scholarly journals Enhanced CO2 Adsorption on Nitrogen-Doped Carbon Materials by Salt and Base Co-Activation Method

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1207 ◽  
Author(s):  
Ruiping Wei ◽  
Xingchao Dai ◽  
Feng Shi
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Materials ◽  
Co2 Adsorption ◽  
Activation Method ◽  
Formaldehyde Resin ◽  
Co2 Absorption ◽  
X Ray ◽  
Nitrogen Doped ◽  
Co Activation ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon materials with enhanced CO2 adsorption were prepared by the salt and base co-activation method. First, resorcinol-formaldehyde resin was synthesized with a certain salt as an additive and used as a precursor. Next, the resulting precursor was mixed with KOH and subsequently carbonized under ammonia flow to finally obtain the nitrogen-doped carbon materials. A series of samples, with and without the addition of different salts, were prepared, characterized by XRD (X-ray powder diffraction), elemental analysis, BET (N2-adsorption-desorption analysis), XPS (X-ray photoelectron spectroscopy) and SEM (Scanning electron microscopy) and tested for CO2 adsorption. The results showed that the salt and base co-activation method has a remarkable enhancing effect on the CO2 capture capacity. The combination of KCl and KOH was proved to be the best combination, and 167.15 mg CO2 could be adsorbed with 1 g nitrogen-doped carbon at 30 °C under 1 atm pressure. The materials characterizations revealed that the introduction of the base and salt could greatly increase the content of doped nitrogen, the surface area and the amount of formed micropore, which led to enhanced CO2 absorption of the carbon materials.

scholarly journals Hydrothermal Activation of Porous Nitrogen-Doped Carbon Materials for Electrochemical Capacitors and Sodium-Ion Batteries

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2163 ◽  
Author(s):  
Yuliya V. Fedoseeva ◽  
Egor V. Lobiak ◽  
Elena V. Shlyakhova ◽  
Konstantin A. Kovalenko ◽  
Viktoriia R. Kuznetsova ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Nanomaterials ◽  
Carbon Materials ◽  
Sodium Ion ◽  
Carbon Surface ◽  
Energy Storage And Conversion ◽  
Sodium Ion Batteries ◽  
X Ray ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

Highly porous nitrogen-doped carbon nanomaterials have distinct advantages in energy storage and conversion technologies. In the present work, hydrothermal treatments in water or ammonia solution were used for modification of mesoporous nitrogen-doped graphitic carbon, synthesized by deposition of acetonitrile vapors on the pyrolysis products of calcium tartrate. Morphology, composition, and textural characteristics of the original and activated materials were studied by transmission electron microscopy, X-ray photoelectron spectroscopy, near-edge X-ray absorption fine structure spectroscopy, infrared spectroscopy, and nitrogen gas adsorption method. Both treatments resulted in a slight increase in specific surface area and volume of micropores and small mesopores due to the etching of carbon surface. Compared to the solely aqueous medium, activation with ammonia led to stronger destruction of the graphitic shells, the formation of larger micropores (1.4 nm vs. 0.6 nm), a higher concentration of carbonyl groups, and the addition of nitrogen-containing groups. The tests of nitrogen-doped carbon materials as electrodes in 1M H2SO4 electrolyte and sodium-ion batteries showed improvement of electrochemical performance after hydrothermal treatments especially when ammonia was used. The activation method developed in this work is hopeful to open up a new route of designing porous nitrogen-doped carbon materials for electrochemical applications.

scholarly journals Preparation of Nitrogen-Doped Carbon Materials from Monosodium Glutamate and Application in Reduction of p-Nitrophenol

