Bentonite clay modified with Nb2O5: An efficient and reused photocatalyst for the degradation of reactive textile dye

Lacerda, Elenice Hass Caetano; Monteiro, Francielli Casanova; Kloss, Juliana Regina; Fujiwara, Sérgio Toshio

doi:10.1016/j.jphotochem.2019.112084

Cited by 40 publications

(5 citation statements)

References 63 publications

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“…Figure 4a shows the results of the FTIR analysis for the fibers calcined at a heating rate of 1 • C min −1 . Only the highest temperature of 600 • C indicated the presence of pure Nb 2 O 5 bands located at 872 cm −1 referring to bonds (Nb=O) and in 613 cm −1 associated with the bonds (Nb-O-Nb) [34,35]. The PVA polymeric matrix presented vibration bonds located in positions at 3314 cm −1 and 3332 cm −1 (O-H), 2917 cm −1 (C=O), 1500 cm −1 (C-H), 1000 cm −1 (C-O), and around 800 cm −1 (C-C) [36].…”

Section: Optimization Of the Nb 2 O 5 Ceramic Fibersmentioning

confidence: 99%

Preparation and Application of Nb2O5 Nanofibers in CO2 Photoconversion

et al. 2021

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Increasing global warming due to NOx, CO2, and CH4, is significantly harming ecosystems and life worldwide. One promising methodology is converting pollutants into valuable chemicals via photocatalytic processes (by reusable photocatalysts). In this context, the present work aimed to produce a Nb2O5 photocatalyst nanofiber system by electrospinning to convert CO2. Based on the collected data, the calcination at 600 ∘C for 2 h resulted in the best condition to obtain nanofibers with homogeneous surfaces and an average diameter of 84 nm. As a result, the Nb2O5 nanofibers converted CO2 mostly into CO and CH4, reaching values around 8.5 μmol g−1 and 0.55 μmol g−1, respectively.

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Section: Optimization Of the Nb 2 O 5 Ceramic Fibersmentioning

confidence: 99%

Preparation and Application of Nb2O5 Nanofibers in CO2 Photoconversion

et al. 2021

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“…The 27 Al NMR-MAS spectra of pristine MMT and Fe@MMT are illustrated in Figure . The peak at 0 ppm corresponds to the Al atoms in the octahedral sites (AlO 6 ) . This peak also indicates the isomorphic substitution of silicon atoms in the tetrahedral sheets, which could introduce structural variability to alter the catalyst’s properties and reactivity [31].…”

Section: Resultsmentioning

confidence: 99%

“…The peak at 0 ppm corresponds to the Al atoms in the octahedral sites (AlO 6 ). 34 This peak also indicates the isomorphic substitution of silicon atoms in the tetrahedral sheets, which could introduce structural variability to alter the catalyst's properties and reactivity [31]. The three peaks ranging from 50 to 70 ppm originate from the Al atoms tetrahedrally coordinated to oxygen (AlO 4 ) in distinct environments.…”

Section: Acs Applied Energy Materialsmentioning

confidence: 99%

Activating Montmorillonite for Light-Driven Hydrogen Evolution with the Coupling of Fe Species

Zhang,

Wang,

Tao

et al. 2024

ACS Appl. Energy Mater.

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Montmorillonite (MMT), a layered hydrated aluminum silicate mineral, emerges as a promising catalyst support due to its substantial specific surface, ion storage capacity, thermal stability, and cost-effectiveness. Despite the success of MMT-based photocatalysts in degrading compounds, their potential for the photocatalytic hydrogen evolution reaction (HER) is underexplored. Furthermore, the reliance on noble metals and dye sensitization in MMT-based photocatalysts leads to elevated costs. This study introduces an MMT-based photocatalyst modified with Fe species (denoted as Fe@MMT) for photocatalytic HER without the reliance on noble metals and dye sensitization. The incorporation of Fe species has a dual impact, expanding the light harvesting region of MMT and modulating the aluminum-silicate framework. Simultaneously, it facilitates the exfoliation of individual sheets from stacked MMT layers, generating abundant active sites and inner electronic fields that can promote the separation of photoexcited electrons and enhance the photon-to-electron conversion. In comparison to pristine MMT, Fe@MMT exhibits a 43% reduction in the charge transfer resistance in the dark and a 52% reduction under illumination. Additionally, the majority carrier density within the space charge region increased by 33%. Due to these advantages, the photocatalytic HER efficiency over Fe@MMT was improved, approximately 2.9 times that of pristine MMT.

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“…Apart from this, it possesses both Lewis and Bronsted acidity, [56,62,63] thus it was explored as a heterogeneous catalyst in organic synthesis [62] . The other unique properties made it a favorable support for immobilization of metals nanoparticles, [57,59,64] metal oxides, [65,66] metal salts [56,60,63,67] and other modification of bentonite for various application [68–76] . Bentonite is widely distributed in the Kachchh region of India and mainly sodium and calcium bentonite are found in this area.…”

Section: Introductionmentioning

confidence: 99%

Fe(III)/Bentonite as a Heterogeneous Catalyst for the Synthesis of 3,4‐dihydropyrimidin‐2‐(1H)‐ones

Chopda

Dave

2020

ChemistrySelect

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Fe(III) immobilized over natural bentonite (bent) using the impregnation method. Prepared catalysts were well characterized by XRD, FT-IR and FeSEM. The catalytic activity of three catalysts 10, 20 and 30 % Fe(III)/bent evaluated for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones known as Biginelli reaction. The catalyst 30 % Fe(III)/bent exhibited a high yield of the product towards the synthesis of a variety of dihydropyrimidones (DHPMs). The high yield of dihydropyrimidone (DHPM) was obtained in model reaction in ethanol, acetonitrile, DMF and solvent-free condition. The reusability test indicated that 6 % of yield of product decreased after 5 th cycle. Highlights * 10, 20 and 30 % Fe(III) were supported over bentonite clay. The catalysts are well characterized by (XRD), FT-IR, FeSEM and EDS. All charactization method showed that Fe supported over bentonite. * The used catalysts were screened for Biginelli reaction for synthesis dihydropyrimidones. * 30 % Fe(III)/bent exhibited high yield of product towards model Biginelli reaction between benzaldehyde, ethylacetoacetate and urea in ethanol. * 30 % Fe(III)/bent exhibited high yield of product in CH 3 CN, DMF and solvent free-condition. * The catalyst 30 % Fe(III)/bent applied for synthesis of variety of dihydropyrimodone in good yield in CH 3 CN. * Reusability studies show that no great decline in activity after 5 th cycle.

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Bentonite clay modified with Nb2O5: An efficient and reused photocatalyst for the degradation of reactive textile dye

Cited by 40 publications

References 63 publications

Preparation and Application of Nb2O5 Nanofibers in CO2 Photoconversion

Preparation and Application of Nb2O5 Nanofibers in CO2 Photoconversion

Activating Montmorillonite for Light-Driven Hydrogen Evolution with the Coupling of Fe Species

Fe(III)/Bentonite as a Heterogeneous Catalyst for the Synthesis of 3,4‐dihydropyrimidin‐2‐(1H)‐ones

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