Template-free synthesis and photocatalytic activity of hierarchical porous titania with controlled texture and crystalline structure

Xia, Kaisheng; Ferguson, Dean; Djaoued, Yahia; Robichaud, Jacques; Tchoukanova, Nadéjda; Brüning, Ralf; McCalla, Eric

doi:10.1016/j.apcata.2010.08.041

Cited by 27 publications

(14 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observation of the hysteresis loop of type H2 is the signature of the occurrence of a percolation process in disordered porous materials [26], and is consistent with the pore size distribution plot (figure S1 available at stacks.iop.org/Nano/ 23/294010/mmedia) without any peaks on the BJH desorption branch. It was also reported that H2 hysteresis loops indicate the presence of pores with narrow mouths (ink-bottle pores) [27][28][29]. This confirms the earlier conclusion, based on TEM images, that the pore architecture is mainly a cellular foam-like structure without regular porosity.…”

Section: Resultssupporting

confidence: 86%

Nanoscale gold intercalated into mesoporous silica as a highly active and robust catalyst

Wang¹,

Chen²,

Shang³

et al. 2012

Nanotechnology

View full text Add to dashboard Cite

Stable gold/mesoporous silica nanocomposites (with Au nanoparticles intercalated in the walls of mesoporous silica) were successfully synthesized by the hydrothermal method and applied as catalysts. A challenging issue associated with intercalation and the use of coordinating agents is the effect of the coordinating agent on the mesoporous silica structure and periodicity. This investigation is targeted at elaborating the effect of the coordinating agent on the resulting mesoporous structure. The amount of Au coordinating agent bis[3-(triethoxysilyl)propyl]-tetrasulfide (TESPTS) was systematically altered to synthesize a range of materials with varying Au loadings and morphologies. These materials were characterized by N(2) adsorption-desorption, x-ray diffraction, transmission electron microscopy and UV-visible spectroscopy. The structures of the catalysts were found to range from mesoporous to vesical- and foam-like upon varying the TESPTS/polymer template (P123) ratio. Additionally, the sizes of Au nanoparticles increased by increasing the amount of TESPTS. The catalytic properties of the resulting materials were examined using oxidation of benzyl alcohol and reduction of 4-nitrophenol as probe reactions. The intercalated systems demonstrated high activity and more importantly were robust and readily reusable. This approach to imparting stability to nanoscale materials may be much more broadly applicable and expand the types of environments in which they can be utilized.

show abstract

Section: Resultssupporting

confidence: 86%

Nanoscale gold intercalated into mesoporous silica as a highly active and robust catalyst

Wang¹,

Chen²,

Shang³

et al. 2012

Nanotechnology

View full text Add to dashboard Cite

show abstract

“…Accordingly, the amount of non-hydrolyzed alkyl groups remaining in the precursor solution decreased and instigated particles to be at closer proximity to each other, subsequently leading to agglomeration of particles. The lower the content of non-hydrolyzed alkyl groups remaining in the precursor, the better the crystallization of TiO2 and the larger the crystallite size [26]. The degree of lattice distortion in all doped samples is higher than that in TO, indicating the incorporation of the doping atoms in the lattice structure of TiO2.…”

Section: Structural Propertiesmentioning

confidence: 91%

“…As shown in Fig. 3(a), all samples exhibit type IV isotherms with type H2 hysteresis loops (based on IUPAC classification) in the relative pressure range of 0.45-0.95, indicating that the samples contain mesopores with narrow pores (ink-bottle pores) [26,27]. These mesopores mainly correspond to voids formed as a result of the primary aggregation of nanosheets [28].…”

Section: Structural Propertiesmentioning

confidence: 99%

Pr, N, and P tri-doped anatase TiO2 nanosheets with enhanced photocatalytic activity under sunlight

姜洪泉

王巧凤

李世洋

et al. 2014

Chinese Journal of Catalysis

View full text Add to dashboard Cite

Pr, N, and P tri-doped anatase TiO2 nanosheets (PrNPTO) were synthesized by a combined sol-gel solvothermal method and characterized by X-ray diffraction, transmission electron microscopy, N2 adsorption-desorption, X-ray photoelectron spectroscopy, UV-vis absorbance spectroscopy, and photoluminescence spectroscopy. When the Pr-doping concentration was 1.75 wt% and calcination temperature employed was 550 °C, the resulting PrNPTO showed the highest photoactivity towards the degradation of methylene blue under visible and UV light irradiation. PrNPTO also displayed superior photoactivity towards the degradation of 4-chlorophenol under sunlight (kapp = 3.90 × 10-2 min-1) over the non-doped, single-doped, and co-doped samples, and P25 TiO2 (kapp = 1.17 × 10-2 min-1). The high photoactivity of PrNPTO was attributed to the increased UV and visible light absorption properties, reduced recombination of photogenerated carriers, increased surface hydroxyl content, and improved surface textural properties. PrNPTO was highly efficient and stable under simulated sunlight irradiation, which are essential attributes for practical application in environment-related remediation schemes.

show abstract

“…It is interesting to note that the volume of mesoporosity (between 2 and 10 nm) decreased as the calcination temperature increased. This phenomenon also leads to a reduction in the surface area [44], as shown in Table 2, due to the higher porosity permitting more nitrogen gas being adsorbed on the catalyst surface, which resulted in a larger surface area. The decrease in the mesoporosity volume indicated the formation of mesopores due to the collapse of micropores, which resulted in a lower surface area.…”

Section: Catalysts Characterizationmentioning

confidence: 94%

Synthesis and characterization of zinc oxide/maghemite nanocomposites: Influence of heat treatment on photocatalytic degradation of 2,4-dichlorophenoxyacetic acid

Lee

Abdullah

2015

Materials Science in Semiconductor Processing

View full text Add to dashboard Cite

Template-free synthesis and photocatalytic activity of hierarchical porous titania with controlled texture and crystalline structure

Cited by 27 publications

References 27 publications

Nanoscale gold intercalated into mesoporous silica as a highly active and robust catalyst

Nanoscale gold intercalated into mesoporous silica as a highly active and robust catalyst

Pr, N, and P tri-doped anatase TiO2 nanosheets with enhanced photocatalytic activity under sunlight

Synthesis and characterization of zinc oxide/maghemite nanocomposites: Influence of heat treatment on photocatalytic degradation of 2,4-dichlorophenoxyacetic acid

Contact Info

Product

Resources

About