Abstract
The surface properties of photocatalysts significantly affect the photocatalytic activity. For this reason, it is desirable to boost the photocatalytic activity of BiOBr photocatalysts via surface modification. In this demonstration, C60 was used to decorate BiOBr by a microwave hydrothermal method. The flower-like C60/BiOBr photocatalysts, assembled by nanosheets, were carefully examined with structural, optical, and compositional analyses. The results confirm that C60 and BiOBr have been combined together. Because of the existence of synergistic interaction, C60/BiOBr has a higher specific surface area, higher partition and migration of photoinduced carriers, higher surface hydroxyl and O2− levels, higher oxygen vacancies (OVs) concentration on the catalytic surface. The formation of O2− was significantly enhanced, confirmed by nitrotetrazolium blue chloride (NBT) measurements. O2− can be effectively formed by two channels. Based on the photodestruction result of Rhodamine B (RhB), the photocatalytic activity of C60/BiOBr composites was significantly boosted. In light of all the observations and the high electron affinity of C60, separation of photoinduced carriers and a formation mechanism of active free radicals is proposed.
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