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Core–shell structure [Formula: see text] was synthesized by sol–gel method. The photocatalytic degradation of methylene blue over the [Formula: see text] reached 98% under UV light irradiation within 5 h. The band gap of the core–shell [Formula: see text] was found to have a redshift through a sintering treatment. The redshifted [Formula: see text] had a good performance of methylene-blue degradation (reaching 85%) under visible light irradiation for 5 h.

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