Optimised photocatalytic activity of grid-like mesoporous TiO<sub>2</sub>films: effect of crystallinity, pore size distribution, and pore accessibility

Sakatani, Yoshiaki; Grosso, David; Nicole, Lionel; Boissière, Cédric; Soler-Illia, Galo J. A. A.; Sánchez, Clément

doi:10.1039/b512824m

Cited by 263 publications

(259 citation statements)

References 29 publications

Supporting

Mentioning

243

Contrasting

Order By: Relevance

“…[4][5][6][7] Among the various phases of titania reported, anatase shows a better photocatalytic activity and anti-bacterial performance. [8][9][10][11][12] A stable anatase phase up to the sintering temperature of the ceramic substrates is most desirable for applications on antibacterial self cleaning building materials (e.g. bathroom tile, sanitary wares etc).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst

et al. 2007

View full text Add to dashboard Cite

In the absence of a dopant or precursor modification, anatase to rutile transformation in synthetic TiO 2 usually occurs at a temperature of 600 ºC to 700 ºC. Conventionally, metal oxide dopants (e.g. Al 2 O 3 and SiO 2 ) are used to tune the anatase to rutile transformation. A simple methodology is reported here to extend the anatase rutile transformation by employing various concentrations of urea.XRD and Raman spectroscopy were used to characterize various phases formed during thermal treatment. A significantly higher anatase phase (97%) has been obtained at 800 ºC using a 1:1 (Ti (OPr) 4 : urea) composition and 11% anatase composition is retained even after calcining the powder at 900 ºC. On comparison a sample which has been prepared without urea showed that rutile phases started to form at a temperature as low as 600 °C. The effect of smaller amounts of urea such as 1:0.25 and 1:0.5 (Ti (OPr) 4 :urea) has also been studied and compared. The investigation concluded that the stoichiometric modification by urea 1:1 (Ti (OPr) 4 :urea) composition is most effective in extending the anatase to rutile phase transformation by 200 ºC compared to the unmodified samples. In addition, BET analysis carried out on samples calcined at 500 °C showed that the addition of urea up to 1:1 (Ti (OPr) 4 :urea) increased the total pore volume (from 0.108 cm 3 /g to 0.224 cm 3 /g) and average pore diameter (11 nm to 30 nm) compared to the standard sample. Samples prepared using 1:1 (Ti (OPr) 4 :urea) composition calcined at 900 ºC show significantly higher photocatalytic activity compared to the standard sample prepared under similar conditions. Kinetic analysis shows a marked increase in the photocatalytic degradation of rhodamine 6G on going from the standard sample (0.016 min , decoloration in 50 mins).

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst

et al. 2007

View full text Add to dashboard Cite

show abstract

“…Support materials for TiO 2 include, among others, glass (8)(9)(10), quartz (11), paper (12), cement (7); activated carbon fibers (13,14), ceramics (15,16), stainless steel (17) and polymeric matrices such as poly(ethylene terephthalate) (PET) and cellulose acetate (18,19). Similarly, significant research efforts have been made to improve the photocatalytic efficiency of TiO 2 -based nanoparticles through chemical and physical transformations (20)(21)(22)(23)(24)(25). Such changes include doping with transition metal ions (23) and non-metallic elements (24), as well as structural transformations at the nanometric scale such as the synthesis of p-n juncture nanotubes (25).…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Clay−TiO₂ Nanocomposites on the Photocatalytic Elimination of a Model Hydrophobic Air Pollutant

Kibanova

Cervini-Silva

Destaillats

2009

Environ. Sci. Technol.

