In situ preparation of g-C3N4/Bi4O5I2 complex and its elevated photoactivity in Methyl Orange degradation under visible light

Feng, Zhe Chuan; Zeng, Lin; Zhang, Qingle; Ge, Shifeng; Zhao, Xinyue; Lin, Hongjun; He, Yiming

doi:10.1016/j.jes.2019.05.032

Cited by 246 publications

(51 citation statements)

References 76 publications

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“…Water pollution has become a problem of concern in many countries [1][2][3][4][5]. Many dyes in wastewater contain aromatic compounds, which are chemically stable and harmful to human health [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Titanium Dioxide/Carbon Fiber (TiO2/CF) Composites for Removal of Methylene Blue (MB) from Aqueous Solution with Enhanced Photocatalytic Activity

Cheng

Zhang

Liu

et al. 2021

Journal of Chemistry

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TiO2 powder was firstly synthesized and carbon fiber was secondly prepared via the carbonization of polyaniline fiber, and TiO2/carbon fiber composites were lastly synthesized via a simple method at room temperature. The prepared samples are evidently investigated by X-ray powder diffraction, scanning electron microscopy, energy dispersive spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy, photoluminescence spectrum, and X-ray photoelectron spectroscopy, respectively. Using the monochromatic light of ultraviolet, the photocatalytic activity of the TiO2/CF composites was accurately evaluated with respect to the degradation of an aqueous dye (methylene blue) solution. The relationship between the photocatalytic degradation of methylene blue dye and its ratio, contact time, and the amount of catalyst was studied. The kinetics and mechanisms of degradation were discussed. The results show that TiO2/CF composites have good photocatalytic activity and stability. The TiO2/CF2/1 composite was used in effective photocatalytic degradation of methylene blue, the weight ratio of TiO2 to carbon fiber was 2:1, and the degradation rate was obtaining up to 97.7% of degradation during 120 min of reaction. The photocatalytic stability of TiO2/CF composites was dependent on the stability of their structure. After 5 repeated uses, the composite TiO2/CF2/1 still exhibited rather high activity toward the degradation of methylene blue, where the decolorization efficiency of methylene blue achieved 92% and the loss of activity was negligible. Based on radical trapping experiments, the mechanism of TiO2/CF composites on photocatalytic degradation of methylene blue is proposed, which could explain the enhanced photocatalytic activity of the composites better. Superoxide radicals, photogenerated holes, and photogenerated electrons were the main active substances for methylene blue degradation.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Titanium Dioxide/Carbon Fiber (TiO2/CF) Composites for Removal of Methylene Blue (MB) from Aqueous Solution with Enhanced Photocatalytic Activity

Cheng

Zhang

Liu

et al. 2021

Journal of Chemistry

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“…20 Further research had been motivated by their tunable band gaps, earth-abundance, low cost of synthesis and ease of surface functionalization. In particular, g-C 3 N 4 is an ideal choice for coupling with perovskite-type metal oxide compounds such as AgNbO 3 , KTa 0.75 Nb 0.25 O 3 and bismuth oxyhalide-based semiconductors, and black phosphorus [21][22][23][24] to form hybrid photocatalysts that greatly hinder the annihilation of charge carriers and extend the life of electrons. However, there are few reports on the preparation of highly stable MAPbBr 3 /C 3 N 4 hybrid intergrowth microcrystal photocatalysts as well as investigation of interfacial charge carrier dynamics.…”

Section: Introductionmentioning

confidence: 99%

Isopropanol-assisted synthesis of highly stable MAPbBr₃/p-g-C₃N₄ intergrowth composite photocatalysts and their interfacial charge carrier dynamics

Wang

Qin

et al. 2020

Nanoscale Adv.

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Two phase photocatalysts can be intergrown with each other, resulting in superior photocatalytic properties. Herein, methylamine lead bromide (MAPbBr 3 ) wrapped/entrapped protonated graphitic carbon nitride (p-g-C 3 N 4 ) intergrowth microcrystals were fabricated by mixing a pervoskite precursor with p-g-C 3 N 4 colloidal sol. A highly stable isopropanol (IPA) solvent based photocatalytic system for dye degradation was demonstrated. The composite with an optimal p-g-C 3 N 4 mass percentage of 3.3 wt% (denoted as MAPbBr 3 /p-g-C 3 N 4 -1.0 mg) exhibited the highest photocatalytic degradation of malachite green (99.8%) within 10 min under visible light, which was 5.3-fold and 16-fold greater than that exhibited by its constituents separately. The strong chemical interaction and fundamental photophysical processes in MAPbBr 3 /p-g-C 3 N 4 were systematically evaluated by spectroscopic and electrochemical techniques, confirming the effective separation of photogenerated electron-hole pairs and faster interfacial charge transfer behavior. Furthermore, active superoxide radicals (O 2 c À ) played a vital role in the catalytic reaction, because of the significant photoinduced electron transfer rate (k et ) in the inverted type-I core/shell MAPbBr 3 /p-g-C 3 N 4 band configuration structure. In addition, MAPbBr 3 /p-g-C 3 N 4 has good cycling stability for 10 cycles and versatility for other cationic (RhB) and anionic (MO) dye pollutants, indicating the great potential for solar energy conversion into chemical energy.

