Journal of Materials Chemistry B
·
2020
·Vol. 9
·期 1
·125-130
·
IF 5.344
Huibo Wang,Fang Lu,Chongqing Ma,Yurong Ma,Mengling Zhang,Bo Wang,Yue Zhang,Yang Liu,Hui Huang,Zhenhui Kang
Gram-positive bacteria are one of the most common pathogens causing severe and acute infection, and hospital infection caused by Gram-positive bacteria have increased significantly. Also, as antibiotics have been widely used, abusing of antibiotics is becoming an increasingly serious problem which is followed by dangerous drug resistance. Here, we developed a series of cationic carbon dots (CDs) with high-performance as antibacterial agents by using tartaric acid and m-aminophenol as precursors. The surface charge of these CDs can be regulated from +4.5 ± 0.42 mV to +33.2 ± 0.99 mV by increasing the contents of pyridine N and pyrrolic N in CDs. Further antibacterial experiments show that 250 μg mL−1 of CDs with +33.2 ± 0.99 mV can selectively kill Gram-positive bacteria and the antibacterial efficiency can reach approximately >99%. These CDs with positive surface charge can be selectively absorbed on the cell walls of Staphylococcus aureus (S. aureus) via electrostatic interaction and then disturb their physiological metabolism, eventually leading to bacterial death. The present work provides a novel method to adjust the surface charge of CDs and apply these CDs as alternative antibacterial agents.
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Nature Catalysis
·
2021
·Vol. 4
·期 2
·134-143
·
IF 41.813
Zhao Yafei,Zhou Huang,Zhu Xiaorong,Qu Yunteng,Xiong Can,Xue Zhenggang,Zhang Qingwei,Liu Xiaokang,Zhou Fangyao,Mou Xiaoming,Wang Wenyu,Chen Min,Xiong Ya,Lin Xingen,Lin Yue,Chen Wenxing,Wang Hui-Juan,Jiang Zheng,Zheng Lirong,Yao Tao,Dong Juncai,Wei Shiqiang,Huang Weixin,Gu Lin,Luo Jun,Li Yafei,Wu Yuen
Single-atom catalysts often exhibit unexpected catalytic activity for many important chemical and biological reactions with respect to their bulk counterparts, and have been recognized as potential substitutes for natural enzymes. Here we report a biomimetic composite, yolk–shell Pd 1 @Fe 1 , that features two compatible single-atom systems with atomically dispersed Fe 1 sites in a N-doped carbon shell and Pd 1 sites in a yolk derived from a metal–organic framework. Directly utilizing the O 2 and H 2 sources generated on-site from the electrocatalytic overall water splitting, the as-synthesized yolk–shell Pd 1 @Fe 1 could simultaneously catalyse nitroaromatic hydrogenation and alkene epoxidation reactions and lead to a cascade synthesis of amino alcohols. Our findings provide a versatile strategy to integrate different single metal sites within one system to allow the continuous and easy synthesis of complex compounds for various challenging reactions.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Li Hou,Yuemei Qin,Tianran Lin,Ying Sun,Fanggui Ye,Shulin Zhao
The synthesized Fe-MIL-88NH 2 was used as a nanozyme and fluorescence probe to successfully construct a selective fluorescent sensing platform for one step determination of catechol. Fe-MIL-88NH 2 exhibited excellent peroxidase mimic property as well as fluorescence property. With the addition of H 2 O 2 and catechol, Fe-MIL-88NH 2 would catalyze the H 2 O 2 to form hydroxyl radicals ( OH). Then, the oxidation of catechol would be triggered by the formed OH, which resulted in the generation of 1, 2-benzoquinone. Afterwards, Michael reaction between the oxidation products of catechol (1, 2-benzoquinone) and Fe-MIL-88NH 2 ligands was triggered and then quenched the fluorescence of Fe-MIL-88NH 2 . The principle of the selective determination of catechol was due to the assistant effect of Michael reaction. Based on the above sensing mechanism, a fluorescent sensing platform for the determination of catechol was established. The limit of detection was 0.0913 μmol L −1 (3S 0, n=8 /K) within a fast response of 10 min. This simple and selective strategy, based on the Michael reaction and the superiority of Fe-MIL-88NH 2 nanozyme, provided a concise sensing platform for catechol determination, which broadened the scope of application of nanozyme and showed a great potential application for on-site testing in food and biology analysis.
