JOURNAL OF MATERIALS RESEARCH
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2023
·Vol. 38
·期 11
·2863-2873
·
IF 2.7
Zhang XiaoNan,Yang Zhongxin,Xu Wenqin,Li Xing,Pan Guanghua,Chen Nan-Chun,Xie Qing-Lin,Wang Xiu Li
Potassium diformate (KDF) has broad prospects in replacing common antibiotics in animal feed; however, the utilization rate of KDF in the animal intestine is low. Therefore, it is necessary to construct a drug delivery system for its targeted release in the colon. When Zeolite P was used as a drug-binding effector, KDF was uniformly dispersed in the pectin matrix, and the pectin bacteriostatic microspheres loaded with KDF were prepared using the emulsion cross-linking method. The optimized pectin bacteriostatic microspheres were systematically characterized, we observed that the drug loading rate and stability of pectin bacteriostatic microspheres improved significantly after adding Zeolite P and the utilization rate of KDF in the simulated intestine was higher than that in the stomach. The pectin bacteriostatic microspheres exerted significant bacteriostatic effect on Escherichia coli and Staphylococcus aureus , indicating that they may be widely used in livestock feed as bacteriostatic agents. Graphical Abstract In order to improve the antibacterial effect of KDF in intestinal tract, W/O emulsion microcapsules were prepared by emulsification method. When Zeolite P was used as a drug-binding effector, KDF was uniformly dispersed in the pectin matrix, and the pectin bacteriostatic microspheres loaded with KDF were prepared using the emulsion cross-linking method. Moreover, the bacteriostatic microspheres possessed significant growth inhibitory effects on E. coli, S. aureus and Bacillus subtilis.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hongmei Zhang,Yuqing Gui,Yan Cao,Min Wang,Benzhi Liu
Molecularly imprinted electrochemical sensor for the detection of sulfamethoxazole was prepared by electropolymerization with sulfamethoxazole as template molecule and o-phenylenediamine as functional monomer. Electrochemical performance of molecularly imprinted sensor was studied by cyclic voltammetry in 0.1 mol/L KCl solution containing 5 μM K 3 Fe(CN) 6 . On the optimal experimental conditions, square wave voltammetry was used to detect sulfamethoxazole. The square wave voltammetric peak current difference of the sensor has a good linear relationship with the concentration of sulfamethoxazole in the range of 0.2to 1.4 μM, and the detection limit is 0.05 μM. The molecularly imprinted sensor has good selectivity, repeatability and stability.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shuai Guo,Le-wu Zhan,Bin-dong Li
Nitration reactions are extensively studied in organic synthesis despite their notorious dangers, high reaction rates, and heterogeneous reaction systems. To date, most industrial nitration reactions rely on conventional batch reactors characterized by low mass transfer rates and limited reaction conditions. In contrast, microreactors represent a valuable technology for intensifying such nitration reactions. In this work, we established a continuous flow system of o -xylene nitration and determined the kinetics and mass transfer. The effects of mixing performance, nitric acid concentration, molar ratio, reaction temperature, and residence time on the process safety were investigated separately. The experimental data is supported by dimensionless number calculations, providing a more comprehensive understanding of the nitration reaction's transport and reaction performance in a heart-shaped microreactor. Remarkably, the