TiO2 photoactivity in vis and UV light: The influence of calcination temperature and surface properties

Górska, Paulina; Zaleska, Adriana; Kowalska, Ewa; Klimczuk, Tomasz; Sobczak, Janusz W.; Skwarek, Ewa; Janusz, W.; Hupka, Jan

doi:10.1016/j.apcatb.2008.04.028

Cited by 180 publications

(103 citation statements)

References 27 publications

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“…Both crystalline structures (anatase and rutile) appear for pure TiO 2 prepared by microemulsion method followed by calcination at 450 ºC. Our previous investigation indicated that hydrolysis of titanium (IV) isopropoxide, followed by drying at 80 ºC and calcination at 350-550 ºC, led to well defined, broad, diffraction peaks corresponding only to the anatase phase [34]. Thus, the microemulsion method affected the crystal structure of obtained TiO 2 -a slight amount of rutile phase appeared for lower calcination temperature.…”

Section: Absorption Propertiesmentioning

confidence: 99%

Silver-doped TiO2 prepared by microemulsion method: Surface properties, bio- and photoactivity

Zielińska

Kowalska

Sobczak

et al. 2010

Separation and Purification Technology

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182

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A series of Ag-TiO 2 photocatalysts were obtained in microemulsion system (water/AOT/cyclohexane), using several Ag precursor amount ranging from 1.5 to 8.5 mol.%. The photocatalysts' characteristics by X-ray diffraction, STEM microscopy, UV-Vis spectroscopy, X-ray photoelectron spectroscopy, BET methods showed that a sample with the highest photo-and bioactivity had anatase structure, about 90 m 2 /g specific surface area, absorbed light for λ>400 nm and contained 1.64 at.% of silver (0.30 at.% of Ag 0 and 1.34 at.% of Ag 2 O) and about 13 at.% of carbon in the surface layer.The photocatalytic activity of the catalysts was estimated by measuring the decomposition rate of phenol in 0.21 mM aqueous solution under visible and ultraviolet light irradiation.The bioactivity of silver-doped titanium dioxide nanocomposites was estimated using

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Section: Absorption Propertiesmentioning

confidence: 99%

Silver-doped TiO2 prepared by microemulsion method: Surface properties, bio- and photoactivity

Zielińska

Kowalska

Sobczak

et al. 2010

Separation and Purification Technology

Self Cite

182

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“…However, the anatase-to-rutile phase transition leads to the collapse of the TiO 2 specific surface area [7], resulting in a decrease in photocatalytic activity [1,[8][9][10][11]. Low specific surface area and therefore low adsorption capacity lead to strong limitations in exploiting the photocatalytic activity of rutile.…”

Section: Introductionmentioning

confidence: 99%

Improvement in the methylene blue adsorption capacity and photocatalytic activity of H2-reduced rutile-TiO2 caused by Ni(II)porphyrin preadsorption

Páez

Lambert

Poelman

et al. 2011

Applied Catalysis B: Environmental

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H 2 -reduced rutile-TiO 2 xerogel (Ti-700), obtained via the sol-gel process, was found to strongly adsorb the Ni(II)-5,10,15,20-tetrakis(4-carboxyphenyl)-porphyrin (NiTCPP) from a methanolic solution, despite its very low specific surface area (S BET  2 m 2 g -1 ).UV/vis spectroscopy analysis showed that after calcination at 700 °C and reduction under H 2 flow at 400 °C, the TiO 2 -xerogel increased its NiTCPP-adsorption capacity by surface area unit by up to 120 times. The effect of the porphyrin presence in the catalytic performances of TiO 2 -xerogels was studied through three kinetics models: (i) the pseudo-first-order kinetic model; (ii) the pseudo-second-order kinetic model, which are used both to describe the adsorption rate based on the adsorption capacity of the catalysts; and (iii) the Langmuir-Hinshelwood kinetic model which is used to describe the photocatalytic degradation rate of methylene blue (MB). A significant improvement in the efficiency of Ti-700 was observed after the porphyrin-adsorption process (NiTCPP/Ti-700): MB-adsorption capacity at equilibrium and the apparent MBphotoconversion constant, k app , of NiTCPP/Ti-700 were both up to 2 times higher than those observed for the Ti-700.

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“…Among 1D TiO 2 nanostructures, TiO 2 nanotubes (TNTs) possess high specific surface area and nanotubular morphology, the nanotubular features of TiO 2 provide a large amount of channels for enhanced electron transfer, which is important during photocatalytic oxidation of organic compounds. It has been reported that anatase TiO 2 nanotubes showed higher photocatalytic activity for degradation of organic compound than anatase TiO 2 nanoparticles [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

CdS nanoparticles decorated anatase TiO 2 nanotubes with enhanced visible light photocatalytic activity

Wang

2015

Separation and Purification Technology

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TiO2 photoactivity in vis and UV light: The influence of calcination temperature and surface properties

Cited by 180 publications

References 27 publications

Silver-doped TiO2 prepared by microemulsion method: Surface properties, bio- and photoactivity

Silver-doped TiO2 prepared by microemulsion method: Surface properties, bio- and photoactivity

Improvement in the methylene blue adsorption capacity and photocatalytic activity of H2-reduced rutile-TiO2 caused by Ni(II)porphyrin preadsorption

CdS nanoparticles decorated anatase TiO 2 nanotubes with enhanced visible light photocatalytic activity

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