2018 ◽  
Vol 13 (1) ◽  
pp. 89
Author(s):  
Ke-ying Cai ◽  
Ying Mei Zhou ◽  
Peng Wang ◽  
Huan Li ◽  
Yan Li ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Materials ◽  
Monosodium Glutamate ◽  
High Surface ◽  
High Surface Area ◽  
Heterogeneous Reactions ◽  
X Ray ◽  
Nitrogen Doped ◽  
Bismuth Nanoparticles ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbons (NCs) as supports for metal catalysts used in heterogeneous reactions are increasingly being investigated. In this work, NCs were prepared from monosodium glutamate (MSG) by direct carbonization, which were used as supporters to prepare Bi/NC catalysts. The Bi/NC catalysts were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), and nitrogen adsorption isotherm. The results indicate that nitrogen was doped in the formation of pyridinic N, pyrrolic N, and graphitic N. The NCs possess high surface area (~652 m2/g) and uniform mesopore size (~2.11 nm). Bismuth nanoparticles (NPs) dispersed uniformly in NC with diameter of 10-20 nm. The catalytic performances were investigated using the reduction of 4-nitrophenol (4-NP) with excess potassium borohydride as a model reaction, the results indicating that the Bi/NC catalysts have higher activity and better reusability than the Bi/AC catalyst. Under the following conditions: 100 mL of 4-NP (2 mM), 0.03 g of 3%Bi/NC, n(KBH4) : n(4-NP) = 40:1, and at room temperature, the rate constant k can reach 0.31 min-1. Copyright © 2018 BCREC Group. All rights reservedReceived: 28th July 2017; Revised: 1st September 2017; Accepted: 7th September 2017; Available online: 22nd January 2018; Published regularly: 2nd April 2018How to Cite: Cai, K.Y., Zhou, Y.M., Wang, P., Li, H., Li, Y., Tao, W. (2018). Preparation of Nitrogen-Doped Carbon Materials from Monosodium Glutamate and Application in Reduction of p-Nitrophenol. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (1): 89-96 (doi:10.9767/bcrec.13.1.1428.89-96) 

Synthesis and Properties of Nitrogen-Doped Mesoporous Carbon Materials Obtained by Templating of SBA-15 with Melamine-Formaldehyde Resin

2012 ◽  
Vol 554-556 ◽  
pp. 778-782 ◽  
Author(s):  
Chao Liu ◽  
Yong Qi Hu ◽  
Yi Feng Yu ◽  
Yue Zhang ◽  
Yan Yan Wang ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Mesoporous Carbon ◽  
Carbon Materials ◽  
Textural Properties ◽  
Formaldehyde Resin ◽  
Melamine Formaldehyde ◽  
X Ray ◽  
Nitrogen Doped ◽  
Surface Areas ◽  
Mesoporous Carbon Materials

Nitrogen-doped mesoporous carbon materials have been synthesized by using melamine-formaldehyde resin as carbon precursor and SBA-15 as a removable template. The structure of the materials was investigated by X-ray diffraction, BET specific surface area analysis, Fourier transform infrared spectroscopy, and thermogravimetric analysis. X-ray and BET studies confirmed that a pore nanostructure is inherited from the silica templates. Fourier transform infrared spectroscopy analysis showed N atoms are strongly bonded in the carbon structure in heterocycles or nitrile functions. These mesoporous nitrogen-doped carbon materials exhibits textural properties with BET surface areas ranging between 400 and 600 m2/g and uniform pore size(3.9 nm). The mechanism of carbonization process is studied by thermogravimetric analysis. The ratio of melamine/formaldehyde plays an important role during the carbonization process for the surface areas and textural properties, and element analysis reveals that the nitrogen content of the mesoporous carbon materials is as high as 10wt%.

scholarly journals Nitrogen-Doped Porous Carbon Materials Derived from Graphene Oxide/Melamine Resin Composites for CO2 Adsorption

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5293
Author(s):  
Like Ouyang ◽  
Jianfei Xiao ◽  
Housheng Jiang ◽  
Shaojun Yuan
Keyword(s):  
Graphene Oxide ◽  
Surface Area ◽  
Porous Carbon ◽  
Carbon Materials ◽  
Co2 Adsorption ◽  
Formaldehyde Resin ◽  
Batch Adsorption ◽  
Nitrogen Doped ◽  
Porous Carbon Materials ◽  
Adsorption Sites

