, Volume 4, Issue 10, pp 1241-1246,
Open Access This content is freely available online to anyone, anywhere at any time.
Date: 17 Jul 2009

Hollow Sodium Tungsten Bronze (Na0.15 WO3 ) Nanospheres: Preparation, Characterization, and Their Adsorption Properties


We report herein a facile method for the preparation of sodium tungsten bronzes hollow nanospheres using hydrogen gas bubbles as reactant for chemical reduction of tungstate to tungsten and as template for the formation of hollow nanospheres at the same time. The chemical composition and the crystalline state of the as-prepared hollow Na0.15WO3 nanospheres were characterized complementarily, and the hollow structure formation mechanism was proposed. The hollow Na0.15WO3 nanospheres showed large Brunauer–Emment–Teller specific area (33.8 m2 g−1), strong resistance to acids, and excellent ability to remove organic molecules such as dye and proteins from aqueous solutions. These illustrate that the hollow nanospheres of Na0.15WO3 should be a useful adsorbent.

Graphical Abstract


Novel sodium tungsten bronze, Na0.15WO3, hollow nanospheres were successfully fabricated using the hydrogen gas bubbles as both reactant to reduce the tungstate to tungsten and template to direct the hollow structure formation at the same time. The removal capacity of as-synthesized hollow Na0.15WO3 nanospheres to small organic molecules and proteins from acidic waste water was explored as well.