Abstract
α-Fe2O3@SnO2 core–shell microspheres with heterostructures were successfully designed and fabricated using Na2SnO3·4H2O as the tin source. The influence of Sn/Fe molar ratio and calcination temperature on the morphology and structures of α-Fe2O3@SnO2 microspheres were systematically investigated. For the Sn/Fe molar ratio between 0.5 and 1.0, the optical absorption capacity of α-Fe2O3@SnO2 microspheres is higher than that of pure SnO2 because of the heterostructures. With increasing the calcination temperature, the degree of crystallization and specific surface area of α-Fe2O3@SnO2 microspheres also are progressively improved. The photocatalytic performance for Rhodamine B (RhB) degradation was subsequently assessed under sunlight-like irradiation. After calcination at 600 °C, the Fe/Sn-0.75 sample demonstrates the significant acceleration of photocatalytic degradation rates. The photocatalytic degradation rate under light irradiation after 8 h reaches 93.30 % and maintains at 89.98 % even after five cycles.
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