Effect of the titanium glycerolate precursor heat treatment procedure on the morphology and photocatalytic properties of TiO2 nanopowder

Захарова, Г. С.; Andreikov, E. I.; Osipova, V. A.; Yatluk, Yu. G.; Пузырев, И. С.

doi:10.1134/s0020168513100154

Cited by 17 publications

(9 citation statements)

References 20 publications

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“…Although the pattern can not be indexed to any known structure in database, some literatures refer it as titanium glycerolate (TiGly). 45 After calcination at 470 °C for 1 h, the final product (referred as defected TiO 2 ) can be undoubtedly identified as anatase TiO 2 (JCPDS no. 46 From TG analysis (Figure 1a 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 loss of the powders in the range of 200-470 °C is 52.9%, which is close to the theoretical weigh loss (52.1%) of TiGly to TiO 2 .…”

Section: Formation Of Anatase Tiomentioning

confidence: 99%

Titanium-Defected Undoped Anatase TiO₂ with p-Type Conductivity, Room-Temperature Ferromagnetism, and Remarkable Photocatalytic Performance

et al. 2015

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Defects are critically important for metal oxides in chemical and physical applications. Compared with the often studied oxygen vacancies, engineering metal vacancies in n-type undoped metal oxides is still a great challenge, and the effect of metal vacancies on the physiochemical properties is seldom reported. Here, using anatase TiO2, the most important and widely studied semiconductor, we demonstrate that metal vacancies (VTi) can be introduced in undoped oxides easily, and the presence of VTi results in many novel physiochemical properties. Anatase Ti0.905O2 was synthesized using solvothermal treatment of tetrabutyl titanate in an ethanol-glycerol mixture and then thermal calcination. Experimental measurements and DFT calculations on cell lattice parameters show the unstoichiometry is caused by the presence of VTi rather than oxygen interstitials. The presence of VTi changes the charge density and valence band edge of TiO2, and an unreported strong EPR signal at g = 1.998 presents under room temperature. Contrary to normal n-type and nonferromagnetic TiO2, Ti-defected TiO2 shows inherent p-type conductivity with high charge mobility, and room-temperature ferromagnetism stronger than Co-doped TiO2 nanocrystalline. Moreover, Ti-defected TiO2 shows much better photocatalytic performance than normal TiO2 in H2 generation (4.4-fold) and organics degradation (7.0-fold for phenol), owing to the more efficient charge separation and transfer in bulk and at semiconductor/electrolyte interface. Metal-defected undoped oxides represent a unique material; this work demonstrates the possibility to fabricate such material in easy and reliable way and thus provides new opportunities for multifunctional materials in chemical and physical devices.

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Section: Formation Of Anatase Tiomentioning

confidence: 99%

Titanium-Defected Undoped Anatase TiO₂ with p-Type Conductivity, Room-Temperature Ferromagnetism, and Remarkable Photocatalytic Performance

et al. 2015

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“…This efficiency is comparable with the already reported (2.8% at light intensity of 100 mW/cm 2 ) glycerol based solvothermal method synthesis of TiO 2 [29] . The other reported work from glycerol based microwave synthesis method, a 3-D hedgehog structure with an efficiency of 5.37% was achieved with supporting solvents and binders of Triton X-100, alpha teriphenol used for the paste preparation [30]. It also needs a modified microwave oven.…”

Section: Resultsmentioning

confidence: 99%

“…Fiber like titanium glycerolate and anatase nanorods were obtained using condenser based experimental setup heated to 190 C about 24 hours [29]. ⁰ Titanium glycerolate (TiGly) nanoribbons were synthesized by the solvothermal method in glycerol medium and the obtained gel-like substance was dried in rotary evaporator followed by three different calcination processes to attain TiO 2 powder for photocatalytic activity [30]. Titanium glycerolate microspheres with the granules of nanobelts, which results in flower-like morphology were prepared by solvothermal method with the supporting solvents.…”

Section: Introductionmentioning

confidence: 99%

Effect of microwave power irradiation on TiO2 nano-structures and binder free paste screen printed dye sensitized solar cells

