TiO2micro-/nano-structures with different morphologies have been successfully synthesized via a hydrothermal method. The effects of the solvents on the morphology and structure of the obtained products have been studied. The objective of the present paper is to compare the photocatalytic properties of the obtained TiO2products. During the synthesis process, the tetrabutyl titanate and titanium (IV) fluoride were used as the titanium source. The obtained micro-/nano-structures were characterized by field-emission scanning electron microscopy, X-ray diffraction analysis, and nitrogen adsorption-desorption isotherms. The photocatalytic activity of the samples was evaluated by the degradation of Rhodamine B solution under simulated solar irradiation. It is found that the morphologies and structures of TiO2have a great influence on its photocatalytic activity. Compared with other samples, TiO2flower clusters assembled with nanorods exhibited a superior photocatalytic activity in the degradation of Rhodamine B.Keywords:TiO2;different morphologies;photocatalytic activity;formation mechanisms
Gui-Sheng Zeng,Jian Yu,Hong-Yun Zhu,Hui-Long Liu,Qiu-Ju Xing,Shao-Kui Bao,Shun He,Jian-Ping Zou,Chak-Tong Au
For the first time, InTaO4 photocatalysts with different morphologies and structures were facilely prepared using a versatile sol precursor. SEM, TEM and HRTEM were used to characterize their structures and morphologies. The as-synthesized materials exhibit different physicochemical properties. Compared to InTaO4 nanoparticles and SiO2@InTaO4 core–shell nanospheres, InTaO4 nanofibers have higher light absorption ability, larger specific surface area, and better photocatalytic activity for hydrogen evolution. We proposed mechanisms for the formation and photocatalytic activity of the three catalysts. The present work not only provides a new approach for the synthesis of tantalates that are different in morphology and structure but also offers new insights into the controllable preparation of photocatalysts through a versatile precursor for environmental and energy applications.
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