TY - JOUR

T1 - Synthesis and Magnetic and Optical Properties of Novel Fe@ZSM-5 Composites

AU - Зверева, Ирина Алексеевна

AU - Кириченко, Сергей Олегович

AU - Самадов, Азамат Рахимжон Угли

AU - Курносенко, Сергей Алексеевич

AU - Земцова, Елена Георгиевна

AU - Шеляпина, Марина Германовна

AU - Панкратов, Денис Александрович

AU - Кудымов, Владимир Константинович

AU - Петрановский, В.П.

PY - 2025/12/25

Y1 - 2025/12/25

N2 - Alkaline treatment in 0.2 and 0.4 M NaOH solutions successfully generated controlledmesoporosity into ZSM-5 (Zeolite Socony Mobil-5) zeolite, resulting in average mesoporediameters of approximately 15 and 25 nm, respectively, while preserving the crystallinestructure of the zeolite framework. Parent ZSM-5 and its mesoporous derivatives obtainedby desilication were used to prepare (Fe species)@(zeolite matrix) composites. The synthesiswas carried out by co-precipitating Fe2+/Fe3+ ions onto both parent and desilicated ZSM-5matrices under oxygen-free conditions. Comprehensive characterization by X-ray diffraction,scanning electron microscopy, N2 adsorption, vibrating-sample magnetometry, 57FeMössbauer spectroscopy, and diffuse reflectance UV–Vis spectroscopy revealed that thedegree of introduced mesoporosity dramatically influences the size, dispersion, phase composition,and oxidation state of the iron-containing nanospecies. On purely microporousZSM-5, relatively large (~15 nm) partially oxidized magnetite nanoparticles are formed predominantlyon the external surface, exhibiting superparamagnetism at room temperature(Ms = 11 emu/g) and a band gap of 2.12 eV. Increasing mesoporosity leads to progressivelysmaller and more highly dispersed iron(III) oxo/hydroxo clusters with significantlylower blocking temperatures and reduced magnetization (down to 0.7 emu/g for Fe@ZSM-5_0.4). All composites display strong visible-light absorption confirming their potential asmagnetically separable visible-light-driven photocatalysts for environmental remediation.

AB - Alkaline treatment in 0.2 and 0.4 M NaOH solutions successfully generated controlledmesoporosity into ZSM-5 (Zeolite Socony Mobil-5) zeolite, resulting in average mesoporediameters of approximately 15 and 25 nm, respectively, while preserving the crystallinestructure of the zeolite framework. Parent ZSM-5 and its mesoporous derivatives obtainedby desilication were used to prepare (Fe species)@(zeolite matrix) composites. The synthesiswas carried out by co-precipitating Fe2+/Fe3+ ions onto both parent and desilicated ZSM-5matrices under oxygen-free conditions. Comprehensive characterization by X-ray diffraction,scanning electron microscopy, N2 adsorption, vibrating-sample magnetometry, 57FeMössbauer spectroscopy, and diffuse reflectance UV–Vis spectroscopy revealed that thedegree of introduced mesoporosity dramatically influences the size, dispersion, phase composition,and oxidation state of the iron-containing nanospecies. On purely microporousZSM-5, relatively large (~15 nm) partially oxidized magnetite nanoparticles are formed predominantlyon the external surface, exhibiting superparamagnetism at room temperature(Ms = 11 emu/g) and a band gap of 2.12 eV. Increasing mesoporosity leads to progressivelysmaller and more highly dispersed iron(III) oxo/hydroxo clusters with significantlylower blocking temperatures and reduced magnetization (down to 0.7 emu/g for Fe@ZSM-5_0.4). All composites display strong visible-light absorption confirming their potential asmagnetically separable visible-light-driven photocatalysts for environmental remediation.

KW - mesoporosity

KW - magnetite

KW - zeolite

KW - vibrating-sample magnetometry

KW - ZSM-5

KW - Mössbauer spectroscopy

KW - composite

KW - UV-Vis spectroscopy

U2 - 10.3390/molecules31010089

DO - 10.3390/molecules31010089

M3 - Article

VL - 31

SP - 1

EP - 20

JO - Molecules

JF - Molecules

SN - 1420-3049

IS - 89

M1 - 31010089

ER -