Characterisation of iron/titanium oxide photocatalysts. Part 1.—Structural and magnetic studies

Bickley, R.I.; Lees, John S.; Tilley, R.J.D.; Palmisano, Leonardo; Schiavello, M.

doi:10.1039/ft9928800377

Cited by 90 publications

(27 citation statements)

References 16 publications

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“…This finding can be explained by considering that the Fe 3+ content in the Fe-TiO 2 samples is below the detection limit or that amorphous iron oxides species are very dispersed onto the surface of TiO 2 particles. Another explanation is that all Fe 3+ ions might substitute Ti 4+ ions and insert into the crystal lattice of TiO 2 (at least only into the very top layers of the crystallites, due to the relatively low temperature of heating at which the diffusion extent of the ions cannot be very significant) because the radius of Fe 3+ (0.69 Å) is similar to that of Ti 4+ (0.745 Å) [22][23][24]. The crystallite size of the catalysts was calculated from the line broadening.…”

Section: Catalyst Characteristicsmentioning

confidence: 96%

Degradation of 4-nitrophenol (4-NP) using Fe–TiO2 as a heterogeneous photo-Fenton catalyst

Zhao

Mele

Pio

et al. 2010

Journal of Hazardous Materials

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179

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Section: Catalyst Characteristicsmentioning

confidence: 96%

Degradation of 4-nitrophenol (4-NP) using Fe–TiO2 as a heterogeneous photo-Fenton catalyst

Zhao

Mele

Pio

et al. 2010

Journal of Hazardous Materials

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179

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“…Cu-TiO 2 was prepared by TiO 2 impregnation with CuSO 4 aqueous solutions (incipient wetness impregnation method) [25] at 298 K. First TiO 2 was mixed with an aqueous solution of CuSO 4 . The TiO 2 + metal mixture was stirred for 48 h. Later, water was evaporated by heating it at 373 K over 24 h. Finally, the catalysts were calcined at 773 K for 5 h. Metallic precursor concentration was required to obtain 0.5% (w/w) of dopant.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Role of Cu in the Cu-TiO2 photocatalytic degradation of dihydroxybenzenes

Araña¹,

Fernández-Rodríguez²,

Díaz³

et al. 2005

Catalysis Today

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“…Figure 7 shows that there is also little anatase-to-rutile transformation, which is consistent with the literature. 19 Only a small amount (<10% based on XRD data) of rutile can be found in the powders produced, even in that produced at 900°C. As shown in Table I, there is little growth after calcination at 600°C for 3 h. The observed…”

Section: (2) Effect Of Calcination On the Microstructure Of Tio 2 Promentioning

confidence: 99%

Effects of Calcination on the Microstructures and Photocatalytic Properties of Nanosized Titanium Dioxide Powders Prepared by Vapor Hydrolysis

Chan

Porter

et al. 1999

Journal of the American Ceramic Society

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Ultrafine titanium dioxide powders are produced in an aerosol reactor using vapor hydrolysis of titanium tetraisopropoxide (TTIP) at 260°C and higher temperatures (600°, 700°, 800°, and 900°C). The effect of calcination on the microstructure characteristics and the photoactivity is studied. The powders are characterized using BrunauerEmmett-Teller (BET) surface area, X-ray diffraction (XRD), and transmission electron microscopy (TEM) analyses. The photocatalytic activity of the powders is also studied using degradation of phenol in water as a test reaction. The powder produced at 260°C is calcined at 500°to 900°C while those produced at higher temperatures are calcined at 600°C for 3 h. Raw powder produced at 260°C is amorphous but becomes crystalline after calcination. As the calcination temperature increases, the surface area decreases but the rutile-to-anatase ratio and the anatase and rutile crystallite sizes increase. The photoactivity increases as calcination temperature increases to 900°C, when the powder becomes densified and the surface area drops significantly because of sintering. Powders produced at higher temperatures are predominantly anatase and are generally more photoactive. Calcination of the powders at 600°C for 3 h results in little loss of surface areas and enhances the photoactivity. Among the factors examined, large surface area and good dispersion of the powders in the reaction mixture are favorable to photoactivity. Conversely, prolonged calcination at high temperatures is detrimental to photoactivity. However, surface area, crystallite size, anatase-to-rutile ratio, and dispersity of the powders alone cannot account for the observed trend of photoactivity. The role of crystallinity needs to be investigated.

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Characterisation of iron/titanium oxide photocatalysts. Part 1.—Structural and magnetic studies

Cited by 90 publications

References 16 publications

Degradation of 4-nitrophenol (4-NP) using Fe–TiO2 as a heterogeneous photo-Fenton catalyst

Degradation of 4-nitrophenol (4-NP) using Fe–TiO2 as a heterogeneous photo-Fenton catalyst

Role of Cu in the Cu-TiO2 photocatalytic degradation of dihydroxybenzenes

Effects of Calcination on the Microstructures and Photocatalytic Properties of Nanosized Titanium Dioxide Powders Prepared by Vapor Hydrolysis

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