Facile bottom-up preparation of Cl-doped porous g-C3N4 nanosheets for enhanced photocatalytic degradation of tetracycline under visible light

g-C3N4 has drawn lots of attention due to its photocatalytic activity, low-cost and facile synthesis, and interesting layered structure. However, to improve some of the properties of g-C3N4, such as photochemical stability, electrical band structure, and to decrease charge recombination rate, and towards effective light-harvesting, g-C3N4–metal oxide-based heterojunctions have been introduced. In this review, we initially discussed the preparation, modification, and physical properties of the g-C3N4 and then, we discussed the combination of g-C3N4 with various metal oxides such as TiO2, ZnO, FeO, Fe2O3, Fe3O4, WO3, SnO, SnO2, etc. We summarized some of their characteristic properties of these heterojunctions, their optical features, photocatalytic performance, and electrical band edge positions. This review covers recent advances, including applications in water splitting, CO2 reduction, and photodegradation of organic pollutants, sensors, bacterial disinfection, and supercapacitors. We show that metal oxides can improve the efficiency of the bare g-C3N4 to make the composites suitable for a wide range of applications. Finally, this review provides some perspectives, limitations, and challenges in investigation of g-C3N4–metal-oxide-based heterojunctions.

/pdf/a-comprehensive-review-of-graphitic-carbon-nitride-g-c3n4-11fzcq6u.pdf

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

A critical review of g-C3N4-based photocatalytic membrane for water purification

Enhanced photoreduction CO2 activity on g-C3N4: By synergistic effect of nitrogen defective-enriched and porous structure, and mechanism insights

Recent developments in architecturing the g-C3N4 based nanostructured photocatalysts: Synthesis, modifications and applications in water treatment

N vacancy modified g-C3N4 nano-fragments were facilely prepared through thermal treatment method. The declined size and thickness of resultant g-C3N4 nano-fragments make it possess quantum confinement effect. The synergistic effect of N vacancy and quantum confinement effect endows resulting g-C3N4 nano-fragments with bigger surface area, stronger light response ability and improved migration effect of photoinduced charge. Not only that, the existence of quantum confinement effect remedies the shortcoming that reduced intrinsic conduction band potential was caused by N vacancy, and the conduction band position was easily adjusted. When N vacancy modified g-C3N4 nano-fragments were used to produce H2, the H2 evolution rate of the best sample (nano-CN5) was 5.9 folds more than bulk g-C3N4 and kept admirable stability of performance, structure and feature. Clearly, the present work develops a useful strategy for adjusting conduction band position of g-C3N4 and a meaningful thought for changing band gap of other photocatalysts.

g-C3N4 nano-fragments as highly efficient hydrogen evolution photocatalysts: Boosting effect of nitrogen vacancy

Hydrothermal pre-treatment induced cyanamide to prepare porous g-C3N4 with boosted photocatalytic performance

https://iopscience.iop.org/article/10.1088/2053-1591/ab1fa4/pdf

Fabrication of wide visible-light response porous graphitic carbon nitride with excellent visible light photocatalytic performance

Cl doped porous defect modified graphitic carbon nitride (Cl-pdg-C3N4) have been synthesized by pyrolysis of the mixture of melamine and NH4Cl, and thoroughly analyzed by x-ray diffraction, Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, N2 adsorption-desorption isotherm, BET, UV–vis diffuse reflectance spectra, photoluminescence spectra and photoelectrochemical properties Experimental results indicated that Cl in NH4Cl could react with melamine to form supermolecule to induce the formation of porous structure Meanwhile, NH4Cl could occupy space to limit the long-range polymerization of g-C3N4, resulting in the formation of N defect Moreover, NH4Cl as the Cl element precursor could induce Cl element doped in the g-C3N4 system When Cl-pdg-C3N4 worked as photocatalyst for producing H2 and degrading rhodamine B under visible light, the as-prepared Cl-pdg-C3N4 presented more excellent photocatalytic activity and kept excellent recycled activity than bulk g-C3N4 Hence, this strategy provides insights into the fabrication of g-C3N4 with excellent photocatalytic activity, which was promisingly applied in various fields

https://iopscience.iop.org/article/10.1088/2053-1591/aade38/pdf

One step to prepare Cl doped porous defect modified g-C3N4 with improved visible-light photocatalytic performance for H2 production and rhodamine B degradation

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g-C3N4 nano-fragments as highly efficient hydrogen evolution photocatalysts: Boosting effect of nitrogen vacancy

Hydrothermal pre-treatment induced cyanamide to prepare porous g-C3N4 with boosted photocatalytic performance

Fabrication of wide visible-light response porous graphitic carbon nitride with excellent visible light photocatalytic performance

One step to prepare Cl doped porous defect modified g-C3N4 with improved visible-light photocatalytic performance for H2 production and rhodamine B degradation