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Sonochemical synthesis and characterization of magnetic separable Fe_(3)O_(4)-TiO_(2)nanocomposites and their catalytic properties

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International Journal of Smart and Nano Materials 2010年第4期1卷 278-287页

作者： Wanquan Jiang Xueping Zhang Xinglong Gong Fangfang Yan Zhong Zhang Department of Chemistry University of Science and Technology of China(USTC)Hefei 230026PR China CAS Key Laboratory of Mechanical behavior and Design of Materials Department of Modern MechanicsUSTCHefei 230027PR China National Center for Nanoscience and Technology Beijing 100080PR China

A novel sonochemical method is described for the preparation of Fe_(3)O_(4)–TiO_(2)photocatalysts in which nanocrystalline titanium dioxide particles are directly coated onto a magnetic *** Fe_(3)O_(4)nanoparticles were partially embedded in TiO_(2)***_(2)nanocrystallites were obtained by hydrolysis and condensation of titanium tetraisopropyl in the presence of ethanol and water under high-intensity ultrasound *** method is attractive since it eliminated the high-temperature heat treatment required in the conventional sol–gel method,which is important in transforming amorphous titanium dioxide into a photoactive crystalline *** comparison to other methods,the developed method is simple,mild,green and *** magnetization hysteresis loop for Fe_(3)O_(4)–TiO_(2)nanocomposites indicates that the hybrid catalyst shows superparamagnetic characteristics at room *** activity studies confirmed that the as-prepared nanocomposites have high photocatalytic ability toward the photodegradation of Rhb ***,the photodecomposition rate decreases only slightly after six cycles of the photocatalysis ***,these Fe_(3)O_(4)–TiO_(2)nanocomposites can be served as an effective and conveniently recyclable photocatalyst.

关键词： sonochemical synthesis recyclable photocatalyst TiO_(2)nanocomposite rhodamine b degradation

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Characterization and photocatalytic properties of silver and silver chloride doped TiO_2 hollow nanoparticles

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Chinese Chemical Letters 2012年第12期23卷 1399-1402页

作者： Ping Li Ji Xiang Zheng Kong Jin Gang Wang Xiao Li Zhu College of Chemistry and Chemical Engineering University of Jinan

Using polystyrene （PSt） particles as template, PSt/TiO2 composite particles with AgCl incorporation were prepared through hydrolysis of tetrabutyl titanate in the presence of AgNO3 and NaCl. AgCl doped TiO2 hollow particles were successfully prepared with the PSt/TiO2 composite microspheres pretreated at 180 ℃ followed by calcination. The morphology of PSt/TiO2 particles and the crystal structures of the AgCl doped TiO2 hollow particles were characterized. The photocatalytic activity of the doped TiO2 hollow particles in degradation of rhodamine b was tested under UV and visible lights and compared to that with Ag doped TiO2 particles. The results showed that TiO2 hollow particles, either doped with Ag or AgCl, demonstrated higher photocatalytic activity than the pure TiO2 particles. This enhancement in photocatalytic activity was more significant with AgCl doped TiO2 than that with Ag doped, and more distinct when the degradation was done under visible light than that under UV light.

关键词： TiO2 hollow particles AgCl doping Photocatalysis Light absorption shifting rhodamine b degradation

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