scholarly journals Preparation, Characterization of Graphitic Carbon Nitride Photo-Catalytic Nanocomposites and Their Application in Wastewater Remediation: A Review

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 723
Author(s):  
Caifang Li ◽  
Xianliang Wu ◽  
Junyue Shan ◽  
Jing Liu ◽  
Xianfei Huang
Keyword(s):  
Wastewater Treatment ◽  
Carbon Nitride ◽  
Electronic Energy ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Wastewater Remediation ◽  
Graphite Phase ◽  
Survival And Development ◽  
Physical And Chemical

Energy crisis and environmental pollution are the major problems of human survival and development. Photocatalytic technology can effectively use solar energy and is prospective to solve the above-mentioned problems. Carbon nitride is a two-dimensional polymer material with a graphite-like structure. It has good physical and chemical stabilities, unique chemical and electronic energy band structures, and is widely used in the field of photocatalysis. Graphitic carbon nitride has a conjugated large π bond structure, which is easier to be modified with other compounds. thereby the surface area and visible light absorption range of carbon nitride-based photocatalytic composites can be insignificantly increased, and interface electron transmission and corresponding photogenerated carriers separation of streams are simultaneously promoted. Therefore, the present study systematically introduced the basic catalytic principles, preparation and modification methods, characterization and calculation simulation of carbon nitride-based photocatalytic composite materials, and their application in wastewater treatment. We also summarized their application in wastewater treatment with the aid of artificial intelligence tools. This review summarized the frontier technology and future development prospects of graphite phase carbon nitride photocatalytic composites, which provide a theoretical reference for wastewater purification.

scholarly journals Investigation of Fe-Doped Graphitic Carbon Nitride-Silver Tungstate as a Ternary Visible Light Active Photocatalyst

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Eid H. Alosaimi ◽  
Nadia Azeem ◽  
Noor Tahir ◽  
Asim Jilani ◽  
Muhammad Zahid ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Visible Light ◽  
Metal Oxides ◽  
Advanced Oxidation Processes ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Oxidation Processes ◽  
Visible Light Active ◽  
Silver Tungstate

The rapid population growth and economic development have largely contributed to environmental pollution. Various advanced oxidation processes have been used as the most viable solution for the reduction of recalcitrant pollutants and wastewater treatment. Heterogeneous photocatalysis is one of the broadly used technologies for wastewater treatment among all advanced oxidation processes. Graphitic carbon nitride alone or in combination with various other semiconductor metal oxide materials acts as a competent visible light active photocatalyst for the removal of recalcitrant organic pollutants from wastewater. Rational designing of an environment-friendly photocatalyst through a facile synthetic approach encounters various challenges in photocatalytic technologies dealing with semiconductor metal oxides. Doping in g-C3N4 and subsequent coupling with metal oxides have shown remarkable enhancement in the photodegradation activity of g-C3N4-based nanocomposites owing to the modulation in g-C3N4 bandgap structuring and surface area. In the current study, a novel ternary Fe-doped g-C3N4/Ag2WO4 visible light active photocatalyst was fabricated through an ultrasonic-assisted facile hydrothermal method. Characterization analysis included SEM analysis, FTIR, XRD, XPS, and UV-Visible techniques to elucidate the morphology and chemical structuring of the as-prepared heterostructure. The bandgap energies were assessed using the Tauc plot. The ternary nanocomposite (Fe-CN-AW) showed increased photodegradation efficiency (97%) within 120 minutes, at optimal conditions of pH = 8, catalyst dose = 50 mg/100 ml, an initial RhB concentration of 10 ppm, and oxidant dose 5 mM under sunlight irradiation. The enhanced photodegradation of rhodamine B dye by ternary Fe-CN-AW was credited to multielectron transfer pathways due to insertion of a Fe dopant in graphitic carbon nitride and subsequent coupling with silver tungstate. The data were statistically assessed by the response surface methodology.

scholarly journals Photocatalytic Treatment of Pharmaceuticals in Real Hospital Wastewaters for Effluent Quality Amelioration

