Comparative study of textural, structural and catalytic properties of xerogels and aerogels CeO2–TiO2 mixed oxides

Hammedi, Tijani; Triki, M.; Ksibi, Zouhaier; Ghorbel, Abdelhamid; Medina, Françesc

doi:10.1007/s10934-015-9967-z

Cited by 8 publications

(12 citation statements)

References 37 publications

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“…The Fourier Transform Infrared spectra (FTIR) of the entire series of the materials are displayed in Figure a. The hybrid materials showed a typical signal between 600 and 400 cm −1 which could be assigned to the Ti–O–Ti stretching mode in anatase morphology . For BBT, the characteristic signals at around 1570, 1480, and 2300 cm −1 which could be assigned respectively to the NS, the CN of the BT unit of the polymeric network and the CC stretching modes .…”

Section: Resultssupporting

confidence: 80%

“…The TiO 2 nanoparticles with average size of ≈10 nm ( Figure S1a,b, Supporting Information) were synthesized according to the method reported in the literature. [24] They were obtained in pure anatase phase as shown by the X-ray diffraction pattern ( Figure S1c, Supporting Information). The series of the hybrid photocatalysts consisting of the CMPs with immobilized TiO 2 nanoparticles were obtained via the direct polymerization of 1,3,5-triethynylbenzene (B) as crosslinker and 4,7-dibromo-2,1,3-benzothiadiazole (BT) as comonomer using the palladium-catalyzed Sonogashira crosscoupling reactions in a dispersion of TiO 2 nanoparticles (Scheme 1).…”

Section: Resultsmentioning

confidence: 98%

“…The TiO 2 nanoparticles with average size of ≈10 nm (Figure S1a,b, Supporting Information) were synthesized according to the method reported in the literature . They were obtained in pure anatase phase as shown by the X‐ray diffraction pattern (Figure S1c, Supporting Information).…”

Section: Resultsmentioning

confidence: 98%

“…The hybrid materials showed a typical signal between 600 and 400 cm −1 which could be assigned to the Ti-O-Ti stretching mode in anatase morphology. [24,25] For BBT, the characteristic signals at around 1570, 1480, and 2300 cm −1 which could be assigned respectively to the NS, the CN of the BT unit of the polymeric network and the CC stretching modes. [26] A clear tendency can be observed that the typical signal of TiO 2 decreased while increasing the BBT amount.…”

Section: Resultsmentioning

confidence: 99%

“…Then, a homogeneous gel was obtained after the addition of HNO 3 (0.1 m) which corresponded to the H 2 O/Ti molar ratio = 10 according to the previous work. [24] The obtained gel was dried in an autoclave under supercritical conditions of isopropanol (T = 235 °C, P = 48 bar) to obtain an aerogel. Finally, the solid was calcined under oxygen at 500 °C for 3 h.…”

Section: Methodsmentioning

confidence: 99%

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Conjugated Microporous Polymers with Immobilized TiO₂ Nanoparticles for Enhanced Visible Light Photocatalysis