CO2 adsorption in porous carbon materials has attracted great interests for alleviating emission of post-combustion CO2. In this work, a novel nitrogen-doped porous carbon material was fabricated by carbonizing the precursor of melamine-resorcinol-formaldehyde resin/graphene oxide (MR/GO) composites with KOH as the activation agent. Detailed characterization results revealed that the fabricated MR(0.25)/GO-500 porous carbon (0.25 represented the amount of GO added in wt.% and 500 denoted activation temperature in °C) had well-defined pore size distribution, high specific surface area (1264 m2·g−1) and high nitrogen content (6.92 wt.%), which was mainly composed of the pyridinic-N and pyrrolic-N species. Batch adsorption experiments demonstrated that the fabricated MR(0.25)/GO-500 porous carbon delivered excellent CO2 adsorption ability of 5.21 mmol·g−1 at 298.15 K and 500 kPa, and such porous carbon also exhibited fast adsorption kinetics, high selectivity of CO2/N2 and good recyclability. With the inherent microstructure features of high surface area and abundant N adsorption sites species, the MR/GO-derived porous carbon materials offer a potentially promising adsorbent for practical CO2 capture.

Nitrogen-doped carbon dots as a probe for the detection of Cu2+ and its cellular imaging

2019 ◽  
Vol 43 (11-12) ◽  
pp. 507-515 ◽  
Author(s):  
Ning Wang ◽  
Xuebing Li ◽  
Xuefang Yang ◽  
Zenglian Tian ◽  
Wei Bian ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Photoelectron Spectroscopy ◽  
Carbon Dots ◽  
Ph Value ◽  
Tap Water ◽  
Experimental Conditions ◽  
X Ray ◽  
Nitrogen Doped ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon dots were synthesized using citric acid monohydrate and glutathione as raw materials. The synthesized nitrogen-doped carbon dots were characterized by multiple analytical techniques, including transmission electron microscopy, Fourier transform infrared spectroscopy, ultraviolet–visible absorption spectroscopy, X-ray photoelectron spectroscopy, X-ray diffractometry, and fluorescence spectra. The fluorescence intensity of the nitrogen-doped carbon dots gradually quenched with different concentrations of Cu2+ ions. The effect of the pH value, the nitrogen-doped carbon dot concentration, and the reaction time on the fluorescence intensity of the N-CDs-Cu2+ system was investigated, and the experimental conditions were optimized. A rapid and sensitive method for the determination of Cu2+ ions was established that exhibited a good linearity in the concentration range 0.20–200.0 μM with a detection limit of 0.27 nM. Meanwhile, the fluorescence quenching mechanism of the interaction between nitrogen-doped carbon dots and Cu2+ was preliminarily discussed. The method was used to detect trace Cu2+ in tap water and lake water, with recoveries ranging from 98.1% to 102.0%. Furthermore, due to low cytotoxicity and good biocompatibility, nitrogen-doped carbon dots as a probe were also successfully used in bioimaging.

Nitrogen Doped and Functionalized Carbon Materials as Supports for Catalysts in Electro-Oxidation of Methanol

2014 ◽  
Vol 93 ◽  
pp. 41-49 ◽  
Author(s):  
M.J. Lázaro ◽  
C. Alegre ◽  
M.J. Nieto-Monge ◽  
D. Sebastián ◽  
M.E. Gálvez ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Materials ◽  
Synthesis Method ◽  
Electrochemical Analysis ◽  
Molar Ratio ◽  
Synthesis Process ◽  
X Ray ◽  
Nitrogen Doped ◽  
Oxidation Of Methanol ◽  
Electro Oxidation

The objective of this work is to study the behavior of Nitrogen-doped carbons as supports of catalysts for the electro-oxidation of methanol. Two carbon materials have been considered: a) carbon xerogels (CXG), highly mesoporous, whose porosity and pore size distribution are easily performed during the synthesis method; b) carbon nanofibers (CNF), which have a high electrical conductivity, good behavior in high temperature conditions and resistance to acid/basic media. Meanwhile, a commercial carbon black (Vulcan XC72R) which is commonly used in manufacturing of electrocatalysts fuel cells was used for comparison. Nitrogen was introduced into the CXG during the synthesis process, what is commonly referred as doping, by including melamine as a reactant. In contrast, N-groups were created over CNF by post-treatment with: ammonia (25%), urea (98%), melamine (99%) and ethylenediamine (99.5%), with a carbon: nitrogen molar ratio 1:0.6. N-containing carbon materials were characterized by elemental analysis, nitrogen adsorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), SEM-EDX and TEM to determinate the amount and forms of nitrogen introduced. Pt-catalysts were prepared by the microemulsion method. The influence of the nitrogen doping and functionalization on the catalytic behavior in the electrochemical oxidation of methanol was evaluated by different physicochemical and electrochemical analysis.