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2165 ◽  
Author(s):  
Konstas ◽  
Kosma ◽  
Konstantinou ◽  
Albanis
Keyword(s):  
Mass Spectrometry ◽  
Wastewater Treatment ◽  
Liquid Chromatography ◽  
High Resolution ◽  
Carbon Nitride ◽  
High Resolution Mass Spectrometry ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Hospital Wastewater ◽  
Resolution Mass

The presence of pharmaceutically active compounds (PhACs) in the wastewater effluents has confirmed that conventional wastewater treatment technologies are not sufficiently effective in the pharmaceuticals’ removal. The objective of the present study was to evaluate and compare the photocatalytic degradation of PhACs using TiO2-P25, graphitic carbon nitride (g-C3N4, CN) and a heterojunction of perovskite strodium titanate and graphitic carbon nitride SrTiO3/g-C3N4 (20% g-C3N4, 20CNSTO) photocatalytic materials, in hospital wastewater effluents, by simulated solar irradiation. The experiments were performed by using real wastewater samples collected from the university hospital wastewater treatment plant (WWTP) effluent of Ioannina city (Northwestern Greece) and inherent pharmaceutical concentration levels. The analysis of the samples was accomplished by solid phase extraction followed by liquid chromatography-Orbitrap high-resolution mass spectrometry. In the cases of TiO2 and CN, more than 70% of the initial concentration (e.g., venlafaxine) was degraded after 90 min, while 20CNSTO presented lower photocatalytic performance. Furthermore, some compounds were sporadically detected (e.g., fluoxetine) or their concentrations remained stable during the photocatalytic treatment time period (e.g., trimethoprim). In total 11 transformation products (TPs) were formed along the degradation processes and were identified by using liquid chromatography high resolution mass spectrometry.

scholarly journals Synthesis and Characterization of Graphitic Carbon Nitride Supported Tris(Hydroxymethyl)Aminomethanem) G-C3N4/ THAM) as Novel Catalyst for the Synthesis of Poly Hydroquinoline and Pyranopyrazole Derivatives

2021 ◽  
Author(s):  
Mohammad taghi bagherian jamnani ◽  
Rahimeh Hajinasiri ◽  
Hossein Ghafuri ◽  
Zinatossadat Hossaini
Keyword(s):  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
The Novel ◽  
Reaction Products ◽  
Heterogeneous Catalytic ◽  
Heterogeneous Catalytic System ◽  
Ft Ir ◽  
Novel Catalyst

Abstract Here, an impressive heterogeneous catalytic system, graphitic carbon nitride supported tris(hydroxymethyl)aminomethanem) g-C3N4/ THAM) is presented. The novel g-C3N4/ THAM nanocatalysts was characterized by analyzing methods such as FT-IR, EDX, XRD, TGA, and FESEM. Afterward, the performance of fabricated nanocatalyst g-C3N4/ THAM was suitably investigated in multicomponent reactions (MCRs) for the synthesis of 1,4-dihydropyridine and pyranopyrazole derivatives. By optimizing reported nanocatalyst, the corresponding reaction products were obtained with excellent efficiency and then the reversibility process was exanimated. The g-C3N4/ THAM nanocatalyst is environmentally friendly and was catalyzed the reactions in the presence of ethanol as a green solvent.

Graphitic carbon nitride supported neodymium oxide as an efficient recyclable nanocatalyst for one-pot synthesis of diazabenzo[a]anthraceneones

2021 ◽  
Author(s):  
soraya Rahmatinejad ◽  
Hossein Naeimi
Keyword(s):  
Carbon Nitride ◽  
Neodymium Oxide ◽  
Solvent Free ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
One Pot ◽  
Efficient Catalyst ◽  
Free Condition ◽  
Solvent Free Condition

In this research, neodymium oxide@graphitic-carbon nitride nanocomposite was prepared and used as an efficient catalyst for synthesis of some diazabenzo[a]anthraceneones under solvent-free condition. Characterization of Nd2O3@g-C3N4 nanocomposite was carried out...

Sign in / Sign up

Export Citation Format

Share Document