Tuning piezoelectric driven photocatalysis by La-doped magnetic BiFeO3-based multiferroics for water purification
Tuning piezoelectric driven photocatalysis by La-doped magnetic BiFeO3-based multiferroics for water purification
复制标题
通过 La 掺杂磁性 BiFeO3 基多铁材料调节压电驱动光催化用于水净化
DOI：
10.1016/j.nanoen.2021.106792
复制
发表时间：
2021-12-06
期刊：
影响因子：
17.6
通讯作者：
Zhu, Mingshan
中科院分区：
文献类型：
--
作者：
Lan, Shenyu;Yu, Chuan;Zhu, Mingshan
多铁性材料因其具有良好的多效应耦合特性和环境应用前景而受到人们的广泛关注。本论文以镧掺杂铁酸铋（BiFeO 3）为基础，制备了具有强磁响应和高压电光催化活性的多铁性材料（La-BFOs）。在太阳光和机械振动作用下，分散在废水中的La-BFO在30 min内对卡马西平（CBZ）的降解率达到94.5%，反应常数是光催化和压电催化之和的2.2倍。这种协同增强作用归因于La-BFO的内部压电场调整了能带结构，促进了光生载流子的分离，产生了更多的活性物种用于污染物的去除。该催化剂的饱和磁化强度为6.6emu/g，具有良好的可回收性，可从反应液中磁分离出来，连续10次循环试验，CBZ的去除率可达90%以上。本研究开辟了通过利用自然界中的绿色能源将催化剂的磁性、压电和光激发功能结合在水净化中的前景，为实现可持续和经济的环境提供了科学和技术上的重要性。
Multiferroic materials have attracted increasing attention for developing multi-effect coupling between different physical properties and exploring the possibility of environmental application. In this work, La doped bismuth ferrite (BiFeO3)-based multiferroics (La-BFOs) were synthesized to achieve strong magnetic response and high piezo-photocatalytic activity. When applying solar light and mechanical vibration on La-BFOs dispersing in the wastewater, 94.5% of carbamazepine (CBZ) was piezo-photocatalytically degraded in 30 min, and the reaction constant was 2.2 times of the sum of photocatalysis and piezocatalysis. This synergistic enhancement was ascribed to that the internal piezoelectric field of La-BFOs tailored the structure of energy band and boosted the separation of photo-generated carriers to produce more reactive species for pollutants removal. The saturation magnetization value of 6.6 emu/g endowed catalysts with an excellent recyclability that can be magnetically separated from the reaction solution, and a satisfactory catalytic reproducibility that more than 90% of CBZ can be removed in ten times of consecutive cycling tests. The present study opens the perspective of combining magnetic, piezoelectric and photoexcitation functionalities of catalyst in water purification through utilizing green energies in the nature, delivering a scientific and technological importance to achieve a sustainable and economic environment.