residence time of the heart-shaped microreactor was reduced by an order of magnitude, while the volumetric mass transfer coefficient was improved by several orders of magnitude compared to conventional stirred tank reactors. Moreover, the spent nitric acid could be efficiently recovered and reused after concentration, further enhancing the sustainability and cost-effectiveness of the process. Our findings demonstrate the significant potential of microreactors for intensifying nitration reactions and paving the way for the design and optimization of more efficient and safer synthetic processes.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 44
·2303986
·
IF 19
Xuefei Xu,Habib Ullah,Muhammad Humayun,Linfeng Li,Xia Zhang,Mohamed Bououdina,Damien P. Debecker,Kaifu Huo,Deli Wang,Chundong Wang
Constructing multiple heterogeneous structures allows for improving the electrocatalytic activity of NiO by incorporating multiple active sites. Unfortunately, the poor conductivity of NiO makes efficient charge transfer within the heterogeneous structures difficult, thereby inhibiting the improvement of its intrinsic activity. Herein, F-doped NiO/Ni@C heterogeneous catalyst (F-NiO/Ni@C) is fabricated via a new organic-inorganic hybrid approach, showing both advanced hydrogen evolution reaction (HER) and urea oxidation reaction (UOR) activity. The targeted F-doping increases electron delocalization, and facilitates electron transfer from Ni to NiO at the nano-interfaces. This interphase synergy provides ready-to-use F-NiO active sites, allowing F-NiO/Ni@C to achieve optimum H* adsorption Gibbs free energy for HER and a lower energy barrier for UOR. As a result, the as-configured F-NiO/Ni@C || F-NiO/Ni@C cell requires an ultra-low cell voltage of 1.37 V to achieve 10 mA cm −2 in alkaline media (with 0.3 M urea), outperforming the state-of-the-art benchmark Pt/C|| RuO 2 cell (1.45 V). This study reveals the positive impact of anion doping on interphase synergy and provides useful guidelines for designing monometallic catalysts for UOR as well as hydrogen generation.
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Journal of Energy Storage
·
2023
·
IF 9.4
Huizi Li,Tingyao Du,Qin Wang,Jianyu Guo,Siyong Zhang,Yan Lu
In this work, a novel carbonization method using H 2 SO 4 as dehydrating agent to prepare graphitized carbon material with O doping is firstly reported. Starch is used as the carbon source. After dehydration in H 2 SO 4 at 100 °C for 6 h, an O-enriched carbon material (OSC) is prepared. It exhibits a specific capacitance of 354 F g −1 at the current density of 1 A g −1 in 1 M H 2 SO 4 solution. After 20,000 cycles, the capacitance retention remains at 110.2 %. It is proved that appropriate amounts of doping O can provide a certain pseudocapacitance , and also improve the wettability of the material, which therefore improve the electrochemical performance of the carbon material. Further, a vapor deposition method using dicyandiamide is applied to grow N-doped carbon nanotubes on the smooth surface of the OSC, which form a three-dimensional conductive network structure on the surface and get a suitable porous structure with the specific surface area of 355 m 2 /g (NOSC). The specific capacitance of the NOSC is 759 F g −1 at the current density of 1 A g −1 in 1 M H 2 SO 4 solution. After 10,000 cycles, the capacitance retention still remains at 95.8 %. The assembled all-solid symmetric supercapacitor based on the NOSC can be operated in a 0–1.8 V voltage window. The energy density is 41.12 Wh kg −1 with a power density of 449.95 W kg −1 .
