The effect of graphitic carbon nitride precursors on the photocatalytic dye degradation of water-dispersible graphitic carbon nitride photocatalysts

Nguyen, Thi Kim Anh; Pham, Thanh-Truc; Nguyen-Phu, Huy; Shin, Eun Woo

doi:10.1016/j.apsusc.2020.148027

Cited by 106 publications

(58 citation statements)

References 48 publications

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“…In addition, it can be seen from Figure 1c that U-CN blue-shifted at 801 cm −1 . The main reason might be due to the hydrogen bond-containing which influences the triazine ring stretching in the g-C 3 N 4 structure [16].…”

Section: Structure and Morphologymentioning

confidence: 99%

“…T-CN exhibits stronger light absorption in the range of 400 to 700 nm than that of the other three samples. While the absorption edge of U-CN showed a significant blue shift with respect to the other three samples [16,21]. The band-gap energies of the samples are calculated by plots of (αhv)1/2 versus photo energy.…”

Section: Photoelectrochemical Propertiesmentioning

confidence: 99%

“…Tian et al found that uran-derived g-C 3 N 4 exhibits superior photocatalytic activity for tetracycline degradation under visible light when compared with thiourea and dicyandiamide [15]. Tim et al found thiourea served as the best water-dispersible photocatalyst for MB degradation [16]. Guan et al founded that g-C 3 N 4 synthesized from melamine and annealed in N 2 exhibited much higher catalytic activities for PMS activation rather than urea or thiourea [17].…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Reduction of Cr (VI) over g-C3N4 Photocatalysts Synthesized by Different Precursors

et al. 2021

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Graphitic carbon nitride (g-C3N4) photocatalysts were synthesized via a one-step pyrolysis process using melamine, dicyandiamide, thiourea, and urea as precursors. The obtained g-C3N4 materials exhibited a significantly different performance for the photocatalytic reduction of Cr(VI) under white light irradiation, which is attributed to the altered structure and occupancies surface groups. The urea-derived g-C3N4 with nanosheet morphology, large specific surface area, and high occupancies of surface amine groups exhibited superior photocatalytic activity. The nanosheet morphology and large surface area facilitated the separation and transmission of charge, while the high occupancies of surface amine groups promoted the formation of hydrogen adsorption atomic centers which were beneficial to Cr(VI) reduction. Moreover, the possible reduction pathway of Cr(VI) to Cr(III) over the urea-derived g-C3N4 was proposed and the reduction process was mainly initiated by a direct reduction of photogenerated electrons.

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Section: Structure and Morphologymentioning

confidence: 99%

Section: Photoelectrochemical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Reduction of Cr (VI) over g-C3N4 Photocatalysts Synthesized by Different Precursors

et al. 2021

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“…Nevertheless, its practical application is still limited by the low light absorption coefficient, poor porosity, and low-charge carrier mobility. Different strategies have been investigated to improve the chemical and texture properties, as well as the charge separation of g-C 3 N 4 , namely, using different precursors [ 10 ], synthesis, and post-treatment techniques [ 11 , 12 ], doping with metals and non-metals [ 13 , 14 ], in combination with carbon materials [ 15 , 16 , 17 , 18 ] and semiconductor heterojunction [ 19 , 20 ], among others.…”

Section: Introductionmentioning

confidence: 99%

One-Pot Thermal Synthesis of g-C3N4/ZnO Composites for the Degradation of 5-Fluoruracil Cytostatic Drug under UV-LED Irradiation

et al. 2022

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Graphitic carbon nitride (g-C3N4) was used to enhance the photocatalytic activity of ZnO nanoparticles for the degradation of 5-fluorouracil (5-FU) cytostatic drug under UV-LED irradiation. CN/ZnO composites were synthetized by an easy one-pot thermal method, varying the g-C3N4 loading, i.e., from 10 to 67 wt% and a post-thermal exfoliation in air. The physicochemical and optical properties of the materials were analyzed by several techniques. CN/ZnO composites showed a coral-like structure of spherical ZnO wurtzite particles on the g-C3N4 structure. In general, the synergism and heterojunction interface between both phases allowed the enhancement of the mesoporosity, light absorption ability, and the aromaticity of the corresponding composites. Moreover, the photocatalytic activity of the CN/ZnO composites was increased with the addition of g-C3N4 in comparison with pristine ZnO. The highest activity was found for the composite containing 25 wt% of g-C3N4 (i.e., CN25/ZnO), reaching the total degradation of 5-FU and a mineralization of 48% at 180 min, as well as a good photostability during four reuse cycles. Experiments with different pH solutions and scavengers allowed for the assessment of the reactive oxygen species (ROS) involved in the 5-FU degradation pathway, with radicals and non-radical species as the main responsible active species. Furthermore, a tentative photocatalytic mechanism was proposed for CN/ZnO composites.

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“…The unique physical structure, excellent chemical stability and tunable electronic properties support the photocatalytic activity in environmental applications (Yang et al 2020;Hasija et al 2021). g-C 3 N 4 can be facilely synthesized through the thermal polymerization of low-cost N-rich precursors such as urea, melamine, dicyandiamide, and thiourea (Jourshabani et al 2020;Nguyen et al 2021). Various modification strategies, such as elemental doping, heterojunction, defects engineering and structural regulation, have been reported to improve the properties for potential applications (Chen et al 2020a).…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Ultrasound assisted Fenton-like degradation of dyes using copper doped graphitic carbon nitride

Wang

Huang

Sun

et al. 2021

Water Science and Technology

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A novel copper doped graphitic carbon nitride (Cu-C3N4) was successfully synthesized and used as an effective Fenton-like catalyst. Cu-C3N4 was characterized by scanning electron microscopy, surface area analyzer, Fourier transform infrared spectroscopy, X-ray diffractometer, and X-ray photoelectron spectroscopy. Effect of process parameters including catalyst dosage, hydrogen peroxide (H2O2) concentration, solution pH, and initial methylene blue (MB) concentration was investigated to evaluate catalytic performance. The pseudo first-order kinetic model was used to describe the catalytic process. The enhancement of MB degradation is observed assisted by ultrasound. MB degradation of 96% is obtained within 30 min in Cu-C3N4/H2O2/ultrasound system, and the corresponding rate constant is 0.099 min−1. Effective MB degradation is obtained over a broad pH range (3.3–9.9). The catalytic mechanism is examined by ultraviolet-visible spectra, quenching test, and electron spin resonance determination. The dominant mechanism of MB degradation is ascribed to the ultrasonic H2O2 activation by Cu-C3N4 for hydroxyl radical generation. Cu-C3N4 has good reusability and is effective to degrade rhodamine B and acid orange 7. This work not only contributes to the field of wastewater treatment, but also provides insights into the synthesis of Fenton-like catalysts. The results manifest that Cu-C3N4 is a promising Fenton-like catalyst for dye degradation in the field of environmental pollution remediation.

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The effect of graphitic carbon nitride precursors on the photocatalytic dye degradation of water-dispersible graphitic carbon nitride photocatalysts

Cited by 106 publications

References 48 publications

Photocatalytic Reduction of Cr (VI) over g-C3N4 Photocatalysts Synthesized by Different Precursors

Photocatalytic Reduction of Cr (VI) over g-C3N4 Photocatalysts Synthesized by Different Precursors

One-Pot Thermal Synthesis of g-C3N4/ZnO Composites for the Degradation of 5-Fluoruracil Cytostatic Drug under UV-LED Irradiation

Ultrasound assisted Fenton-like degradation of dyes using copper doped graphitic carbon nitride

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