Synthesis and photocatalytic applications of nano-sized zinc-doped mesoporous titanium oxide

Sánchez-Muñoz, Sergio; Pérez‐Quintanilla, Damián; Gómez‐Ruiz, Santiago

doi:10.1016/j.materresbull.2012.10.032

Cited by 27 publications

(8 citation statements)

References 37 publications

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“…Therefore, as has been described and observed from our experimental results, the crystallinity of titanium oxidebased materials is associated with the calcina tion temperature, dopant agents and porosity of the samples, as the porous system may collapse at high calcination tempera tures as consequence of the irreversible transformation from anatase to rutile. [5,12,91] Interestingly, the analysis of the crystallite size of the nano structured systems (see Section 3.1 and Table 1) shows that the presence of fluorine generates slightly smaller systems compared to the undoped material TiO 2 500 and copperonly doped system TiO 2 [CuNO 3 ]500. This is interesting from a pho tocatalytic point of view, because it results in a larger contact surface between the catalyst and the substrate.…”

Section: X-ray Diffraction Studiesmentioning

confidence: 99%

“…For example, H 2 O 2 and the radicals OH • , O 2-• formed after the electron and the holes reach the external surface of titanium dioxide, are very important for the photodecomposition of organic pol lutants to CO 2 and H 2 O, which is true for the most active titanium dioxidebased materials. [5,6] The band gap value has a direct impact on the rate of electronhole (e --h +) recombination during the photocatalytic processes. In the case of titanium dioxide, the relatively large band gap, means there is a slow recombination rate compared to most of the other photocatalysts.…”

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confidence: 99%

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Synergistic Effect of Cu,F‐Codoping of Titanium Dioxide for Multifunctional Catalytic and Photocatalytic Studies

Díaz-Sánchez

Murgu

Díaz-García

et al. 2021

Advanced Sustainable Systems

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This material has been used as a photo catalyst for water splitting since 1972 when Fujishima and Honda reported its ability to generate hydrogen and oxygen from water molecules. [1] Titanium dioxide is normally used in advanced oxidation processes, [2] in systems capable of elimi nating a wide variety of chemicals in air and water, as well as solar fuel production (such as H 2 ). [3,4] The photoactivated pro cesses of titanium dioxidebased photo catalysts are achieved when the irradiation energy is higher than its band gap. This generates electrons in the conduction band and holes in valence band, which rapidly migrate to the TiO 2 surface and provoke the generation of extremely reactive spe cies. For example, H 2 O 2 and the radicals OH • , O 2-• formed after the electron and the holes reach the external surface of titanium dioxide, are very important for the photodecomposition of organic pol lutants to CO 2 and H 2 O, which is true for the most active titanium dioxidebased materials. [5,6] The band gap value has a direct impact on the rate of electronhole (e --h +) recombination during the photocatalytic processes. In the case of titanium dioxide, the relatively large band gap, means there is a slow recombination rate compared to most of the other photocatalysts. [7] Three main phases are present in TiO 2 : 1) Anatase (tetrag onal, a = b = 3.785 Å, c = 9.54 Å), 2) brookite (orthorhombic, a = 5.143 Å, b = 5.456 Å, c = 9.182 Å), and 3) rutile (tetragonal a = b = 4.593 Å, c = 2.959 Å). [8,9] The thermodynamically meta stable phases, anatase, and brookite, irrevocably pass into the stable phase of rutile at high temperatures. [7] Each of these phases show its own morphological characteristics and band gap value: In the case of anatase the band gap is of 3.2 eV, while rutile and brookite have band gaps of 3.0 and 3.3 eV, respec tively. In general, anatase shows the most attractive photocata lytic behavior due to its versatility and textural properties. [10][11][12] However, the anatase phase, due to its band gap, can only be activated by UV light, which accounts for approximately only 4% of the solar spectrum. Thus, in order to stabilize the anatase phase at elevated temperatures, and to utilize UV and visible light for photocatalysis, chemical modifiers and dopants are generally employed for the modification of the photocatalytic Titanium dioxide nanomaterials with improved catalytic and photo catalytic properties through codoping with copper and fluorine are synthesized and contain optimal textural and compositional properties, which are not possible without doping or with a single doping of Cu or F separately. The codoped systems promote the generation of a synergistic effect increasing activity of the systems in photocatalytic processes of both potential environmental or energy interest. The photocatalysts show very effective degradations of industrial and emerging contaminants such as ciprofloxacin (80% degradation) and naproxen (72% degradation) using UV light (300 W) in short periods of up to 15 min. An ad...

