Synergizing n → π* electronic transition and plasmonic hot electron injection enhances carrier generation of S-doped carbon nitride decorated with Au nanoparticles for Cr(VI) degradation

Shao, Junxia; Fei, Heng; Li, Hua; Yang, Linlin; Li, Miaomiao; Gao, Jin; Liao, Huarong; Lu, Jian‐Mei

doi:10.1016/j.seppur.2022.121515

Cited by 11 publications

(4 citation statements)

References 50 publications

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“…The presence of Cr( vi ) in the form of dichromate (Cr 2 O 7 −2 ) and hydrogen dichromate (HCrO 4 − ) facilitates their electrostatic interaction with the catalyst surface in acidic pH, while the presence of OH − under alkaline conditions induces electrostatic repulsion between the existing chromium ions and catalyst's surface inhibiting the reduction reaction. 51…”

Section: Resultsmentioning

confidence: 99%

“…To further evaluate the impact of pH on the Cr(VI) reduction performance of the BUCN catalyst, we conducted experiments with pH values ranging from 2 to 10 ) facilitates their electrostatic interaction with the catalyst surface in acidic pH, while the presence of OH − under alkaline conditions induces electrostatic repulsion between the existing chromium ions and catalyst's surface inhibiting the reduction reaction. 51 The XUCN photocatalyst demonstrated a higher rate of photooxidative degradation of rhodamine B (RhB, 20 mg L −1 ) compared to the bare PCN counterpart (Fig. 5C).…”

Section: Boosting Pcn Photocatalytic Activity Through 5-halouracil Do...mentioning

confidence: 99%

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Counterion chemistry of 5-halo (X: Cl, Br, I)-uracil derived carbon nitride: unlocking enhanced photocatalytic performance

Bhoyar,

Abraham,

Gupta

et al. 2024

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 99%

Section: Boosting Pcn Photocatalytic Activity Through 5-halouracil Do...mentioning

confidence: 99%

Counterion chemistry of 5-halo (X: Cl, Br, I)-uracil derived carbon nitride: unlocking enhanced photocatalytic performance

Bhoyar,

Abraham,

Gupta

et al. 2024

J. Mater. Chem. A

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show abstract

“…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%

“…While in an alkaline medium (pH ≥ 6), Cr(VI) exists in the form of CrO 4 2− . 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.…”

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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Nitrogen‐Rich Carbon Dot‐Mediated n→π* Electronic Transition in Carbon Nitride for Superior Photocatalytic Hydrogen Peroxide Production

Guo,

Zhou,

Huang

et al. 2024

Adv Funct Materials

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Solar‐driven synthesis of hydrogen peroxide (H2O2) through photocatalysis stands out as a promising avenue for sustainable energy generation, marked by environmental friendliness and industrial feasibility. However, the inherent limitations of carbon nitride (CN) in photocatalytic H2O2 production significantly impede their performance. Herein, a novel 0D/2D carbon dots‐modified CN nanosheet heterojunction (CDsMCN) is introduced, synthesized through a hydrothermal‐calcination tandem strategy induced by CDs derived from melamine. This innovative technique enhances the n→π* electronic transition in CDsMCN, accelerating the separation efficiency of electron‐hole pairs, boosting oxygen adsorption, and promoting a highly selective 2e− ORR. Comparative to pristine CN, CDs10MCN exhibited a remarkable tenfold increase in H2O2 production, reaching an impressive 1.48 mmol L−1. Furthermore, CDs10MCN demonstrates exceptional stability, maintaining its catalytic efficiency at the initial level over four consecutive cycles. The notable achievement of a molar selectivity of H2O2 ≈80% at an onset potential of 0.6 V (vs RHE) underscores its exceptional ability to produce the desired product selectively. Advanced in situ characterization together with DFT calculations revealed that the ultrathin CDs10MCN nanosheet heterojunction with enhanced n→π* electronic transition improves its optical properties, reduces bandgap, facilitates fast charge migration, and increases photocatalytic H2O2 performance, thereby serving as a promising candidate for advanced catalytic applications.

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Synergizing n → π* electronic transition and plasmonic hot electron injection enhances carrier generation of S-doped carbon nitride decorated with Au nanoparticles for Cr(VI) degradation

Cited by 11 publications

References 50 publications

Counterion chemistry of 5-halo (X: Cl, Br, I)-uracil derived carbon nitride: unlocking enhanced photocatalytic performance

Counterion chemistry of 5-halo (X: Cl, Br, I)-uracil derived carbon nitride: unlocking enhanced photocatalytic performance

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

Nitrogen‐Rich Carbon Dot‐Mediated n→π* Electronic Transition in Carbon Nitride for Superior Photocatalytic Hydrogen Peroxide Production

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