Controllable Preparation of Multishaped Micro/nano-sized Hydrated Nickel Molybdate via Chelator-assisted Hydrothermal Route

摘要

Nickel molybdate is one of the significant and frequently-used basis materials for catalyst. The micro/nano hydrated nickel molybdate with different shapes has been successfully prepared via hydrothermal route using chelator as shape-control agent under the pH values from 4.5 to 6.4. The x-ray powder diffractometry, transmission electron microscope and scanning electron microscope were employed for the characterization and analysis of the phase, morphology and size of the resulting products. The chelator plays a key role for the shape and crystalline degree of the hydrated nickel molybdate. With the pH values of the initial suspension set below 4.5 or above 6.4, no any solid products could be obtained despite using the same hydrothermal preparation conditions. The formation mechanism of the related products with multiple shapes has been proposed.