A novel core-shell structured α-Fe2O3/Cu/g-C3N4 nanocomposite for continuous photocatalytic removal of air ethylbenzene under visible light irradiation

Parvari, Rouhollah; Shahna, Farshid Ghorbani; Bahrami, Abdulrahman; Azizian, Saeid; Assari, Mohammad Javad; Farhadian, Maryam

doi:10.1016/j.jphotochem.2020.112643

Cited by 27 publications

(9 citation statements)

References 61 publications

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“…Therefore, the proposed type‐II heterojunction mechanism is unfavorable for the formation of

{{}^{\cdot}O}_{2}^{-}

and ˙OH. On the other hand, under UV and visible‐light irradiation, the Z‐scheme system can fit well with our photocatalytic results, which indicated that both oxygen species of

{{}^{\cdot}O}_{2}^{-}

and ˙OH are the reactive species in the photocatalytic system 61,62,64 . A direct Z‐scheme system without redox mediators was schematically illustrated in Figure 9d.…”

Section: Resultssupporting

confidence: 75%

“…In the case of pure CuFe 2 O 4 , the CB edge potential of CuFe 2 O 4 is located at a more positive location (0.64 eV) than the standard redox potential of O 2 /

{}^{\cdot}{normalO}_{2}^{-}

(−0.33 eV vs. NHE) which suggests that the photo induced electrons on its CB cannot reduce O 2 to

{{}^{\cdot}O}_{2}^{-}

(Figure 9a). 61–63 Similarly, the holes in the VB of CeO 2 cannot react with H 2 O or OH − to generate ˙OH as the VB potential of CeO 2 (1.61 eV vs. NHE) is less than the standard redox potential of OH − /˙OH (1.99 eV vs. NHE) 61 and also the CeO 2 can be excited only by UV‐light irradiation. Under UV‐light irradiation, had the charge transfer in the composite followed traditional type‐II mechanism (Figure 9d); the CuFe 2 O 4 @CeO 2 should absorbs photons to generate the electrons in CB of CeO 2 and then jumps onto the less negative CB of the CuFe 2 O 4 photocatalyst.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, under UV and visible-light irradiation, the Z-scheme system can fit well with our photocatalytic results, which indicated that both oxygen species of Á O À 2 and ˙OH are the reactive species in the photocatalytic system. 61,62,64 A direct Z-scheme system without redox mediators was schematically illustrated in Figure 9d. In a Zscheme-based heterojunction system, the electrons in the CB of…”

Section: Bet Analysismentioning

confidence: 99%

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A new approach to the synthesis of CuFe₂O₄@CeO₂ direct Z‐scheme with a core‐shell structure for enhanced photo‐degradation of methyl violet under ultraviolet and visible‐light irradiation

Touahra

Zemmache

Djema

et al. 2022

Env Prog and Sustain Energy

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A direct Z-scheme photocatalyst CuFe 2 O 4 @CeO 2 core-shell was applied in the photocatalytic degradation of the methyl violet dye 2B (MV). In first, CuFe 2 O 4 and CeO 2 were synthesized via sol-gel method, and then CuFe 2 O 4 @CeO 2 nanocomposite was prepared using microwave process. The nanoparticles were characterized by thermogravimetric analysis (TG and derivative thermogravimetry [DTG]), atomic absorption spectroscopy (AAS), Brunauer-Emmett-Teller (BET) analysis, Xray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), energy dispersive-X-ray (EDX) and ultraviolet (UV)visible diffuse reflectance/absorption spectroscopy. The photocatalytic activity of CuFe 2 O 4 @CeO 2 nanocomposite was evaluated by the photo-degradation of the MV under UV and visible-light irradiation. MV does not rapidly degrade itself in UV or visible-light but the process is accelerated upon the addition of semiconductors with a wide band-gap. The CuFe 2 O 4 @CeO 2 nanocomposite shows an important MV decomposition rate under visible-light irradiation (95.35% within 1.5 h) as compared to UV-light (86.10% within 2.5 h). The excellent activity of CuFe 2 O 4 @CeO 2 under UV and visible-light was mainly attributed to direct Z-scheme which are originated from a core-shell structure which prompted the generation of ˙OH radical species responsible for the photo-degradation of the substance. However, this could also be due to the large specific surface area and/or efficient UV-vis harvesting.

