BULLETIN OF THE KOREAN CHEMICAL SOCIETY
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2020
·Vol. 41
·期 3
·261-265
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IF 0.611
Yue-Xin Liu,Shi-Man Du,Jie Cao,Wen-sheng Huang,Xiao-Ru Zhang,Bao-Ping Qi,Sheng-Hui Zhang
N-doped porous biochar (NPB) with large conjugated systems could not only be used as enrichment carriers but also be in favor of electron transport in the electrochemical detection. The NPB-modified electrode was fabricated for the simultaneous detection of catechol (CA) and hydroquinone (HQ) to enhance the signal-to-noise ratio and further improve the sensitivity. A detection limit as low as 37 and 47 nM was achieved for CA and HQ, respectively. The proposed strategy with the merits of high sensitivity, selectivity, and reproducibility exhibited a great potential for the detection.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Jianan Yu,Zhiliang Zhu,Hua Zhang,Xiaolin Shen,Yanling Qiu,Daqiang Yin,Shaobin Wang
Metal-free carbocatalysts are raising increased interest in advanced oxidation processes (AOPs) for green degradation of aqueous organic pollutants. In the present study, a series of N-doped hydrochars (NHCs) was prepared from pinewood biomass and used in carbocatalysis toward catalytic peroxymonosulfate (PMS) activation to degrade refractory endocrine disrupting compounds. Nitrogen-doping was found to regulate the concentrations and types of persistent free radicals (PFRs) on hydrochar, promoting the electron transfer and oxidative degradation of the contaminants. Mechanistic studies revealed that graphitic N not only shows a strong electron transfer to facilitate PMS activation in a nonradical pathway, but also induces the formation of oxygen-centered PFRs from the structure defects for a radical oxidation pathway. More importantly, the PMS/NHC system demonstrates efficient degradation and satisfactory stability for real water treatment. This study has gained in-depth understanding on the roles of N-dopants in radical and nonradical pathways of biomass-based carbocatalysis, and will provide a promising and environmental-friendly route for efficient degradation of refractory endocrine disrupting compounds for green remediation.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Li Lv,Pengfei Cheng,Yinglin Wang,Luping Xu,Bao Zhang,Chao Lv,Jian Ma,Yue Zhang
In this paper, the preparation process and gas sensing performance of Sb-doped three-dimensional spinel ferrite (3D ZnFe 2 O 4 ) with well-assembled macroporous spherical structure have been investigated. Sb-doped 3D ZnFe 2 O 4 macroporous spheres (MPs) were prepared through a one-step ultrasonic spray pyrolysis (USP) method by sacrificing self-assembly sulfonated polystyrene spheres (S-PSs). The interconnected macropores (an average pore size about 200 nm) can be observed in the as-prepared materials by SEM and TEM characterization, which provided the dual functions of accelerating the diffusion of gas molecules and providing more reactive sites. The XPS analysis showed that the element Sb existed as Sb 5+ in doped samples. Compared with the pure 3D ZnFe 2 O 4 MPs (response = 18), 0.5 % Sb-doped sample presented the response of 35.5–100 ppm n-butanol at 250 °C, and also revealed excellent selectivity and long-term stability to n-butanol. The greatly enhanced sensing performance of Sb-doped simples can be attributed to the construction of 3D spheres with interconnected macroporous structures and the modification of Sb doping. The formation of p-n junctions at interface through Sb doping also improved the sensing performance for n-butanol. In addition, the relative sensing mechanism of Sb-doped 3D ZnFe 2 O 4 MPs for n-butanol sensing has been discussed in detail.
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MICROCHEMICAL JOURNAL
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2020
·
IF 3.594
Xuejian Xing,Li Huang,Shaojing Zhao,Jiafu Xiao,Minhuan Lan
S,N-doped carbon dots (S,N-CDs) were facilely prepared via a hydrothermal method by using thiourea and citric acid (CA) as precursors. The as-prepared S,N-CDs exhibited high stability in aqueous solution and were applied for fluorometric detection of tetracyclines (TCs). The approach was developed on the basic of the fluorescence of S,N-CDs at 440 nm, which was selectively quenched by TCs through the inner filter effect (IFE) mechanism. Moreover, the fluorescence of TCs with maximum at 600 nm could be used as the internal standard signal, resulting in a fluorometric spectral response. The limit of detection (LOD) was 0.25, 0.39 and 0.26 μM for tetracycline (TC), doxycycline (DC) and oxytetracycline (OTC), respectively. Furthermore, S,N-CDs were successfully utilized for the detection of residual TCs in fish and pork samples with acceptable recovery and good RSD.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2020
·
IF 4.551
Baoxun Zhao,Changsheng Song,Fei Wang,Wenwen Zi,Hongbin Du
Carbon materials are attracting increasing attention because they are widely applied in batteries, supercapacitors , catalysis and other fields. In this work, we report a simple one-pot method to produce nitrogen-doped carbon materials (NCMs) by reacting N-bromosuccinimide with calcium carbide . The obtained carbon structures are partially graphitic, with significant amount of nitrogen doped into the carbon network. The texture properties of NCMs vary with the preparative temperature. The NCM prepared at 700 °C possessed dual micropores (7 Å and 12 Å) and mesopores with the largest specific surface area of 1436 m 2 g −1 . It exhibited good charge storing performance when used in a capacitor, with a high specific capacitance of 214.8 F g −1 at the current density of 0.2 A g −1 . The capacitance remains 96% after 5000 cycles. This work provides a simple way to synthesize N-containing carbon materials with excellent charge storage properties, which may be used to synthesize other tailored carbon materials with various properties.
