scholarly journals Progress in Photocatalysis of g-C3N4 and its Modified Compounds

2021 ◽  
Vol 233 ◽  
pp. 01114
Author(s):  
Yanling Wu ◽  
Yanmin Wang ◽  
Miantuo Li
Keyword(s):  
Environmental Remediation ◽  
Carbon Nitride ◽  
Electronic Band Structure ◽  
Low Cost ◽  
Sustainable Utilization ◽  
Electronic Band ◽  
Semiconductor Electronic ◽  
Visible Light Active ◽  
Metallic Catalyst ◽  
Splitting Water

Recently, graphitic carbon nitride (g-C3N4), a polymeric semiconductorhas been widely used as a low-cost, stable, and metal-free visible-light-active photocatalyst in the sustainable utilization of solar energy, such as water splitting, organic photosynthesis, and environmental remediation, which has attracted world wide attention from energy and environmental relative fields. Base on analysis of structure and theoretical calculation, the reasons that g-C3N4 can be used as a non-metallic catalyst were discussed in this paper. Some group's research jobs that metal-supported g-C3N4, metal-supported g-C3N4/organnic semiconductor compound and heterogeneous junction adjust the semiconductor electronic band structure have been summarized. And the mechanism, effect factors, and research developments on the reaction of organic degradation by photocatalytic and splitting water for hydrogen revolution catalyzed by above-mentioned modified g-C3N4 were emphatically analyzed. Finally, the prospects for the development of highly efficient g-C3N4 based photocatalysts are also discussed.

scholarly journals Graphitic Carbon Nitride for Photocatalytic Air Treatment

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3038
Author(s):  
Michal Baudys ◽  
Šárka Paušová ◽  
Petr Praus ◽  
Vlasta Brezová ◽  
Dana Dvoranová ◽  
...  
Keyword(s):  
Uv Irradiation ◽  
Environmental Remediation ◽  
Carbon Nitride ◽  
Electronic Band Structure ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Paramagnetic Resonance ◽  
Electronic Band ◽  
Acetaldehyde Oxidation ◽  
Earth Abundant

Graphitic carbon nitride (g-C3N4) is a conjugated polymer, which recently drew a lot of attention as a metal-free and UV and visible light responsive photocatalyst in the field of solar energy conversion and environmental remediation. This is due to its appealing electronic band structure, high physicochemical stability and earth-abundant nature. In the present work, bulk g-C3N4 was synthesized by thermal decomposition of melamine. This material was further exfoliated by thermal treatment. S-doped samples were prepared from thiourea or further treatment of exfoliated g-C3N4 by mesylchloride. Synthesized materials were applied for photocatalytic removal of air pollutants (acetaldehyde and NOx) according to the ISO 22197 and ISO 22197-1 methodology. The efficiency of acetaldehyde removal under UV irradiation was negligible for all g-C3N4 samples. This can be explained by the fact that g-C3N4 under irradiation does not directly form hydroxyl radicals, which are the primary oxidation species in acetaldehyde oxidation. It was proved by electron paramagnetic resonance (EPR) spectroscopy that the dominant species formed on the irradiated surface of g-C3N4 was the superoxide radical. Its production was responsible for a very high NOx removal efficiency not only under UV irradiation (which was comparable with that of TiO2), but also under visible irradiation.

Electronic and Mechanical Coupling in Elastically Bent ZnO Micro/Nanowires

2014 ◽  
Vol 1664 ◽  
Author(s):  
Xuewen Fu ◽  
Zhimin Liao ◽  
Dapeng Yu
Keyword(s):  
Elastic Strain ◽  
Electronic Band Structure ◽  
Coupling Effect ◽  
Low Cost ◽  
Chemical Properties ◽  
Strain Engineering ◽  
Near Band Edge ◽  
Engineering Strain ◽  
Electronic Band ◽  
Mechanical Coupling

