scholarly journals Site-specific role of bifunctional graphitic carbon nitride catalyst for the sustainable synthesis of 3,3-spirocyclic oxindoles in aqueous media

RSC Advances ◽  
2021 ◽  
Vol 11 (46) ◽  
pp. 28452-28465
Author(s):  
Anshu Dandia ◽  
Dinesh Kumar Mahawar ◽  
Pratibha Saini ◽  
Surendra Saini ◽  
Shyam L. Gupta ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Aqueous Media ◽  
Graphitic Carbon ◽  
Specific Role ◽  
Graphitic Carbon Nitride ◽  
Reusable Catalyst ◽  
One Pot ◽  
Site Specific ◽  
The One

Functionalized graphitic carbon nitride (Sg-C3N4) has been manufactured and used as a reusable catalyst for the one-pot production of various spiro-pyrano chromenes and spiro indole-3,1′-naphthalene tetracyclic systems in aqueous media.

scholarly journals Preparation and characterization of graphitic carbon nitride-supported l-arginine as a highly efficient and recyclable catalyst for the one-pot synthesis of condensation reactions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hossein Ghafuri ◽  
Zeinab Tajik ◽  
Nastaran Ghanbari ◽  
Peyman Hanifehnejad
Keyword(s):  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
The Novel ◽  
One Pot ◽  
Ft Ir ◽  
Quinazoline Derivatives ◽  
The One ◽  
Reaction Media

AbstractIn this work, graphitic carbon nitride-supported l-arginine (g-C3N4@l-arginine) nanocatalyst was synthesized and evaluated using FT-IR, EDX, XRD, TGA, and FESEM analyses. The performance of the prepared nanocatalyst was examined in the synthesis of 1,4-dihydropyridine, 4H-chromene, and 2,3-dihydro quinazoline derivatives. The novel g-C3N4@l-arginine nanocatalyst showed high thermal stability, easy separation from reaction media, the capability to be used in various multicomponent reactions, and acceptable reusability.

scholarly journals A facile and highly efficient transfer hydrogenation of ketones and aldehydes catalyzed by palladium nanoparticles supported on mesoporous graphitic carbon nitride

2019 ◽  
Vol 44 (1-2) ◽  
pp. 14-19
Author(s):  
Bilal Nişancı ◽  
Ziya Dağalan
Keyword(s):  
Carbon Nitride ◽  
Glass Tube ◽  
Pd Nanoparticles ◽  
Graphitic Carbon ◽  
Transfer Hydrogenation ◽  
Graphitic Carbon Nitride ◽  
Reusable Catalyst ◽  
Hydrogenation Reactions ◽  
High Yields ◽  
Benzaldehyde Derivatives

A novel transfer hydrogenation methodology for the reduction of ketones (14 examples) and benzaldehyde derivatives (12 examples) to the corresponding alcohols using Pd nanoparticles supported on mesoporous graphitic carbon nitride (mpg-C3N4/Pd) as a reusable catalyst and ammonia borane as a safe hydrogen source in an aqueous solution MeOH/H2O (v/v = 1/1) is described. The catalytic hydrogenation reactions were conducted in a commercially available high-pressure glass tube at room temperature, and the corresponding alcohols were obtained in high yields in 2–5 min. Moreover, the presented transfer hydrogenation protocol shows partial halogen selectivity with bromo-, fluoro-, and chloro-substituted carbonyl analogs. In addition, the present catalyst can be reused up to five times without losing its efficiency, and scaling-up the reaction enables α-methylbenzyl alcohol to be produced in 90% isolated yield.

A facile and one-pot synthesis of fluorescent graphitic carbon nitride quantum dots for bio-imaging applications

2017 ◽  
Vol 41 (10) ◽  
pp. 3930-3938 ◽  
Author(s):  
Yan Zhan ◽  
Zhiming Liu ◽  
Qingqing Liu ◽  
Di Huang ◽  
Yan Wei ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Thermal Treatment ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
One Pot ◽  
One Pot Synthesis ◽  
Bio Imaging

Ultrathin g-C3N4 nanosheets and fluorescent g-C3N4 quantum dots are simultaneously prepared via one-pot ethanol-thermal treatment in the presence of KOH.

scholarly journals The Role of Graphitic Carbon Nitride in the Formulation of Copper-Free Friction Composites Designed for Automotive Brake Pads

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 123
Author(s):  
Vlastimil Matějka ◽  
Mara Leonardi ◽  
Petr Praus ◽  
Giovanni Straffelini ◽  
Stefano Gialanella
Keyword(s):  
Carbon Nitride ◽  
Room Temperature ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Main Role ◽  
Brake Pads ◽  
Pin On Disc ◽  
Brake Lining ◽  
Automotive Brake

In this study, graphitic carbon nitride (g-C3N4, labelled as gCN) was tested in the formulation of copper-free (Cu-free) friction mixtures, which are potentially interesting for brake pad manufacturing. Three formulations of friction composites were prepared starting from a common Cu-free master batch: (i) without graphite, (ii) with graphite and (iii) with gCN. The mixtures were pressed in the form of pins by hot-press moulding. The friction-wear performance of the prepared pins was investigated using a pin-on-disc (PoD) test at room temperature (RT), high temperature (HT) (400 °C) and, again, at room temperature (H-RT). The values of the friction coefficient (µ) for the composites with gCN (or graphite) were as follows: (i) RT test, µRT = 0.52 (0.47); (ii) HT test, µHT = 0.37 (0.37); (iii) RT after the HT tests, µH-RT = 0.49 (0.39). With respect to wear resistance, the samples with graphite performed better than the samples without this solid lubricant. To the best of our knowledge, this is the first report regarding the evaluation of the role of gCN in friction composites designed for automotive brake lining applications. The results indicate the main role of gCN as a soft abrasive.

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