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DYES AND PIGMENTS
·
2020
·
IF 4.613
Xiuling Ji,Xiaotian Yuan,Hongjuan Nian,Pengfei Song,Yingying Xiang,Yunlin Wei,Suping Wang,Kunhao Qin,Qi Zhang,Yujiao Tu
Novel blue fluorescent carbon dots (CDs- CP ) deriving from yeast Cryptococcus podzolicus 5–2 were successfully prepared via a facile and green hydrothermal synthesis method. It exhibited uniform particle size and possessed good excitation-dependent characteristic. The dead bacterial cells were selectively labled by the CDs- CP , but the live ones not, indicating good potential for the live/dead bacterial differentiation. It was found that the prepared CDs- CP showed low biotoxicity and excellent biocompatibility with multicolour fluorescence emission properties, which provided a new insight on the bioimaging application. In addition, the prepared CDs- CP exhibits high selectivity and sensitivity in Ag(I), 2,4-dinitrophenol (2,4-DNP) and 4-nitrophenol (4-NP) detection with excellent linear ranges of 0–15 μM (R 2 = 0.9945), 0–30 μM (R 2 = 0.9959) and 0–37.5 μM (R 2 = 0.9982), respectively. The low detection limits of Ag(I), 2,4-DNP and 4-NP were 113.57 nM, 73.36 nM and 86.47 nM, respectively. It revealed that static quenching mechanism dominated in Ag(I) quenching of the CDs- CP fluorescent, while those of 2,4-DNP and 4-NP were inner filter effect. The fluorescent CDs- CP was successfully applied to determine the Ag(I), 2,4-DNP and 4-NP in real water samples with satisfactory results. Therefore, it is a good candidate for bioimaging application and environmental pollutant detection.
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DYES AND PIGMENTS
·
2020
·
IF 4.613
Yujiao Tu,Suping Wang,Xiaotian Yuan,Yunlin Wei,Kunhao Qin,Qi Zhang,Xuemei Chen,Xiuling Ji
The highly fluorescent nitrogen, phosphorus carbon dots ( Gl N,P-CDs) and G l CDs deriving from Ganoderma Lucidum were successfully prepared by a simple hydrothermal method . The Gl N,P-CDs exhibited low biotoxicity and good biocompatibility by cell imaging , onion skin staining and in vivo bioimaging . In addition, Gl N,P-CDs and G l CDs showed high selectivity and sensitivity in detecting 2,4-dinitrophenol (2,4-DNP) and 4-nitrophenol (4-NP). Good linear range 0–37.5 μM (R 2 = 0.9923) and 0–50 μM (R 2 = 0.9944) for Gl CDs, and 0–30 μM (R 2 = 0.9914) and 0–30 μM (R 2 = 0.9976) for Gl N,P-CDs were obtained, and the low detection limits were 89.77 nM, 100.27 nM ( Gl CDs) and 73.03 nM, 68.09 nM ( Gl N,P-CDs) for 2,4-DNP and 4-NP, respectively. It revealed that the inner filter effect dominated in quenching of the Gl CDs and Gl N,P-CDs fluorescent by 2,4-DNP and 4-NP. The Gl N,P-CDs was successfully used to detect 2,4-DNP and 4-NP in real water and soil samples. It provided a new insight on the bioimaging application and environmental pollutants detection.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 26
·11970-11983
·
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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NANO
·
2020
·
IF 1.566
Suping Wang,Yujiao Tu,Kunhao Qin,Xiaotian Yuan,Wei Chen,Yunlin Wei,Zhiwei Xu,Qi Zhang,Xiuling Ji
Phenolic compounds, especially 4-nitrophenol (4-NP), and chromium (VI) are highly toxic environmental pollutants. Thus, it is significantly important to establish a rapid and sensitive sensor for 4-NP and Cr(VI) monitoring in environment. In this paper, a novel approach has been adopted where E. coli -derived CDs (CDs- WT ) prepared by one step hydrothermal method previously and sensitized by ampicillin (turn-on) were used as fluorescence nanoprobe (CDs- WT -Amp) for 4-NP and Cr(VI) determination based on the inner filter effect quenching mechanism (turn-off). Then, the quenching fluorescence was reversed by addition of ampicillin (turn-on). The linear ranges of 4-NP and Cr(VI) detection were 0–50 μ M and 0–25 μ M, with the limits of detection 88.89 nM and 64.75 nM, respectively. The “turn-on-on-off-on” fluorescent nanosensor system was successfully used to determine Cr(VI) and 4-NP in water with satisfactory results. It shows that the “turn-on-off-on” nanoprobe has great promising potential for application to environmental pollutant detection.
