TY - JOUR

T1 - Effect of Mesoporosity on Structural, Textural, and Optical Characteristics of Fe(III) Ion-Exchanged ZSM-5 Zeolites

AU - Зверева, Ирина Алексеевна

AU - Самадов, Азамат Рахимжон Угли

AU - Кириченко, Сергей Олегович

AU - Курносенко, Сергей Алексеевич

AU - Шеляпина, Марина Германовна

AU - Петрановский, В.П.

PY - 2025/12/22

Y1 - 2025/12/22

N2 - This study investigates the influence of mesoporosity, pre-created by alkali etching inZSM-5 zeolite, on the characteristics of Fe3+ ion-exchange and subsequent changes in itstextural and optical properties. It is shown that the formed hierarchical porosity facilitatesthe penetration of hydrated iron complexes into the internal channels. This not onlyincreases the degree of exchange, but also leads to the formation of multinuclear FexOyclusters and, possibly, to the partial isomorphic replacement of Al3+ with Fe3+ in the framework.Comprehensive characterization of mesoporous samples (XRD, SEM, N2 adsorption,UV-Vis) confirms the preservation of the microporous crystal structure of MFI on the onehand, and demonstrates a significant change in the distribution of iron-containing speciesin mesoporous matrices on the other. The introduction of Fe ions significantly reducesthe bandgap energy, shifting the absorption edge into the visible range. The results obtaineddemonstrate that preliminary mesostructuring is an effective approach for creatinghierarchically porous Fe zeolites with great potential for photocatalytic applications.

AB - This study investigates the influence of mesoporosity, pre-created by alkali etching inZSM-5 zeolite, on the characteristics of Fe3+ ion-exchange and subsequent changes in itstextural and optical properties. It is shown that the formed hierarchical porosity facilitatesthe penetration of hydrated iron complexes into the internal channels. This not onlyincreases the degree of exchange, but also leads to the formation of multinuclear FexOyclusters and, possibly, to the partial isomorphic replacement of Al3+ with Fe3+ in the framework.Comprehensive characterization of mesoporous samples (XRD, SEM, N2 adsorption,UV-Vis) confirms the preservation of the microporous crystal structure of MFI on the onehand, and demonstrates a significant change in the distribution of iron-containing speciesin mesoporous matrices on the other. The introduction of Fe ions significantly reducesthe bandgap energy, shifting the absorption edge into the visible range. The results obtaineddemonstrate that preliminary mesostructuring is an effective approach for creatinghierarchically porous Fe zeolites with great potential for photocatalytic applications.

KW - zeolite

KW - mesoporosity

KW - bandgap energy

KW - MFI

KW - Fe(III) ion-exchange

KW - alkaline etching

UR - https://www.scopus.com/pages/publications/105027208006

U2 - 10.3390/molecules31010023

DO - 10.3390/molecules31010023

M3 - Article

VL - 31

JO - Molecules

JF - Molecules

SN - 1420-3049

IS - 1

M1 - 23

ER -