Abstract
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 Na0.15WO3nanospheres were characterized complementarily, and the hollow structure formation mechanism was proposed. The hollow Na0.15WO3nanospheres 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 Na0.15WO3should be a useful adsorbent.
Highlights
We report a facile strategy for the fabrication of hollow nanospheres of sodium tungsten bronzes, NaxWO3, and their potential applications in water treatment
The bulk sodium tungsten bronzes can be prepared through the following chemical reaction [20,21,22,23]: Na2WO4 þ NaBH4 þ ð3 À xÞH2O ! NaxWO3 # þNaBO2 þ ð2 À xÞNaOH þ ð4 À 0:5xÞH2 "
The hydrogen generated from the hydrolysis of NaBH4 under acidic reaction condition was partially consumed to reduce tungstate to tungsten, and the rest was released from the reaction system to the air [24]
Summary
We report a facile strategy for the fabrication of hollow nanospheres of sodium tungsten bronzes, NaxWO3, and their potential applications in water treatment. The fabrication, including the control on sizes of Nanoscale Res Lett (2009) 4:1241–1246 the spheres and hollow feature of the hollow NaxWO3 nanospheres, was achieved through reduction of aqueous sodium tungstate (Na2WO4) solution by sodium borohydride (NaBH4) powder under well-controlled pH and temperature.
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