Ti-Modified LaFeO3/β-SiC Alveolar Foams as Immobilized Dual Catalysts with Combined Photo-Fenton and Photocatalytic Activity,ACS Applied Materials & Interfaces

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Ti-Modified LaFeO3/β-SiC Alveolar Foams as Immobilized Dual Catalysts with Combined Photo-Fenton and Photocatalytic Activity
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-12-09 , DOI: 10.1021/acsami.0c16647
Patricia García-Muñoz ₁ , Fernando Fresno ₂ , Christophe Lefevre ₃ , Didier Robert ₁ , Nicolas Keller ₁

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Ti-modified LaFeO₃/β-SiC alveolar foams were used as immobilized, highly robust dual catalysts with combined photocatalytic wet peroxide oxidation and photocatalytic activity under UV-A light. They were prepared by incipient wetness impregnation of a β-SiC foam support, by implementing a sol–gel Pechini synthesis at the foam surface in the presence of dried amorphous sol–gel titania as a titanium source. The physicochemical and catalytic features suggest the stabilization at the foam surface of a substituted La_1–xTi_xFeO₃ catalyst analogous to its powdery counterpart. Taking 4-chlorophenol removal in water as a model reaction, its dual nature enables both high reaction rates and full total organic carbon (TOC) conversion because of a synergy effect, while its macroscopic structure overcomes the drawback of working with powdery catalysts. Further, it yields photonic efficiencies for degradation and mineralization of ca. 9.4 and 38%, respectively, that strongly outperform those obtained with a reference TiO₂ P25/β-SiC foam photocatalyst. The enhancement of the catalyst robustness upon Ti modification prevents any Fe leaching to the solution, and therefore, the optimized macroscopic foam catalyst with 10 wt % catalyst loading operates through pure heterogeneous surface reactions, without any activity loss during reusability test cycles.

中文翻译：

Ti-修饰的LaFeO ₃ /β-SiC泡状泡沫固定化双重催化剂，具有光芬顿和光催化活性

Ti改性的LaFeO ₃ /β-SiC泡状泡沫被用作固定的，高强度的双重催化剂，具有光催化湿式过氧化物氧化和在UV-A光下的光催化活性。它们是通过在湿态无定形溶胶-凝胶二氧化钛作为钛源存在下，在泡沫表面上进行溶胶-凝胶Pechini合成，通过对β-SiC泡沫载体进行初期湿润浸渍而制备的。理化特性和催化特性表明，取代的La _{1– x} Ti _x FeO ₃在泡沫表面具有稳定性催化剂类似于其粉末状对应物。以去除水中的4-氯苯酚为模型反应，由于具有协同效应，其双重性质可实现高反应速率和完全的总有机碳（TOC）转化，而其宏观结构则克服了使用粉状催化剂的缺点。此外，它产生光子效率以降解和矿化钙。分别是9.4％和38％的性能明显优于使用参比TiO ₂所获得的性能P25 /β-SiC泡沫光催化剂。Ti改性后催化剂稳健性的增强可防止任何Fe浸出到溶液中，因此，具有10 wt％催化剂负载的优化宏观泡沫催化剂可通过纯净的非均相表面反应进行操作，而在可重复使用性测试周期中不会损失任何活性。

更新日期：2020-12-23

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