Fe-doped titanium dioxide synthesized: Photocatalytic activity and mineralization study for azo dye

Vargas, Ximena; Tauchert, Elias; Marín, Juan; Restrepo, Gloria; Dillert, Ralf; Bahnemann, Detlef W.

doi:10.1016/j.jphotochem.2012.06.001

Cited by 30 publications

(11 citation statements)

References 30 publications

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“…For this purpose, in recent years, the technique of metal ion doping into TiO 2 has been widely studied [10][11][12][13]. Among a variety of transition metal ion dopants investigated, Fe 3+ has been found to be a good candidate due to its similar radius (0.69 Å) to that of Ti 4+ (0.75 Å) [14].…”

Section: Introductionmentioning

confidence: 99%

Application of Fe-doped TiO 2 specimens for the solar photocatalytic degradation of humic acid

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Application of Fe-doped TiO 2 specimens for the solar photocatalytic degradation of humic acid

et al. 2017

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“…In addition, iron is locally available, has a low cost and recent studies have shown good performance for iron doping under solar irradiation compared to other doping metals (10 (12)(13)(14)(15)(16)(17), and these depend on the synthesis method. After a literature review, we selected different amounts of iron for doping titanium (some of which were presented in a previous work (18)), that allowed us to define the percentages of iron for this study to evaluate the calcination at different temperatures. The Fe-doped TiO 2 synthesis used two different iron contents (Fe:Ti molar ratio percentage = 0.05% and 0.1%).…”

Section: Introductionmentioning

confidence: 99%

Characterization and Photocatalytic Evaluation (UV-Visible) of Fe-doped TiO2 Systems Calcined at Different Temperatures

Vargas

Marín

Restrepo

2015

Journal of Advanced Oxidation Technologies

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Abstract:There is growing interest in obtaining compounds with photocatalytic activity in the solar spectrum, and this has led to intense research on the topic. In our laboratory, Fe-doped TiO 2 was synthesized using the sol-gel method combined with the solvothermal technique at 200°C and calcined at temperatures between 350 o C and 620 o C. The samples were characterized by X-ray diffraction, Micro-Raman spectroscopy, Brunauer-Emmett-Teller specific surface area, diffuse reflectance spectroscopy, X-ray fluorescence and photocatalytic activity. All materials crystallized in the anatase phase. Additionally the 0.05% Fe-doped TiO 2 calcined at 620°C showed the presence of the rutile phase while 0.1% Fe-doped TiO 2 calcined at 620°C showed the presence of the brookite phase. Photoactivity was observed in the visible spectrum for 0.05% and 0.1% Fe-doped TiO 2 , calcined at 620 o C. Visible activity was attributed to the presence of rutile and an absorption shift to the visible spectrum. Because of the temperature increment, the crystal size grew and the surface area decreased.

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“…Consequently, many surface modification techniques have been used for enhancing the performance of TiO 2 photocatalysts (Park et al, 2013). Doping of transition or noble metals into TiO 2 is a promising method for improving the photocatalytic performance in the treatment of environmental contaminants (Bouras et al, 2007;Vargas et al, 2012;Yu et al, 2013;Inturi et al, 2014). Iron (Fe)-functionalized TiO 2 composites (Fe-TiO 2 ) are among the most popular transition metal-functionalized TiO 2 photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

“…Their popularity is a result of the reduced electron-hole pair recombination and narrow band gaps relative to conventional TiO 2 photocatalysts. Consequently, Fe-TiO 2 has been effectively used for the degradation of a number of environmental pollutants under visible-light irradiation (Cui et al, 2009;Tieng et al, 2011;Sun et al, 2012;Vargas et al, 2012). Moreover, Fe is less expensive than noble metals such as Pd, Pt, Rh, Ag, and Au, which allows for its widespread usage.…”

Section: Introductionmentioning

confidence: 99%

Iron-functionalized titanium dioxide on flexible glass fibers for photocatalysis of benzene, toluene, ethylbenzene, and o-xylene (BTEX) under visible- or ultraviolet-light irradiation

Yang

Tayade

et al. 2014

Journal of the Air & Waste Management Association

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Iron-functionalized titanium dioxide (TiO 2 ) composites with various Fe-to-Ti ratios were prepared on flexible glass fibers (GF-Fe-TiO 2 ) via a sol-gel method, followed by a dip-coating process. The photocatalytic ability of these composites in degrading selected volatile organic compounds (VOCs; benzene, toluene, ethylbenzene, and o-xylene [BTEX]) at indoor concentration levels was examined. The GF-Fe-TiO 2 composites were characterized using scanning electron microscopy, energy-dispersive X-ray elemental analysis, ultraviolet (UV)-visible spectroscopy, and X-ray diffraction. The GF-Fe-TiO 2 composites showed superior photocatalytic performance to that of a reference glass fiber-supported TiO 2 photocatalyst for the treatment of BTEX under visible light. However, this trend was reversed under UV irradiation. Specifically, the average BTEX photocatalytic efficiencies of the 0.01-GF-Fe-TiO 2 composite in a 3-hr visible-light photocatalytic process were 4%, 33%, 51%, and 74%, respectively. Conversely, the average BTEX photocatalytic efficiencies obtained for GF-TiO 2 were close to 0%, 5%, 16%, and 29%, respectively. These findings demonstrated that the GF-Fe-TiO 2 composites could be applied to photocatalytically purify BTEX, especially under visible-light exposure. Moreover, the GF-Fe-TiO 2 composites prepared with different Fe-to-Ti ratios displayed different BTEX photocatalytic decomposition efficiencies under visible or UV light, allowing for optimization of the Fe-to-Ti ratio (which was found to be 0.01).Implications: The application of nanomaterials for air purification necessitates a supporting material to stabilize them while in contact with the treated air in the photocatalytic chamber. Glass fibers have an obvious advantage over other supporting materials mainly because of its flexibility, which makes it much easier to handle. However, the applications of glass fibersupported, visible light-activated photocatalysts to the treatment of air pollutants are rarely reported in literature. Accordingly, this study aimed to investigate the applicability of glass fiber-supported Fe-TiO 2 for the purification of VOCs under visible-as well as UV-light exposure.

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Fe-doped titanium dioxide synthesized: Photocatalytic activity and mineralization study for azo dye

Cited by 30 publications

References 30 publications

Application of Fe-doped TiO 2 specimens for the solar photocatalytic degradation of humic acid

Application of Fe-doped TiO 2 specimens for the solar photocatalytic degradation of humic acid

Characterization and Photocatalytic Evaluation (UV-Visible) of Fe-doped TiO2 Systems Calcined at Different Temperatures

Iron-functionalized titanium dioxide on flexible glass fibers for photocatalysis of benzene, toluene, ethylbenzene, and o-xylene (BTEX) under visible- or ultraviolet-light irradiation

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