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BiFeO_(3)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-x)La_(x)Fe_(1-y)Mn_(y)O_(3)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BiFeO_(3)晶体结构、形貌,抑制其电荷载流子的复合。以Bi_(1-x)La_(x)Fe_(1-y)Mn_(y)O_(3)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。
Using citric acid as a chelating agent,BiFeO_(3)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-x)La_(x)Fe_(1-y)Mn_(y)O_(3)crystals.The results indicate that doping with La and Mn elements can significantly alter the crystal structure and morphology of BiFeO_(3),suppressing the recombination of its charge carriers.Using Bi_(1-x)La_(x)Fe_(1-y)Mn_(y)O_(3)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.
作者
李艳美
张佳睿
匡代洪
杨佳东
阿瓦拜克力·肉苏里
LI Yanmei;ZHANG Jiarui;KUANG Daihong;YANG Jiadong;AWABAIKELI Rousuli(College of Resources and Environment,Xinjiang Agricultural University,Urumqi 830052,China;College of Mathematics and Science,Xinjiang Agricultural University,Urumqi 830052,China)
出处
《人工晶体学报》
CAS
北大核心
2024年第10期1798-1808,共11页
Journal of Synthetic Crystals
基金
新疆维吾尔自治区自然科学基金(2022D01A201)。
关键词
铁酸铋
掺杂
光催化
有机染料
溶胶-凝胶法
bismuth ferrite
doping
photocatalysis
organic dye
sol-gel method
