One‐Step Hydrothermal Synthesis of 2D Hexagonal Nanoplates of α‐Fe 2 O 3 /Graphene Composites with Enhanced Photocatalytic Activity
2014; Wiley; Volume: 24; Issue: 36 Linguagem: Inglês
10.1002/adfm.201401279
ISSN1616-3028
AutoresSancan Han, Linfeng Hu, Ziqi Liang, S. Wageh, Ahmed A. Al‐Ghamdi, Yongsheng Chen, Xiaosheng Fang,
Tópico(s)Advanced Photocatalysis Techniques
ResumoThere has been significant progress in the field of semiconductor photocatalysis, but it is still a challenge to fabricate low‐cost and high‐activity photocatalysts because of safety issues and non‐secondary pollution to the environment. Here, 2D hexagonal nanoplates of α‐Fe 2 O 3 /graphene composites with relatively good distribution are synthesized for the first time using a simple, one‐step, template‐free, hydrothermal method that achieves the effective reduction of the graphene oxide (GO) to graphene and intimate and large contact interfaces of the α‐Fe 2 O 3 nanoplates with graphene. The α‐Fe 2 O 3 /graphene composites showed significantly enhancement in the photocatalytic activity compared with the pure α‐Fe 2 O 3 nanoplates. At an optimal ratio of 5 wt% graphene, 98% of Rhodamine (RhB) is decomposed with 20 min of irradiation, and the rate constant of the composites is almost four times higher than that of pure α‐Fe 2 O 3 nanoplates. The decisive factors in improving the photocatalytic performance are the intimate and large contact interfaces between 2D hexagonal α‐Fe 2 O 3 nanoplates and graphene, in addition to the high electron withdrawing/storing ability and the highconductivity of reduced graphene oxide (RGO) formed during the hydrothermal reaction. The effective charge transfer from α‐Fe 2 O 3 nanoplates to graphene sheets is demonstrated by the significant weakening of photoluminescence in α‐Fe 2 O 3 /graphene composites.
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