Facile synthesis of PANI-modified CoFe2O4–TiO2 hierarchical flower-like nanoarchitectures with high photocatalytic activity
Facile synthesis of PANI-modified CoFe2O4–TiO2 hierarchical flower-like nanoarchitectures with high photocatalytic activity
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DOI：
10.1007/s11051-013-1643-0
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发表时间：
2013-04
影响因子：
2.5
通讯作者：
C. Leng;Jianhong Wei;Zhengyou Liu;R. Xiong;C. Pan;Jing Shi
中科院分区：
文献类型：
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作者：
C. Leng;Jianhong Wei;Zhengyou Liu;R. Xiong;C. Pan;Jing Shi
采用一种简单的方法合成了聚苯胺修饰的具有多级花状结构的CoFe 2 O 4-TiO 2纳米复合材料。PCT颗粒直径约为420-600 nm，具有纳米和微米尺度的结构，并在紫外光和可见光照射下表现出优异的光吸收性能。与相应的PANI-CoFe 2 O 4和CoFe 2 O 4-TiO 2样品相比，其光催化活性显著提高。PCT优异的光催化活性可归因于PANI、TiO 2和CoFe 2 O 4在三元体系中的协同效应，导致快速的电荷分离和缓慢的电荷复合，从而导致更高的光催化活性。此外，PCT复合材料在一定程度上保持了CoFe 2 O 4的铁磁性能，这可以通过施加外磁场促进其与液相的分离。因此，PCT纳米复合材料是有效的光催化处理废水的有前途的候选人。
Polyaniline-modified CoFe2O4–TiO2-nanocomposites (PCT) with hierarchical flower-like nanoarchitectures were successfully synthesized by a facile procedure. The PCT particles with diameters about 420–600 nm possess both nano- and micro-scale structures, and exhibit excellent light absorption properties both under UV and visible light irradiation. Meanwhile, it shows a dramatic enhancement of photocatalytic activity compared with corresponding PANI–CoFe2O4and CoFe2O4–TiO2samples. The excellent photoactivity of PCT can be attributed to the synergistic effect of PANI, TiO2, and CoFe2O4in the ternary system, which leads to a rapid charge separation and slow charge recombination thereby resulting in a higher photocatalytic activity. In addition, the ferromagnetic properties of CoFe2O4are maintained in the PCT composite to some extent, which can facilitate their separation from the liquid phase via application of an external magnetic field. Therefore, PCT nanocomposites are promising candidates for the effective photocatalytic treatment of wastewater.