Core–Shell Structured Magnetic γ-Fe 2 O 3 @PANI Nanocomposites for Enhanced As(V) Adsorption

Xiao

et al. 2021

Chemistry A European J

Self Cite

It is highly desirable to design advanced heteroatomic doped porous carbon for wide application. Herein, Ndoped porous carbon (NPC) was developed via the fabrication of high nitrogen cross-linked triazine polymers followed by pyrolysis and activation with controllable porous structure. The as-synthesized NPC at the pyrolysis temperature of 700°C possessed rich nitrogen content (up to 11.51 %) and high specific surface area (1353 m 2 g À 1 ), which led to a high CO 2 adsorption capability at 5.67 mmol g À 1 at 298.15 K and 5 bar pressure and excellent stability. When the activation temperature was at 600°C, such NPC exhibited a superior electrochemical performance as anode for supercapacitors with a specific capacitance of 158.8 and 113 F g À 1 in 6 M KOH at a current density of 1 and 10 A g À 1 , respectively. Notably, it delivered an excellent stability with capacity retention of 97.4 % at 20 A g À 1 after 6000 cycles.

Section: Resultsmentioning

confidence: 99%

N‐Doped Porous Carbon Derived from Solvent‐Free Synthesis of Cross‐Linked Triazine Polymers for Simultaneously Achieving CO₂ Capture and Supercapacitors

Xiao

et al. 2021

Chemistry A European J

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“…Figure 3 c,f and Figure S4i–l compare the N 1s core-level XPS spectra of all samples. Two peaks with binding energy of 398.4 and 400.3 eV are ascribed to the pyridine-N and pyrrolic-N, respectively [ 32 ]. Notably, more pyrrolic-N is observed in the M/P-0.1-600-2, which more favors the CO 2 capture [ 33 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

MWCNT Decorated Rich N-Doped Porous Carbon with Tunable Porosity for CO2 Capture

et al. 2021

Self Cite

Designing of porous carbon system for CO2 uptake has attracted a plenty of interest due to the ever-increasing concerns about climate change and global warming. Herein, a novel N rich porous carbon is prepared by in-situ chemical oxidation polyaniline (PANI) on a surface of multi-walled carbon nanotubes (MWCNTs), and then activated with KOH. The porosity of such carbon materials can be tuned by rational introduction of MWCNTs, adjusting the amount of KOH, and controlling the pyrolysis temperature. The obtained M/P-0.1-600-2 adsorbent possesses a high surface area of 1017 m2 g−1 and a high N content of 3.11 at%. Such M/P-0.1-600-2 adsorbent delivers an enhanced CO2 capture capability of 2.63 mmol g−1 at 298.15 K and five bars, which is 14 times higher than that of pristine MWCNTs (0.18 mmol g−1). In addition, such M/P-0.1-600-2 adsorbent performs with a good stability, with almost no decay in a successive five adsorption-desorption cycles.

“…The satellite peak (718.7 eV) is consistent with the characteristic of γ‐Fe 2 O 3. [ 56 ] In contrast to that of Fe 2 O 3 @C, the Fe 2p XPS spectra of FeS x ‐Fe 2 O 3 @CN and Fe 2 O 3 @CN catalysts display a new peak at 710.2 eV corresponding to Fe coordinated N to form Fe‐N x configuration, [ 57,58 ] which helps immobilize the metallic Fe atoms on their original position and prevent their agglomeration and mobility. Among three catalysts, the developed FeS x ‐Fe 2 O 3 @CN catalyst has the highest contents of Fe 2+ and Fe‐N x species, suggesting that pyrolysis of sulfurized N,Fe‐containing MOFs could generate more active Fe 2+ species and enhance the dispersity of Fe species.…”

Section: Resultsmentioning

confidence: 99%

“…The satellite peak (718.7 eV) is consistent with the characteristic of γ-Fe 2 O 3. [56] In contrast to that of Fe [57,58] which helps immobilize the metallic Fe atoms on their original position and prevent their agglomeration and mobility. Generally, the degree of sulfidation plays a crucial impact on the preparation of the sulfurized catalysts.…”

Section: Catalytic Performance and Characterizations Of As-synthesized Catalystsmentioning

confidence: 99%

Highly efficient N‐doped carbon supported FeS_x‐Fe₂O₃ catalyst for hydrogenation of nitroarenes via pyrolysis of sulfurized N,Fe‐containing MOFs

She

et al. 2021

Applied Organom Chemis

Integrating MOFs as precursor, especially for employing N-containing organic linkers, with sulfides is an effective method to prepare the highly efficient N-doped carbon supported metal-based catalysts for hydrogenation of nitroarenes. In this work, a N,Fe-containing metal organic frameworks (MOFs; termed as MIL88-HMTA) with spindle-like structure was prepared via self-assembly method, in which hexamethylenetetramine (HMTA) linker was introduced as N source. Subsequently, N-doped carbon supported FeS x -Fe 2 O 3 catalyst (named FeS x -Fe 2 O 3 @CN) was fabricated upon the pyrolysis of sulfurized MIL88-HMTA. Catalytic experiments reveal that the FeS x -Fe 2 O 3 @CN delivered excellent performance for hydrogenation of nitroarenes in comparison with those of catalyst without sulfidation process (Fe 2 O 3 @CN) and conventional MIL88 derived catalyst (Fe 2 O 3 @C). The XRD, TEM, SEM/EDX, Raman, UV, and XPS analyses have revealed that the developed FeS x -Fe 2 O 3 @CN catalyst exhibited outstanding catalytic efficiency was ascribed to synergistic effect between FeS x and Fe 2 O 3 species, abundant structural defects, more Fe-N x species, and strengthened decomposition ability of hydrazine hydrate (N 2 H 4 ÁH 2 O). Furthermore, the effect of sulfidation ratio (the mass ratio between thioacetamide and MIL88-HMTA) towards preparation of the developed FeS x -Fe 2 O 3 @CN on the catalytic activity of hydrogenation reaction was also systematically performed. Notably, the optimized catalyst (denoted as FeS x -Fe 2 O 3 @CN-8) exhibited unexpected performance and recyclability for hydrogenation of nitroarenes under mild condition. The pyrolysis of sulfurized N-containing MOFs may present a facile approach for fabricating MOFsderived N-doped carbon supported catalysts, which provides a potential application in heterogeneous catalytic reactions.