Institute of Physical Chemistry "Ilie Murgulescu" of the Romanian Academy, 202 Splaiul Independentei st., 060021 Bucharest, Romania.
J Nanosci Nanotechnol. 2020 Feb 1;20(2):1158-1169. doi: 10.1166/jnn.2020.16981.
The Ti/hierarchical zeolites Y were obtained by direct and post synthesis methods and loaded with Fe(III) by ion-exchange and impregnation resulting Fe-Ti/hierarchical zeolites Y photocatalysts. The synthesized materials were characterized by XRD, SEM microscopy, N2 physical adsorption, Raman, UV-Vis and XPS and EPR spectroscopy. XRD patterns evidenced the crystalline structure of the zeolite Y in all materials, excepting the samples with higher Fe content. The presence of anatase was evidenced by XRD and Raman spectroscopy in the samples obtained by impregnation while -Fe₂O₃ was depicted in the Raman spectra of the samples with Ti and lower Fe loading. SEM images and N2 adsorption-desorption isotherms confirmed the formation of mesopores together with microporous crystals of zeolite Y. The UV-Vis spectra proved a red-shifted adsorption band for samples with iron. In all these samples XPS shows Fe as oxide on the surface and EPR Fe in tetrahedral coordination. Different variables such as hierarchical structure, amount of iron, catalyst loading, concentration of pollutant solution, pH value were studied to estimate their effects on performances of photocatalysts in degradation of amoxicillin from aqueous solution in UV and Visible light. A higher adsorption capacity and degradation efficiency of amoxicillin (100%) was noticed for hierarchical materials, especially for higher iron oxide loaded samples.
采用直接法和后合成法制备 Ti/层状 Y 沸石，并通过离子交换和浸渍将其负载 Fe(III)，得到 Fe-Ti/层状 Y 沸石光催化剂。采用 XRD、SEM 显微镜、N2 物理吸附、Raman、UV-Vis 和 XPS 及 EPR 光谱对合成材料进行了表征。XRD 图谱表明，除了铁含量较高的样品外，所有样品均具有沸石 Y 的结晶结构。XRD 和 Raman 光谱表明，浸渍法得到的样品中存在锐钛矿，而 Raman 光谱则表明 Ti 和较低铁负载的样品中存在 -Fe₂O₃。SEM 图像和 N2 吸附-脱附等温线证实了介孔与沸石 Y 微晶体的形成。UV-Vis 光谱证明了含铁样品的吸附带红移。在所有这些样品中，XPS 均显示表面的 Fe 为氧化物，EPR 则显示 Fe 处于四面体配位。研究了不同变量，如分级结构、铁的含量、催化剂负载量、污染物溶液浓度、pH 值等，以评估它们对光催化剂在紫外光和可见光下降解阿莫西林水溶液性能的影响。分层材料具有更高的阿莫西林吸附能力和降解效率（100%），特别是负载更高氧化铁的样品。
