Acid–base behavior of an oligomer of 3‐amino‐1,2,4‐triazole

Lamanna, Melisa Elsa; Horra, Enrique de la; Sanabria, Juan; Jacobo, Silvia E.; D’Accorso, Norma B.

doi:10.1002/app.34650

Cited by 7 publications

(4 citation statements)

References 12 publications

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“…A strong signal at 1425 cm −1 indicates the ring breathing modes of triazole nucleus whereas the absorption in the range 1270–1300 cm −1 is due to the secondary aromatic amines and C−N bonding (Figure S2). The strong bands in 1000 −700 cm −1 region are the finger prints of N‐H out‐of‐plane bending vibrations and (ω‐NH) vibrations . It is well accepted that the triazole nucleus is very stable even at high temperatures and thus attached amino group at position 3 of 3‐AT is thought to be involved in the cross‐linking with other molecules.…”

Section: Figurementioning

confidence: 99%

Highly Ordered Nitrogen‐Rich Mesoporous Carbon Nitrides and Their Superior Performance for Sensing and Photocatalytic Hydrogen Generation

et al. 2017

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Mesoporous carbon nitrides (MCN) are fascinating materials with unique semiconducting and basic properties that are useful in many applications including photocatalysis and sensing. Most syntheses of MCN focus on creating theoretically predicted C 3 N 4 stoichiometry with ab and gap of 2.7 eV using an ano-hardt emplating approach with triazine-based precursors.However,the performance of the MCN in semiconducting applications is limited to the MCN framework with as mall band gap,whichwould be linked with the addition of more N in the CN framework, but this remains ahuge challenge.Here, we report ap recursor with high nitrogen content, 3-amino-1,2,4-triazole,t hat enables the formation of new and wellordered 3D MCN with C 3 N 5 stoichiometry (MCN-8), which has not been predicted so far,a nd al ow-band-gape nergy (2.2 eV). This novel class of material without addition of any dopants shows not only as uperior photocatalytic watersplitting performance with at otal of 801 mmol of H 2 under visible-light irradiation for 3h but also excellent sensing properties for toxic acids.Carbon nitrides (CN) are of particular importance because of their unique properties such as high bulk moduli, low density,high thermal conductivity,semiconductivity,biocompatibility,a nd tunability of band gaps.[1] These properties make them special and help to advance their performance in various applications including adsorption, gas storage,photocatalysis,e nergy storage,a nd sensing.[2-4] However,t he efficiency of these materials in the above applications is related to their crystal structure,p orosity,a nd most importantly the nitrogen content in the CN framework. The porosity in CN was first realized by Vinu et al. who used the hard templating approach for creating CN with ahigh specific surface area and remarkable pore structures. [5,6] These materials suffer from poor nitrogen content due to al ow thermodynamic stability of Ni nt he carbon framework at ahigh temperature,which limits their performance in various applications.T his triggers various research groups to develop different preparation routes for porous CN by annealing the precursors with high nitrogen content at ahigh temperature. Forexample,non-porous graphitic C 3 N 4 has been prepared by using different Nrich precursors such as cyanamide,thiourea, ammonium thiocyanate,m elamine,u rea, and cyanuric chloride.[4] On the other hand, mesoporous carbon nitrides (MCN) can be prepared by anano-hard templating approach using nitrogen-containing precursors such as triazine or cyanamide or guanidine. [7][8][9][10] Then itrogen content of these materials are limited to the C/N ratio higher than 0.75 (C 3 N 4 ), which generally provides CN walls with triazine network. [11,12] In contrast to MCN with the stoichiometry of C 3 N 4 ,MCN with C 3 N 5 framework has not been synthesized as it is challenging and requires modification of the CN framework structure in order to introduce more nitrogen into the triazine network. MCN with C 3 N 5 and well-ordered porous structure could sign...

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Section: Figurementioning

confidence: 99%

Highly Ordered Nitrogen‐Rich Mesoporous Carbon Nitrides and Their Superior Performance for Sensing and Photocatalytic Hydrogen Generation

et al. 2017

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“…Although, melamine and urea are the cheapest commercial precursors for CNs preparation, using more complex but easily accessible molecules, such as 3‐amino‐1,2,4‐triazole oligomer, [54] can be beneficial to transfer morphology of the precursor to the final CN via the ‘topotactic‐like’ phase transition as has been shown by Dontsova et al [55] …”

Section: Introductionmentioning

confidence: 99%

Emerging Concepts in Carbon Nitride Organic Photocatalysis

Mazzanti

Savateev

2020

ChemPlusChem

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Carbon nitrides encompass a class of transition-metal-free materials possessing numerous advantages such as low cost (few Euros per gram), high chemical stability, broad tunability of redox potentials and optical bandgap, recyclability, and a high absorption coefficient (> 10 5 cm À 1), which make them highly attractive for application in photoredox catalysis. In this Review, we classify carbon nitrides based on their unique properties, structure, and redox potentials. We summarize recently emerging concepts in heterogeneous carbon nitride photocatalysis, with an emphasis on the synthesis of organic compounds: 1) Illumination-Driven Electron Accumulation in Semiconductors and Exploitation (IDEASE); 2) singlet-triplet intersystem crossing in carbon nitride excited states and related energy transfer; 3) architectures of flow photoreactors; and 4) dual metal/carbon nitride photocatalysis. The objective of this Review is to provide a detailed overview regarding innovative research in carbon nitride photocatalysis focusing on these topics.

