SURFACE & COATINGS TECHNOLOGY
·
2019
·
IF 3.192
Wei Ma,Lin Li,Xuehong Ren,Tung-Shi Huang
Several hybrid membranes were prepared by chemical bonding of N-halamine/ZnO nanoparticles onto poly-ε-caprolactone (PCL) using a free radical polymerization strategy. The chlorination process led to the formation of N-Cl bonds. Hybrid membranes were characterized by scanning electron microscope , Fourier transform infrared spectra , X-ray photoelectron spectroscopy, and thermogravimetric analyzer. The membranes showed quick response in killing bacteria and provided complete inactivation of about 6 logs of inoculated S. aureus (ATCC 6538) and E. coli O157:H7 (ATCC 43,895) within 5 min and 10 min of contact time, respectively. The constructed micro-nano structure also exhibited good hydrophobic, air-permeable, and mechanical performances. Moreover, their prominent UV light stability could decrease the loss of chlorine and the biocidal hydantoin moiety and provide potent antibacterial stability. The obtained data strongly encourage the use of the composite membranes for food packaging.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Xin-Yu Huang,Zong-Tao Chi,Jian Liu,Dong-Hua Li,Xiao-Jun Sun,Cong Yan,Yu-Chong Wang,Hao Li,Xue-Dong Wang,Wan-Feng Xie
Heterostructured semiconductor materials, combining the collective advantages of individuals and synergistic properties, have spurred great interest as a new paradigm toward detecting of volatile organic compounds recently. Direct use of NiS as a sensing material is impractical because the structure of NiS is unstable, exhibiting an undesirable sensing performance. Herein, we firstly report its incorporation into an ethanol gas sensor with a conventional n -type sensitive material of In 2 O 3 , and the gas sensing performance of the NiS@In 2 O 3 nanocomposites has been significantly enhanced. Nanofiber-like NiS and In 2 O 3 were fabricated via a synergetic approach of electrospinning and calcination processes. The diameters of crystalline NiS and In 2 O 3 are about 150 nm and 120 nm, respectively. Then, the NiS@In 2 O 3 nanocomposites were prepared via re-calcination of as-prepared NiS and In 2 O 3 nanofibers. The results show that the sensor based on NiS@In 2 O 3 exhibits a detecting limit of as low as 5 ppm and a short response time of 8 s at the optimum temperature of 300 ºC, which outstripped that (13 s) of pristine In 2 O 3 and pure NiS sensors (21 s) for the detection of ethanol gas. The remarkable improvement of sensing performance can be attributed to the p - n heterojunction in multi-component phases of NiS and In 2 O 3 .
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Zhangping Lou,Sheng Zhao,Quan Wang,Hui Wei
N-doping strategy has been explored to enhance the activity of carbon nanozymes because the reconstructed electronic structures in N-doped carbon nanozymes are advantageous for the catalytic process. However, carbon nanozymes with high N content are still difficult to obtain due to the instability of N element under high calcination temperatures. To address this challenge, here we proposed a new N-doping strategy to fabricate highly active and specific peroxidase-like carbon nanozymes by using a high N-containing polymer (i.e., polyethylenimine (PEI)) as the N source and a natural clay mineral (i.e., montmorillonite (MMT)) as a template, respectively. We showed that the assembly of MMT with PEI protected N loss under high calcination temperatures and thus retained more catalytically active N sites. The mechanism study showed that the hydroxyl radical could be the key intermediate involved in the peroxidase-like catalysis. We then used the optimized carbon nanozyme with high and specific peroxidase-like activity (i.e., CP600–6) to detect H2O2, glucose, and ascorbic acid. Moreover, we successfully determined the total antioxidant capacity (TAC) in real samples including four commercial beverages, fresh orange juice, and three kinds of vitamin C tablets. The current study not only provides a new strategy for fabricating peroxidase-like nanozymes but also develops a facile TAC assay for future use in evaluation of antioxidant food quality and oxidative stress in healthcare.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Qiulin Li,Heng Liu,Long-Cheng Zhang,Hao Chen,Hongjiu Zhu,Yuanke Wu,Maowen Xu,Shu-Juan Bao
