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 

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 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.

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.

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 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) 

Metal-free nitrogen -doped carbon nanosheets: a catalyst for the direct synthesis of imines under mild conditions

2019 ◽  
Vol 21 (9) ◽  
pp. 2448-2461 ◽  
Author(s):  
Kaizhi Wang ◽  
Pengbo Jiang ◽  
Ming Yang ◽  
Ping Ma ◽  
Jiaheng Qin ◽  
...  
Keyword(s):  
Direct Synthesis ◽  
Catalytic Performance ◽  
Transfer Hydrogenation ◽  
Carbon Nanosheets ◽  
Nitrogen Doped ◽  
Metal Free ◽  
Mild Conditions ◽  
Nitrogen Doped Carbon ◽  
Hydrogenation Of Nitriles

Herein, a highly stable, porous, multifunctional and metal-free catalyst was developed, which exhibited significant catalytic performance in the oxidation of amines and the transfer hydrogenation of nitriles under mild conditions.

Graphitic carbon nitride (g-C3N4) as an efficient metal-free Fenton-like catalyst for degrading organic pollutants: the overlooked non-photocatalytic activity

2020 ◽  
Vol 81 (3) ◽  
pp. 518-528 ◽  
Author(s):  
G. X. Zhu ◽  
T. L. Lu ◽  
L. Han ◽  
Y. Z. Zhan
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Nitride ◽  
Catalytic Mechanism ◽  
Catalytic Performance ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Alkaline Condition ◽  
Weakly Alkaline ◽  
X Ray ◽  
Metal Free

Abstract Graphitic carbon nitride (g-C3N4) has attracted a large amount of research, mainly being used as a photocatalyst, but its Fenton-like catalytic performance has been overlooked. In this paper, the dark Fenton-like catalytic performance of g-C3N4 was evaluated by degrading rhodamine B over a wide pH range. The results showed that the g-C3N4, which was synthesized by conventional urea pyrolysis without any modification, was an efficient metal-free heterogeneous Fenton-like catalyst. The highest activity occurred under a weakly alkaline condition of about pH 10. The experiment of catalyst recycling indicated that g-C3N4 had long-term stability. The reactive oxidizing species of HO·, generated by the g-C3N4 activating H2O2, was identified by EPR and further supported by a scavenging experiment of HO· using isopropanol as the scavenger. The HNO3 oxidation of g-C3N4 resulted in catalytic deactivation, implying the catalytic activity originated from the surface reduced groups of g-C3N4. The structure of synthesized g-C3N4 before and after the HNO3 oxidation was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy, and a possible catalytic mechanism was proposed.

The Detection of Osthole and Application of Cell Imaging Based on Nitrogen-Doped Carbon Dots

NANO ◽  
2020 ◽  
Vol 15 (02) ◽  
pp. 2050025
Author(s):  
Ning Wang ◽  
Xuefang Yang ◽  
Haojiang Wang ◽  
Liping Xie ◽  
Weihua Jia ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Dots ◽  
Cell Imaging ◽  
Fluorescence Probe ◽  
Experimental Conditions ◽  
X Ray ◽  
Nitrogen Doped ◽  
High Fluorescence ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

A fluorescence probe has been synthesized for the detection of osthole using the nitrogen-doped carbon dots (NCDs) as shown in Fig. 1. The NCDs were fully characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR). Under the optimal experimental conditions, the NCDs fluorescence probe was highly selective and sensitive to osthole. The linear response range for osthole was 5.0–75[Formula: see text][Formula: see text]M with a detection limit of 38[Formula: see text]nM. The mechanism of the interaction of osthole and NCDs was discussed. The fluorescence probe has been applied to the analysis of biological samples. The as-synthesized NCDs with high fluorescence intensity, low toxicity and good biocompatibility were applied to cell imaging.

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