Hydrogen-bond supramolecular hydrogels as efficient precursors in the preparation of freestanding 3D carbonaceous architectures containing BCNO nanocrystals and exhibiting a high CO2/CH4 adsorption ratio

Abstract

Oxygen-enriched boron carbonitrides -known as boron carbon oxinitrides, BCNOshave exhibited remarkable properties with numerous works reporting on their performance as phosphors and some few ones as H 2 -adsorbents. However, the study of BCNOs capability for CO 2 uptaking has yet to be achieved. Herein, we have designed a simple process for preparation of freestanding three-dimensional (3D) BCNO structures via pyrolysis of supramolecular gels formed by H-bonding of melamine, boric acid and glucose. The 3D porous materials obtained by pyrolysis of supramolecular gels containing glucose exhibited a seaweed-like 3D structure formed by BCNO nanocrystals embedded within a carbonaceous matrix with a certain content of amorphous hydrogenated carbon. The particularly narrow porosities exhibited by these samples proved effective for CO 2 adsorption with uptakes of up to ca. 2 mmol/g at 25 °C. More interestingly, those samples prepared with high concentration of glucose behaved as molecular sieves and exhibited an excellent performance for CO 2 -CH 4 separation, especially at low pressures with k H values of up to 1.04•10 3 . M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 29 Ma, R.; Bando, Y.; Sato, T.; Kurashima, K. Growth, Morphology, and Structure of Boron Nitride Nanotubes, Chem. Mater. 2001, 13, 2965−2971 30 Zhang, X.; Lu, Z.; Lin, J.; Li, L.; Fan, Y.; Hu, L.; Xu, X.; Meng, F.; Zhao, J.; Tang, C. Luminescence properties of BCNO phosphor prepared by a green and simple method, Mater. Lett. 2013, 194, 72-75 31 Estroff, L. A.; Hamilton, A. D. Water Gelation by Small Organic Molecules, Chem. Rev. 2004, 104, 1201-1217 32 Zhang, S.; Dokko, K.; Watanabe, M. Carbon materialization of ionic liquids: from solvents to materials, Mater. Horiz. 2015, 2, 168-197

Hydrogen Peroxide-Assisted Ultrasonic Synthesis of BCNO QDs for Anthrax Biomarker Detection

“…The N 1s spectrum revealed three peaks centered at 398.4, 400.0, and 401.0 eV, which corresponded to N–B, CN, and C–NH bonds. The O 1s spectrum showed two peaks centered at 531.9 and 532.8 eV, which were assigned to O–B and O–C bonds. ,, All the above results verified that the BCNO QDs maintained the typical characteristics of the bulk BCNO. The hydrated ionic radius of the BCNO QDs is ∼28 nm, indicating a good dispersibility in aqueous (Figure S8).…”

“…As shown in Figure C, two strong bands at 780 and 1385 cm –1 were ascribed to the in-plane stretching and out-of-plane bending vibrations of h-BN. The absorption bands at 925, 1024, and 1100 cm –1 were attributed to N–B–O, B–O–B, and B–O bonds, whereas the abroad absorption bands around 1200–1600 cm –1 corresponded to B–N and C–N bonds. ,,, In addition, the absorption bands at 3217 and 3373 cm –1 were assigned to N–H and O–H bands. , The XPS spectrum showed that the BCNO QDs consisted of B, C, N, and O elements with a corresponding atomic ratio of 0.274:0.273:0.247:0.206 (Figure S7). The B 1s spectrum displayed three peaks centered at 190.0, 190.9, and 192.4 eV, which were ascribed to B–C, B–N, and B–O bonds, respectively.…”

Metal-Free Modified Boron Nitride for Enhanced CO2 Capture

“…It is well-known that higher microporosity provides more active sites and storage space to boost the adsorption performances [36][37][38]. To the best of our knowledge, the result of the synthetic method is higher than other modification methods such as (3D) BCNO structure (1.8 mmol/g) at 298 K as reported by Lopez-Salas et al [39] and closer to porous BCN (2.49 mmol/g) at 298 K and porous BN fiber (2.85 mmol/g) at 273 K [40,41]. However, the use of melamine in porous BCN as well as BN fiber leads to the presence of carbon content and consequently decreases the stability upon exposure to ambient air.…”

Photo‐ and pH‐ Dual‐Responsive β‐Cyclodextrin‐Based Supramolecular Prodrug Complex Self‐Assemblies for Programmed Drug Delivery

“…Currently,noncovalent interactions, such as host-guest interactions, [17][18][19][20] hydrogen-bonding interactions, [21][22][23] and metalligand coordination, [24,25] have been utilized to construct various supramolecular complexes (SCs)t hrough the proportional addition of different components.T he completes ynthesis routes can be divided into at least two independent parts, indicatinge fficient synthesis procedures. Furthermore, SCs with ap rocessed amphiphilic nature or responsive properties can self-assemble into different morphologies, such as micelles and vesicles,s ot hat they can be applied in the drug-delivery field.…”

“…Currently, noncovalent interactions, such as host–guest interactions, hydrogen‐bonding interactions, and metal–ligand coordination, have been utilized to construct various supramolecular complexes (SCs) through the proportional addition of different components. The complete synthesis routes can be divided into at least two independent parts, indicating efficient synthesis procedures.…”