Vinodhini

Mayandi

Atchudan

et al. 2019

Ceramics International

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Titanium dioxide (TiO 2) nanostructures (nanorods and nanoparticles) were prepared using a low-cost microwave irradiation method from a polyol medium of glycerol. Titanium glycerolate and TiO 2 powders were obtained in the glycerol medium for the first time with four different power densities (240W, 480W, 720W, 960W) of irradiation using a domestic microwave oven of 2.45 GHz, to understand the impact of power on morphology tuning. The structural and morphological features of the titanium glycerolate and TiO 2 powders were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and Raman spectra analysis. The TiO 2 was successfully used in the fabrication of photovoltaic devices and as a proof-of-concept binder free paste was prepared and successfully employed for photo-anode using screen printing on the fluorinedoped tin oxide substrate.

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“…The SPS method is used to study the separation of photogenerated charges [14,15]. Figure 7 shows the photo emf spectra of all of the catalysts considered.…”

Section: Resultsmentioning

confidence: 99%

“…The most common deep oxidation catalyst is tita nium dioxide, which is an inexpensive, stable, and non toxic material [14,15]. However, TiO 2 suffers from a serious drawback: its photocatalytic activity is insuffi ciently high [16].…”

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Physicochemical properties and photocatalytic activity of H3PW12O40/TiO2

Vorontsov

Jing

2015

Kinet Catal

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For enhancing its photocatalytic activity, titanium dioxide P25 has been modified by adsorption of the heteropoly acid (HPA) H 3 PW 12 O 40 from aqueous solution at an HPA concentration of 0.2 to 5 mmol/L. The deposition of the HPA does not alter the phase composition or morphology of the photocat alyst but only causes a slight change in its diffuse reflectance spectrum. IR spectroscopic and XPS studies have confirmed that the HPA molecules on the TiO 2 surface are intact. The adsorption of the HPA increases the photovoltage and hydroxyl radical yield under UV irradiation. These characteristics reach their maximum values upon the adsorption of the HPA from its 0.5 mmol/L solution. Electrochemical measurements have demonstrated that the HPA increases the rate of interfacial electron transfer. The deposition of the HPA accelerates the gas phase oxidation of acetaldehyde and the degradation of phenol and triethyl phosphate in the aqueous medium. The highest activity is shown by the catalyst obtained by the adsorption of H 3 PW 12 O 40 from its 0.5 mM solution. The results of this study suggest that the HPA is promising for modifying the surface of the TiO 2 photocatalyst.

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Effect of the titanium glycerolate precursor heat treatment procedure on the morphology and photocatalytic properties of TiO2 nanopowder

Cited by 17 publications

References 20 publications

Titanium-Defected Undoped Anatase TiO₂ with p-Type Conductivity, Room-Temperature Ferromagnetism, and Remarkable Photocatalytic Performance

Titanium-Defected Undoped Anatase TiO₂ with p-Type Conductivity, Room-Temperature Ferromagnetism, and Remarkable Photocatalytic Performance

Effect of microwave power irradiation on TiO2 nano-structures and binder free paste screen printed dye sensitized solar cells

Physicochemical properties and photocatalytic activity of H3PW12O40/TiO2

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Effect of the titanium glycerolate precursor heat treatment procedure on the morphology and photocatalytic properties of TiO2 nanopowder

Cited by 17 publications

References 20 publications

Titanium-Defected Undoped Anatase TiO2 with p-Type Conductivity, Room-Temperature Ferromagnetism, and Remarkable Photocatalytic Performance

Titanium-Defected Undoped Anatase TiO2 with p-Type Conductivity, Room-Temperature Ferromagnetism, and Remarkable Photocatalytic Performance

Effect of microwave power irradiation on TiO2 nano-structures and binder free paste screen printed dye sensitized solar cells

Physicochemical properties and photocatalytic activity of H3PW12O40/TiO2

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Titanium-Defected Undoped Anatase TiO₂ with p-Type Conductivity, Room-Temperature Ferromagnetism, and Remarkable Photocatalytic Performance

Titanium-Defected Undoped Anatase TiO₂ with p-Type Conductivity, Room-Temperature Ferromagnetism, and Remarkable Photocatalytic Performance