Vázquez-Vélez Edna, Martínez Horacio, Castillo Fermín
Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México. Av. Universidad 1000, Col. Chamilpa, 62210 Cuernvaca, Morelos, Mexico.
Nanomaterials (Basel). 2021 Nov 12;11(11):3044. doi: 10.3390/nano11113044.
Magnetic iron oxide nanoparticles (MIONPs) were synthesized using tannic acid and characterized by Raman, FTIR, UV, and DRX spectroscopy. In a heterogeneous Fenton-like reaction, the catalytic peroxidase-like activity of MIONPs in the degradation of Acid Red 1 (AR 1) dye was investigated. TEM/STEM was used to determine the quasi-spherical morphology and particle size (3.2 nm) of the synthesized MIONPs. The XRD powder patterns were indexed according to the reverse spinel structure of magnetite, and SEM-EDS analysis confirmed their chemical composition. At pH = 3.5, the decomposition of HO in hydroxyl radicals by MIONPs results in high AR 1 degradation (99%). This behavior was attributed to the size and surface properties of the MIONPs. Finally, the Surface Enhanced Raman Spectroscopy (SERS) technique detected intermediary compounds in the degradation process.
使用单宁酸合成了磁性氧化铁纳米颗粒（MIONPs），并通过拉曼光谱、傅里叶变换红外光谱、紫外光谱和X射线衍射光谱对其进行了表征。在非均相类芬顿反应中，研究了MIONPs在降解酸性红1（AR 1）染料中的催化过氧化物酶样活性。使用透射电子显微镜/扫描透射电子显微镜（TEM/STEM）确定合成的MIONPs的准球形形态和粒径（3.2纳米）。根据磁铁矿的反尖晶石结构对X射线衍射粉末图谱进行了索引，扫描电子显微镜-能谱分析（SEM-EDS）证实了它们的化学成分。在pH = 3.5时，MIONPs将过氧化氢分解为羟基自由基，导致AR 1的高降解率（99%）。这种行为归因于MIONPs的尺寸和表面性质。最后，表面增强拉曼光谱（SERS）技术检测到了降解过程中的中间化合物。
