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核壳纳米复合材料作为光催化剂用于降解水污染物孔雀石绿和罗丹明 B。

"Core/Shell" Nanocomposites as Photocatalysts for the Degradation of the Water Pollutants Malachite Green and Rhodamine B.

机构信息

Faculty of Chemistry and Pharmacy, Sofia University "St. Kliment Ohridski", 1, J. Bourchier, 1164 Sofia, Bulgaria.

Faculty of Physics, Sofia University "St. Kliment Ohridski", 5a, J. Bourchier, 1164 Sofia, Bulgaria.

出版信息

Int J Mol Sci. 2024 Jun 19;25(12):6755. doi: 10.3390/ijms25126755.

DOI:10.3390/ijms25126755
PMID:38928461
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11203973/
Abstract

"Core/shell" composites are based on a ferrite core coated by two layers with different properties, one of them is an isolator, SiO, and the other is a semiconductor, TiO. These composites are attracting interest because of their structure, photocatalytic activity, and magnetic properties. Nanocomposites of the "core/shell" МFeO/SiO/TiO (М = Zn(II), Co(II)) type are synthesized with a core of MFeO produced by two different methods, namely the sol-gel method (SG) using propylene oxide as a gelling agent and the hydrothermal method (HT). SiO and TiO layer coating is performed by means of tetraethylorthosilicate, TEOS, Ti(IV) tetrabutoxide, and Ti(OBu), respectively. A combination of different experimental techniques is required to prove the structure and phase composition, such as XRD, UV-Vis, TEM with EDS, photoluminescence, and XPS. By Rietveld analysis of the XRD data unit cell parameters, the crystallite size and weight fraction of the polymorphs anatase and rutile of the shell TiO and of the ferrite core are determined. The magnetic properties of the samples, and their activity for the photodegradation of the synthetic industrial dyes Malachite Green and Rhodamine B are measured in model water solutions under UV light irradiation and simulated solar irradiation. The influence of the water matrix on the photocatalytic activity is determined using artificial seawater in addition to ultrapure water. The rate constants of the photocatalytic process are obtained along with the reaction mechanism, established using radical scavengers where the role of the radicals is elucidated.

摘要

"核壳"复合材料基于铁氧体核，其表面涂覆有两层具有不同性质的物质，其中之一是绝缘体 SiO，另一种是半导体 TiO。这些复合材料因其结构、光催化活性和磁性而引起了人们的兴趣。通过两种不同的方法，即使用环氧丙烷作为胶凝剂的溶胶-凝胶法（SG）和水热法（HT），制备了具有 MFeO 核的 "核壳"型 МFeO/SiO/TiO（М = Zn（II），Co（II））纳米复合材料。SiO 和 TiO 层的涂覆分别通过正硅酸乙酯（TEOS）、钛（IV）四丁酯和钛酸四丁酯（Ti（OBu））来完成。需要结合不同的实验技术来证明结构和相组成，如 XRD、UV-Vis、TEM 与 EDS、光致发光和 XPS。通过对 XRD 数据的 Rietveld 分析，确定了壳层 TiO 的晶型、锐钛矿和金红石的晶粒尺寸和重量分数以及铁氧体核的晶胞参数。在模型水溶液中，通过紫外光照射和模拟太阳光照射，测量了样品的磁性能及其对合成工业染料孔雀石绿和罗丹明 B 的光降解活性。除了超纯水之外，还使用人工海水来确定水基质对光催化活性的影响。通过使用自由基清除剂获得光催化过程的速率常数，并建立了反应机制，其中阐明了自由基的作用。

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