Enhancement in the photocatalytic activity of TiO 2 nanofibers hybridized with g-C 3 N 4 via electrospinning

Wang, Meng; Liu, Zhenglian; Fang, Minghao; Tang, Chao; Huang, Zhaohui; Liu, Yangai; Wu, Xiaowen; Mao, Yuanjie

doi:10.1016/j.solidstatesciences.2016.02.002

Cited by 27 publications

(15 citation statements)

References 31 publications

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“…Nevertheless, the high recombination of photoinduced electron-hole pairs and poor visible light response of TiO 2 needs to be overcome to enhance the photocatalytic performance [4,5]. Among the heterojunction semiconductors, graphitic carbon nitride (g-C 3 N 4 ) has been considered as one of the ideal candidates to alloy with TiO 2 for photocatalytic application due to its high thermal stability, chemical stability, and visible absorption properties [6].…”

Section: Introductionmentioning

confidence: 99%

Mechanistic Characteristics of Surface Modified Organic Semiconductor g-C3N4 Nanotubes Alloyed with Titania

et al. 2017

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The visible-light-driven photocatalytic degradation of Bisphenol A (BPA) was investigated using the binary composite of alkaline treated g-C3N4 (HT-g-C3N4) deposited over commercial TiO2 (Evonik Degussa GmbH, Essen, Germany). The existence and contribution of both TiO2 and g-C3N4/HT-g-C3N4 in the composite was confirmed through various analytical techniques including powder X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectra (UV-vis-DRS), and photoluminescence (PL) analysis. The results showed that the titania in the binary composite exhibited both pure rutile and anatase phases. The morphological analysis indicated that the spongy “morel-like” structure of g-C3N4 turned to nanotube form after alkaline hydrothermal treatment and thereby decreased the specific surface area of HT-g-C3N4. The low surface area of HT-g-C3N4 dominates its promising optical property and effective charge transfer, resulting in a deprived degradation efficiency of BPA two times lower than pure g-C3N4. The binary composite of HT-g-C3N4/TiO2 exhibited excellent degradation efficiency of BPA with 2.16 times higher than the pure HT-g-C3N4. The enhanced photocatalytic activity was mainly due to the promising optical band gap structure with heterojunction interface, favorable specific surface area, and good charge separation.

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Section: Introductionmentioning

confidence: 99%

Mechanistic Characteristics of Surface Modified Organic Semiconductor g-C3N4 Nanotubes Alloyed with Titania

et al. 2017

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“…The peaks between 3300 and 3000 cm −1 are related to the stretching vibration of N-H and the peak at 1637 cm −1 correspond to C=N bending vibration. The peak at 810 cm −1 is the most characteristic for g-C3N4 which is attributed to the out-of-plane bending vibration characteristic of heptazine rings [15,21]. Also, the characteristic peak of PVP fibers is the peak at 1657 cm −1 , which confirms the presence of C=O bonds.…”

Section: Xrd Patterns and Ft-ir Spectramentioning

confidence: 78%

“…In general, the nanofibers (1D) presented large surface area to volume ratioand they can weaken the recombination of electron-hole (h + -e − ) better than spherical particles, thus, the photocatalytic activity of a material can improve. Alternatively, the electrospinning technique can be also used for the fabrication of spherical particles [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…There are previous works about the fabrication of composite TiO 2 /g-C 3 N 4 fibers with electrospinning technique, following different experimental approaches (polymers, solvents, electrospinning parameters, light sources) and different g-C 3 N 4 /TiO 2 ratios [15,[17][18][19]. Comparing with the previous studies, the present work deals with: (a) The synthesis of g-C 3 N 4 /TiO 2 fibers with different ratios (up to 5 wt%) of g-C 3 N 4 and process conditions using PVP polymer, (b) all the reagents and precursors participated simultaneously to one-step electrospinning process, (c) a combination of solid-state and liquid phase characterization and analysis techniques for studying the catalysts properties and their photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Performance of Electrospun Nanofibrous TiO2/g-C3N4 Photocatalyst in Photocatalytic Degradation of Methylene Blue