111

View full text Add to dashboard Cite

Clay-supported TiO 2 photocatalysts can potentially improve the performance of air treatment technologies via enhanced adsorption and reactivity of target volatile organic compounds (VOCs). In this study, a bench-top photocatalytic flow reactor was used to evaluate the efficiency of hectorite-TiO 2 and kaolinite-TiO 2 , two novel composite materials synthesized in our laboratory. Toluene, a model hydrophobic VOC and a common indoor air pollutant, was introduced in the air stream at realistic concentrations, and reacted under UVA (λ max = 365 nm) or UVC (λ max = 254 nm) irradiation. The UVC lamp generated secondary emission at 185 nm, leading to the formation of ozone and other short-lived reactive species. Performance of clay-TiO 2 composites was compared with that of pure TiO 2 (Degussa P25), and with UV irradiation in the absence of photocatalyst under identical conditions. Films of clay-TiO 2 composites and of P25 were prepared by a dip-coating method on the surface of Raschig rings, which were placed inside the flow reactor. An upstream toluene concentration of ~170 ppbv was generated by diluting a constant flow of toluene vapor from a diffusion source with dry air, or with humid air at 10, 33 and 66 % relative humidity (RH). be partially attributed to the contribution of gas phase reactions by short-lived radical species. When the reaction rate was normalized to the light irradiance, T r /I λ , the UV/TiO 2 reaction under UVA irradiation was more efficient for samples with a higher content of TiO 2 (P25 and Hecto-TiO 2 ), but not for Kao-TiO 2 . In all cases, reaction rates

show abstract

“…It includes important design features and manufacturing processes that are vital to a longterm success in the mesoporous solids technology. These materials are capable of opening up inestimable potential applications in optics, magnetics, electronics, mechanics, microdevices and quantum dots (40)(41)(42)(43)(44)(45). From the viewpoint of synthesis, there are two challenging questions for material scientists.…”

Section: Introductionmentioning

confidence: 99%

General Synthesis of Ordered Nonsiliceous Mesoporous Materials

Wan

Yang

Zhao

2008

ACS Symposium Series

View full text Add to dashboard Cite

The design of ordered nonsiliceous mesoporous materials is illustrated based on the surfactant assembly and confinedspace growth. These materials include mesoporous metal oxides, polymers, and carbons with open framework structures, and single-crystal metal, metal oxide and carbon nanoarrays with replicated mesostructures. A generalized "acid-base pair" concept, which self-adjusts the acidity and homogeneity of the inorganic precursor, is proposed to prepare highly ordered mesoporous metal oxides, phosphates and borates, as well as mixed metal oxides and phosphates, with diverse structures. Mesoscopically ordered polymer frameworks with uniformly large pore sizes are derived from the self-assembly from organic templates and organic precursors. Heating these materials transforms them to homologous carbon frameworks. Microwave digested method is an efficient way to enhance the adsorption property of hard silica templates in fabricating ordered nonsiliceous single-crystal nanoarrays. The coordination of organic surfactants with metal ions is also a method to increase the interaction between hard templates and precursors. A one-step impregnation process is used to fabricate ordered silica monoliths with various metal oxide nanocrystals. Improving the interactions between the precursors themselves plays an essential role in replicating ordered mesoporous CdS, SiC and graphitized carbons. Preliminary applications in bone-forming materials, biosensors and electrodes are presented as well.

show abstract

Optimised photocatalytic activity of grid-like mesoporous TiO₂films: effect of crystallinity, pore size distribution, and pore accessibility

Cited by 263 publications

References 29 publications

Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst

Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst

Efficiency of Clay−TiO₂ Nanocomposites on the Photocatalytic Elimination of a Model Hydrophobic Air Pollutant

General Synthesis of Ordered Nonsiliceous Mesoporous Materials

Contact Info

Product

Resources

About

Optimised photocatalytic activity of grid-like mesoporous TiO2films: effect of crystallinity, pore size distribution, and pore accessibility

Cited by 263 publications

References 29 publications

Synthesis of High-Temperature Stable Anatase TiO2 Photocatalyst

Synthesis of High-Temperature Stable Anatase TiO2 Photocatalyst

Efficiency of Clay−TiO2 Nanocomposites on the Photocatalytic Elimination of a Model Hydrophobic Air Pollutant

General Synthesis of Ordered Nonsiliceous Mesoporous Materials

Contact Info

Product

Resources

About

Optimised photocatalytic activity of grid-like mesoporous TiO₂films: effect of crystallinity, pore size distribution, and pore accessibility

Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst

Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst

Efficiency of Clay−TiO₂ Nanocomposites on the Photocatalytic Elimination of a Model Hydrophobic Air Pollutant