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Section: X-ray Diffraction Studiesmentioning

confidence: 99%

mentioning

confidence: 99%

Synergistic Effect of Cu,F‐Codoping of Titanium Dioxide for Multifunctional Catalytic and Photocatalytic Studies

Díaz-Sánchez

Murgu

Díaz-García

et al. 2021

Advanced Sustainable Systems

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“…The results indicate that particle aggregation occurred in the Zn‐doped TiO 2 . The pore size distribution of the ZT‐5‐450 was homogeneous leading to a narrow distribution . The BET surface area of HZT‐1/9 was bigger compared to ZT‐5‐450 because ZT‐5‐450 dispersed well in H 2 O 2 solution.…”

Section: Resultsmentioning

confidence: 94%

Synthesis and Modification of Zn‐doped TiO₂ Nanoparticles for the Photocatalytic Degradation of Tetracycline

Pang

Huang

et al. 2016

Photochem & Photobiology

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The synthesis of Zn-doped TiO2 nanoparticles by solgel method was investigated in this study, as well as its modification by H2 O2 . The catalyst was characterized by transmission electron microscopy, X-ray diffraction, Brunauer-Emmett-Teller, UV-visible reflectance spectra and X-ray photoelectron spectroscopy (XPS). The results indicated that doping Zn into TiO2 nanoparticles could inhibit the transformation from anatase phase to rutile phase. Zn existed as the second valence oxidation state in the Zn-doped TiO2 . Zn-doped TiO2 that was synthesized by 5% Zn doping at 450°C exhibited the best photocatalytic activity. Then, the H2 O2 modification further enhanced the photocatalytic activity. Zn doping and H2 O2 modifying narrowed the band gap and efficiently increased the optical absorption in visible region. The optimal degradation rate of tetracycline by Zn-doped TiO2 and H2 O2 modified Zn-doped TiO2 was 85.27% and 88.14%. Peroxide groups were detected in XPS analysis of H2 O2 modified Zn-doped TiO2 , favoring the adsorption of visible light. Furthermore, Zn-doped TiO2 modified by H2 O2 had relatively good reusability, exhibiting a potential practical application for tetracycline's photocatalytic degradation.

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“…In Fig. 4a, MHSS displayed a Type IV isotherm, with a distinct step at a relative (a) 10 pressure of 0.3 accompanied by a total absence of hysteresis. [29] The slight inclination of this step could suggest homogeneity in mesopore size although a hysteresis was not detected.…”

Section: Characterization Of Catalystsmentioning

confidence: 97%

“…It was documented that the photocatalytic activity of ZnO could be significantly enhanced after being doped onto mesoporous titania and multi-walled carbon nanotubes. [10,11] In fact, the use of numerous silica supports in heterogeneous catalyst designs has been extensively reported. [12,13] Among the supports, silica cores and mesoporous silica have been investigated for their high potential as supports for nanoparticles due to their easy preparation, good compatibility with other materials, and good environmental stability.…”

Section: Introductionmentioning

confidence: 99%

Zinc Oxide Nanoparticles-Immobilized Mesoporous Hollow Silica Spheres for Photodegradation of Sodium Dodecylbenzenesulfonate

et al. 2016

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ZnO-Immobilized mesoporous hollow silica spheres (ZnO/xMHSS; x ¼ 15, 30, 50 molar ratio of Zn/Si) were synthesized and examined as photocatalysts toward the degradation of sodium dodecylbenzenesulfonate (SDBS). The hollow structures of MHSS and ZnO-immobilized MHSS composite were evidenced by transmission electron microscopy analysis. X-ray diffraction results confirmed the presence of ZnO and a mesoporous structure in the synthesized materials. N 2 adsorption-desorption analysis also depicted the formation of a mesoporous structure and the increased surface area for the ZnO/xMHSS materials. Fourier transform infrared spectroscopy analysis revealed the formation of Si-O-Zn bonds due to interaction between ZnO and MHSS. The photocatalytic testing results indicated that all the ZnO/xMHSS materials showed improved efficiencies of 10-21 % toward the photodegradation of SDBS when compared with bare ZnO. Among the prepared materials, ZnO/15MHSS was the best photocatalyst, which photodegraded 68 % SDBS after 1 h reaction. The kinetic study demonstrated that the photocatalytic reaction followed the second-order model.

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Synthesis and photocatalytic applications of nano-sized zinc-doped mesoporous titanium oxide

Cited by 27 publications

References 37 publications

Synergistic Effect of Cu,F‐Codoping of Titanium Dioxide for Multifunctional Catalytic and Photocatalytic Studies

Synergistic Effect of Cu,F‐Codoping of Titanium Dioxide for Multifunctional Catalytic and Photocatalytic Studies

Synthesis and Modification of Zn‐doped TiO₂ Nanoparticles for the Photocatalytic Degradation of Tetracycline

Zinc Oxide Nanoparticles-Immobilized Mesoporous Hollow Silica Spheres for Photodegradation of Sodium Dodecylbenzenesulfonate

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Synthesis and photocatalytic applications of nano-sized zinc-doped mesoporous titanium oxide

Cited by 27 publications

References 37 publications

Synergistic Effect of Cu,F‐Codoping of Titanium Dioxide for Multifunctional Catalytic and Photocatalytic Studies

Synergistic Effect of Cu,F‐Codoping of Titanium Dioxide for Multifunctional Catalytic and Photocatalytic Studies

Synthesis and Modification of Zn‐doped TiO2 Nanoparticles for the Photocatalytic Degradation of Tetracycline

Zinc Oxide Nanoparticles-Immobilized Mesoporous Hollow Silica Spheres for Photodegradation of Sodium Dodecylbenzenesulfonate

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Synthesis and Modification of Zn‐doped TiO₂ Nanoparticles for the Photocatalytic Degradation of Tetracycline