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“…Therefore, the proposed type‐II heterojunction mechanism is unfavorable for the formation of

{{}^{\cdot}O}_{2}^{-}

and ˙OH. On the other hand, under UV and visible‐light irradiation, the Z‐scheme system can fit well with our photocatalytic results, which indicated that both oxygen species of

{{}^{\cdot}O}_{2}^{-}

and ˙OH are the reactive species in the photocatalytic system 61,62,64 . A direct Z‐scheme system without redox mediators was schematically illustrated in Figure 9d.…”

Section: Resultssupporting

confidence: 75%

“…In the case of pure CuFe 2 O 4 , the CB edge potential of CuFe 2 O 4 is located at a more positive location (0.64 eV) than the standard redox potential of O 2 /

{}^{\cdot}{normalO}_{2}^{-}

(−0.33 eV vs. NHE) which suggests that the photo induced electrons on its CB cannot reduce O 2 to

{{}^{\cdot}O}_{2}^{-}

Section: Resultsmentioning

confidence: 99%

Section: Bet Analysismentioning

confidence: 99%

See 1 more Smart Citation

A new approach to the synthesis of CuFe₂O₄@CeO₂ direct Z‐scheme with a core‐shell structure for enhanced photo‐degradation of methyl violet under ultraviolet and visible‐light irradiation

Touahra

Zemmache

Djema

et al. 2022

Env Prog and Sustain Energy

View full text Add to dashboard Cite

show abstract

“…However, this peak was not observed on the other catalysts. The peaks at 1224-1647 and 3175 cm −1 of pure g-C 3 N 4 were attributed to the stretching vibration of the heterocyclic ring (C−N=C) and N−H [50][51][52][53][54][55], respectively. This peak of the heterocyclic ring shifted and became weaker in the CM/g-C 3 N 4 (1083-1176 cm −1 ), possibly because of the influence of Cu, Mg and O elements on the structure of the C−N=C.…”

Section: Ftirmentioning

confidence: 99%

Enhanced Degradation of Rhodamine B through Peroxymonosulfate Activated by a Metal Oxide/Carbon Nitride Composite

Wang

Zhang

et al. 2022

Water

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The development of high catalytic performance heterogeneous catalysts such as peroxymonosulfate (PMS) activators is important for the practical remediation of organic pollution caused by Rhodamine B (RhB). An economical and facile synthesized composite of copper–magnesium oxide and carbon nitride (CM/g-C3N4) was prepared by the sol-gel/high-temperature pyrolysis method to activate PMS for RhB degradation. CM/g-C3N4 exhibited a splendid structure for PMS activation, and the aggregation of copper–magnesium oxide was decreased when it was combined with carbon nitride. The introduction of magnesium oxide and carbon nitride increased the specific surface area and pore volume of CM/g-C3N4, providing more reaction sites. The low usage of CM/g-C3N4 (0.3 g/L) and PMS (1.0 mM) could rapidly degrade 99.88% of 10 mg/L RhB, and the RhB removal efficiency maintained 99.30% after five cycles, showing the superior catalytic performance and reusability of CM/g-C3N4. The synergistic effect of copper and g-C3N4 improved the PMS activation. According to the analyses of EPR and quenching experiments, SO4•−, •OH and O2•− radicals and 1O2 were generated in the activation of PMS, of which SO4•− and 1O2 were important for RhB removal. The toxicity of RhB was alleviated after being degraded by the CM/g-C3N4/PMS system. This study provides an efficient and promising strategy for removing dyes in water due to the hybrid reaction pathways in the CM/g-C3N4/PMS system.

