FeTi- SBA-15 magnetic nanocomposites with photocatalytic properties

Filip, Mihaela; Petcu, Gabriela; Anghel, Elena Maria; Petrescu, Simona; Trică, Bogdan; Osiceanu, Petre; Stănică, Nicolae; Atkinson, Irina; Munteanu, Cornel; Mureşeanu, Mihaela; Pârvulescu, Viorica

doi:10.1016/j.cattod.2020.08.003

Cited by 18 publications

(27 citation statements)

References 55 publications

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“…A characteristic peak at 622 cm –1 is related to the breathing vibrations of Mn–O–Mn in the MnO 6 octahedral within a tetragonal hollandite-type framework and lattice vibrations of Mn–O in MnO 2 , further confirming the deposition of MnO x clusters on SBA-15 . Moreover, the peak at 973 cm –1 can be attributed to the Si–O–Mn bond, similar to the report that the peak around 1000 cm –1 belongs to the Si–O-transition metal bond . With the increase of the Mn content, the Si–O–Mn bond strengthens gradually and then remains unchanged, indicating that the Si–O–Mn bond in 3.0Mn-PSBA is saturated.…”

Section: Results and Discussionsupporting

confidence: 84%

“…Moreover, EDX mapping images (Figure e–h) confirm that MnO x clusters are supported on SBA-15 and evenly distributed in 3.0Mn-PSBA. N 2 adsorption–desorption isotherms in Figure S2a confirm the mesoporous structure of x Mn-PSBA, in line with that of SBA-15 . Especially, the hysteresis loop closing of x Mn-PSBA moves to a lower relative pressure (0.59/0.51/0.48) than that of SBA-15 (0.63), which suggests that MnO x clusters deposited on SBA-15 could lead to smaller mesopores …”

Section: Results and Discussionsupporting

confidence: 71%

“…N 2 adsorption−desorption isotherms in Figure S2a confirm the mesoporous structure of xMn-PSBA, in line with that of SBA-15. 23 Especially, the hysteresis loop closing of xMn-PSBA moves to a lower relative pressure (0.59/ 0.51/0.48) than that of SBA-15 (0.63), which suggests that MnO x clusters deposited on SBA-15 could lead to smaller mesopores. 13 The XRD patterns of SBA-15 and xMn-PSBA are shown in Figure 2a,b.…”

Section: Resultsmentioning

confidence: 92%

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Enhanced Catalytic Ozonation for Eliminating CH₃SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Liu

Huang

et al. 2022

Environ. Sci. Technol.

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Catalytic ozonation of methyl mercaptan (CH3SH) can effectively control this unbearable odorous sulfur-containing volatile organic compound (S-VOC). The construction of an electronic metal–support interaction (EMSI) coordination structure to maximize the number of active sites and increase the intrinsic activity of active sites is an effective means to improve catalytic performance. In this work, the abundant Si–OH groups on PSBA-15 (SBA-15 before calcination) were used to anchor Mn to form a Si–O–Mn-based EMSI coordination structure. Detailed characterizations and theoretical simulations reveal that the strong EMSI effect significantly adjusts and stabilizes the electronic structure of Mn 3d states, resulting in an electron-rich center on the Si–O–Mn bond to promote the specific adsorption/activation of ozone (O3) and an electron-poor center on the (Si–O−)Mn–O bond to adsorb a large amount of CH3SH accompanied by its own oxidative degradation. In situ Raman and in situ Fourier transform infrared (FTIR) analyses identify that catalytic ozonation over 3.0Mn-PSBA generates atomic oxygen species (AOS/*O) and reactive oxygen species (ROS/•O2 –) to achieve efficient decomposition of CH3SH into CO2/SO4 2–. Furthermore, the electrons obtained from CH3SH in electron-poor centers are transferred to maintain the redox cycle of Mn2+/3+ → Mn4+ → Mn2+/3+ through the internal bond bridge, thus accomplishing the efficient and stable degradation of CH3SH prolonged to 180 min. Therefore, the rational design of catalysts with abundant active sites and optimized inherent activity via the EMSI effect can provide significant potential to improve catalytic performance and eliminate odorous gases.

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Section: Results and Discussionsupporting

confidence: 84%

Section: Results and Discussionsupporting

confidence: 71%

Section: Resultsmentioning

confidence: 92%

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Enhanced Catalytic Ozonation for Eliminating CH₃SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Liu

Huang

et al. 2022

Environ. Sci. Technol.