Ayed

Huang

et al. 2017

Part & Part Syst Charact

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transition metal complexes have been developed due to their easy access, and promising photoredox properties. They have been widely used in a large range of applications from water splitting, solar energy storage, to photovoltaics and organic redox transformation reactions. [2] Nevertheless, there are still intrinsic drawbacks associated with these rather homogeneous metal complex systems, for example, high cost, toxicity of the rare metals, and limited availability in nature. From this standpoint, transition metalfree photocatalysts with light-absorbing properties have attracted much attention recently. Indeed, the class of organic dyes such as fluorescein, eosin Y, nile red, or rhodamine B have been successfully employed in photoredox catalysis in the last decades. [3] However, a common disadvantage of the organic dyes as molecular catalysts is, similar to the transition metal complexes, that they easily suffer from the solvolytic attack during the reaction cycle. The so-called photobleaching effect can be troublesome for catalyst recycling and long-term usage. It is therefore necessary to design new transition metal-free, stable, and heterogeneous photocatalysts with stability and easy separation and recovery.Traditional metal oxides semiconductors, especially those containing abundant metals are inexpensive, environmentally friendly heterogeneous photocatalysts. [4] Among them, titanium dioxide (TiO 2 ) has been intensely investigated and applied as photocatalyst in a wide range of applications owning to its low cost, high photo-and chemical stability, large availability, biological inertia, etc. However, the fact that TiO 2 can only be activated under UV light (below 380 nm) caused by its wide energy band gap (3.2 eV). This limits its exploitation under the full range of the sunlight. To note, the visible range accounts about 44% of the total solar energy, while the UV light only being about 4%. [5] Different strategies have been developed to improve the sunlight utilization efficiency and the photocatalytic activity of TiO 2 . Several studies have reported such as doping TiO 2 with other metals as Cu, Co, Ni, Cr, Mn, Fe, Ru, Au, Ag, Pt, etc., [6] or with nonmetal such as C, S, F, and I, [7] or co-doping with two different elements. [8] However, these methods still have certain drawbacks such as the thermal instability and the high cost of the dopants. [9] Recently, organic dye-sensitized TiO 2 -based materials have also been investigated and used as photocatalyst for organic photoredox reactions due to their absorption range in the visible area of the solar spectrum and enhanced electronic properties. [10] Nevertheless, the usually weak bonds between TiO 2The search for heterogeneous, visible light-active, transition metal-free, stable, and reusable photocatalysts for organic photoredox reactions remains a challenge for the chemists. Here, this study reports on a series of hybrid photocatalysts consisting of conjugated microporous polymer-based organic semiconductors with immobilized TiO 2 nanoparticles...

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Conjugated Microporous Polymers with Immobilized TiO₂ Nanoparticles for Enhanced Visible Light Photocatalysis

Ayed

Huang

et al. 2017

Part & Part Syst Charact

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Effect of the variation of metal and cerium loadings on CeO2x–TiO2(100−x) supports in the complete catalytic oxidation of formaldehyde

Bensouilah¹,

Olivet²,

Hammedi³

et al. 2020

Res Chem Intermed

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Study of the catalytic wet air oxidation of p-hydroxybenzoic acid on a fresh ruthenium catalyst supported by different oxides

Hammedi,

Bensouilah,

Ouakouak

et al. 2023

Heliyon

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Comparative study of textural, structural and catalytic properties of xerogels and aerogels CeO2–TiO2 mixed oxides

Cited by 8 publications

References 37 publications

Conjugated Microporous Polymers with Immobilized TiO₂ Nanoparticles for Enhanced Visible Light Photocatalysis

Conjugated Microporous Polymers with Immobilized TiO₂ Nanoparticles for Enhanced Visible Light Photocatalysis

Effect of the variation of metal and cerium loadings on CeO2x–TiO2(100−x) supports in the complete catalytic oxidation of formaldehyde

Study of the catalytic wet air oxidation of p-hydroxybenzoic acid on a fresh ruthenium catalyst supported by different oxides

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Comparative study of textural, structural and catalytic properties of xerogels and aerogels CeO2–TiO2 mixed oxides

Cited by 8 publications

References 37 publications

Conjugated Microporous Polymers with Immobilized TiO2 Nanoparticles for Enhanced Visible Light Photocatalysis

Conjugated Microporous Polymers with Immobilized TiO2 Nanoparticles for Enhanced Visible Light Photocatalysis

Effect of the variation of metal and cerium loadings on CeO2x–TiO2(100−x) supports in the complete catalytic oxidation of formaldehyde

Study of the catalytic wet air oxidation of p-hydroxybenzoic acid on a fresh ruthenium catalyst supported by different oxides

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Conjugated Microporous Polymers with Immobilized TiO₂ Nanoparticles for Enhanced Visible Light Photocatalysis

Conjugated Microporous Polymers with Immobilized TiO₂ Nanoparticles for Enhanced Visible Light Photocatalysis