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We present a method called solution combustion synthesis by using metal acid radical ions to design nanostructured tungsten oxide with both stoichiometric and oxygen-vacancy-rich nonstoichiometric oxides with excellent photocatalytic activity.

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In this paper, one-dimensional W 18 O 49 nanopowders were fabricated by a one-step solution combustion method using glycine as the fuel and metal acid radical ion as the metal source. The morphologies and non-stoichiometric single-crystal phase of W 18 O 49 can be controlled by changing the amount of the fuel. The nanoneedles had large amount of defects such as oxygen vacancies. This characteristic resulted in an excellent visible driven photocatalytic performance that it took about 50 min to degrade the methylene blue (100 mL; 40 mg•L-1) under visible light. The interesting reaction mechanism of such needle-like W 18 O 49 and photocatalytic mechanism are studied in this paper.As energy shortages and environmental pollution raise awareness of a potential