Photocatalytic TiO2 Nanorod Spheres and Arrays Compatible with Flexible Applications

Nunes, Daniela; Pimentel, Ana; Santos, Lídia; Barquinha, Pedro; Fortunato, Elvira; Martins, Rodrigo

doi:10.3390/catal7020060

Cited by 58 publications

(73 citation statements)

References 79 publications

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“…The network shape permits much more surface area for photocatalysis. These structures of NaOH-modified TiOF 2 have not been reported elsewhere. The Barrett-Joyner-Halenda (BJH) method was used to analyze the pore size distribution and pore volume and the surface area (S BET ) was calculated using the BET method.…”

Section: Phase Structures and Morphologymentioning

confidence: 89%

“…In the past, TiO 2 has been widely used as a photocatalyst in the photo-degradation of organic pollutants. However, it has a wide energy band gap (3.1-3.2 eV) which only permit its UV light response and can easily cause electron-hole recombination [1][2][3][4]. Thus, studies on changing morphology [1][2][3], modification [1,4,5], and other methods were conducted to decrease its band gap or inhibit its electron-hole recombination.…”

Section: Introductionmentioning

confidence: 99%

“…However, it has a wide energy band gap (3.1-3.2 eV) which only permit its UV light response and can easily cause electron-hole recombination [1][2][3][4]. Thus, studies on changing morphology [1][2][3], modification [1,4,5], and other methods were conducted to decrease its band gap or inhibit its electron-hole recombination. The discovery of non-titanium semiconductor photocatalysts with a narrow intrinsic energy band gap, efficiently driven by visible light, may also attract much attention [5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of NaOH-Modified TiOF2 and Its Enhanced Visible Light Photocatalytic Performance on RhB

2017

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NaOH-modified TiOF 2 was successfully prepared using a modified low-temperature hydrothermal method. Scanning electron microscopy shows that NaOH-modified TiOF 2 displayed a complex network shape with network units of about 100 nm. The structures of NaOH-modified TiOF 2 have not been reported elsewhere. The network shape permits the NaOH-modified TiOF 2 a S BET of 36 m 2 ·g −1 and a pore diameter around 49 nm. X-ray diffraction characterization shows that TiOF 2 and NaOH-modified TiOF 2 are crystallized with a pure changed cubic phase which accords with the SEM results. Fourier transform infrared spectroscopy characterization shows that NaOH-modified TiOF 2 has more O-H groups to supply more lone electron pairs to transfer from O of O-H to Ti and O of TiOF 2 . UV-vis diffuse reflectance spectroscopy (DRS) shows that the NaOH-modified TiOF 2 sample has an adsorption plateau rising from 400 to 600 nm in comparison with TiOF 2 , and its band gap is 2.62 eV, lower than that of TiOF 2 . Due to the lower band gap, more O-H groups adsorption, network morphologies with larger surface area, and sensitization progress, the NaOH-modified TiOF 2 exhibited much higher photocatalytic activity for Rhodamine B (RhB) degradation. In addition, considering the sensitization progress, O-H groups on TiOF 2 not only accelerated the degradation rate of RhB, but also changed its degradation path. As a result, the NaOH-modified TiOF 2 exhibited much higher photocatalytic activity for RhB degradation than the TiOF 2 in references under visible light. This finding provides a new idea to enhance the photocatalytic performance by NaOH modification of the surface of TiOF 2 .

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Section: Phase Structures and Morphologymentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of NaOH-Modified TiOF2 and Its Enhanced Visible Light Photocatalytic Performance on RhB

2017

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“…Afterward, Huang et al [20] found that the modification of TiO 2 with Ag/AgCl obviously improved its photocatalytic activity. However, previous research has mainly focused on the fabrication of nano-sized Ag/AgCl/TiO 2 catalysts, such as nanoparticles [21,22], nanospheres [23], nanoarrays [20,24] and nanofibers [25]. These nano-sized catalysts are difficult to separate directly Figure 1a,c,e, the surface of TF is homogeneous and smooth, while the surface of CTF and S-CTF are rough.…”

Section: Introductionmentioning

confidence: 99%

Novel Synthesis of Plasmonic Ag/AgCl@TiO2 Continues Fibers with Enhanced Broadband Photocatalytic Performance

Bao

Miao

et al. 2017

Catalysts

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Abstract:The plasmonic Ag/AgCl@TiO 2 fiber (S-CTF) photocatalyst was synthesized by a two-step approach, including the sol-gel and force spinning method for the preparation of TiO 2 fibers (TF), and the impregnation-precipitation-photoreduction strategy for the deposition of Ag/AgCl onto the fibers. NaOH aqueous solution was utilized to hydrolyze TiCl 4 , to synthesize TF and remove the byproduct HCl, and the produced NaCl was recycled for the formation and deposition of Ag/AgCl. The surface morphology, specific surface area, textural properties, crystal structure, elemental compositions and optical absorption of S-CTF were characterized by a series of instruments. These results revealed that the AgCl and Ag 0 species were deposited onto TF successfully, and the obtained S-CTF showed improved visible light absorption due to the surface plasmon resonance of Ag 0 . In the photocatalytic degradation of X-3B, S-CTF exhibited significantly enhanced activities under separate visible or UV light irradiation, in comparison to TF.