Fe-N and pyridinic-N generally are considered the active sites of Fe-N-C catalyst. In this featured work, small uniform Fe/N-rich polymer spheres are selected to prepare the Fe-N-C catalyst and study how the sintering atmosphere (NH 3 , Ar, and H 2 ) to engineer their products. The findings reveal that the sintering atmosphere greatly affected not only the composition , aggregate state, and morphology of Fe, but also the graphitization degree and pore structure of carbon. In addition, XPS results suggest that Fe-N-C-NH 3 possesses the highest Fe-N and pyridinic-N content. Combining its abundant pores, high graphitization, and large specific surface area, the catalyst obtained in NH 3 atmosphere delivers best ORR catalytic performance (E 0 = 0.97 V, E 1/2 = 0.85 V vs RHE), which is even comparable to commercial Pt/C (E 0 = 0.97 V, E 1/2 = 0.83V vs RHE). Moreover, the catalyst exhibits greater stability and methanol resistance than those of Pt/C.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 66
·38891-38896
·
IF 3.049
Qiaohong Zhang,Honghao He,Huibin Wang,Zhan Zhang,Chen Chen
A series of N-alkyl pyridinium salts were synthesized and employed as metal-free catalyst for the selective oxidation of methyl aromatic hydrocarbon with molecular oxygen. The electronic effect of the substitutes was found to be an important factor for the catalytic performance. With the introduction of electron-donating substitute –N(CH3)2, the conversion of p-xylene and selectivity of p-toluic acid could be simultaneously increased. 1-Benzyl-4-N,N-dimethylaminopyridinium salt showed the highest catalytic activity, and 95% conversion with 84% of selectivity to p-toluic acid could be obtained for the selective oxidation of p-xylene. Several methyl aromatic hydrocarbons could all be efficiently oxidized with the reported catalyst at the absence of any metal species.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2019
·Vol. 10
·期 44
·6021-6030
·
IF 4.76
Linfan Shi,Wenyi Wang,Xiong Fu,Yang Yuan,Bin Zhang,Qiang Huang
Ethylene was introduced into cucurbit[n]urils (CB[n]s, n = 5–7) by molecular encapsulation, for comparison with V-type crystalline starch (V-starch) and α-cyclodextrin (α-CD). The encapsulation capacity of inclusion complexes (ICs) followed the order of CB[5] > V-starch > CB[6] > CB[7] > α-CD. X-ray diffractometry, and 13C solid-state nuclear magnetic resonance and Fourier transform infrared spectroscopy confirmed the presence of ethylene gas in the solid matrices. The controlled release kinetics of the ICs were further studied under different storage temperature (4 and 25 °C) and relative humidity (52.9 and 75.5%) conditions. The Avrami equation was adapted to analyze the controlled release kinetics of ethylene gas, showing a diffusion limited mechanism for CB[n]-ICs under all the storage conditions. The ethylene release rate from CB[n]-ICs was accelerated by increasing ambient temperature, but was not sensitive to relative humidity. CB[5] showed the slowest ethylene release rate among the five solid matrices, up to 700 h under 4 °C storage conditions. Molecular simulation suggested two stable molecular conformations for ethylene molecules within the matrices, i.e., type I, two ethylene molecules in the cavity; and type II, one ethylene molecule in the cavity and the other one outside the cavity. CB[5] and CB[6] had a stable type II molecular conformation of ethylene, whereas CB[7] showed similar stability to type I and type II molecular conformations. For the first time, we demonstrated that CB[n]s (particularly CB[5]) are desirable gas storage and release systems for ethylene. This technology can enable precisely controlled and targeted applications of ethylene for food processing and agricultural applications.
