Maltoni P, Ghibaudo N, Kumar A, Barucca G, Vocciante M, Locardi F, Varvaro G, Slimani S, Ferretti M, Sarkar T, Reverberi A, Alberti S, Peddis D
Department of Chemistry and Industrial Chemistry & INSTM RU, University of Genoa Via Dodecaneso 31 16146 Genova (GE) Italy
Institute of Structure of Matter (ISM), National Research Council (CNR), nM2-Lab Via Salaria km 29.300, Monterotondo Scalo Roma 00015 Italy.
Nanoscale Adv. 2025 Aug 26. doi: 10.1039/d5na00646e.
Bismuth ferrite (BiFeO), a perovskite oxide with both ferroelectric and antiferromagnetic properties, has emerged as a promising material for environmental cleanup due to its piezo-photocatalytic activity. The material's ability to degrade organic pollutants, such as azo dyes, under both light irradiation and mechanical stress (ultrasonic waves) offers a dual-action mechanism for efficient wastewater treatment. In this work, we explore the synthesis of BiFeO nanoparticles a simple sol-gel method, followed by characterization of their structural, magnetic, and photocatalytic properties. Under ultrasonic treatment, BiFeO generates piezoelectric potentials that enhance electron-hole separation, promoting photocatalytic degradation of methylene blue. The combination of photocatalysis and piezocatalysis improves catalytic efficiency while reducing energy consumption compared to traditional UV-based photocatalysis. Additionally, coupling BiFeO with cobalt ferrite (CoFeO) creates a magnetically recoverable system, facilitating efficient catalyst separation from treated water, and modifying the kinetic process of photodissociation. The magnetic recovery was improved through the development of a tailored magnetic support system, designed to optimize the spatial magnetic field gradient. These findings highlight the potential of BiFeO-based nanosystems for sustainable, energy-efficient, and eco-friendly solutions to water pollution, addressing both dye degradation and the need for effective water remediation techniques.
铋铁氧体（BiFeO）是一种兼具铁电和反铁磁特性的钙钛矿氧化物，由于其压电光催化活性，已成为一种有前景的环境净化材料。该材料在光照和机械应力（超声波）作用下能够降解有机污染物，如偶氮染料，为高效废水处理提供了一种双重作用机制。在这项工作中，我们探索了通过简单的溶胶 - 凝胶法合成铋铁氧体纳米颗粒，随后对其结构、磁性和光催化性能进行了表征。在超声处理下，铋铁氧体产生压电电位，增强电子 - 空穴分离，促进亚甲基蓝的光催化降解。与传统的基于紫外线的光催化相比，光催化和压电催化的结合提高了催化效率，同时降低了能耗。此外，将铋铁氧体与钴铁氧体（CoFeO）耦合创建了一个可磁回收的系统，便于从处理后的水中高效分离催化剂，并改变光解离的动力学过程。通过开发定制的磁性支撑系统来优化空间磁场梯度，提高了磁回收效率。这些发现突出了基于铋铁氧体的纳米系统在解决水污染问题方面的潜力，为可持续、节能和环保的水污染解决方案提供了可能，既解决了染料降解问题，又满足了有效水修复技术的需求。