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“…The most of photocatalytic materials, such as titanium dioxide (TiO 2 ), graphene‐based materials, and silica‐nanosphere‐based materials, etc., were applied in diverse categories of photocatalysis with outstanding performance, including organics degradation and H 2 production [1b,7] . Some findings have shown that some waterborne coatings with the combination of various incorporation nanoparticles, such as TiO 2 , [8] ZnO, [9] MoO 3 , [10] and Al 2 O 3 , [11] can significantly enhance the quality of the coating. For instance, paints products with TiO 2 nanoparticles were commercially applied to remove the pollutants in the air under the irradiation of UV‐light.…”

Section: Introductionmentioning

confidence: 99%

Construction of Graphitic Carbon Nitride Coating for Efficient Degradation of Ozone and Ozone Precursor

et al. 2022

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In this study, the aqueous solution of graphitic carbon nitrides (g-CN) is investigated as a green additive for the waterborne coating to the decompose ozone and its precursors (ozone precursors: total volatile organic compounds and oxynitride). The physical properties of the waterborne coating have been improved through a facile interface interaction between g-CN and waterborne coating. The results of SEM images, XRD patterns and FTIR spectrum indicated that the interface between g-CN sheets and waterborne coating is strengthened which gives rise to enhancement of interfacial effect, resulting in consequent improvement of the physical properties. Mean-while, the coating with g-CN exhibited excellent absorption ability toward visible light. As a result, the optimized waterborne coating with 0.1 wt % g-CN (C-0.1CN) casts the extraordinary photocatalytic degradation efficiency of ozone (99.5 v/v %). Moreover, the C-0.1CN can contribute degradation efficiency up to 75.3 % toward the total volatile organic compounds (TVOC) under the simulated indoor lighting condition for 48 hours. These findings provide a new way towards waterborne coating design for achieving high-efficiency photocatalytic indoor pollution degradation.

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A novel core-shell structured α-Fe2O3/Cu/g-C3N4 nanocomposite for continuous photocatalytic removal of air ethylbenzene under visible light irradiation

Cited by 27 publications

References 61 publications

A new approach to the synthesis of CuFe₂O₄@CeO₂ direct Z‐scheme with a core‐shell structure for enhanced photo‐degradation of methyl violet under ultraviolet and visible‐light irradiation

A new approach to the synthesis of CuFe₂O₄@CeO₂ direct Z‐scheme with a core‐shell structure for enhanced photo‐degradation of methyl violet under ultraviolet and visible‐light irradiation

Enhanced Degradation of Rhodamine B through Peroxymonosulfate Activated by a Metal Oxide/Carbon Nitride Composite

Construction of Graphitic Carbon Nitride Coating for Efficient Degradation of Ozone and Ozone Precursor

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A novel core-shell structured α-Fe2O3/Cu/g-C3N4 nanocomposite for continuous photocatalytic removal of air ethylbenzene under visible light irradiation

Cited by 27 publications

References 61 publications

A new approach to the synthesis of CuFe2O4@CeO2 direct Z‐scheme with a core‐shell structure for enhanced photo‐degradation of methyl violet under ultraviolet and visible‐light irradiation

A new approach to the synthesis of CuFe2O4@CeO2 direct Z‐scheme with a core‐shell structure for enhanced photo‐degradation of methyl violet under ultraviolet and visible‐light irradiation

Enhanced Degradation of Rhodamine B through Peroxymonosulfate Activated by a Metal Oxide/Carbon Nitride Composite

Construction of Graphitic Carbon Nitride Coating for Efficient Degradation of Ozone and Ozone Precursor

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A new approach to the synthesis of CuFe₂O₄@CeO₂ direct Z‐scheme with a core‐shell structure for enhanced photo‐degradation of methyl violet under ultraviolet and visible‐light irradiation

A new approach to the synthesis of CuFe₂O₄@CeO₂ direct Z‐scheme with a core‐shell structure for enhanced photo‐degradation of methyl violet under ultraviolet and visible‐light irradiation