ABSTRACTElastic engineering strain has been regarded as a low-cost and continuously variable manner for altering the physical and chemical properties of materials, and it becomes even more important at low-dimensionality because at micro/nanoscale, materials/structures can usually bear exceptionally high elastic strains before failure. The elastic strain effects are therefore greatly magnified in micro/nanoscale structures and should be of great potential in the design of novel functional devices. The purpose of this overview is to present a summary of our recently progress in the energy band engineering of elastically bent ZnO micro/nanowires. First, we present the electronic and mechanical coupling effect in bent ZnO nanowires. Second, we summary the bending strain gradient effect on the near-band-edge (NBE) emission photon energy of bent ZnO micro/nanowires. Third, we show that the strain can induce exciton fine-structure splitting and shift in ZnO microwires. Our recent progresses illustrate that the electronic band structure of ZnO micro/nanowires can be dramatically tuned by elastic strain engineering, and point to potential future applications based on the elastic strain engineering of ZnO micro/nanowires.

scholarly journals Hydrogenated Amorphous TiO2−x and Its High Visible Light Photoactivity

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2801
Author(s):  
Guang Feng ◽  
Mengyun Hu ◽  
Shuai Yuan ◽  
Junyi Nan ◽  
Heping Zeng
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Rhodamine B ◽  
Environmental Remediation ◽  
Density Functional ◽  
Electronic Band Structure ◽  
Ros Generation ◽  
Electronic Band ◽  
Amorphous Tio2 ◽  
Hydrogenated Amorphous

Hydrogenated crystalline TiO2 with oxygen vacancy (OV) defect has been broadly investigated in recent years. Different from crystalline TiO2, hydrogenated amorphous TiO2−x for advanced photocatalytic applications is scarcely reported. In this work, we prepared hydrogenated amorphous TiO2−x (HA-TiO2−x) using a unique liquid plasma hydrogenation strategy, and demonstrated its highly visible-light photoactivity. Density functional theory combined with comprehensive analyses was to gain fundamental understanding of the correlation among the OV concentration, electronic band structure, photon capturing, reactive oxygen species (ROS) generation, and photocatalytic activity. One important finding was that the narrower the bandgap HA-TiO2−x possessed, the higher photocatalytic efficiency it exhibited. Given the narrow bandgap and extraordinary visible-light absorption, HA-TiO2−x showed excellent visible-light photodegradation in rhodamine B (98.7%), methylene blue (99.85%), and theophylline (99.87) within two hours, as well as long-term stability. The total organic carbon (TOC) removal rates of rhodamine B, methylene blue, and theophylline were measured to 55%, 61.8%, and 50.7%, respectively, which indicated that HA-TiO2−x exhibited high wastewater purification performance. This study provided a direct and effective hydrogenation method to produce reduced amorphous TiO2−x which has great potential in practical environmental remediation.

Soft-chemistry Route to P-I-N Heterostructured Quantum Dot Electroluminescence Device: All Solution-processed Polymer-Inorganic Hybrid QD-EL Device

2006 ◽  
Vol 959 ◽  
Author(s):  
Soon-Jae Kwon ◽  
Kyung-Sang Cho ◽  
Byoung-Lyong Choi ◽  
Byung-Ki Kim
Keyword(s):  
Quantum Dot ◽  
Electronic Band Structure ◽  
Low Cost ◽  
Sol Gel ◽  
Device Structure ◽  
Electronic Band ◽  
Solution Processed ◽  
Turn On ◽  
Ito Glass ◽  
Polymer Semiconductor

ABSTRACTp-i-n heterostructured quantum-dot electroluminescence (QD-EL) device was fabricated by soft-chemical process, which shows a low turn-on voltage comparable to OLEDs. To construct the multilayered device structure, p-type polymer semiconductor was deposited on the ITO glass by sequential process of coating and thermal curing, thereupon a few monolayers of QD was spin-coated. n-type metal-oxide film was deposited on top of the QD luminescence layer by sol-gel method, providing a facile and low-cost route for the ETL fabrication. Prior to solution-processed ETL construction, a post-treatment is performed using cross-linking agent, in order to chemically-immobilize the QDs. As a cathodic electrode, relatively air-stable aluminum was deposited. The constituent material as well as the electronic band structure of the integrated device guarantees operating stability in air and low turn-on voltage.

scholarly journals Graphitic Carbon Nitride as a New Sustainable Photocatalyst for Textile Functionalization

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2568
Author(s):  
Jelena Vasiljević ◽  
Ivan Jerman ◽  
Barbara Simončič
Keyword(s):  
Environmental Remediation ◽  
Carbon Nitride ◽  
Low Cost ◽  
Research Area ◽  
Graphitic Carbon ◽  
Water Disinfection ◽  
Graphitic Carbon Nitride ◽  
Textile Functionalization ◽  
Energy Conversion And Storage ◽  
Flame Retardant Properties

