Facile synthesis of Y-doped graphitic carbon nitride with enhanced photocatalytic performance

Wang, Yangang; Li, Yaguang; Bai, Xia; Cai, Qing; Liu, Chenglu; Zuo, Yuanhui; Kang, Shifei; Cui, Lifeng

doi:10.1016/j.catcom.2016.06.020

Cited by 62 publications

(36 citation statements)

References 30 publications

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“…Tungsten doped porous g-C 3 N 4 was synthesized by hydrothermal method using urea, dicyandiamide and Na 2 WO 4 .2H 2 O as precursors and catalysts with varying molar ratios of precursors were prepared and the catalyst W5/PGCN (P stands for porous) gave the highest photocatalytic activity due to separation of charges and shown 99.6% degradation of MO under visible light (λ = 400-420 nm) for the irradiation time of 60 min and 100% in 70 min [124]. Beside W, other transition metals like Yttrium ( [125]), Iron [126], Eu, Zr [17], etc. doped gCN for the increased photocatalytic activity has also been reported in literature.…”

Section: Schematic Illustration Of Positions Of Non-metals As Dopantsmentioning

confidence: 99%

Semiconductor Nanocomposites for Visible Light Photocatalysis of Water Pollutants

Imtiaz¹,

Rashid²,

Xu³

2019

Concepts of Semiconductor Photocatalysis

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Semiconductor photocatalysis gained reputation in the early 1970s when Fujishima and Honda revealed the potential of TiO 2 to split water in to hydrogen and oxygen in a photoelectrochemical cell. Their work provided the base for the development of semiconductor photocatalysis for the environmental remediation and energy applications. Photoactivity of some semiconductors was found to be low due to larger band gap energy and higher electron-hole pair recombination rate. To avoid these problems, the development of visible light responsive photocatalytic materials by different approaches, such as metal and/or non-metal doping, codoping, coupling of semiconductors, composites and heterojunctions materials synthesis has been widely investigated and explored in systematic manner. This chapter emphasizes on the different type of tailored photocatalyst materials having the enhanced visible light absorption properties, lower band gap energy and recombination rate of electron-hole pairs and production of reactive radical species. Visible light active semiconductors for the environmental remediation purposes, particularly for water treatment and disinfection are also discussed in detail. Studies on the photocatalytic degradation of emerging organic compounds like cyanotoxins, VOCs, phenols, pharmaceuticals, etc., by employing variety of modified semiconductors, are summarized, and a mechanistic aspects of the photocatalysis has been discussed.

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Section: Schematic Illustration Of Positions Of Non-metals As Dopantsmentioning

confidence: 99%

Semiconductor Nanocomposites for Visible Light Photocatalysis of Water Pollutants

Imtiaz¹,

Rashid²,

Xu³

2019

Concepts of Semiconductor Photocatalysis

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“…3.5. Synthesis of 1,1-di(p-anisyl)ethylene (5) Alkene 5 was prepared by the following method: in a solution of bis(4-methoxyphenyl)methanone (0.87 g, 3.6 mmol) in dry THF (40 mL), MeLi (2 mL) was added at 0 • C. After 24 h the reaction mixture was quenched with a few drops of H 2 O. The reaction mixture was acidified with 3N HCl, and washed with NH 4 Cl and H 2 O solutions.…”

Section: Synthesis Of 2-(4-methoxyphenyl)-3-methylbut-2-ene (4)mentioning

confidence: 99%

“…The relatively low band gap energy Eg of 2.7 eV and high conduction and valence bond positions of the photocatalyst [4] prompted many research groups to improve the photocatalytic activity of g-C 3 N 4 . This was achieved by doping the surface of the catalyst with a variety of metallic elements [3,[5][6][7][8][9][10][11], oxides [12,13], sulfides [14] even graphene [15] and carbon nanotubes [16].…”

Section: Introductionmentioning

confidence: 99%

Surface-Doped Graphitic Carbon Nitride Catalyzed Photooxidation of Olefins and Dienes: Chemical Evidence for Electron Transfer and Singlet Oxygen Mechanisms

et al. 2019

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A new photocatalytic reactivity of carbon-nanodot-doped graphitic carbon nitride (CD-C3N4) with alkenes and dienes, has been disclosed. We have shown that CD-C3N4 photosensitizes the oxidation of unsaturated substrates in a variety of solvents according to two competing mechanisms: the energy transfer via singlet oxygen (1O2) and/or the electron transfer via superoxide (O·−2). The singlet oxygen, derived by the CD-C3N4 photosensitized process, reacts with alkenes to form allylic hydroperoxides (ene products) whereas with dienes, endoperoxides. When the electron transfer mechanism operates, cleavage products are formed, derived from the corresponding dioxetanes. Which of the two mechanisms will prevail depends on solvent polarity and the particular substrate. The photocatalyst remains stable under the photooxidation conditions, unlike the most conventional photosensitizers, while the heterogeneous nature of CD-C3N4 overcomes usual solubility problems.

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“…g-C 3 N 4 , a non-metal semiconductor with a grapheme-like layered structure that was successfully used in split water and degrade organic contaminants under visible light irradiation [28]. Nevertheless, their photocatalytic performance was limited for bare bulk structure [29,30,31]. Hence, much research has been conducted to improve their photolytic activity, such as preparing ultrathin MoS 2 nanosheets and exfoliating thick g-C 3 N 4 into few layers nanosheets.…”

Section: Introductionmentioning

confidence: 99%

A Novel Route to Manufacture 2D Layer MoS2 and g-C3N4 by Atmospheric Plasma with Enhanced Visible-Light-Driven Photocatalysis

et al. 2019

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An atmospheric plasma treatment strategy was developed to prepare two-dimensional (2D) molybdenum disulfide (MoS2) and graphitic carbon nitride (g-C3N4) nanosheets from (NH4)2MoS4 and bulk g-C3N4, respectively. The moderate temperature of plasma is beneficial for exfoliating bulk materials to thinner nanosheets. The thicknesses of as-prepared MoS2 and g-C3N4 nanosheets are 2–3 nm and 1.2 nm, respectively. They exhibited excellent photocatalytic activity on account of the nanosheet structure, larger surface area, more flexible photophysical properties, and longer charge carrier average lifetime. Under visible light irradiation, the hydrogen production rates of MoS2 and g-C3N4 by plasma were 3.3 and 1.5 times higher than the corresponding bulk materials, respectively. And g-C3N4 by plasma exhibited 2.5 and 1.3 times degradation rates on bulk that for methyl orange and rhodamine B, respectively. The mechanism of plasma preparation was proposed on account of microstructure characterization and online mass spectroscopy, which indicated that gas etching, gas expansion, and the repulsive force of electron play the key roles in the plasma exfoliation. Plasma as an environmentally benign approach provides a general platform for fabricating ultrathin nanosheet materials with prospective applications as photocatalysts for pollutant degradation and water splitting.

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Facile synthesis of Y-doped graphitic carbon nitride with enhanced photocatalytic performance

Cited by 62 publications

References 30 publications

Semiconductor Nanocomposites for Visible Light Photocatalysis of Water Pollutants

Semiconductor Nanocomposites for Visible Light Photocatalysis of Water Pollutants

Surface-Doped Graphitic Carbon Nitride Catalyzed Photooxidation of Olefins and Dienes: Chemical Evidence for Electron Transfer and Singlet Oxygen Mechanisms

A Novel Route to Manufacture 2D Layer MoS2 and g-C3N4 by Atmospheric Plasma with Enhanced Visible-Light-Driven Photocatalysis

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