Facile Fabrication and Optical Property of Hollow SnO₂Spheres and Their Application in Water Treatment

Abstract

Hollow SnO(2) spheres with smooth surface have been fabricated by a low temperature template-free solution phase route via self-assembly of small nanocrystalline particles. These hollow spheres have a very thin shell thickness of about 10 nm and are built from SnO(2) nanocrystals of an average size of 5.3 nm. The evacuation behavior of inside-out Ostwald ripening can be used to explain the formation of hollow spheres according to results of time-dependent reactions. The cathodoluminescence spectrum indicates a blue shift of the band gap emission peak of SnO(2), originating from quantum confinement effect due to the nanoscale size of SnO(2) particles. The as-prepared SnO(2) hollow spheres were also found to exhibit excellent performance in wastewater treatment.

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“…Semiconductor metal oxides, typically such as titanium dioxide (TiO 2 ), zinc oxide (ZnO), tin oxide (SnO 2 ), nickel oxide (NiO) and cuprous oxide (Cu 2 O), have been used as photocatalysts [3][4][5][6][7]. Among them, TiO 2 is widely investigated because of its high photocatalytic activity, biological and chemical inertness, and non-toxic nature.…”

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