As a promising organic semiconducting material, polymeric graphitic carbon nitride (g-C3N4) has attracted much attention due to its excellent optical and photoelectrochemical properties, thermal stability, chemical inertness, nontoxicity, abundance, and low cost. Its advantageous visible light-induced photocatalytic activity has already been beneficially used in the fields of environmental remediation, biological applications, healthcare, energy conversion and storage, and fuel production. Despite the recognized potential of g-C3N4, there is still a knowledge gap in the application of g-C3N4 in the field of textiles, with no published reviews on the g-C3N4- functionalization of textile materials. Therefore, this review article aims to provide a critical overview of recent advances in the surface and bulk modification of textile fibres by g-C3N4 and its composites to tailor photocatalytic self-cleaning, antibacterial, and flame retardant properties as well as to create a textile catalytic platform for water disinfection, the removal of various organic pollutants from water, and selective organic transformations. This paper highlights the possibilities of producing g-C3N4-functionalized textile substrates and suggests some future prospects for this research area.

Improving the photocatalytic activity of s-triazine based graphitic carbon nitride through metal decoration: an ab initio investigation

2016 ◽  
Vol 18 (38) ◽  
pp. 26466-26474 ◽  
Author(s):  
K. Srinivasu ◽  
Brindaban Modak ◽  
Swapan K. Ghosh
Keyword(s):  
Photocatalytic Activity ◽  
Density Functional ◽  
Carbon Nitride ◽  
Electronic Band Structure ◽  
Density Functional Theory Calculations ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Electronic Band ◽  
Solar Water Splitting ◽  
Metal Decoration

Through density functional theory calculations, we attempted to tune the electronic band structure of poly s-triazine based graphitic carbon nitride by decorating it with different metal atoms and clusters for improving its photocatalytic activity towards solar water splitting.

scholarly journals Materials synthesis, characterization and DFT calculations of the visible-light-active perovskite-like barium bismuthate Ba1.264(4)Bi1.971(4)O4 photocatalyst

2020 ◽  
Vol 8 (10) ◽  
pp. 3509-3519 ◽  
Author(s):  
D. S. Shtarev ◽  
A. V. Shtareva ◽  
R. Kevorkyants ◽  
A. V. Rudakova ◽  
M. S. Molokeev ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Band Structure ◽  
Dft Calculations ◽  
Visible Light ◽  
Density Of States ◽  
Electronic Band Structure ◽  
Materials Synthesis ◽  
Electronic Band ◽  
Visible Light Active

The crystal structure of the Ba1.264(4)Bi1.971(4)O4 perovskite-like system and associated electronic band structure and density of states.

Hydrogen production via water splitting over graphitic carbon nitride (g-C3N4 )-based photocatalysis

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohammed Ismael
Keyword(s):  
Hydrogen Production ◽  
Environmental Remediation ◽  
Carbon Nitride ◽  
Low Cost ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Future Research ◽  
Renewable Hydrogen ◽  
Nonmetal Doping

Abstract Photocatalytic splitting of water into hydrogen and oxygen using semiconductor photocatalysts and light irradiation has been attracted much attention and considered to be an alternative for nonrenewable fossil fuel to solve environmental problems and energy crisis and also an as promising approach to produce clean, renewable hydrogen fuel. Owing to their various advantages such as low cost and environmental friendly, chemical, and thermal stability, appropriate band structure, graphitic carbon nitride (g-C3N4 ) photocatalysts have gained multitudinous attention because of their great potential in solar fuels production and environmental remediation. However, due to its fast charge carrier’s recombination, low surface, and limited absorption of the visible light restrict their activity toward hydrogen evolution and numerous modification techniques were applied to solve these problems such as structural modification, metal/nonmetal doping, and noble metal loading, and coupling semiconductors. In this chapter, we summarize recent progress in the synthesis and characterization of the g-C3N4-based photocatalyst. Several modification methods used to enhance the photocatalytic hydrogen production of g-C3N4-based photocatalyst were also highlighted. This chapter ends with the future research and challenges of hydrogen production over g-C3N4-based photocatalyst.

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