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ACS Applied Nano Materials
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2020
·
IF 0
Hao Zhang,Xiaojing Song,Chen Zhao,Dianwen Hu,Wenxiang Zhang,Mingjun Jia
Designing highly efficient heterogeneous catalysts for the Friedel–Crafts acylation (FCA) reaction is a very significant subject for the development of green chemical industry. Herein, a series of nanosized iron carbide-encapsulated N-doped porous carbons (FexC/NC-n) have been prepared through high-temperature pyrolysis of the Fe-Zn bimetallic organic framework for the catalytic application in FCA of aromatic compounds with acyl chlorides. A variety of characterization results demonstrated that the nanosized iron carbides (FexC), which are wrapped inside of the graphitic carbon shell, are the main active sites for the FCA reaction. Changing the ratios of Fe/Zn can considerably influence the particle size of FexC and the thickness of the graphitic carbon shell. The composition-optimized catalyst, named as FexC/NC-0.05, exhibited the highest activity and excellent recyclability for the reaction. The relatively thin graphitic carbon shell allows rapid penetration of reagents and, meanwhile, can also provide effective protection for the active FexC particles against leaching by space confinement and electronic effects, thus resulting in the formation of highly active and stable FexC/NC-n catalysts for the FCA reaction.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Chuan Long,Chuanrui Lu,Yunxi Li,Zhihua Wang,Hong Zhu
Graphene oxide (GO) is a potential material in the electrode and membrane of polymer electrolyte membrane fuel cells due to its unique structure and various oxygen-containing functional groups. A class of three-layered GO/poly (phenylene oxide) for AEMs was prepared in this work. GO was functionalized with highly stable 6-azonia-spiro [5.5]undecane groups and used as a fast hydroxide conductor, named ASU-GO. Functionalized by N-spirocyclic cations, poly (phenylene oxide) (PIPPO) was then combined with ASU-GO and GO to fabricate the ASU-GO/PIPPO and GO/PIPPO. Notably, the maximum hydroxide conductivity of the ASU-GO/PIPPO was 73.7 mS cm −1 at 80 °C, which was 3 times higher than that of the GO/PIPPO. The enhancement in hydroxide conductivity was due to the changes in the hydroxide transport mechanism and the poor stacked structure of the ASU-GO layer. Only 10.8% drops in hydroxide conductivity of ASU-GP/PIPPO after the alkaline test (1 M KOH at 80 °C for 700 h). Furthermore, the ASU-GO/PIPPO-50 membrane showed a maximum peak power density of 102 mW cm −2 , demonstrating the prepared membrane was promising in the AEM applications.
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JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 26
·11970-11983
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IF 3.553
Niu Yingchun,Li Xueai,Dong Wenqi,Zhang Can,Zhao Kuihu,Wang Fengyan,Wang Haiyan
Carbon and iron composites have drawn much attention for their unique electromagnetic properties. In addition, nitrogen doping of carbon can effectively modulate the dielectric properties of carbon. Therefore, synthesis of N-doped carbon and iron composites is an alternative method for obtaining high-efficiency microwave absorption materials. In previous studies, the synthesis process was very complicated including multistep routes. In this work, N-doped carbon with embedded Fe/Fe 3 C was synthesized in-situ via pyrolysis of amino phenol formaldehyde resin (APF) scattered with Fe 2 O 3 nanoparticles (APF/Fe 2 O 3 ), which was obtained through a simple hydrothermal process. During the heat-treatment process, the APF resin was converted into N-doped carbon, and simultaneously, the Fe 2 O 3 was reduced to iron nanoparticles. Then, inevitably, the iron nanoparticles reacted with carbon to form Fe 3 C at the interface between the iron particles and carbon. Taking advantage of multiple heterogenous interface, the interfacial polarization relaxation could be enhanced. Therefore, the N-doped carbon with embedded Fe/Fe 3 C particles displays microwave absorption with a maximum reflection loss of − 70 dB. Moreover, the effective absorption bandwidth (reflection loss of less than − 10 dB) reaches 6.02 GHz at a thickness of 2.13 mm. This study not only provides composites of N-doped carbon with embedded Fe/Fe 3 C particles with excellent stable microwave absorption but also offers a simple method for synthesizing N-doped carbon with embedded Fe/Fe 3 C particles.
