Controllable Preparation And Characterization Of Alkali Tantalates Microcrystal

Resource crisis and environmental protection are two global issues in the21st century.Tantalates have attracted attention for its high photocatalytic properties. Its photocatalyticproperties not only can prepare hydrogen to save resources but also can degrade organic toprotect environment.Products with different morphology and structure can be prepared by different methods.In this paper, a series of alkali tantalates microcrystals had been successful synthesized bymolten-salt, hydrothermal and state reaction methods. Structures, components andmorphology were confirmed by Thermogravimetric Analysis (TG), X-ray Diffraction(XRD), Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy(FTIR).It was shown that the method of molten-salt can significantly reduce the reaction timeand temperature, and a more uniform appearance was observed. The effects of the reactiontemperatures, the ratio of mass and the surfactants to the synthesis of alkali tantalatesmicrocrystal were studied. The best reaction process was10:1in ratio of mass, and950°Cfor4h, with doping PEG. Er doping of alkali tantalates can significantly reduce thereaction temperature and the best amount of Er was2%.The alkali tantalates nanocrystals were prepared by the method of hydrothermal. Theeffects of the reaction temperature and time, the alkali concentration and doping ofgraphene oxide (GO) to the synthesis of alkali tantalates nanocrystals were studied and thebest reaction process was140°C for12h，with doping Go.Fresh tantalum hydroxides as raw materials can reduce the reaction temperature withthe method of state reaction. Mixing sodium and tantalum hydroxides together and heatingat a low temperature (675oC) produced NaTaO3microcrystal.