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CARBON
·
2020
·
IF 8.821
Xiuhong Zhang,Weilin Shen,Zheng Li,Dong Wang,Ji Qi,Changhai Liang
Since the support of conventional electrocatalysts is mostly inert, certain parts of these supported electrocatalysts that have direct contact with the reactants do not have electrocatalytic function. Therefore, the surface area of these electrocatalysts is larger than their electrochemically active surface area. So as to make full use of the available surface area and release the activity potential of the electrocatalysts, this work synthesized a carbon-based active support with certain electrocatalytic activity for water oxidation reaction, providing a general route to prepare electrocatalysts with electrochemically active surface area close to their surface area. In detail, a cubic core-shell support was synthesized via an aqueous phase synthesis method for oxygen evolution reaction (OER). The carbon-based active support with a larger specific surface area (306 m 2 g −1 ) is beneficial to the dispersion of the active sites. The support has appropriate OER catalytic activity which can synergistically catalyze OER together with NiFe (oxy)hydroxide on it during the reaction. Under the current density of 10 mA cm −2 , the overpotential is as low as 214 mV for OER, which is better than those of most non-precious metal catalysts , suggesting that carbon-based active support could effectively reduce energy consumption via promoting surface area utilization ratio.
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RSC Advances
·
2020
·Vol. 10
·期 5
·2932-2941
·
IF 3.119
Xia Wan,Yuchen Li,Huining Xiao,Yuanfeng Pan,Jie Liu
Nitrogen-doped ordered mesoporous carbons (NOMCs) were synthesized by single-step hydrothermal self-assembly using F127 as a soft template, hexamine as a formaldehyde source, L-lysine as a polymerization catalyst, and 3-aminophenol as both carbon and nitrogen sources. The microstructure of the NOMCs was characterized by XRD, N2 adsorption/desorption, TEM, FTIR, and XPS. The results indicated that the obtained NOMCs exhibited a large specific surface area, uniform pore size distribution and highly ordered 2-D hexagonal mesostructure (P6mm). Besides, the nitrogen was uniformly doped into the carbon framework in the form of various nitrogen species. The adsorption isotherms of CO2 and N2 were also determined and could be well fitted by a DSL model. The capture capacity of CO2 was affected by both the nitrogen content and mesostructure of the adsorbents. Overall, NOMC-L-0.5 displayed excellent CO2 capture capacity (0 °C, 3.32 mmol g−1; 25 °C, 2.50 mmol g−1), and still demonstrated great regenerability with only 2% loss after several CO2 adsorption/desorption cycles. Moreover, the CO2/N2 selectivity calculated by IAST was as high as 43.2 at 25 °C in a typical composition of flue gas (binary mixtures with 15% CO2). The superior adsorption performance enables NOMCs to be a promising CO2 adsorbent in practical applications.