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“…Ti-SBA-15 samples were obtained by direct-synthesis and post-synthesis methods. 24 The bimetallic photocatalysts EuTi-SBA-15 and PrTi-SBA-15 were obtained by impregnation of lanthanide precursors (Eu(NO 3 ) 3 and Pr(NO 3 ) 3 , respectively) on Ti-SBA-15 supports. The materials were obtained with the same concentrations of europium / praseodymium.…”

Section: Preparation Of Ti-sba-15 and Eu/prti-sba-15 Photocatalystsmentioning

confidence: 99%

Ti-SBA-15 mesoporous photocatalysts modified with lanthanides for degradation of dyes in aqueous solution

Negoescu¹,

Culiţă²,

Atkinson³

et al. 2021

Rev.Roum.Chim.

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New bimetallic LnTi-SBA-15 (where Ln is Eu or Pr) photocatalysts were obtained by immobilization of the lanthanide ions on Ti-SBA-15 supports synthesized by direct- and post-synthesis methods. The obtained materials were characterized by X-ray diffraction, SEM microscopy, N2 adsorption-desorption and UV-Vis spectroscopy. The obtained results evidenced an insignificant effect of Eu and Pr on support ordered mesoporous structure and optical properties of titania dispersed species. The activity of these photocatalysts was evaluated in the photocatalytic degradation, under UV light (254 nm), of Brilliant blue FCF from aqueous solutions. A higher activity was obtained for samples with lower loading of lanthanide. The best results were obtained for samples with lowest Eu oxide loading (2.5%).

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“…The porous and superporous semiconductive superparamagnetic IONPs are nowadays intensively studied for obtaining new functional composite nanostructured materials, such as multifunctional nano-adsorbents, nano-photocatalysts [ 11 ], and biomimetic and nanostructured catalytic membranes [ 20 , 21 ]. The maghemite (γ-Fe 2 O 3 ), considered as fully oxidized magnetite, is an n-type semiconductor with a band gap energy of 2.0 eV and is a visible (Vis) domain active catalyst.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Core-Shell Iron Oxides-Based Nanophotocatalysts and Nanoadsorbents for Multifunctional Thin Films

et al. 2022

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In recent years, iron oxides-based nanostructured composite materials are of particular interest for the preparation of multifunctional thin films and membranes to be used in sustainable magnetic field adsorption and photocatalysis processes, intelligent coatings, and packing or bio-medical applications. In this paper, superparamagnetic iron oxide (core)-silica (shell) nanoparticles suitable for thin films and membrane functionalization were obtained by co-precipitation and ultrasonic-assisted sol-gel methods. The comparative/combined effect of the magnetic core co-precipitation temperature (80 and 95 °C) and ZnO-doping of the silica shell on the photocatalytic and nano-sorption properties of the resulted composite nanoparticles were investigated by ultraviolet-visible (UV-VIS) spectroscopy monitoring the discoloration of methylene blue (MB) solution under ultraviolet (UV) irradiation and darkness, respectively. The morphology, structure, textural, and magnetic parameters of the investigated powders were evidenced by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, Brunauer–Emmett–Teller (BET) measurements, and saturation magnetization (vibrating sample magnetometry, VSM). The intraparticle diffusion model controlled the MB adsorption. The pseudo- and second-order kinetics described the MB photodegradation. When using SiO2-shell functionalized nanoparticles, the adsorption and photodegradation constant rates are three–four times higher than for using starting core iron oxide nanoparticles. The obtained magnetic nanoparticles (MNPs) were tested for films deposition.

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FeTi- SBA-15 magnetic nanocomposites with photocatalytic properties

Cited by 18 publications

References 55 publications

Enhanced Catalytic Ozonation for Eliminating CH₃SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Enhanced Catalytic Ozonation for Eliminating CH₃SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Ti-SBA-15 mesoporous photocatalysts modified with lanthanides for degradation of dyes in aqueous solution

Magnetic Core-Shell Iron Oxides-Based Nanophotocatalysts and Nanoadsorbents for Multifunctional Thin Films

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FeTi- SBA-15 magnetic nanocomposites with photocatalytic properties

Cited by 18 publications

References 55 publications

Enhanced Catalytic Ozonation for Eliminating CH3SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Enhanced Catalytic Ozonation for Eliminating CH3SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Ti-SBA-15 mesoporous photocatalysts modified with lanthanides for degradation of dyes in aqueous solution

Magnetic Core-Shell Iron Oxides-Based Nanophotocatalysts and Nanoadsorbents for Multifunctional Thin Films

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Product

Resources

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Enhanced Catalytic Ozonation for Eliminating CH₃SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading

Enhanced Catalytic Ozonation for Eliminating CH₃SH via Stable and Circular Electronic Metal–Support Interactions of Si–O–Mn Bonds with Low Mn Loading