Franco Ana, Luque Rafael, Carrillo-Carrión Carolina
Departamento de Química Orgánica, Campus de Rabanales, Universidad de Córdoba, Ed. Marie Curie, Ctra. Nnal. IV-A, Km 396, E14014 Córdoba, Spain.
Nanomaterials (Basel). 2021 May 11;11(5):1259. doi: 10.3390/nano11051259.
Biomass-derived materials are put forward as eco-friendly alternatives to design heterogeneous catalysts. To contribute in this field, we explored the potential of mesoporous biogenic silica (RH-Silica) obtained from lignocellulosic waste, in particular from rice husk, as an inorganic support to prepare heterogenized iron oxide-based catalysts. Mechanochemistry, considered as a green and sustainable technique, was employed to synthetize iron oxide nanoparticles in pure hematite phase onto the biosilica (α-FeO/RH-Silica), making this material a good candidate to perform catalyzed organic reactions. The obtained material was characterized by different techniques, and its catalytic activity was tested in the selective oxidation of styrene under microwave irradiation. α-FeO/RH-Silica displayed a good catalytic performance, achieving a conversion of 45% under optimized conditions, and more importantly, with a total selectivity to benzaldehyde. Furthermore, a good reusability was achieved without decreasing its activity after multiple catalytic cycles. This work represents a good example of using sustainable approaches and green materials as alternatives to conventional methods in the production of high-added value products.
生物质衍生材料被提出作为设计多相催化剂的环保替代品。为了在这一领域做出贡献，我们探索了从木质纤维素废料（特别是稻壳）中获得的介孔生物源二氧化硅（RH-二氧化硅）作为无机载体来制备异质化氧化铁基催化剂的潜力。机械化学作为一种绿色可持续技术，用于在生物二氧化硅上合成纯赤铁矿相的氧化铁纳米颗粒（α-FeO/RH-二氧化硅），使该材料成为进行催化有机反应的良好候选材料。通过不同技术对所得材料进行了表征，并在微波辐射下测试了其在苯乙烯选择性氧化中的催化活性。α-FeO/RH-二氧化硅表现出良好的催化性能，在优化条件下转化率达到45%，更重要的是，对苯甲醛具有总选择性。此外，该材料具有良好的可重复使用性，在多次催化循环后活性不降低。这项工作是在高附加值产品生产中使用可持续方法和绿色材料替代传统方法的一个很好的例子。