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“…[7] Graphitic carbon nitride (g-C 3 N 4 ) is the best-known visible light-driven photocatalyst. [8] It is applied in the decomposition of organic pollutants, [9] hydrogen production, [10] CO 2 photoreduction, [11] and water splitting. [12] It is easily prepared from cheap and nitrogen-rich precursors such as urea, melamine, cyanamide, and dicyandiamides.…”

mentioning

confidence: 99%

Microwave‐assisted synthesis of the Fe₂O₃/g‐C₃N₄ nanocomposites with enhanced photocatalytic activity for degradation of methylene blue

Karimi

Iliyat

Atashkadi

et al. 2020

J Chinese Chemical Soc

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The preparation and photocatalytic performance of the Fe 2 O 3 /g-C 3 N 4 nanocomposites with different weight percentage of iron was investigated in this study. Samples were successfully synthesized using melamine and ferric nitrate as the precursors via the green and facile microwave-assisted method. The physicochemical and structural properties of the Fe 2 O 3-doped g-C 3 N 4 were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), the Brunauer-Emmett-Teller (BET) method, transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and ultraviolet-visible spectroscopy (UV-Vis). The photocatalytic activity of the Fe 2 O 3 /g-C 3 N 4 catalysts was evaluated by the degradation of methylene blue (MB) at room temperature under visible light irradiation. As expected, the assynthesized samples exhibited considerable improvement in the photodegradation of MB. The Fe 2 O 3 /g-C 3 N 4 (1.0 wt%) nanocomposite had superior photocatalytic activity, with almost 70% degradation efficiency within 90 min of irradiation. The enhanced performance was ascribed to the separation and migration of the photoinduced electron-hole pairs and taking part of the charge carriers in the chemical redox reactions at the surface of the photocatalyst. In this work, the effect of Fe weight percentage on the degradation potential was also studied, and the photocatalytic mechanism was proposed with the main reactive species •OH.

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In situ preparation of g-C3N4/Bi4O5I2 complex and its elevated photoactivity in Methyl Orange degradation under visible light

Cited by 246 publications

References 76 publications

Fabrication of Titanium Dioxide/Carbon Fiber (TiO2/CF) Composites for Removal of Methylene Blue (MB) from Aqueous Solution with Enhanced Photocatalytic Activity

Fabrication of Titanium Dioxide/Carbon Fiber (TiO2/CF) Composites for Removal of Methylene Blue (MB) from Aqueous Solution with Enhanced Photocatalytic Activity

Isopropanol-assisted synthesis of highly stable MAPbBr₃/p-g-C₃N₄ intergrowth composite photocatalysts and their interfacial charge carrier dynamics

Microwave‐assisted synthesis of the Fe₂O₃/g‐C₃N₄ nanocomposites with enhanced photocatalytic activity for degradation of methylene blue

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In situ preparation of g-C3N4/Bi4O5I2 complex and its elevated photoactivity in Methyl Orange degradation under visible light

Cited by 246 publications

References 76 publications

Fabrication of Titanium Dioxide/Carbon Fiber (TiO2/CF) Composites for Removal of Methylene Blue (MB) from Aqueous Solution with Enhanced Photocatalytic Activity

Fabrication of Titanium Dioxide/Carbon Fiber (TiO2/CF) Composites for Removal of Methylene Blue (MB) from Aqueous Solution with Enhanced Photocatalytic Activity

Isopropanol-assisted synthesis of highly stable MAPbBr3/p-g-C3N4 intergrowth composite photocatalysts and their interfacial charge carrier dynamics

Microwave‐assisted synthesis of the Fe2O3/g‐C3N4 nanocomposites with enhanced photocatalytic activity for degradation of methylene blue

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Isopropanol-assisted synthesis of highly stable MAPbBr₃/p-g-C₃N₄ intergrowth composite photocatalysts and their interfacial charge carrier dynamics

Microwave‐assisted synthesis of the Fe₂O₃/g‐C₃N₄ nanocomposites with enhanced photocatalytic activity for degradation of methylene blue