Synthesis, Characterization, and Roles of Vacancy Defects in Polymer and Graphitized Carbon Nitride Photocatalysts: A Comprehensive Review

Polymers, Journal Year: 2025, Volume and Issue: 17(3), P. 334 - 334

Published: Jan. 26, 2025

Vacancy defect graphitic carbon nitride (g-C3N4) and conjugated polyimide (PI) polymer photocatalysts have become increasingly recognized as metal-free featuring an appropriate bandgap. The narrow absorption spectrum of visible light the rapid recombination rate photoexcited charge carriers in PI polymers g-C3N4 impede its photocatalytic performance. presence oxygen vacancies (OVs) photocatalysts, well nitrogen (NVs) (CVs) g-C3N4, can significantly enhance migration photogenerated electrons. Adding to improve electronic structure band gap width greatly efficiency g-C3N4. Defect engineering is important for increasing ability PI-polymer There remains a notable absence thorough review papers covering synthesis, characterization, applications vacancy-rich photocatalysis. This paper examines roles OVs PI-polymer, NVs, CVs thoroughly summarizes preparation approaches employed before after, during polymerization. scrutinizes spectroscopic characterization techniques, such EPR, XPS, PAS, XRD, FTIR, NMR, vacancy analysis. We also reviewed role vacancies, which include absorption, carrier separation, transfer dynamics. could serve comprehensive understanding, vacancy-engineered design framework, practical guide synthesizing characterizing.

Language: Английский

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Recent Progress in g-C3N4-Based Photocatalysts for Organic Pollutant Degradation: Strategies to Improve Photocatalytic Activity

Catalysts, Journal Year: 2025, Volume and Issue: 15(2), P. 148 - 148

Published: Feb. 4, 2025

With unique photochemical properties, graphitic carbon nitride (g-C3N4) has gained significant attention for application in photocatalytic degradation of a wide range organic pollutants. However, its performance is limited by the rapid electron–hole recombination and relatively weak redox capability. Substantial progress been made preparation g-C3N4-based photocatalysts with enhanced activity. This review summarizes recent advances strategies to improve activity their Morphology control, doping, functionalization, metal deposition, dye sensitization, defect engineering, construction heterojunctions can be used g-C3N4 through promoting charge carrier separation, reducing bandgap, suppressing recombination. Furthermore, oxidants, such as hydrogen peroxide persulfate, coupled enhance generation reactive oxygen species boost Precise control over structure during synthesis process remains challenge, further improvements are required photocatalyst stability mineralization rates More research development effort needed address existing challenges, refine design activity, promote practical pollutant degradation.

Language: Английский

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Coral-like porous tubular Ni doped g-C₃N₄ nanocomposites as bifunctional templates for photocatalytic degradation and fluorescence detection of sunset yellow in beverages

Journal of Materials Chemistry C, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

A one-step calcination method was used to prepare coral-like porous tubular g-C 3 N 4 (Ni–CN) bifunctional composites with Ni doped vacancies, which can be for photocatalytic degradation and fluorescence detection of sunset yellow in beverages.

Language: Английский

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Photodynamic antimicrobial nanocellulose-based paper with direct Z-scheme heterojunction for fruit freshkeeping

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: 508, P. 161067 - 161067

Published: Feb. 27, 2025

Language: Английский

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Porous graphitic carbon nitride with sodium doped and N vacancies for synergistically enhancing the performance of RhB photodegradation

Physica E Low-dimensional Systems and Nanostructures, Journal Year: 2025, Volume and Issue: unknown, P. 116233 - 116233

Published: March 1, 2025

Language: Английский

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Boosting Photocatalytic H₂O₂ Fuel Cell Performance with Conjugated Graphite-Phase Carbon Nitride Decorated by Ag Nanoparticles

ACS Sustainable Chemistry & Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: March 14, 2025

Language: Английский

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All-day multifunction hygroscopic salt/aerogels/photocatalysts system for efficient freshwater-hydrogen-oxygen co-production from air

Science China Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 14, 2025

Language: Английский

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Intensifying the charge transfer on N–(CxNx+1) catalysts system: A cutting–edge approach for sunlight driven hydrogen production†

Fuel, Journal Year: 2025, Volume and Issue: 394, P. 135113 - 135113

Published: March 23, 2025

Language: Английский

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Ag2S/Zn2+-Decorated g-C3N4 Type-II Heterojunction with Wide-Spectrum Response: Construction and Photocatalytic Performance in Ciprofloxacin Degradation

Molecules, Journal Year: 2025, Volume and Issue: 30(7), P. 1417 - 1417

Published: March 22, 2025

Antibiotic-based wastewaters seriously endanger human health and damage the ecological environment, photocatalytic degradation is a desirable strategy for eliminating these contaminants in water. Therefore, developing proper catalyst photodegradation of antibiotics, including ciprofloxacin (CIP), great importance. In this study, novel Ag2S/Zn2+-decorated graphitic carbon nitride (AZCN short) type-II heterojunctions are constructed through precipitation–calcination procedure. The high porosity with specific surface area 133.5 m2 g−1, as well positive synergy between Ag2S- Zn2+-decorated (abbreviated ZCN), enhance incident light harvesting, increase adsorption capacity reactant molecules, favor mass transfer promote separation transport photoinduced carriers, therefore improving efficiency CIP. Specifically, CIP (50 mL, 10 mg L−1) over 2.5% AZCN (10 mg) 18.1%, 43.1% 55.7% within 60 min irradiation using near-infrared light, visible simulated solar respectively. Moreover, it displays satisfactory recycling stability excellent universality. This research not only develops promising heterojunction photocatalyst but also offers some valuable insights water remediation.

Language: Английский

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Localized Phosphorization Manipulating Internal Electric Field Orientation in Carbon Nitride Homojunction for Efficient Photocatalytic Hydrogen Evolution

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 27, 2025

Abstract Internal electric fields (IEF) have been recognized as an efficacious driving force to improve the reactivity of photocatalysis. However, manageable modulation IEF in homojunction remains a great challenge. Herein, local phosphorization strategy by precisely controlling phosphorus (P) atom doping location is presented modulate orientation smartly high‐low crystalline carbon nitride (g‐C 3 N 4 ) homojunction. Different found guide different photocatalytic reaction paths. By incorporating P low‐crystalline g‐C (P‐LCN), modulated directing from P‐LCN high‐crystalline (HCN), which contributes S‐scheme mechanism over P‐LCN/HCN Conversely, HCN (P‐HCN) modulates LCN/P‐HCN reversing P‐HCN (LCN), and follows type‐II mechanism. Profiting effective photocarriers transfer separation dynamics, especially favored electrons reducing capacity, performs superior H 2 evolution (12.09 mmol·g −1 ·h than (4.53 ). Even 3% NaCl solution real seawater, still exhibits incredible production rates 8.45 4.61 , respectively. This study unravels modulating principle phosphorization‐dependent for first time opens potential enhancing efficiency

Language: Английский

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