Engineering the photocatalytic performance of B-C3N4@Bi2S3 hybrid heterostructures for full‐spectrum‐driven Cr(VI) reduction and in-situ H2O2 generation: Experimental and DFT studies

Ghoreishian, Seyed Majid; Ranjith, Kugalur Shanmugam; Ghasemi, Masoomeh; Park, Bumjun; Hwang, Seung‐Kyu; Irannejad, Neda; Norouzi, Mohammad; Park, So Young; Behjatmanesh–Ardakani, Reza; Pourmortazavi, Seied Mahdi; Mirsadeghi, Somayeh; Han, Young‐Kyu; Huh, Yun Suk

doi:10.1016/j.cej.2022.139435

Cited by 41 publications

(10 citation statements)

References 114 publications

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“…Figure a shows the photocatalytic activities of pure CdS and CdS-rGO under simulated solar irradiation . Comparing the photocatalytic performances of binary complexes with different amounts of rGO, H 2 O 2 production by CdS-rGO-20 is much higher than that of CdS, with the yield reaching 70.6 μmol, which presents a 1.2-fold increase in production .…”

Section: Resultsmentioning

confidence: 98%

Graphene-Encapsulated CdS as a High-Performance Photocatalyst for H₂O₂ Production from Pure Water

Jiang

Chen

et al. 2023

Ind. Eng. Chem. Res.

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Photocatalytic production of H2O2 has drawn broad research attention owing to its environmental benignity. However, the low activity and selectivity of this process need to be addressed. Accordingly, we herein report a photocatalyst based on reduced graphene oxide loaded with CdS nanoparticles and modified with anthraquinone-2-sulfonate (AQS) to address the above challenges. A photocatalytic H2O2 yield of 558 μmol g–1 h–1 was achieved in purified water without an electron donor or aeration. Mechanistic studies showed that this high performance may be attributed to the combination of graphene and CdS promoting charge-carrier separation/transfer and increasing the quantity of adsorption and reaction sites as well as the highly selective two-electron oxygen reduction capacity of AQS. Overall, this composite photocatalyst overcomes a number of impediments to photocatalytic production of H2O2 and will facilitate the application of solar energy in the production of H2O2.

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Section: Resultsmentioning

confidence: 98%

Graphene-Encapsulated CdS as a High-Performance Photocatalyst for H₂O₂ Production from Pure Water

Jiang

Chen

et al. 2023

Ind. Eng. Chem. Res.

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“…At acidic pH, Cr(VI) exists in the form of oxyanions such as dichromate (Cr 2 O 7 –2 ) and hydrogen dichromate (HCrO 4 – ) in the solution, and the reduction reaction proceeds as per eqs and . While in an alkaline medium (pH ≥ 6), Cr(VI) exists in the form of CrO 4 2– . , In acidic conditions, the existence of positively charged H + enhances the electrostatic interaction between Cr 2 O 7 –2 and HCrO 4 – species and the catalyst’s surface . This resulted in the improved photo-reduction ability of the 10N- g -CDs/PCN catalyst in acidic pH.…”

Section: Resultsmentioning

confidence: 99%

“…44,45 In acidic conditions, the existence of positively charged H + enhances the electrostatic interaction between Cr 2 O 7 −2 and HCrO 4 − species and the catalyst's surface. 46 This resulted in the improved photo-reduction ability of the 10N-g-CDs/PCN catalyst in acidic pH. In contrast, at alkaline pH, the abundantly generated OH − creates electrostatic repulsion between CrO 4 2− and the catalyst, leading to lower Cr(VI) reduction photoactivity (eq 3).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Nitrogen-Doped Graphitic Carbon Dots Embedded in Carbon Nitride Scaffolds for Water Decontamination

Bhoyar

Saraswat

Jyothirmai

et al. 2023

ACS Appl. Nano Mater.

