Visible light photocatalytic properties of polymorphic brookite titania

Visible light (VL) active titania was prepared via ambient condition sol process. The particles precipitated from titanium tetrachloride solution followed by lattice dehydroxylation using hot N-methylpyrrolidone (NMP) yielded a mixed crystal phase of brookite titania with anatase as the minor phase. The mixed phase titania exhibited superior photocatalytic activities for an organic dye and hydrogen evolution from an aqueous solution under 14 W VL as compared with several other available reference titanias. The superior VL photocatalytic activity may be explained as the effective charge separation by the intercrystalline electron transport from brookite to anatase grains complemented by the strong VL absorption by the nitrogen species in NMP. The probable electron transport mechanism is illustrated. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3096606]open116sci

Visible light photocatalytic properties of polymorphici brookite titania

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Synthesis of Nanoparticles via Solvothermal and Hydrothermal Methods

This chapter summarizes the synthesis of various types of nanoparticles as well as surface modifications of nanomaterials using hydrothermal and solvothermal methods. First, the definition, history, instrumentation, and mechanism of hydrothermal and solvothermal methods as well as the important parameters affecting the nucleation and crystal growth of nanomaterials are briefly introduced. Then, the specific hydrothermal and solvothermal methods used to grow oxides; Groups II–VI, III–V, and IV; transitional metals; and metal-organic framework nanoparticles are summarized. Finally, the hydrothermal and solvothermal strategies used for the surface modification of nanomaterials are discussed