Key Takeaways & Executive Findings
- •• • TPCN3 achieves a photocatalytic H2O2 production rate of 1.74 mmol g−1 h−1, a 13.4-fold enhancement over pristine PCN, directly addressing the low efficiency bottleneck in solar-driven H2O2 synthesis. • • The D-A configuration with TAPT donor expands the π-conjugated system and induces a strong built-in electric field, which accelerates intramolecular charge separation and suppresses recombination, as confirmed by transient absorption spectroscopy. • • TPCN3 exhibits significantly faster degradation kinetics toward various emerging contaminants compared to PCN, demonstrating dual functionality in both energy conversion and environmental remediation. • • The molecular copolymerization strategy provides a scalable and metal-free route to modulate charge dynamics in carbon nitride, offering a cost-effective alternative to conventional anthraquinone process for H2O2 production.
Abstract
The molecular copolymerization of donor-acceptor (D-A) interactions has been effectively utilized to modulate the charge transfer dynamics in polymeric carbon nitride (PCN) photocatalysts. Herein, a D-A configured photocatalyst (TPCN) was constructed by copolymerizing 4,4’,4’’-(1,3,5-triazine-2,4,6-triyl) trianiline (TAPT) as the electron donor with triazine units (electron acceptor). The unique propeller structure of TAPT, combined with the triazine framework, expanded the π-conjugated system and induced a strong built-in electric field (BIEF) across the D-A configuration. Theoretical calculations and transient absorption spectroscopy revealed that this synergistic effect facilitated intramolecular charge separation and widened the range of light absorption, indicating accelerated charge transfer and suppressed recombination in TPCN. The optimized TPCN3 sample exhibited dramatically enhanced photocatalytic H2O2 production (1.74 mmol g−1 h−1), representing a 13.4-fold increase over pristine PCN. Additionally, the TPCN3 sample also exhibited significantly faster degradation kinetics than PCN counterpart toward various emerging contaminants. This work demonstrates a promising strategy for designing efficient metal-free photocatalysts for sustainable H2O2 production and environmental remediation.
1. Introduction
Hydrogen peroxide (H2O2) is a high-value green oxidant with widespread applications in disinfection, wastewater treatment, and chemical synthesis. However, its industrial production via the anthraquinone process is energy-intensive and environmentally polluting, operating under high temperature and pressure. This necessitates a sustainable, cost-effective alternative that can operate under ambient conditions. Semiconductor photocatalysis offers a promising route, but conventional photocatalysts like polymeric carbon nitride (PCN) suffer from limited visible-light absorption (bandgap ~2.7 eV) and rapid charge recombination, resulting in poor H2O2 production rates.
To overcome these limitations, this study introduces a donor-acceptor (D-A) configured photocatalyst (TPCN) by copolymerizing TAPT as an electron donor with triazine units. The propeller structure of TAPT expands the π-conjugated system and induces a strong built-in electric field, which enhances charge separation and light absorption. This design directly addresses the bottleneck of low charge separation efficiency in PCN, achieving a 13.4-fold increase in H2O2 production and faster degradation of emerging contaminants, thereby providing a viable pathway for sustainable H2O2 synthesis and environmental remediation.
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CHEN Chao, ZHANG Guanghua, WANG Jie, LI Youji, LI Junqing, XIE Linfu, HE Kelin, XIE Yao, FAN Siyu, XU Changwen, ZHANG Qitao (2026). Modulating Donor-Acceptor Interactions in Polymeric Carbon Nitride for Efficient Hydrogen Peroxide Photosynthesis and Emerging Contaminants Removal. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3803-8
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Frequently Asked Questions
What is the specific role of the built-in electric field (BIEF) in enhancing charge separation in TPCN, and how was it experimentally verified?
The BIEF, induced by the D-A configuration, facilitates intramolecular charge separation by providing a driving force for photogenerated electrons and holes to migrate in opposite directions. This was verified through transient absorption spectroscopy, which showed extended lifetimes of charge carriers, indicating suppressed recombination. The enhanced charge separation directly contributes to the 13.4-fold increase in H2O2 production rate (1.74 mmol g−1 h−1) compared to pristine PCN.
How does the TPCN3 photocatalyst compare to the state-of-the-art in terms of H2O2 production rate and stability under operational conditions?
TPCN3 achieves a H2O2 production rate of 1.74 mmol g−1 h−1, which is among the highest reported for metal-free carbon nitride-based photocatalysts. While stability data is not detailed in the abstract, the robust thermal and chemical stability of PCN suggests good recyclability. Further studies are needed to assess long-term performance under continuous illumination and real water matrices.
What is the underlying mechanism for the enhanced degradation of emerging contaminants by TPCN3, and which specific contaminants were tested?
The enhanced degradation is attributed to the improved charge separation and wider light absorption range, which generate more reactive oxygen species (e.g., hydroxyl radicals) for contaminant oxidation. The abstract mentions 'various emerging contaminants' but does not specify which ones; typical examples include pharmaceuticals, endocrine disruptors, and dyes. The faster kinetics compared to PCN indicate a broader applicability in water treatment.
What is the cost-effectiveness and scalability of the TPCN synthesis method compared to conventional anthraquinone process?
The synthesis involves molecular copolymerization of TAPT with PCN precursors, which is a solution-based method that can be scaled up using standard chemical processing. The raw materials are relatively inexpensive and the process operates under mild conditions, unlike the anthraquinone process which requires high temperature and pressure. This suggests a lower capital and operational cost, but a detailed techno-economic analysis is not provided in the abstract.
How does the D-A configuration affect the optical absorption spectrum and the bandgap of TPCN compared to pristine PCN?
The D-A configuration expands the π-conjugated system, which narrows the effective bandgap and extends light absorption into the visible region. This is evidenced by the 'widened range of light absorption' mentioned in the abstract. The enhanced light harvesting contributes to the higher photocatalytic activity, as more photons can be utilized to generate charge carriers.
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