Enhanced photocatalytic activity of ZnO/g-C3N4 nanofibers constituting carbonaceous species under simulated sunlight for organic dye removal

Naseri, Amene; Samadi, Morasae; Pourjavadi, Ali; Ramakrishna, Seeram; Moshfegh, A.Z.

doi:10.1016/j.ceramint.2021.06.026

Cited by 50 publications

(21 citation statements)

References 61 publications

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“…In another study, to prepare ZnO/carbon/( x wt %) g-C 3 N 4 nanofibers, different amounts of g-C 3 N 4 nanosheets were mixed with PVA and zinc acetate dihydrate as a precursor of the electrospinning technique and then annealed at 460 °C under a N 2 atmosphere . As shown in Figure b, the Z-scheme charge transfer mechanism governs photocatalytic degradation in ZnO/C/g-C 3 N 4 samples.…”

Section: Photocatalyst Fabrication By Electrospinningmentioning

confidence: 99%

Recent Developments of Electrospinning-Based Photocatalysts in Degradation of Organic Pollutants: Principles and Strategies

Samadi

Moshfegh

2022

ACS Omega

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Electrospinning is a simple and cheap process for forming one-dimensional (1D) nanofibers with controllable size, morphology, and chemistry. Besides these, the ultrahigh surface area with industrialization capability has attracted extensive interest in the research community. On the other hand, a photocatalytic process is a promising method for degrading organic pollutants that cannot be removed by conventional wastewater treatment. This review focuses on the recent progress of electrospun nanofibers for the photocatalytic degradation of water pollutants. The linkage between the electrospinning technique and the photocatalytic process is classified into two main categories: (1) polymeric electrospun nanofibers as a sacrificed template to form 1D photocatalysts and (2) polymeric electrospun nanofibers as a carrier of photocatalyst materials. We have thoroughly discussed the principles and fundamental issues of electrospinning as well as two main strategies to design and fabricate nanofiberbased photocatalysts for the ideal photodegradation of organics pollutants. The results of data mapping using VOSviewer demonstrated the recent trend and the importance of this field among researchers and engineers. Moreover, we have elaborated on the limitations and potential benefits of the two categories of electrospinning-based photocatalyst fabrication and practical application that will open new directions for future research.

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Section: Photocatalyst Fabrication By Electrospinningmentioning

confidence: 99%

Recent Developments of Electrospinning-Based Photocatalysts in Degradation of Organic Pollutants: Principles and Strategies

Samadi

Moshfegh

2022

ACS Omega

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“…The same g-C 3 N 4 content was also found in the g-C 3 N 4 /ZnO composites for the degradation of methyl orange [ 27 ] and amiloride [ 28 ] under visible light irradiation. Nevertheless, other authors have reported the best catalytic performance for g-C 3 N 4 /ZnO composites containing a lower g-C 3 N 4 content [ 29 , 30 , 31 , 32 ]. Therefore, Liu et al [ 29 ] concluded that 5.0 wt% of g-C 3 N 4 in g-C 3 N 4 /ZnO composites led to the highest activity for the photooxidation of rhodamine B (RhB) and the photoreduction of Cr 6+ under visible light irradiation, while 10 wt% of g-C 3 N 4 was determined to be the optimum amount for the removal of RhB over g-C 3 N 4 coated hollow pencil-like ZnO composites [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, Liu et al [ 29 ] concluded that 5.0 wt% of g-C 3 N 4 in g-C 3 N 4 /ZnO composites led to the highest activity for the photooxidation of rhodamine B (RhB) and the photoreduction of Cr 6+ under visible light irradiation, while 10 wt% of g-C 3 N 4 was determined to be the optimum amount for the removal of RhB over g-C 3 N 4 coated hollow pencil-like ZnO composites [ 32 ]. Recently, Naseri et al [ 31 ] prepared g-C 3 N 4 /ZnO nanofibers via an electrospinning technique for the degradation of MB under simulated solar radiation. The best catalytic performance was achieved with a composite containing 0.25 wt% of g-C 3 N 4 .…”

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 narrow spectral absorption (Eg = 3.37 eV) and low degree of separation of photogenerated electron–hole pairs of ZnO, however, limit its applications in photocatalysis [ 13 ]. Improving its light absorption capacity and promoting the separation of photogenerated electron–hole pairs can effectively improve the photocatalytic performance of ZnO [ 14 , 15 , 16 , 17 ]. Graphitic carbon nitride (g-C 3 N 4 ) possesses many good characteristics, such as a low band gap (Eg = 2.7 eV), stable physical and chemical properties, good absorption capacity of visible light, simple synthetic methods, thermal stability, and low cost [ 18 , 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Enhance ZnO Photocatalytic Performance via Radiation Modified g-C3N4

et al. 2022

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Environmental pollution, especially water pollution, is becoming increasingly serious. Organic dyes are one type of the harmful pollutants that pollute groundwater and destroy ecosystems. In this work, a series of graphitic carbon nitride (g-C3N4)/ZnO photocatalysts were facilely synthesized through a grinding method using ZnO nanoparticles and g-C3N4 as the starting materials. According to the results, the photocatalytic performance of 10 wt.% CN-200/Z-500 (CN-200, which g-C3N4 was 200 kGy, referred to the irradiation metering. Z-500, which ZnO was 500 °C, referred to the calcination temperature) with the CN-200 exposed to electron beam radiation was better than those of either Z-500 or CN-200 alone. This material displayed a 98.9% degradation rate of MB (20 mg/L) in 120 min. The improvement of the photocatalytic performance of the 10 wt.% CN-200/Z-500 composite material was caused by the improvement of the separation efficiency of photoinduced electron–hole pairs, which was, in turn, due to the formation of heterojunctions between CN-200 and Z-500 interfaces. Thus, this study proposes the application of electron-beam irradiation technology for the modification of photocatalytic materials and the improvement of photocatalytic performance.

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Enhanced photocatalytic activity of ZnO/g-C3N4 nanofibers constituting carbonaceous species under simulated sunlight for organic dye removal

Cited by 50 publications

References 61 publications

Recent Developments of Electrospinning-Based Photocatalysts in Degradation of Organic Pollutants: Principles and Strategies

Recent Developments of Electrospinning-Based Photocatalysts in Degradation of Organic Pollutants: Principles and Strategies

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

Enhance ZnO Photocatalytic Performance via Radiation Modified g-C3N4

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