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

作　　者：Wanquan Jiang Xueping Zhang Xinglong Gong Fangfang Yan Zhong Zhang 

机构地区：[1]Department of Chemistry,University of Science and Technology of China(USTC),Hefei 230026,PR China [2]CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Modern Mechanics,USTC,Hefei 230027,PR China [3]National Center for Nanoscience and Technology,Beijing 100080,PR China

出　　处：《International Journal of Smart and Nano Materials》2010年第4期278-287,共10页国际智能和纳米材料杂志（英文）

基　　金：support from National Basic Research Program of China(973 Program,Grant No.2007CB936800);SRFDP of China(Project No.20093402110010)are gratefully acknowledged.

摘　　要：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 core.The Fe_(3)O_(4)nanoparticles were partially embedded in TiO_(2)agglomerates.TiO_(2)nanocrystallites were obtained by hydrolysis and condensation of titanium tetraisopropyl in the presence of ethanol and water under high-intensity ultrasound irradiation.This 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 phase.In comparison to other methods,the developed method is simple,mild,green and efficient.The magnetization hysteresis loop for Fe_(3)O_(4)–TiO_(2)nanocomposites indicates that the hybrid catalyst shows superparamagnetic characteristics at room temperature.Photocatalytic activity studies confirmed that the as-prepared nanocomposites have high photocatalytic ability toward the photodegradation of RhB solution.Furthermore,the photodecomposition rate decreases only slightly after six cycles of the photocatalysis experiment.Thus,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 

分 类 号：O62[理学—有机化学]