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Meilan Pan,Xue Zhang,Chenglei Pan,Jiong Wang,Bingjun Pan
Strategies for harmonizing the construction of an active site and the building of electron transport for a hybrid MoS2 catalyst are crucial for its application in electrochemical reactions. In this work, an accurate and facile hydrothermal strategy was proposed to fabricate the active center of Co–O–Mo on a supported MoS2 catalyst by forming a CoMoSO phase on the edge of MoS2, yielding (Co–O)x-MoSy (x = 0, 0.3, 0.6, 1, 1.5, or 2.1). The results show that the electrochemical performances (hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and electrochemical degradation) of the yielded MoS2-based catalysts were positively correlated with the Co–O bonds, verifying the significant role of Co–O–Mo as the active center. The fabricated (Co–O)-MoS0.9 presented an extremely low overpotential and Tafel slope in both HER and OER, and it also demonstrated excellent BPA removal in the electrochemical degradation reaction. As compared with the Co–Mo–S configuration, the configuration of Co–O–Mo not only serves as the active center but also provides a conducting channel to facilitate electron conductivity with more accessible charge transfer at the electrode/electrolyte interface, which is favorable for electrocatalytic reaction. This work offers a new perspective for the active mechanism of metallic-heteroatom-dopant electrocatalysts and further boosts research on the development of noble/non-noble hybrid electrocatalysts in the future.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 17
·12374-12387
·
IF 2.993
Ye Zhengqing,Wang Feijun,Jia Chao,Shao Ziqiang
Three-dimensional (3D) O, N-codoped activated carbon aerogels with ultramicropores were prepared via oxidation polymerization, freeze-drying, and carbonization/activation of aniline and sodium alginate. All the O, N-codoped activated carbon aerogels exhibit 3D interconnected hierarchical porous network structures with high specific surface areas (1337–1695 m 2 g −1 ), ultramicropores (0.52–0.54 nm), and rich O (12.68–18.48%) and N (1.18–3.59%) doping. A typical 3D O, N-codoped activated carbon aerogel (ACA700) obtained at the activation of 700 °C exhibits excellent electrochemical performance. When ACA700 is utilized as electrode materials for supercapacitor, the highest specific capacitance of 342 F g −1 at a current density of 2 A g −1 in 3 M H 2 SO 4 electrolyte is achieved. Furthermore, ACA700//ACA700 all-solid-state supercapacitor device displays acceptable energy density (3.8 Wh kg −1 ) at a power density of 246.0 W kg −1 , extraordinary coulombic efficiency (95.8%), and good rate capability. Therefore, the sustainable 3D O, N-codoped activated carbon aerogels with ultramicropores demonstrate tremendous potential for energy storage devices.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2018
·
IF 3.649
Mingqiang Liu,Lishu Shao,Jianhan Huang,You-Nian Liu
The O-containing hyper-cross-linked polymers were synthesized from phenol (2-naphthol) and formaldehyde dimethyl acetal by a simple one-step Friedel-Crafts reaction, they were subsequently carbonized using KOH as the activating agent, and their adsorption to CO 2 was carefully tested. The results indicated that these samples had a high Brunauer-Emmett-Teller surface area (up to 2241 m 2 /g), pore volume (up to 1.20 cm 3 /g), CO 2 uptake (up to 6.3 mmol/g at 273 K and 1.0 bar), and CO 2 /N 2 selectivity (up to 96 for the HCPs, and 22.5 for the porous carbon). In particular, the CO 2 adsorption was highly dependent on the ultramicropore volume (pore width<0.7 nm), while the CO 2 /N 2 selectivity mainly relied on the oxygen content and the ultramicropore structure.
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ChemCatChem
·
2017
·Vol. 10
·期 2
·415-421
·
IF 4.803
Jianwei Ji,Haiwei Guo,Changzhi Li,Zaojuan Qi,Bo Zhang,Tao Dai,Min Jiang,Chuanqing Ren,Aiqin Wang,Tao Zhang
Graphical Chop up the wood : Tungsten-based bimetallic catalysts exhibit high activity and selectivity in the hydrogenolysis of typical model compounds of the α-O-4 linkage in lignin and deconstruction of lignin feedstock for the production of aromatic chemicals. High yields of C−O cleavage products are obtained without destroying the aromatic rings. Tungsten-based bimetallic catalysts M–W/AC (M=Ru, Pt, and Pd; AC=activated carbon) exhibited high activity and selectivity in the hydrogenolysis of typical α-O-4 model compounds and deconstruction of lignin feedstock for the production of aromatic chemicals. Synergy effect was observed between tungsten and noble-metal species, which on the one hand modulated the hydrogenolysis activity of tungsten and improved the