A review on graphitic carbon nitride (g-C3N4) based hybrid membranes for water and wastewater treatment

2021 ◽  
pp. 148462
Author(s):  
Xiang Li ◽  
Guohe Huang ◽  
Xiujuan Chen ◽  
Jing Huang ◽  
Mengna Li ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Hybrid Membranes ◽  
Water And Wastewater Treatment ◽  
Water And Wastewater

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.

Cobalt-doped graphitic carbon nitride with enhanced peroxidase-like activity for wastewater treatment

RSC Advances ◽  
2016 ◽  
Vol 6 (42) ◽  
pp. 35568-35576 ◽  
Author(s):  
Jianshuai Mu ◽  
Jie Li ◽  
Xin Zhao ◽  
En-Cui Yang ◽  
Xiao-Jun Zhao
Keyword(s):  
Wastewater Treatment ◽  
Carbon Nitride ◽  
Degradation Rate ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Cobalt Doping

The peroxidase-like activity of graphitic carbon nitride (g-C3N4) is dramatically increased by a small cobalt doping. The cobalt-doped g-C3N4 was used for wastewater treatment, exhibiting much higher degradation rate than that of pure g-C3N4.

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 Photocatalytic degradation of anthracene by biochar-based graphitic carbon nitride

2021 ◽  
Vol 1195 (1) ◽  
pp. 012053
Author(s):  
S N Q Syed Abd Halim ◽  
N A M Nazri ◽  
N A H M Nordin
Keyword(s):  
Photocatalytic Degradation ◽  
Carbon Nitride ◽  
Synthesis Temperature ◽  
Graphitic Carbon ◽  
Degradation Efficiency ◽  
Graphitic Carbon Nitride ◽  
Water And Wastewater Treatment ◽  
Biomass Waste ◽  
Initial Concentration ◽  
Living Organisms

Abstract Polycyclic aromatic hydrocarbons (PAHs) are persistent and toxic to living organisms, that can be classified as carcinogenic, mutagenic and teratogenic pollutants. In this study, a green photocatalyst of biochar-based graphitic carbon nitride (BC/g-C3N4-M) is derived from sugarcane bagasse (SB) and melamine were developed as a potential material for the degradation of PAHs. BC(SB)/g-C3N4-M prepared with varied ratios of melamine to SB and different synthesis temperature were characterized by FTIR, BET and UV-DRS. The efficiency of the catalyst for the degradation of anthracene were investigated further in terms of its efficiency at various pH mediums, catalyst dosage and anthracene initial concentration. Experimental results revealed that g-C3N4 showed better degradation efficiency to anthracene than BC(SB)/g-C3N4-M. Additionally, the best degradation efficiency of anthracene by g-C3N4 and BC/g-C3N4-M75% composites were found at pH 3 with 1.0 g/L dosage at 2 ppm and 1 ppm initial concentration, respectively. The catalysts were also discovered to be reusable for 5 cycles with a slight decrease in photocatalytic degradation. The use of agricultural biomass waste in this study could provide a promising approach to water and wastewater treatment.

Sign in / Sign up

Export Citation Format

Share Document