Author/Authors :
Gong, Weiwei , Xue, Jiongwei Peking University, China , Zhang, Kai Peking University, China , Wu, Zhan Peking University, China , Wei, Dapeng Peking University, China , Chen, Qing Peking University, China , Pan, Huayong Peking University, China , Xu, Shengyong Peking University, China
Abstract :
Polyoxometalates have been widely used in the fields of catalysis, analytical chemistry, biochemistry, medicine and synthesis of novel organic-inorganic materials. It is difficult tosynthesize pure polymolybdate products from a solution because several kinds of molybdenum-based anions may coexist. As a result, varied acidification methods are commonly used for solution synthesis of polymolybdates. In this paper we report an approach for thesynthesis of [001]-oriented K2Mo3O10·3H2o nanowires from an aqueous solution of (NH4)6Mo7O24-4H2O and KCl at low temperatures. The reaction occurs even at temperatures as low as 0 °C, and at 30-90 °C the whole procedure needs only a few minutes. Without anyadditional acidification treatments, the pH value of the solution is maintained in a narrow range of ±0.1 between 4.9 and 5.5 during the whole synthesis procedure. The starting pH depends on the reaction temperature. Crystalline structure and purity of the final products have been characterized with x-ray diffraction, electron diffraction and dehydration measurements. This simple and rapid method provides a unique case for studying the growth mechanism of polymolybdate nanostructures, and has a promising potential in the mass production oflow-cost, pure-phase polymolybdates for a variety of applications.
