium jarosite were prepared when using dodecylsulfonate surfactant at 80°C. The surfactants were believed to play an important role in the formation of the hierarchical scaffold-like mesostructure.
langue originale | Anglais |
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Pages (de - à) | 743-750 |
Nombre de pages | 8 |
journal | Catalysis Today |
Volume | 93-95 |
Les DOIs | |
Etat de la publication | Publié - 1 sept. 2004 |
Evénement | Selections from the Presentations of the 3rd Asia-Pacific Congress - Dalian, Chine Durée: 12 oct. 2003 → 12 oct. 2003 |