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Journal of Energy Chemistry
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2020
·
IF 7.216
Hui Ning,Dianliang Guo,Xiaoshan Wang,Zhonghao Tan,Wenhang Wang,Zhongxue Yang,Linqing Li,Qingshan Zhao,Jian Hao,Mingbo Wu
Developing of economic and efficient catalysts is critical for the application of electroreduction of carbon dioxide to highly valuable chemicals. Herein, we present a facile method to synthesize N-doped hieratically porous carbon through pyrolysis of petroleum pitch followed by ammonia etching. We found mesopores are favored formation by removing of asphaltene from petroleum pitch during the carbonation process. Simultaneously, ammonia etching can not only increase the pyridinic-N content, but also upgrade the ratio of meso- to micro- pores of carbon materials. Using the N-doped hieratically porous carbon as catalyst for carbon dioxide electroreduction, the Faradaic efficiency of carbon monoxide reaches 83% at −0.9 V vs. the reversible hydrogen electrode (RHE) in 0.1 M KHCO 3 . This superior performance is attributed to the synergistic effects of highly pyridinic-N content in conjunction with the hieratically porous architecture, rendering abundant exposed and accessible active sites for electroreduction of CO 2 . Our work provides a new strategy for the large-scale preparation of high-performance, low-cost catalysts for CO 2 electroreduction.
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CHEMICAL PAPERS
·
2020
·Vol. 75
·期 1
·115-122
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IF 1.68
Gao Jie,Zhang Lingfan,Qian Junchao,Chen Feng,Zhang Wenqing
N-doped TiO 2 fiber membranes were prepared by electrospinning method and adsorptive chitosan was added as a nitrogen source. The obtained TiO 2 fiber membranes were analyzed by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The results show that the film has adsorption properties; furthermore, the morphology of the TiO 2 fiber with a chitosan content of 0.5 g after calcination provides the best catalytic performance; An anatase–rutile titania was found in the oxidized fiber film found in the Raman spectrum TiO 2 ; XPS demonstrated that the introduction of chitosan could replace N atom with partial lattice oxygen in TiO 2 . Moreover, the degradation rate of methylene blue of the material was about 60–80% after 4-h reaction, and the maximum degradation rate was achieved by nanofiber film with chitosan concentration of 0.5 g.
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GREEN CHEMISTRY
·
2019
·Vol. 22
·期 3
·742-752
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IF 9.405
Xiwei Hu,Xun Sun,Qiang Song,Yangyang Zhu,Yu Long,Zhengping Dong
Metal-free carbon catalysts with excellent catalytic performance have drawn much research attention recently. Herein, polymer-derived N,S co-doped carbon catalysts (PDNSC-X) with a hierarchically porous structure were facilely prepared by a cost-effective and convenient strategy via carbonization of a N- and S atom-containing polymer precursor and were subsequently used as efficient metal-free catalysts. The catalytic activity of the as-fabricated PDNSC-800 was greater than those of other reported heteroatom-doped carbon catalysts in catalytic reduction of various nitroarenes. The high catalytic activity of PDNSC-800 was related to the synergistic effects of a high surface area, a hierarchically porous structure, abundant N- and S-containing active sites, and defect formation. In addition, the close relationship between the N species (especially pyrrolic N) and high selectivity in metal-free catalytic synthesis was investigated in the reduction of nitroarenes and selective oxidation of ethylbenzene. This study may provide a new strategy to fabricate specific heteroatom-doped metal-free carbon catalysts for environmentally friendly efficient organic transformation.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Zhaoyang Wang,Fangyu Xiong,Haizheng Tao,Yuanzheng Yue
To optimize the Na 0·74 CoO 2 -based cathode materials for sodium-ion batteries, we fabricated a series of Na 0·74 CoO 2 /C/N-based composites by sintering the mixtures of ZIF-4(Co) (Co [H 2 C 3 N 2 ] 2 ) and Na 2 CO 3 , which possess various molar Na/Co ratios (X = 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2 and 2.0), at 800 °C for 6 h. By performing the electrochemical characterizations, we found that the composite with X = 0.7 (NC-0.7) exhibits the optimum sodium storage performance, i.e., excellent Na + storage capacity (107.9 mA h g −1 at 0.1 C), and high cycling stability (74% of the discharge capacity retention after 500 cycles at 10 C). In addition, for this NC-0.7 composite, we discovered a large difference (48.1 mA h g −1 ) between the charging (59.8 mA h g −1 ) and discharging (107.9 mA h g −1 ) capacities for the first cycle. Using the X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and scanning transmission electron microscope, we clarified the atomic-scale origin of the large capacity difference, and revealed the role of the amorphous phase in the as-prepared Na 0·74 CoO 2 /C/N composite cathode.
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