Green and facile sol–gel synthesis of the mesoporous SiO<sub>2</sub>–TiO<sub>2</sub>catalyst by four different activation modes

Pérez, Héctor Acosta; Miranda, René; Saavedra-Leos, María Zenaida; Zárraga, Ramón; Alonso, Pedro; Moctezuma, Edgar; Martínez, Joel

doi:10.1039/d0ra07569h

Cited by 14 publications

(6 citation statements)

References 45 publications

(31 reference statements)

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“…The peak in the region of 445 cm -1 is related to stretching vibrations of Fe 3+ -O 2with tetrahedral spatial arrangement which overlaps with the peaks related to zeolite. Peaks in the region of 738 and 810 cm -1 are assigned to the Ce-O-Si and Fe-O-Si bands [29][30][31]. The broadening of the peak related to zeolite indicates the placement of cerium ions in the structure of the zeolite network.…”

Section: Investigating Photodegradation Of 4-nitrophenol Using Cfdazy...mentioning

confidence: 99%

Optimizing Photocatalytic Efficiency and Durability of Zeolite-Based Catalysts via Cation Doping for Effective Dye Contaminant Removal

Moosavifar,

Akbari,

Nejat-Dehkordi

2024

Preprint

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Decoration of Ce and Fe in the dealuminated Y zeolite (DAZY) framework occurred using the isomorphous substitution method in two steps post-synthesis. At first, Y zeolite was dealuminated by EDTA treatment, creating vacant T sites and silanol groups followed by an exchange of Ce and Fe impregnation of the resultant DAZY zeolite with cerium (IV) sulfate and ferric nitrate in one step due to their solubility of related salts to the formation of Si-O-Ce and Si-O-Fe bonds. For this purpose, we have selected three distinct ratios of metals/zeolite, which are 1:3, 1:10, and 1:20. An important outcome was achieved with a 1:20 ratio of metals to zeolite, providing strong evidence for the superiority of this configuration. The catalyst was characterized using spectroscopic techniques. The photocatalytic activity was investigated in the degradation of para-nitrophenol. To optimize the process, we conducted the effect of various parameters, including reaction time, catalyst amount, temperature, pH, isoelectric point, and 4-NP concentration on the photodegradation process. The optimal conditions for the removal of 4-nitrophenol were obtained in the presence of DAZY decorated with Fe and Ce under ultraviolet radiation, 40 µL of hydrogen peroxide, 0.03 g of photocatalyst, and a concentration of 5×10-4 M 4-nitrophenol during 90 minutes. Studying Hinshelwood's equations showed that the reaction rate was pseudo-first order. Meanwhile, the reaction rate increases with the increase of the initial concentration. The catalyst can be reused up to five times while maintaining its catalytic activity. COD experiments proved the mineralization of dye contamination.

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Section: Investigating Photodegradation Of 4-nitrophenol Using Cfdazy...mentioning

confidence: 99%

Optimizing Photocatalytic Efficiency and Durability of Zeolite-Based Catalysts via Cation Doping for Effective Dye Contaminant Removal

Moosavifar,

Akbari,

Nejat-Dehkordi

2024

Preprint

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“…The observed variance may suggest differences in the amounts of surface hydration or the configurations of hydrogen bonding inside the synthesised silica. [46][47][48][49] The spectral peak observed at a wavenumber of 1630.10 cm À 1 is frequently attributed to bending vibrations, commonly associated with adsorbed water molecules. [47] The observed presence may indicate differences in the moisture content on the surface of the synthesised silica compared to the silica by Sigma Aldrich.…”

Section: Ftir Analysismentioning

confidence: 99%

“…This implies that there may be variations in the hydroxyl content or arrangement of surface hydroxyl groups between the two silica samples. The observed variance may suggest differences in the amounts of surface hydration or the configurations of hydrogen bonding inside the synthesised silica [46–49] …”

Section: Ftir Analysismentioning

confidence: 99%

High‐Purity Template‐Free Mesoporous Silica Synthesized FROM Coal Fly Ash

Manyepedza,

Gaolefufa,

Beas

et al. 2024

ChemistrySelect

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The study demonstrates a new method to create high‐purity mesoporous silica from coal fly ash without using structure‐directing agents. Divided into two stages, the process involves pre‐treating the ash with Na2CO3, calcination, cooling, washing, and drying to yield a dehydrated sample. Subsequently, silica synthesis occurs through an acid refluxing technique using thermally activated coal fly ash with Na2CO3. Key factors impacting synthesis include acid content and liquid‐to‐solid ratio. The study extensively employs various characterization methods like XRF, XRD, FTIR, and BET analysis, revealing a 99.1 % purity in silica content, a surface area of 793.51 m2/g, and a pore size of 3.9 nm. Optimal conditions for this synthesis involve 80 °C temperature, 2‐hour reaction time, 25 % hydrochloric acid concentration, and a 10 : 1 liquid‐to‐solid ratio. FTIR spectra demonstrate similarities between the obtained silica and commercial Sigma Aldrich silica. This innovative approach presents a promising avenue for generating top‐quality silica from coal fly ash, potentially diversifying applications across industries reliant on high‐performance silica materials.

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“…S6 †). 57 The chemical shift, entire individual line width at half height, and the percentage of Q n obtained from 29 Si MAS NMR are summarized in Table S2. † It was found that the proportions of Q 2 , Q 3 , and Q 4 in Ti 0.5 Si 0.5 O 2 were 2.7%, 53.4%, and 43.9%, respectively, demonstrating that Q 2 and Q 3 accounted for a significant amount of the Si-O-Ti bonds.…”

Section: Characterizationmentioning

confidence: 99%

Upcycling of waste polyethylene terephthalate to dimethyl terephthalate over solid acids under mild conditions

Ye¹,

Zhou²,

Zhong³

et al. 2023

Green Chem.

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Green and facile sol–gel synthesis of the mesoporous SiO₂–TiO₂catalyst by four different activation modes

Abstract: The most environmentally friendly protocol for obtaining mesoporous SiO2–TiO2 catalysts has been sought.

Cited by 14 publications

References 45 publications

Optimizing Photocatalytic Efficiency and Durability of Zeolite-Based Catalysts via Cation Doping for Effective Dye Contaminant Removal

Optimizing Photocatalytic Efficiency and Durability of Zeolite-Based Catalysts via Cation Doping for Effective Dye Contaminant Removal

High‐Purity Template‐Free Mesoporous Silica Synthesized FROM Coal Fly Ash

Upcycling of waste polyethylene terephthalate to dimethyl terephthalate over solid acids under mild conditions

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Green and facile sol–gel synthesis of the mesoporous SiO2–TiO2catalyst by four different activation modes

Abstract: The most environmentally friendly protocol for obtaining mesoporous SiO2–TiO2 catalysts has been sought.

Cited by 14 publications

References 45 publications

Optimizing Photocatalytic Efficiency and Durability of Zeolite-Based Catalysts via Cation Doping for Effective Dye Contaminant Removal

Optimizing Photocatalytic Efficiency and Durability of Zeolite-Based Catalysts via Cation Doping for Effective Dye Contaminant Removal

High‐Purity Template‐Free Mesoporous Silica Synthesized FROM Coal Fly Ash

Upcycling of waste polyethylene terephthalate to dimethyl terephthalate over solid acids under mild conditions

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Product

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Green and facile sol–gel synthesis of the mesoporous SiO₂–TiO₂catalyst by four different activation modes