Photocatalytic study of polymorphic titania synthesized by ambient condition sol process

Nolph, Christopher A.; Sievers, Daniel E.; Kaewgun, Sujaree; Kucera, Courtney; Mckinney, Daniel; Rientjes, John P.; White, Jamie; Bhave, Radhika; Lee, Burtrand I.

doi:10.1007/s10562-007-9134-5

Cited by 18 publications

(16 citation statements)

References 18 publications

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“…Mixed TiO 2 powders with brookite as the predominant phase were obtained in ambient conditions by hydrolysis of TiCl 4 in an acidic water-isopropanol medium [54,174]. The phase composition was tuned by varying the water-isopropanol ratio.…”

Section: Mixtures Of Brookite With Anatase And/or Rutilementioning

confidence: 99%

Brookite, the Least Known TiO2 Photocatalyst

2013

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Abstract:Brookite is the least studied TiO 2 photocatalyst due to the difficulties usually encountered in order to obtain it as a pure phase. In this review, a comprehensive survey of the different methods available for preparing brookite powders and films is reported. Attention has been paid both to the most traditional methods, such as hydrothermal processes at high temperatures and pressures, and to environmentally benign syntheses using water soluble compounds and water as the solvent. Papers reporting the photocatalytic activity of pure and brookite-based samples have been reviewed.

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Section: Mixtures Of Brookite With Anatase And/or Rutilementioning

confidence: 99%

Brookite, the Least Known TiO2 Photocatalyst

2013

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“…The increase of treatment temperature up to 400 and 500°C not only reduces the surface area, but also changes the phase and inset of (c) shows FT-IR spectra using ATR of the prepared titania samples composition, increasing rutile while sacrificing brookite and anatase. The lower surface area, elimination of nitrogen, and higher rutile content [9,23] caused a reduction of photocatalytic activities. According to our CHNS analysis results, the more nitrogen presents in TiO 2 , the higher the photocatalytic activity under both UV and VL exposure.…”

Section: Resultsmentioning

confidence: 99%

“…The WACS process, titanium tetrachloride (TiCl 4 -Reagent grade obtained from Aldrich Chemical) in a 1:2 ratio of water-isopropanol solution with 0.3 M hydrochloric acid under refluxing conditions at 83°C for 15 h [7][8][9], was used to prepare polymorphic TiO 2 . A posttreatment to the WACS process, called SACS [16][17][18], was carried out in N-methylpyrrolidone (NMP) at 170°C for 4 h in a sealed Teflon container.…”

Section: Methodsmentioning

confidence: 99%

“…Not many studies exist on brookite TiO 2 due to the difficult preparation of single phase brookite TiO 2 . A few publications from this group [7][8][9] reported a water-based ambient condition sol (WACS) for producing predominantly brookite titania. Degussa Aeroxide TiO 2 P25 (P25) [10], consisting of 79% anatase 21% rutile, is an excellent photocatalyst under UV light.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Photocatalytic Activity of Polymorphic Titania Nanoparticles by NMP Solvent-based Ambient Condition Process

2008

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Solvent-based ambient condition sol (SACS) process with N-methylpyrrolidone (NMP) as the solvent, is a post-treatment technique utilized to modify polymorphic titania nanoparticles prepared by a water-based ambient condition sol process. All samples were characterized by X-ray diffraction, N 2 physisorption, CHNS analysis, UVvis absorption spectrophotometry, FT-IR, and TEM and compared to a commercial reference titania product, Degussa P25. Photocatalytic activity, evaluated by the degradation of methyl orange under ultraviolet (UV) and visible light (VL), showed that SACS, with NMP as the solvent, is a powerful treatment to enhance TiO 2 photocatalytic activity by minimizing lattice hydroxyls and doping titania samples with nitrogen.

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“…(Addamo et al, 2005). Research on titanium oxide has focused on stabilizing the tetragonal-anatase phase in this oxide due to its excellent catalytic properties (Nolph et al, 2007;Pedraza et al, 2009). Together with this, the control of morphological properties is also essential for material reactivity (Yuan et al, 2002;Addamo et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and physicochemical characterization of titanium oxide and sulfated titanium oxide obtained by thermal hydrolysis of titanium tetrachloride

Benito

Sánchez

García-Alamilla

et al. 2014

Braz. J. Chem. Eng.

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-This work reports the synthesis of titanium oxide (TiO 2 ) and sulfated titanium oxide (TiO 2 -SO 4 2-) obtained by thermal hydrolysis of titanium tetrachloride. Titanium hydroxide synthesized by this method was impregnated with a 1 N H 2 SO 4 solution, to give amounts of sulfate ions (SO 4 2-) of 3 and 7 wt%. The synthesized samples were dried at 120 °C during 24 h and then calcined for 3 h at 400 °C. Thermal analyses, X-ray diffraction, nitrogen physisorption, infrared spectroscopy, potentiometric titration with n-butylamine, U.V.-visible diffuse reflectance spectroscopy and scanning electron microscopy were used to characterize the materials. The results of physicochemical characterization revealed that a mixture of crystalline structures, anatase, brookite and rutile developed in the titanium oxide, stabilizing the anatase structure in the sulfated titanium oxides, and coexisting with a small amount of brookite structure. The synthesized mesoporous materials developed specific surface areas between 62 and 70 m 2 g -1, without detecting an important influence of sulfation on this parameter. The presence of sulfate ions improved the acidity of titanium oxide and modified the characteristics of light absorption in the 425-600 nm region, which suggests the possibility of using these materials in reactions assisted by visible light.

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Photocatalytic study of polymorphic titania synthesized by ambient condition sol process

Cited by 18 publications

References 18 publications

Brookite, the Least Known TiO2 Photocatalyst

Brookite, the Least Known TiO2 Photocatalyst

Enhancing Photocatalytic Activity of Polymorphic Titania Nanoparticles by NMP Solvent-based Ambient Condition Process

Synthesis and physicochemical characterization of titanium oxide and sulfated titanium oxide obtained by thermal hydrolysis of titanium tetrachloride

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