White light emission from a hybrid system of CIZS inorganic quantum dots and graphitic carbon nitride organic semiconductor

Au@MoS boosted carbon nitride for selective photoreforming of plastic waster: synergistic hydrogen production and value-added chemicals generation

Chitosan-based nanocomposite membranes for dye removal via membrane filtration: A review.

Oxidized g-C3N4 assembled Cu/Co-MOF composites for photocatalytic hydrogen production and pollutant degradation

Identification of fragments produced from dimethylamine in a Freeman-type ion source and deposition of carbon nitride films by injecting CNH+ ions

A critical review on whether reducing the bandgap width is the sole approach to enhancing photocatalytic efficiency in g-C3N4-based materials.

Switch on ultrasound and light: Exploring the piezo and photocatalytic properties of triazine carbon nitride towards the degradation of ciprofloxacin

Effective sulfur-doping enables remarkable photoelectrochemical performance of carbon nitride films in water splitting

Tunable Fe-doped porous carbon nitride nanotubes via MOF-mediated synthesis for efficient photocatalytic tetracycline degradation

High methane storage capacity of porous carbon nitride fullerenes decorated with transition metals: A DFT investigation

Functionalization and density functional theory investigation of silver-decorated graphitic carbon nitride for enhanced visible-light photocatalysis: Tetracycline degradation and hydrogen peroxide generation

Light-driven microbial factories for CO2 conversion to valuables: Recent advancements in photo-microbial electrosynthesis through integrated graphitic carbon nitride (g-C3N4)

Potassium and cyano group co-modified graphitic carbon nitride for enhanced hydrogen evolution and organic pollutant degradation

Nitrogen-rich carbon nitride (g-C3N5) is an environmentally friendly and metal-free organic semiconductor photocatalyst. In this study, a multistage-enhanced photocatalyst was developed using g-C3N5 and Ti3C2 MXene. Potassium salt and strong alkali regulation of g-C3N5 yielded a modified nitrogen-rich carbon nitride (KCN). Subsequently, MKCN was formed via electrostatic self-assembly with Ti3C2 MXene, creating a "photogenerated electron capacitor" structure where KCN generates photogenerated electrons as the "positive electrode", and Ti3C2 MXene receives electrons as the "negative electrode". Time-resolved photoluminescence (TRPL), femtosecond transient absorption (fs-TA), and Kelvin probe force microscopy (KPFM) results indicate that the "capacitor" structure enables effective spatial charge separation and uniform surface potential, prolonging carrier lifetimes and enhancing catalytic participation. First-principles calculations reveal that Ti3C2 MXene offers stronger O2 adsorption sites, increasing electron-O2 reaction probability and boosting two-electron oxygen reduction reaction (2e-ORR) activity for H2O2 production. In the composite system, rapid removal of photogenerated electrons from KCN increases hole concentration, inducing upward surface band bending and driving H2O oxidation to generate •OH. In situ spectra confirm this additional pathway for H2O2 generation. Thus, MKCN exhibits excellent H2O2 yield (32.61mmol g-1h-1), with good cycling stability. This work provide a new strategy and structure system for efficient photocatalytic H2O2 synthesis.

Synergistic removal of naproxen and Cr(VI) based on ultrathin porous carbon nitride nanosheets: Pollutant-mediated carrier separation and electron transfer potentiation mechanism

Here, for the first time, a study of composite graphitic carbon nitride photocatalysts based on laboratory synthesized TiO2 (g-C3N4/TiO2) for the hydrogen evolution reaction (HER) from aqueous solutions of organic substrates under visible light irradiation is presented. The methods to synthesize TiO2 and g-C3N4/TiO2 include precipitation and hydrothermal routes, followed by calcination. A comparison of the synthetic approaches was carried out using a variety of electron donor systems (glucose, ethanol and triethanolamine). The highest HER activity is achieved with a photocatalyst containing 10 wt% g-C3N4 on TiO2, obtained by precipitation. Pt- and Cu-modified photocatalysts exhibit hydrogen evolution rates of 161 and 34 µmol h-1 g-1, respectively, in aqueous glucose solution. This enhanced performance originates from the successful formation of effective heterojunctions between g-C3N4 and the different phases of TiO2, as well as the material sensitivity to both visible and UV light.

The present work represents the synthesis of graphitic carbon nitride (GCN) and Zinc Oxide (ZnO)-based nanocomposite via a simple wet chemical as well as hydrothermal method and modification of its photoluminescence (PL) properties with respect to the pure constituents of the hybrids. The as prepared pure and hybrid samples were analysed by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), High-Resolution Transmission Electron Microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDX), and Fourier-Transform Infrared Spectroscopy (FTIR). XRD confirmed the crystalline nature of ZnO whereas GCN matrix mostly remained amorphous in nature. When Scherrer’s equation was used the average crystallite grain size of the hybrid came out to be around 16 nm. Electron microscopic images showed the GCN incorporation into the rod-like structure of ZnO with profound interfacial contacts between the two materials. Combined XPS and EDX analysis was carried out to investigate the elemental composition and chemical states of the sample, whereas FTIR shows presence C-N bond that are typical characteristics of GCN sample. While the PL spectra of the samples were studied with excitation wavelength of 350 nm, it revealed strong interfacial interaction and charge transfer between the two components. The GCN-ZnO nanocomposite exhibits distinct PL characteristics with dominant blue-cyan emission around ∼455 and ∼491 nm and a suppressed ZnO defect-related yellow-orange emission at ∼622 nm. The pure GCN displays a single sharp emission at 422 nm, indicating its low-defect nature, while the reduced defect contribution in the composite confirms effective interfacial defect compensation. The CIE chromaticity coordinates further place the emission in the blue-cyan region. These finding thus established the potential of the hybrid system to be used as the component in opto-electronic devices.

Abstract Polyoxometalate (POM)-modified graphitic carbon nitride (gCN) has emerged as a promising candidate for heterogeneous catalytic reactions. The introduction of POM-modified graphitic carbon nitride as a novel ligand/binder composite represents a significant stride in material science, particularly in synthesizing organic–inorganic hybrid materials. When combined with phosphomolybdic acid (PMA), gCN can form an activated composite intermediate (gCN/PMA) exhibiting multifunctional properties suitable for various applications in materials science and catalysis. This study advocates for a gCN/PMA composite as a fresh starting reagent for chemical synthetic routes, leading to the creation of structured materials. This groundbreaking composite material utilizes the special properties of POMs and gCN, creating a versatile platform for the formation of derived metal semiconductor materials. Chemical synthetic routes, including the gCN/PMA composite, have been proposed for fabricating 2D and 3D porous doped gCN and nanoparticle@MOF hybrid materials. By harnessing the complementary properties of PMA and gCN, this composite material offers enhanced functionality and performance compared to its individual components. The potential for continued research and development in this area is immense, with the promise of significant and promising breakthroughs that will further solidify the role of these composites in advancing modern technology and sustainable solutions. This work opens up a world of possibilities for designing advanced materials with tailored properties for various applications, including photocatalysis, energy storage, and environmental remediation.

Enhanced photocatalytic degradation of Rhodamine B via iron/nickel co-doped graphitic carbon nitride: Synthesis, degradation mechanism, and DFT insights

CdS-loaded Fe-doped graphitic phase carbon nitride with type-II heterojunction as visible-light driven photo-Fenton catalyst for efficient degradation of ofloxacin in water