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“…He found that oxidation rate of 2-aminothiophenol using TiO2 NRA was found to be increased growth time. Daniela et al [14] was synthesized nanostructure of TiO2 nanorod array on PET substrate. The photocatalytic degradation rate under UV light was found to be 61% for the degradation of Rhodamine B dye.…”

mentioning

confidence: 99%

Synthesis of Nanostructure TiO2 Nanorod Array on FTO Substrate using Hydrothermal Method and its Photocatalytic Activity

Suryawanshi¹

2018

IJRASET

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In this work, one dimensional TiO2 nanorods array (NRA) was prepared by using hydrothermal method. The TiO2 NRA was grown on FTO substrate without using seed layer substrate. The effect of hydrothermal temperature and time on the morphology of TiO2 NRA was studied. The synthesized TiO2 nanostructure was characterized by different techniques. The structural properties were studied using X-Ray diffraction (XRD) technique, The morphological studied was done with Field emission scanning electron microscope (FE-SEM), UV-Visible spectroscopy and photoluminescence (PL) were used to evaluate optical properties of synthesized TiO2 nanostructures. The results showed that synthesized TiO2 nanorod array were grown vertically on FTO substrate with average diameter 50 nm and length up to 1 µm was achieved at about 1 µm. The photodegradation performance of TiO2 NRA was also studied and it was achieved up to 47% in 180 min under UV irradiation. Keywords: TiO2, nanorod array, photocatalyst, surface defects, hydrothermal I. INTRODUCTION TiO2 is a wide band gap (3.2 eV) semiconductor metal oxide has unique properties such as low-cost, non toxic, chemical stability and long-term photostability are useful for variety of applications. The one-dimensional TiO2 nanostructure such as nanorod array and nanotubes grown vertically on substrate have received considerable attention due to its higher surface to volume ratio, large number of active site and surface defects favorable for photocatalytic application [1][2][3] . The nanostructures of TiO2 have variety of application in water splitting, photodetector, dye sensitized solar cell, gas sensor and photocatalytic degradation of organic compounds [4][5][6][7][8] . Currently, vertically aligned single crystal rutile TiO2 nanorod array grown on substrate have a considerable interest due to its ability to suppress electron and hole recombination than polycrystalline TiO2 which is useful in dye sensitized solar cell, photodetector, photocatalyst and water splitting [9,10] . The rutile TiO2 NRA can be synthesized using various techniques such Liu and Aydil have been developed standard method to synthesize 001 oriented rutile TiO2 nanorod array on FTO substrate using low temperature hydrothermal route [11] . The photocatalytic properties of rutile TiO2 NRA for the degradation of organic compound have been studied by few researchers. Gao et [12] synthesized oriented single crystal rutile TiO2 NRA on seed layer deposited quartz glass substrate and its photocatalytic efficiency was found to 87% under irradiation of 254 nm UV light. Hwang et [13] a studied spectroscopic analysis of hydrothermally synthesized TiO2 NRA on FTO at temperature 200 o C with different growth time. He found that oxidation rate of 2-aminothiophenol using TiO2 NRA was found to be increased growth time. Daniela et al [14] was synthesized nanostructure of TiO2 nanorod array on PET substrate. The photocatalytic degradation rate under UV light was found to be 61% for the degradation of Rhodamine B dye. In above mention...

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Photocatalytic TiO2 Nanorod Spheres and Arrays Compatible with Flexible Applications

Cited by 58 publications

References 79 publications

Synthesis of NaOH-Modified TiOF2 and Its Enhanced Visible Light Photocatalytic Performance on RhB

Synthesis of NaOH-Modified TiOF2 and Its Enhanced Visible Light Photocatalytic Performance on RhB

Novel Synthesis of Plasmonic Ag/AgCl@TiO2 Continues Fibers with Enhanced Broadband Photocatalytic Performance

Synthesis of Nanostructure TiO2 Nanorod Array on FTO Substrate using Hydrothermal Method and its Photocatalytic Activity

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