Microporous Carbon Nitride (C₃N_5.4) with Tetrazine based Molecular Structure for Efficient Adsorption of CO₂ and Water

Abstract

Mesoporous carbon nitrides with C3N5 and C3N6 stoichiometries created a new momentum in the field of organic metal‐free semiconductors owing to their unique band structures and high basicity. Here, we report on the preparation of a novel graphitic microporous carbon nitride with a tetrazine based chemical structure and the composition of C3N5.4 using ultra‐stable Y zeolite as the template and aminoguanidine hydrochloride, a high nitrogen‐containing molecule, as the CN precursor. Spectroscopic characterization and density functional theory calculations reveal that the prepared material exhibits a new molecular structure, which comprises two tetrazines and one triazine rings in the unit cell and is thermodynamically stable. The resultant carbon nitride shows an outstanding surface area of 130.4 m2 g−1 and demonstrates excellent CO2 adsorption per unit surface area of 47.54 μmol m−2, which is due to the existence of abundant free NH2 groups, basic sites and microporosity. The material also exhibits highly selective sensing over water molecules (151.1 mmol g−1) and aliphatic hydrocarbons due to its unique microporous structure with a high amount of hydrophilic nitrogen moieties and recognizing ability towards small molecules.

Anti‐Stoke effect induced enhanced photocatalytic hydrogen production

“…The two broad peaks centered at 9.8° and 14.1° indicate that the prepared MoS 2 QDs coexist as both 1 T and 2H phases 35 . The XRD pattern of pure SCCN650 shows its unique peaks centered at 8.2° and 14.3°, which matches the previously reported result 6 . After the heterostructure construction, the peak intensity of MSCCN1, 2.5, 5, and 10 at 8.2° and 14.3° were decreased dramatically.…”

“…35 The XRD pattern of pure SCCN650 shows its unique peaks centered at 8.2°and 14.3°, which matches the previously reported result. 6 After the heterostructure construction, the peak intensity of MSCCN1, 2.5, 5, and It can be seen from Figure 2A, that with the increased loading weight of MoS 2 QDs from sample MSCCN1 to sample MSCCN10, the peak at 8.2°becomes broader, and the peak at 14.3°gradually disappears, which is associated with the incorporation of MoS 2 QDs. A new peak emerges at 32.8°in samples MSCCN5 and MCN10, which attributes to the annealed MoS 2 QDs.…”

Grafting of the gold surface by heterocyclic moieties derived through electrochemical oxidation of amino triazole – an experimental and “ab initio” study

“…The C 1s component at 287.8 eV is ascribed to carbon attached to the nitrogen group (N C–N) in the triazole ring (13.96 ≈ 14 at%) 26 (after deducting the percentage of impurity). In conclusion, the ratio of nitrogen/carbon in the ring is approximately 4 to 2, following the atomic percentage of (≈29 at%) N with (≈14 at%) C.…”

Tuning the electronic, magnetic, and sensing properties of a single atom embedded microporous C3N6 monolayer towards XO2 (X = C, N, S) gases

“…A group of researchers reported the preparation of a novel graphitic microporous CN with a tetrazine based chemical structure and a composition of C 3 N 5.4 using the ultra-stable Y zeolite as the template and aminoguanidine hydrochloride, a N-rich molecule, as the CN precursor. 23 The resultant CN shows an outstanding surface area of 130.4 m 2 g À1 and demonstrates excellent CO 2 adsorption per unit surface area of 47.54 mmol m 2 due to porosity. This is the highest ever reported value among the mesoporous CNs and the activated carbon.…”

“…Functionalization and doping techniques are well known to alter the chemical properties of pristine 2D materials to enhance their response towards various gases. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] The gas sensing mechanism of metal-graphene systems was investigated in an earlier study. 27 The results were useful to effectively embed a metal adatom on a graphene layer.…”