Bi1-xLaxFe1-yMnyO3的制备及光催化性能研究

摘要/Abstract

摘要： 以柠檬酸作螯合剂,通过超声波结合溶胶-凝胶法合成了A位单掺La、B位单掺Mn及La/Mn共掺BiFeO₃纳米粉体。利用X射线衍射(XRD)、紫外-可见漫反射测试(UV-DRS)、X射线光电子能谱(XPS)、比表面及孔径分析(BET)、光致发光光谱(PL)表征技术分析Bi_1-xLa_xFe_1-yMn_yO₃晶体的形貌、结构和元素组成等。结果表明,掺杂La、Mn元素可明显改变BiFeO₃晶体结构、形貌,抑制其电荷载流子的复合。以Bi_1-xLaxFe_1-yMn_yO₃为光催化剂,探究了pH值、光源对光催化降解模拟污染物的影响,并进一步进行了光催化机理探究实验。研究发现,La、Mn共掺样品对刚果红(CR)和亚甲基蓝(MB)的降解率差别显著,这与染料分子的电负性有关。同时,掺杂增强了样品的磁性,有利于回收并提高其使用效率。

关键词: 铁酸铋, 掺杂, 光催化, 有机染料, 溶胶-凝胶法

Abstract: Using citric acid as a chelating agent, BiFeO₃ nanopowders doped with La at the A-site, Mn at the B-site, and co-doped with La/Mn were synthesized through an ultrasonic-assisted sol-gel method. Characterization techniques such as X-ray diffraction (XRD), ultraviolet visible diffuse reflectance spectroscopy (UV-DRS), X-ray photoelectron spectroscopy (XPS), specific surface area and pore size analysis (BET), and photoluminescence spectroscopy (PL) were employed to analyze the morphology, structure and elemental composition of Bi_1-xLa_xFe_1-yMn_yO₃ crystals. The results indicate that doping with La and Mn elements can significantly alter the crystal structure and morphology of BiFeO₃, suppressing the recombination of its charge carriers. Using Bi_1-xLa_xFe_1-yMn_yO₃ as a photocatalyst, the effects of pH value and light source on the photocatalytic degradation of simulated pollutants were investigated, and further experiments to explore the photocatalytic mechanism were conducted. The results reveal that La/Mn co-doped samples show significant differences in degradation rates for congo red (CR) and methylene blue (MB), which is related to the electronegativity of the dye molecules. Meanwhile, doping enhances the magnetic properties of the samples, which is beneficial for recycling and improving its utilization efficiency.

Key words: bismuth ferrite, doping, photocatalysis, organic dye, sol-gel method

中图分类号:

X52
O644.1

李艳美, 张佳睿, 匡代洪, 杨佳东, 阿瓦拜克力·肉苏里. Bi_1-xLa_xFe_1-yMn_yO₃的制备及光催化性能研究[J]. 人工晶体学报, 2024, 53(10): 1798-1808.

LI Yanmei, ZHANG Jiarui, KUANG Daihong, YANG Jiadong, AWABAIKELI Rousuli. Preparation and Photocatalytic Performance of Bi_1-xLa_xFe_1-yMn_yO₃[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(10): 1798-1808.

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Bi_1-xLa_xFe_1-yMn_yO₃的制备及光催化性能研究

Preparation and Photocatalytic Performance of Bi_1-xLa_xFe_1-yMn_yO₃

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