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Functionalized carbon dots (CDs) exhibit intriguing photo-exciton dynamics. CDs can donate or accept electrons depending on their functional groups and electrostatic characteristics. We exploited the electron-accepting capability of nitrogendoped graphitic carbon dots (N-g-CDs) to improve the chargecarrier separation of the polymeric carbon nitride (PCN) photocatalyst. L-Aspartic acid pyrolyzed at 320 °C yielded ∼25 nm size N-g-CDs that were embedded with PCN. The in-plane infiltration of nanosized N-g-CDs increased the surface area of PCN from 11.5 to 104.9 m 2 g −1 . The N-g-CDs/PCN hybrid catalyst tested for photocatalytic chromium reduction evidenced about a 3-fold higher rate than PCN. Also, the antibiotic tetracycline and rhodamine B dye rapidly degraded with faster degradation kinetics. The carrier dynamic analysis and computational investigations suggest that the electron acceptor feature of N-g-CDs governs the effective separation of photo-excitons and the high surface area of N-g-CDs/PCN contributes to photoactivity enhancement. This study offers insights into designing high-performance metal-free photocatalysts for water treatment applications.

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“…Due to the lower electronegativity of S in comparison with N, the substitution of S could make the local environments more polar, in which the carbon atoms next to S become more electrophilic, enhancing the adsorption of oxygen molecules [148] . Boron (B) was also one of the additional options to dope into g‐C 3 N 4 with the ability to replace N atoms in the network to modulate the band gap energies of the materials [157] …”

Section: Strategies To Modify G‐c3n4 For Enhancing H2o2 Photoproductionmentioning

confidence: 99%

“…[148] Boron (B) was also one of the additional options to dope into g-C 3 N 4 with the ability to replace N atoms in the network to modulate the band gap energies of the materials. [157] Based on the evidence from non-metallic doping, assisting in modulating the electronic structures of g-C 3 N 4 , the challenges in light absorption capacities still remain. Many studies observed the change in VB and CB positions of g-C 3 N 4 , which could gain efficient charge transportation in the system.…”

Section: Single-element Dopingmentioning

confidence: 99%

Graphitic Carbon Nitride Based Materials Towards Photoproduction of H₂O₂

et al. 2023

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Hydrogen peroxide (H 2 O 2 ) can be considered as one of the world's indispensable chemicals. However, the synthetic process can prompt several severe environmental and human health issues. However, solar H 2 O 2 production may provide opportunities to mitigate such issues. Graphitic carbon nitride (g-C 3 N 4 ) has emerged as one promising material for photocatalytic applications due to its unique properties. Although tremendous efforts in engineering g-C 3 N 4 have been proposed to improve catalytic results, the materials obtained still have some issues.Additionally, the mechanisms behind the production of H 2 O 2 by using such materials are not yet fully understood. Herein, we conducted a literature survey reviewing the production of H 2 O 2 using g-C 3 N 4 -based materials. The essential aspects of and current challenges in photocatalytic H 2 O 2 generation are discussed, which may provide insight for researchers to overcome barriers and develop sustainable methods for H 2 O 2 production.

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Engineering the photocatalytic performance of B-C3N4@Bi2S3 hybrid heterostructures for full‐spectrum‐driven Cr(VI) reduction and in-situ H2O2 generation: Experimental and DFT studies

Cited by 41 publications

References 114 publications

Graphene-Encapsulated CdS as a High-Performance Photocatalyst for H₂O₂ Production from Pure Water

Graphene-Encapsulated CdS as a High-Performance Photocatalyst for H₂O₂ Production from Pure Water

Nitrogen-Doped Graphitic Carbon Dots Embedded in Carbon Nitride Scaffolds for Water Decontamination

Graphitic Carbon Nitride Based Materials Towards Photoproduction of H₂O₂

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Engineering the photocatalytic performance of B-C3N4@Bi2S3 hybrid heterostructures for full‐spectrum‐driven Cr(VI) reduction and in-situ H2O2 generation: Experimental and DFT studies

Cited by 41 publications

References 114 publications

Graphene-Encapsulated CdS as a High-Performance Photocatalyst for H2O2 Production from Pure Water

Graphene-Encapsulated CdS as a High-Performance Photocatalyst for H2O2 Production from Pure Water

Nitrogen-Doped Graphitic Carbon Dots Embedded in Carbon Nitride Scaffolds for Water Decontamination

Graphitic Carbon Nitride Based Materials Towards Photoproduction of H2O2

Contact Info

Product

Resources

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Graphene-Encapsulated CdS as a High-Performance Photocatalyst for H₂O₂ Production from Pure Water

Graphene-Encapsulated CdS as a High-Performance Photocatalyst for H₂O₂ Production from Pure Water

Graphitic Carbon Nitride Based Materials Towards Photoproduction of H₂O₂