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Zinc oxide-coated alpha-phase ferric oxide particles can be used for water purification purposes. This has been demonstrated by Giuliana Impellizzeri and co-workers CNR-IMM (Institute for Microelectronics and Microsystems) Catania, Italy, using a a Picosun R-200 advanced atomic layer deposition (ALD) system to deposit polycrystalline ZnO on alpha-phase ferric oxide (α-Fe2O3) nanoparticles (which were purchased from Sigma-Aldrich).
(a) Transmission electron microscopy images of zinc oxide-coated ferric oxide (Fe2O3) core-shell nanostructures. (b) High magnification image of a single core-shell nanoparticle. (c) High magnification image of a single uncoated Fe2O3nanoparticle. (13 August 2015, SPIE Newsroom. DOI: 10.1117/2.1201508.006078)
Core-shell nanostructures with promising photocatalytic characteristics
Giuliana Impellizzeri, Alessandro Di Mauro, Guillaume Amiard, Simona Boninelli and Vittorio Privitera
One of the most pervasive problems afflicting people today is inadequate access to clean water and sanitation. By 2030—as estimated by the United Nations—47% of the world's population will live in areas with high ‘water stress’ levels. Removing pathogens, chemicals, and other contaminants to produce satisfactory water supplies (i.e., with high throughput and at a low cost) is thus a growing challenge around the world. It is thought, however, that nanotechnology can be used to improve water purification techniques. It should also be possible to reduce the cost of prohibitively expensive water cleaning methods, which are currently unaffordable for many developing countries
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