4.6 Article

Design of Metal-Organic Polymers MIL-53(M3+): Preparation and Characterization of MIL-53(Fe) and Graphene Oxide Composite

期刊

CRYSTALS
卷 11, 期 11, 页码 -

出版社

MDPI
DOI: 10.3390/cryst11111281

关键词

metal-organic framework; MIL-53; crystal structure; photo-Fenton; reactive red 195 dye

资金

  1. Ministry of Science and Higher Education of the Russian Federation [0706-2020-0026]

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This article presents a crystal chemical analysis, generalization, and systematization of structural characteristics of metal-organic polymers MIL-53(M3+). The study divided the MIL-53(M3+) structures into a morphotropic series, predicting the formation of new compounds or solid solutions. Experimental data confirmed the different coordination numbers and formal charges of iron ions in MIL-53(Fe) and MIL-53(Fe3+)/GO, explaining the higher photocatalytic activity of the latter in photo-Fenton reactions.
This article presents a crystal chemical analysis, generalization, and systematization of structural characteristics of metal-organic polymers MIL-53(M3+) with M = Al, Cr, Ga, and Fe. The division of the MIL-53(M3+) structures into a morphotropic series was performed, which made it possible to predict the formation of new compounds or solid solutions with the corresponding composition and structure. The change in the symmetry of MIL-53(M3+) and the causes of polymorphs formation are explained on the basis of crystal chemical rules. The efficiency of the revealed regularities in the structural characteristics of the MIL-53(M3+) phases were experimentally confirmed for MIL-53(Fe) and composite MIL-53(Fe)/GO (GO-graphene oxide) by several methods (powder X-ray, X-ray absorption, and photoelectron spectroscopy). For the first time, different coordination numbers (CN) (CNFe = 4.9 for MIL-53(Fe)-two types of coordination polyhedra with CNFe = 6 and CNFe = 4; CNFe = 4 for MIL-53 (Fe3+)/GO) and the formal charges (FC) of iron ions (variable FC of Fe ((2+delta)+) in MIL-53(Fe3+) and Fe2+ in MIL-53(Fe3+)/GO) were found. These experimental data explain the higher photocatalytic activity of MIL-53(Fe3+)/GO in photo-Fenton reactions-RR195 decomposition.

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