Abstract
The method for immobilizing TiO2 nanoparticles on Fe3O4 was presented. On the base of microscopic and spectroscopic characterizations, the prepared Fe3O4@TiO2 nanoparticle composites were employed as a heterogeneous photocatalyst to catalyze the synthesis of 2-substituted benzimidazoles under incandescent light. The composite material exhibited the enhanced photoactivity compared to bare TiO2 and Fe3O4, being able to yield a variety of 2-substituted benzimidazoles in moderate to good yield with recyclability and stability. A possible photocatalysis mechanism was investigated based on the free radical scavengers tracking method. It was evident that holes, ·OH radical and singlet oxygen played the important roles in the synthesis of 2-substituted benzimidazole.
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