Ermakova Ludmila, Kuznetsova Anastasiia, Girsova Marina, Volkova Anna, Antropova Tatiana
Institute of Chemistry, Saint Petersburg State University, Saint Petersburg 199034, Russia.
Laboratory of the Physical Chemistry of Glass, Grebenshikov Institute of Silicate Chemistry of the Russian Academy of Sciences, Saint Petersburg 199034, Russia.
Membranes (Basel). 2023 Jan 19;13(2):126. doi: 10.3390/membranes13020126.
Silver/silver halide materials are considered as efficient and highly stable plasmonic photocatalysts for the organic pollutant degradation and hydrogen evolution from water splitting under solar irradiation, and they possess promising antibacterial activity. Ordered mesoporous silica materials including porous glasses are considered as the most promising template for silver-containing structures. In the present work, Ag/AgHal-doped (Hal = Cl, Br) vitreous membranes on a base of the mesoporous glasses were prepared via step-by-step single-stage impregnation procedure. The chemical and phase composition of the modified membranes were identified by the X-ray photoelectron spectroscopy, the X-ray diffraction and the energy-dispersive X-ray spectroscopy. The structure and morphology of inner membrane space were studied by the scanning electron microscopy. Electrokinetic properties of the silver-containing vitreous membranes were determined by the differential method and the streaming potential method. The inner membrane space is modified unevenly with appearance of the clearly defined regions with different silver content. The formation of the Ag/AgCl clusters along with the individual nanoparticles over thickness of the 1-mm membrane with mean pore radius of 23 nm was detected. The modification of the pore space by Ag-containing structures and the type of halogen ion almost do not affect the electrochemical behavior of the mesoporous vitreous membranes.
银/卤化银材料被认为是高效且高度稳定的等离子体光催化剂，可用于在太阳辐射下分解水中的有机污染物并产生氢气，并且它们具有良好的抗菌活性。包括多孔玻璃在内的有序介孔二氧化硅材料被认为是含银结构最有前景的模板。在本工作中，通过逐步单步浸渍法制备了基于介孔玻璃的Ag/AgHal掺杂（Hal = Cl，Br）玻璃膜。通过X射线光电子能谱、X射线衍射和能量色散X射线光谱对改性膜的化学和相组成进行了鉴定。通过扫描电子显微镜研究了内膜空间的结构和形态。采用微分法和流动电位法测定了含银玻璃膜的电动性质。内膜空间的改性不均匀，出现了银含量不同的清晰区域。在平均孔径为23 nm的1 mm厚的膜中，检测到沿膜厚度方向形成了Ag/AgCl簇以及单个纳米颗粒。含银结构对孔隙空间的改性以及卤素离子的类型几乎不影响介孔玻璃膜的电化学行为。
