铁酸镧纳米材料的制备及其压电催化性能研究

Investigation on Synthesis and Piezoelectric Catalytic Performance of Lanthanum Ferrite Nanomaterials

随着印染行业的发展,大量染料废水被排放到水环境中,造成了水体污染、生态环境破坏等问题。染料废水具有很强的抗氧化性、抗生化性,导致用普通的方法难以处理。研究发现压电催化技术可以充分利用振动能实现低能耗、高效率去除染料污染物。本论文采用共沉淀法制备了铁酸镧(LaFeO3)压电纳米材料,利用其压电效应与电化学之间的耦合实现了甲基橙染料的降解。经过180分钟的超声振动激励,LaFeO3可以降解98.15%的甲基橙染料。通过添加自由基抑制剂后发现LaFeO3压电催化性能主要受•O2-和•OH的影响。LaFeO3纳米材料在压电催化降解染料废水方面具有潜在的应用前景。

With the development of printing and dyeing industry, a large number of dye wastewater is discharged into the water environment, resulting in water pollution, ecological environment damage and other problems. Dye wastewater has strong antioxidant and biochemical resistance, which makes it difficult to treat through traditional methods. It is found that piezoelectric catalytic technology can make full use of ultrasonic vibration energy to remove dye pollutants with low energy consumption and high efficiency. In this paper, lanthanum ferrite (LaFeO3) nanomaterial is prepared via coprecipitation method and used as the catalyst to decompose methyl orange dye solution through the coupling of piezoelectric effect and electrochemistry. The piezoelectric catalytic decomposition ratio of methyl orange dye can reach 98.15% after 180 min of ultrasonic vibration. By adding free radical scavengers, it is found that the piezoelectric catalytic performance of LaFeO3 is mainly affected by •O2- and •OH. LaFeO3 nanomaterial shows the potential application in piezocatalytically decomposing dye wastewater.