activity of catalyst, and on the other hand suppressed overhydrogenation that avoided the formation of cycloalkanes. The conversion of α-O-4 model compounds with different substituents showed that electronic effects play an important role in stabilizing the reaction intermediates, and the electron-donating methoxy group on the aromatic ring accelerated the hydrogenolysis efficiency. Solvent effect was another factor that determined hydrogenolysis efficiency; dipolar aprotic solvents such as n -hexane provided the high yields of target aromatics. In the conversion of realistic lignins, the bimetallic catalyst showed excellent activity not only in α-O-4 cleavage but also in the hydrogenolysis of other major linkages such as β-O-4 and β−β between aromatic units, so that a high yield of liquid oil was obtained from lignin.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 13
·A3303
·
IF 3.259
Qianqing Zhao,Mingqi Li
To develop high-capacity and low-cost carbon material, a novel high-content N, O-codoped C anode material is synthesized using melamine and glucose as starting materials. The as-prepared sample is composed of hierarchical meso-macroporous carbon bulks and graphene-like carbon sheets with 23.5 wt% N and 13.8 wt% O. The high-content N, O-codoped C exhibits high lithium storage capacity, long cycle life and excellent rate capability. At 200 mA g−1 over a voltage window of 0–3.0 V at 25°C, a discharge of about 670 mAh g−1 can be obtained after 500 cycles. Even at 1600 mA g−1, the high-content N, O-codoped C still exhibits a stable discharge capacity of 330 mAh g−1. Compared with the O-doped C and non-doped C materials, the high-content N, O-codoped C shows significant advantages in lithium storage performance, which are attributed to its high surface area, abundant porosity, graphene-like structure and rich heteroatom doping. With the rise of temperature, the lithium storage capacity of the high-content N, O-codoped C increases. With the decrease of delithation cutoff voltage, the reversible capacity of the high-content N, O-codoped C decreases. When assembled a full cell with the LiNi0.5Co0.2Mn0.3O2 cathode, a relatively stable cycling performance can be obtained.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-16
·
IF 14.7
Cao Shiyang,Wang Tong,Ren Yifan,Wu Gengshan,Zhang Yuan,Tan Yafang,Zhou Yazhou,Chen Hongyan,Zhang Yu,Song Yajun,Yang Ruifu,Du Zongmin
Post-translational addition of O-linked N-acetylglucosamine (O-GlcNAc) to proteins is commonly associated with a variety of stress responses and cellular processes in eukaryotes, but its potential roles in bacteria are unclear. Here, we show that protein HmwC acts as an O-GlcNAc transferase (OGT) responsible for O-GlcNAcylation of multiple proteins in Yersinia pestis , a flea-borne pathogen responsible for plague. We identify 64 O-GlcNAcylated proteins (comprising 65 sites) with differential abundance under conditions mimicking the mammalian host (Mh) and flea vector (Fv) environments. Deletion of hmwC , encoding a putative OGT, structurally distinct from any existing member of the GT41 family, results in reduced O-GlcNAcylation, reduced growth, and alterations in virulence properties and survival under stress. Purified HmwC can modify target proteins in vitro using UDP-GlcNAc as sugar donor. One of the target proteins, OsdY, promotes Y. pestis survival under oxidative stress conditions. Thus, our results support that regulation of antioxidative responses through O-GlcNAcylation may be a conserved process shared by prokaryotes and eukaryotes.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2016
·
IF 3.652
Shiliang Wu,Dekui Shen,Jun Hu,Huiyan Zhang,Rui Xiao
The pyrolytic characteristics of cellulose, cellobiose and glucose were examined by TG-FTIR combined with Py-GC–MS, in order to gain the effect of β -O-4 glycosidic bond on the pyrolysis process. In TG-FTIR analysis, two mass loss peaks were observed for cellobiose and glucose, indicating dehydration in low temperature stage and consequently intensive cracking of glycosidic bond and fragments for cellobiose. The samples were tested in Py-GC–MS at the temperature of 300, 500 and 900 °C according to their mass loss characteristics from TG-FTIR. Formation of furans from cellobiose, which involved the cracking of β -O-4 glycosidic bond, was prominent over other products, compared to that of cellulose and glucose. Four possible chemical pathways for the cleavage of β -O-4 glycosidic bond have been proposed with regard to the formation of furans and anhydrosugars from cellulose. Besides, another two reaction pathways leading to the formation of levoglucosan were also suggested.
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