Photocatalytic degradation of Rhodamine 6G on mesoporous titania films: Combined effect of texture and dye aggregation forms

Ghazzal, Mohamed Nawfal; Kebaili, Hakima; Joseph, Mélissa; Debecker, Damien P.; Eloy, Pierre; Coninck, J. De; Gaigneaux, Éric M.

doi:10.1016/j.apcatb.2011.12.016

Cited by 53 publications

(34 citation statements)

References 30 publications

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“…the physical state and the organization of adsorbed molecules trapped in the confined spaces of porous photoactive materials, especially in coatings, as related to the photodegradation rates and kinetics [23][24][25][26]. Dye molecules can be adsorbed on the semiconductor surface as monomers or as their aggregated forms [28].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…[1][2][3][4][5][6][7] In many studies dyes are used as model materials in photocatalytic measurements [8][9][10][11], as they are easily detected by optical spectroscopic methods; furthermore, dyesemiconductor systems have practical importance in the fields of dye-sensitized solar cells (DSSCs) [4,12], and waste water treatment in the textile industry where dyes are major pollutants [13][14][15]. Most studies measure the absorbance decrease of dye solutions containing photoactive materials under ultraviolet (UV) or visible light [9,[16][17][18][19][20][21], and only a fraction of the literature describes measurements on the air-solid interface, which can provide a simple model system and can be especially important for self-cleaning coatings [22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Photoinduced processes of adsorbed and associated dye molecules in mesoporous titania coatings

et al. 2019

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Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photoinduced processes of adsorbed and associated dye molecules in mesoporous titania coatings

et al. 2019

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“…5a). 45,46 XPS spectra of the target metal oxides are presented in Fig.5 be. In the case of bismuth oxide coupled with L-TiO2-1, symmetric peaks of Bi4f state are observed.…”

Section: Resultsmentioning

confidence: 99%

Sol-Gel Biotemplating Route with Cellulose Nanocrystals to Design Photocatalyst Boosting the Hydrogen Generation

wand¹,

Li²,

Paineau³

et al. 2020

Preprint

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<div> Light harvesting capability and charge carriers lifetime play critical roles in determining the photoefficency of photocatalyst. Herein, a one-pot method is proposed to design mesostructured TiO2 materials by taking advantage of the ability of cellulose nanocrystals (CNC) to self-assemble into chiral nematic structures during solvent evaporation. After the xerogel formation, the as-obtained CNC/TiO2 hybrid films exhibit a chiral nematic structure and tunable Bragg peak reflection, generating lamellar TiO2 mesostructure after the biotemplate removal by calcination. More prominently, this straightforward method can be extended to couple TiO2 with other metal oxides, improving the light-harvesting and charge carriers separation of these photocatalysts, in particular for boosting hydrogen generation. This foolproof approach opens new doors for the development of nanostructured materials for solar energy conversion and catalysis. </div>

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“…Photocatalysis is attracting more and more attention owing to its environmentally friendly approach toward the conversion of light energy into chemical energy and under mild reaction environments. Photocatalysis is considered as a promising solution to energy shortage or environmental issues and has been successfully applied in a wide range of applications, ranging from hydrogen production [1][2][3] to pollutants elimination [4][5][6] or for CO 2 reduction [7,8].…”

Section: Introductionmentioning

confidence: 99%

Photonic titanium dioxide film obtained from hard template with chiral nematic structure for environmental application

Paineau

Brisset

et al. 2019

Catalysis Today

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In the present work, mesoporous TiO 2 with a photonic structure was elaborated using cellulose nanocrystals (CNCs) as a biotemplate by two-step hard template methods. This strategy enables to replicate the chiral nematic (CN) structure of the photonic films (biotemplate) in TiO 2 films. A series of iridescent CNCs films with different weight ratios of silica/CNCs composite photonic films were prepared via evaporation induced self-assembly (EISA) method. The films showed iridescent color and tuneable Bragg reflection wavelengths by solely changing the ratio between the silica and the CNCs biotemplate. Polarized optical microscopy (POM) performed on hydride SiO 2 /CNCs films showed a birefringence and typical fingerprint of chiral nematic structure. This birefringence was also observed for TiO 2 films obtained using SiO 2 films as a hard template, which suggested the transfer of the chiral nematic structure in TiO 2 materials. Afterwards, their optical, morphological and electronic properties were studied by scanning electron microscope (SEM), POM, energy-dispersive X-ray spectroscope (EDX) and time resolved microwave conductivity (TRMC). The photocatalytic activities were evaluated by following the phenol degradation using high performance liquid chromatography (HPLC). The results showed that the structuration of the TiO 2 film using a chiral nematic SiO 2 film as hard template enhances the photocatalytic performance compared to non-structured mesoporous TiO 2 .

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Photocatalytic degradation of Rhodamine 6G on mesoporous titania films: Combined effect of texture and dye aggregation forms

Cited by 53 publications

References 30 publications

Photoinduced processes of adsorbed and associated dye molecules in mesoporous titania coatings

Photoinduced processes of adsorbed and associated dye molecules in mesoporous titania coatings

Sol-Gel Biotemplating Route with Cellulose Nanocrystals to Design Photocatalyst Boosting the Hydrogen Generation

Photonic titanium dioxide film obtained from hard template with chiral nematic structure for environmental application

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