Abstract
Morphology control and heterostructure construction are two essential aspects in designing and synthesizing photocatalysts. Herein, hollow microsphere heterojunctions of CeO2 and Ce3+ doped BiOBr (Ce-BiOBr) were fabricated adopting a facile one-pot solvothermal approach. Owing to the positively charged Ce species, the interlamellar repulsion can be reduced and the specific surface area of these microsphere can be increased. The as-generated Ce4+/Ce3+ redox centers can synergistically improve the transfer and separation efficiency of photogenerated carriers. When used to treat Congo red (CR), 0.1CBOB with a Ce/Bi molar ratio of 0.1:1 exhibits the best photodegradation efficiency (94.63%) and kinetic rate (0.01119 min−1) under visible light-emitting diode (LED) light irradiation, which are remarkably superior to pure BiOBr and CeO2. The results of radical capture experiment show that photogenerated hole (h+), superoxide radical (·O2−) are the main active species in the process of photocatalytic degradation.
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