The solar-light-harvesting and separation of nanostructured photocatalysts in slurry systems are key issues in fields of photocatalysis. Herein, magnetic Fe₂O₃/mesoporous black TiO₂ hollow sphere heterojunctions (M-Fe₂O₃/b-TiO₂) are fabricated through wet-impregnation and surface hydrogenation strategy, which show wide-spectrum response and magnetic separation. The decreased specific surfaces, pore sizes and pore volumes from ∼80 to 67 m² g⁻¹, ∼12 to 10.3 nm, and ∼0.20 to 0.16 cm³ g⁻¹, respectively, all confirm the efficient loading of magnetic Fe₂O₃. The M-Fe₂O₃/b-TiO₂ with narrow bandgap of ∼2.41 eV extends the photoresponse from UV to near infrared region and exhibits excellent solar-driven photocatalytic degradation performance and long-term stability for complete mineralization methyl orange and high-toxic herbicide metribuzin. The photocatalytic reaction apparent rate constant k for metribuzin is ∼ 9 times higher than that of pristine TiO₂ under AM 1.5 irradiation. Especially for single-wavelength of 950 nm, the degradation ratio is up to 4%. The enhancement is attributed to Ti³⁺ and magnetic Fe₂O₃ with narrow bandgap facilitating solar-light-harvesting, the hollow structure benefiting mass transport, and the heterojunctions favoring the spatial separation of photogenerated electron-hole pairs. The magnetic separation is conducive to recycle of photocatalysts, which favors practical applications in environment.

中文翻译：

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具有广谱响应和磁分离特性的磁性Fe ₂ O ₃ /中孔黑色TiO ₂空心球形异质结

浆料体系中纳米结构光催化剂的日光收集和分离是光催化领域的关键问题。本文通过湿法浸渍和表面加氢制备了Fe ₂ O ₃ /介孔黑色TiO ₂中空球形异质结（M-Fe ₂ O ₃ / b-TiO ₂），表现出广谱响应和磁分离特性。比表面积，孔径和孔体积分别从〜80至67 m ²  g ^-1减小，从12至10.3 nm减小，从0.20至0.16 cm ³  g ^-1减小，所有这些都证实了磁性Fe ₂ O的有效负载。₃。具有约2.41 eV的窄带隙的M-Fe ₂ O ₃ / b-TiO ₂将光响应从UV扩展到近红外区域，并具有出色的太阳能驱动的光催化降解性能和长期稳定性，可完全矿化甲基橙和有毒的除草剂metribuzin。在AM 1.5辐照下，Metribuzin的光催化反应表观速率常数k约为原始TiO _2的9倍。特别是对于950 nm的单波长，降解率高达4％。增强归因于Ti ³⁺和磁性Fe ₂ O ₃窄带隙有利于太阳光的收集，空心结构有利于质量传输，异质结有利于光生电子-空穴对的空间分离。磁分离有利于光催化剂的再循环，这有利于在环境中的实际应用。