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“…As observed in Figure a, the survey spectra of the ZASCN-3 indicated the existence of Zn, Al, S, C, and N elements, reflecting the coexistence of CN and ZAS in the composites and thus demonstrating the combination of ZAS and CN. As seen in Figure b, the C 1s spectra of CN were deconvoluted into three typical peaks at 284.2, 285.7, and 287.6 eV, attributing to adventitious carbon, N–CN coordination (tri- s -triazine ring), and C–NH 2 on the edge of heptazine units, respectively. − Moreover, compared to bare CN, the increased signals of the above three peaks at 284.4 eV (indefinite carbon), 286.1 eV (N–CC), and 287.8 eV (C–NH 2 ) in the ZASCN-3 hybrid heterojunction were identified and ascribed to strong chemical and electronic interaction between CN and ZAS. Furthermore, the increase of binding energy (BE) provided evidence that the introduction of ZAS affects the CN electronic energy distribution through coupling interplay, which results from decreased electronic density and the weakened electronic screening effect .…”

Section: Resultsmentioning

confidence: 98%

Designing and Fabricating a Vulcanized ZnAl LDH-Modified g-C₃N₄ Heterojunction for Enhanced Visible-Light-Driven Photocatalytic Degradation Activity

Zhao

et al. 2022

Ind. Eng. Chem. Res.

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Modulation of the structure and composition of a binary heterojunction can skillfully transfer photoinduced charge carriers and perfectly boost the photodegradation performance of pollutants in wastewater under a 300 W Xe lamp illumination. Herein, a novel binary heterojunction ZnAlS x @g-C3N4 with different load proportions of ZnAlS x was perfectly constructed by readily hydrothermal treatment and characterized experimentally by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, UV–vis spectroscopy, diffuse reflectance spectroscopy, photoluminescence, and so forth. The photodegradation performance of tetracycline (TC) by prepared ZnAlS x @g-C3N4 was measured under various photocatalytic conditions, including TC pollutant concentration, catalyst dosage, pH values, and competing ions in the photocatalytic system. The results suggested that the ZASCN-3 (30 wt % of ZAS compared to CN) composites exhibited the best photodegradation activity (94.05%), with h+ as the primary active substance and O2 •– as the second-most important substance, which was over 2.2 and 5.0 orders of degradation rate higher than pure ZAS and CN, respectively. The improved photocatalytic ability of ZASCN composites was put down to intimate contact interfaces between ZAS and CN and Z-scheme electron–hole pairs induced, which were sped up by the efficient separation of photogenerated carriers. In addition, the ZASCN-3 composites exhibited an outstanding stable photodegradation activity based on the cycling test and the superior widespread applicability toward other pollutants, including dyes, antibiotics, and environmental water. The plausible Z-scheme photocatalytic mechanism for TC degradation over the ZASCN hybrid was surmised according to the trapping experiments.

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Acid–base behavior of an oligomer of 3‐amino‐1,2,4‐triazole

Cited by 7 publications

References 12 publications

Highly Ordered Nitrogen‐Rich Mesoporous Carbon Nitrides and Their Superior Performance for Sensing and Photocatalytic Hydrogen Generation

Highly Ordered Nitrogen‐Rich Mesoporous Carbon Nitrides and Their Superior Performance for Sensing and Photocatalytic Hydrogen Generation

Emerging Concepts in Carbon Nitride Organic Photocatalysis

Designing and Fabricating a Vulcanized ZnAl LDH-Modified g-C₃N₄ Heterojunction for Enhanced Visible-Light-Driven Photocatalytic Degradation Activity

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Acid–base behavior of an oligomer of 3‐amino‐1,2,4‐triazole

Cited by 7 publications

References 12 publications

Highly Ordered Nitrogen‐Rich Mesoporous Carbon Nitrides and Their Superior Performance for Sensing and Photocatalytic Hydrogen Generation

Highly Ordered Nitrogen‐Rich Mesoporous Carbon Nitrides and Their Superior Performance for Sensing and Photocatalytic Hydrogen Generation

Emerging Concepts in Carbon Nitride Organic Photocatalysis

Designing and Fabricating a Vulcanized ZnAl LDH-Modified g-C3N4 Heterojunction for Enhanced Visible-Light-Driven Photocatalytic Degradation Activity

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Designing and Fabricating a Vulcanized ZnAl LDH-Modified g-C₃N₄ Heterojunction for Enhanced Visible-Light-Driven Photocatalytic Degradation Activity