et al. 2019

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TiO 2 /g-C 3 N 4 (GNT) fibers with 1%, 2.5% and 5% (wt%) ratios have been synthesized via one-step electrospinning using polyvinylpyrrolidone (PVP) polymer. Results showed mesoporous fibrous catalysts consisted of anatase (80.0-85.1%) and rutile phase (14.9-20.0%), with diameter between 200-300 nm and band gap lower than 3.0 eV confirming the absorption shift to visible-light region. The formation of • OH radicals and methylene blue dye degradation increases as the g-C 3 N 4 doping percent also increases, following the trend TiO 2 < GNT1% ≈ GNT2.5% < GNT5%. A z-scheme mechanism is attributed to the photocatalytic performance confirming the potential for green chemistry and environmental technology applications.

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“…4E), indicating the existence of carbon nitride [30]. , and 1635 cm −1 were assigned to the characteristic stretching modes of the C-N heterocycle [35] and the typical peak at 806 cm −1 was assigned to triazine units [36]. For In 2 O 3 , a characteristic absorption peak at 562 cm −1 was observed, which was assigned to the presence of In-O phonon vibration [37].…”

Section: Tem and Eds Analysesmentioning

confidence: 97%

Ball-milling combined calcination synthesis of In2O3/C3N4 for high photocatalytic activity under visible light irradiation

Zhang

Huang

et al. 2017

J Mater Sci: Mater Electron

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important practical value to prepare photocatalytic materials with high activity under visible light.Indium oxide (In 2 O 3 ), a n-type semiconductor material, has a direct band gap of 3.8 eV and an indirect band gap of 2.8 eV [2]. It is an effective sensitizer and its absorption spectrum can extend from ultraviolet region to the visible region. It has been widely used in solar cells [3], flat panel display [4], gas sensor [5]. However, due to the high electron-hole recombination rate, the efficiency of In 2 O 3 is still limited. In order to improve the photocatalytic activity of In 2 O 3 , researchers have used a variety of methods, such as morphology control [6,7], metal deposition [8], and combining with semiconductors [9][10][11].Graphitic carbon nitride (denoted as C 3 N 4 ) is a kind of medium band gap (2.7 eV) nonmetal photocatalyst [12]. It has good chemical stability and thermal stability. Furthermore, it can be used to split water into H 2 and O 2 and degrade organic pollutants under visible light irradiation [13]. But high photoproduction electron-hole recombination rate seriously affects the catalytic properties of C 3 N 4 . C 3 N 4 can be easily adhered on the surface of other compounds due to its softness. Deferent types of strategies have been used to make the catalytic properties of C 3 N 4 better, including coupling with metals [14][15][16] [29]. Compared with the original semiconductor materials, the photocatalytic performance of these composites were enhanced obviously. Through mechanism analyzing, the reason for photocatalytic performance enhancements may be the improvement of electron-hole migration and separation.Recently, some investigations about In 2 O 3 /C 3 N 4 were reported. In 2 O 3 /C 3 N 4 composites can be used for hydrogen evolution

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Enhancement in the photocatalytic activity of TiO 2 nanofibers hybridized with g-C 3 N 4 via electrospinning

Cited by 27 publications

References 31 publications

Mechanistic Characteristics of Surface Modified Organic Semiconductor g-C3N4 Nanotubes Alloyed with Titania

Mechanistic Characteristics of Surface Modified Organic Semiconductor g-C3N4 Nanotubes Alloyed with Titania

Enhanced Performance of Electrospun Nanofibrous TiO2/g-C3N4 Photocatalyst in Photocatalytic Degradation of Methylene Blue

Ball-milling combined calcination synthesis of In2O3/C3N4 for high photocatalytic activity under visible light irradiation

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