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Materials Today Energy
·
2021
·
IF 7.311
Huiyu Gai,Song Xue,Xingkun Wang,Jian Zhou,Heqing Jiang,Minghua Huang
Fabricating highly efficient catalysts toward oxygen reduction reaction (ORR), especially carbon-based metal-free ones, plays a crucial role in large-scale applications of various renewable energy conversion devices. However, the poor electrocatalytic performance of these carbon catalysts severely hinders their application because most active sites are deeply buried inside the carbon framework and fail to be accessible for the reactants. In this work, we fabricate multimodally porous N-doped dual-carbon catalyst with a sandwich-like structure, that is, N-doped mesoporous carbon spheres loaded on reduced graphene oxide nanosheets (N-MCS@rGO). The obtained catalysts exhibit interconnected hierarchical microporous/mesoporous/macroporous structure and a high specific surface area, which can simultaneously maximize the efficient utilization of active sites and facilitate mass transport, resulting in superior alkaline ORR activities. The half-wave potential of the N-MCS@rGO was ~0.85 V vs. reversible hydrogen electrode (RHE) in 0.1 M KOH, preceding most of the non-noble metal catalysts and comparable with ~0.86 V vs. RHE of commercial 20 wt% Pt/C catalysts. The established Zn-air batteries using the N-MCS@rGO as the air cathode exhibit a high power density of 100 mW/cm 2 , outperforming the commercial Pt/C catalyst-based battery. This work supplies an interesting avenue in the rational construction of multidimensional hierarchically porous materials for advanced energy conversion technologies.
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Biomass Conversion and Biorefinery
·
2021
·Vol. 13
·期 8
·7175-7184
·
IF 4.987
Yang Chunyan,Zhang Liu,Zhu Yingming,Liu Yingying,Liu Changjun,Wu Kejing,Lu Houfang,Liang Bin
In this study, ordered mesoporous carbon materials are prepared to support β-Mo 2 C catalysts for conversion of Kraft lignin into aromatic monomers. Carbon supports with different porous structures are compared to discuss the critical role of ordered mesopores. The results show a volcano evolution of aromatic monomer yields with the increase in Mo contents over β-Mo 2 C supported on ordered mesoporous carbon, and a high aromatic yield of 0.576 g/g Kraft lignin is achieved at 280 °C for 3 h for only 10% Mo mass content. Dispersion of β-Mo 2 C and confinement of ordered mesopores contribute to the highest aromatic yield per unit Mo. The highly dispersed β-Mo 2 C on the surface of ordered mesoporous carbon exhibits the advances of confined environment and accessibility of lignin fragments to active β-Mo 2 C, resulting high activity of β-Mo 2 C for Kraft lignin decomposition.
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Micromachines
·
2021
·Vol. 12
·期 9
·1116
·
IF 2.891
Shuiqin Chai,Lijia Zhou,Shuchen Pei,Zhiyuan Zhu,Bin Chen
It is a major challenge to effectively inhibit microbial pathogens in the treatment of infectious diseases. Research on the application of nanomaterials as antibacterial agents has evidenced their great potential for the remedy of infectious disease. Among these nanomaterials, carbon quantum dots (CQDs) have attracted much attention owing to their unique optical properties and high biosafety. In this work, P-doped CQDs were prepared by simple hydrothermal treatment of m-aminophenol and phosphoric acid with fluorescence emission at 501 nm when excited at 429 nm. The P-doped CQDs showed effective antibacterial activity againstEscherichia coli(E. coli) andStaphylococcus aureus(S. aureus). The minimal inhibitory concentrations (MICs) of P-doped CQD were 1.23 mg/mL forE. coliand 1.44 mg/mL forS. aureus. Furthermore, the morphologies ofE. colicells were damaged andS. aureusbecame irregular when treated with the P-doped CQDs. The results of zeta potential analysis demonstrated that the P-doped CQDs inhibit antibacterial activity and destroy the structure of bacteria by electronic interaction. In combination, the results of this study indicate that the as-prepared P-doped CQDs can be a promising candidate for the treatment of bacterial infections.Keywords:carbon quantum dots;biocompatibility;antibacterial activity
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