Supercapacitor from Nitrogen-Doped Carbon Nanotubes

2010 ◽  
Vol 160-162 ◽  
pp. 1791-1796 ◽  
Author(s):  
Li Xiang Li ◽  
Yong Chang Liu ◽  
Xin Gen ◽  
Bai Gang An
Keyword(s):  
Hydrazine Hydrate ◽  
Photoelectron Spectroscopy ◽  
Electron Spectroscopy ◽  
Atomic Ratio ◽  
Diameter Ratio ◽  
Cyclic Performance ◽  
X Ray ◽  
Nitrogen Doped ◽  
Pristine Cnts ◽  
Nitrogen Doped Carbon

CNTs were treated with hydrazine hydrate and diethylenetriamine, respectively. Scanning electron spectroscopy (SEM) observation showed that the doped CNTs kept the length/diameter ratio of pristine CNTs. X-ray photoelectron spectroscopy (XPS) characterized that nitrogen can be doped to CNTs. XPS analysis further indicated that C/N atomic ratio of CNTs treated by hydrazine hydrate is 95/2, four times of CNTs treated by diethylenetriamine, which is 96/0.5. The hydrophilicity for N-doped CNTs (N-CNTs) is much improved and enhanced by increasing N proportion. As electrode material of supercapacitor, nitrogen functional groups contribute pseudo-Faradic capacitance, but its cyclic performance still need to be improved. Thanks to the good hydrophilicity for N-CNTs that improves the wettability of CNTs for electrolyte; the specific capacitance of N-CNTs is still slightly higher than pristine CNTs after cycling.

scholarly journals Preparation of Metal-Free Nitrogen-Doped Carbon Material and Its Catalytic Performance

2019 ◽  
Vol 14 (1) ◽  
pp. 105
Author(s):  
Xuan Wang ◽  
Lei Yang ◽  
Ke-ying Cai ◽  
Ying Mei Zhou ◽  
Peng Wang ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Material ◽  
Catalytic Performance ◽  
Nitrogen Atmosphere ◽  
Laser Raman Spectroscopy ◽  
Nitrogen Species ◽  
X Ray ◽  
Nitrogen Doped ◽  
Metal Free ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon materials (NCMs) were prepared via hydrothermal treatment together with pyrolysis under nitrogen atmosphere by using melamine as nitrogen source and sucrose as carbon source. The NCMs were characterized by X-ray diffraction (XRD), laser Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The results showed that nitrogen species were successfully doped into NCMs in the formation of pyridinic N, pyrrolic N, graphitic N, and oxidized N. With the temperature of pyrolysis increasing, the total amount of nitrogen species decreased, while the proportion of graphitic N increased. The catalytic performance was investigated by the reduction of p-nitrophenol with excessive KBH4 at 30 ℃. The reaction rate constant can reach 1.06 min-1 for NCM-800. The NCM-800 has good stability, which can be used for 8 cycles without obvious deactivation. Copyright © 2018 BCREC Group. All rights reservedReceived: 1st May 2018; Revised: 30th September 2018; Accepted: 2nd Oktober 2018; Available online: 25th January 2019; Published regularly: April 2019How to Cite: Wang, X., Yang, L., Cai, K.Y., Zhou, Y.M., Wang, P., Song, M. (2019). Preparation of Metal-Free Nitrogen-Doped Carbon Material and Its Catalytic Performance. Bulletin of Chemical Reaction Engineering & Catalysis, 14 (1): 105-111 (doi:10.9767/bcrec.14.1.2593.105-111)Permalink/DOI: https://doi.org/10.9767/bcrec.14.1.2593.105-111 

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