✓ 已验证
产品关联
DOI
高影响因子
Current Analytical Chemistry
·
2022
·Vol. 18
·期 9
·1017-1028
·
IF 2.374
Chang Wenzhuo,Zhu Yongxi,Ma Yongjun,Zheng Zhixiang,Wang Chunming
Background: The use of modified electrochemical sensors is essential for the detection of antibiotic drug abuse. The main objective of this article is to develop a silk-derived carbon material for the modification of pyrolytic graphite electrodes (PGE) for the sensitive detection of
chloramphenicol (CAP). Methods: We proposed a pyrolysis synthesis of porous carbon nanosheets (Fe-Silk PNC) using silk as a precursor. Properties of carbon nanosheets had been improved by the Fe-Nx atoms doping, which was attributed to the β-sheet structures and amino-group-rich
chemical structures of silk fibroin, and this material has been used to modify the pyrolytic graphite electrode (PGE) for the electrochemical determination of CAP. Scanning electron microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FT-IR) were used to determine the morphology and
properties of Fe-Silk PNC surface. In the electrochemical determination, cyclic voltammetry (CV) showed a superior current response while bare electrode performed an inferior result. In addition, different scan rate, pH, accumulation time and accumulation potential were carefully optimized,
which proved that this material is appropriate for CAP detection. Finally, differential pulse voltammetry (DPV) method was used for quantitative measurements. Results: In this study, DPV determination of CAP showed the linear relationship with increasing concentration ranged from 1 to
200 μM, and the low detection limit was 0.57 μM (S/N = 3). SEM and FT-IR results further demonstrated the N-doped carbon nanomaterials were successfully synthesized. With excellent sensing performance achieved, the practicability of the sensor has been evaluated to detect CAP in chicken,
shrimps and fish. Conclusion: In summary, a silk derived biomass porous carbon nanomaterial Fe-Silk PNC was simply fabricated and used as a novel electrode material. This kind of novel Fe-Silk PNC modified electrode exhibited excellent sensitivity, anti-interference ability, repeatability,
wide linear rang, and was successfully used for determination of CAP in real samples. Therefore, the biomass derived nanomaterial is expected to be used in new sensing materials.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Chenyu Yang,Xiao Wang,Yongqiang Ren,Shaonan Gu,Qian Wang,Huan Li,Kun Yue,Tingting Gao,Guowei Zhou
Polymetallic oxide nanostructures with intricate architectures have become the promising subject of much recent investigations into high-efficiency electrode materials for lithium-ion batteries (LIBs). However, their smooth implementation is still plagued by the fabrication of multi-component structures as well as the delivered inadequate specific capacities. Here, complex NiFe 2 V 2 O 8 @ N -doped carbon nanostructures with hierarchically porous yolk-double shell spherical architectures via a facile template-free approach are developed and evaluated as the high-efficiency anode materials for LIBs. Benefited from the yolk-double shell constructions, impressively, the electrode harvests a high reversible capacity of 1347.6 mA h g −1 over 200 cycles without visible deterioration at 0.2 A g −1 , a robust rate capability (726.1 mA h g −1 at 5 A g −1 ), and a desirable cycle stability (75.6% capacity retention over 300 cycles at 1 A g −1 ). Such excellent electrochemical Li-ion storage capability is believed to result from the fast ion-diffusion kinetics enabled by the synergetic cation and oxygen redox because of the introduction of vanadium redox couples, which can be further boosted by capacitive-dominated surface electrochemical reaction. This work provides enlightening insights into the elaborate design and fabrication of complex porous yolk-shell-like nanostructures with intricate compositions for high-efficiency lithium storage.
✓ 已验证
产品关联
DOI
高影响因子
COMBUSTION AND FLAME
·
2023
·
IF 4.4
Bingjie Chen,Peng Liu,Bingzhi Liu,Zhandong Wang,Xiang Gao,William L. Roberts
As a representative aromatic component of practical fuels, understanding the low temperature chemistry of 1,2,4-trimethylbenzene under the reaction environment of fuel mixtures is necessary to improve the ignition and combustion process . In this work, low temperature oxidation of 1,2,4-trimethylbenzene was examined in a jet stirred reactor with reactants of n-heptane and 1,2,4-trimethybenzene in a fuel mixture (1:1 in mole, 500–800 K, ϕ = 0.5, τ = 2.0 s, p = 1 bar). Chemical species and their mole fraction evolution with reaction temperatures were recorded by the time of flight molecular beam mass spectrometer using synchrotron vacuum ultraviolet radiation as photon ionization source. Molecular structures of 56 species were identified by comparing the species ionization energies and the photonionization efficiency curves. 25 chemical formula of monocyclic oxygenated aromatics and oxygenated polycyclic aromatic hydrocarbons (OPAH) are detected, and 12 of them are identified. Some of the OPAHs are more toxic than the polycyclic aromatic hydrocarbons, indicating the importance of revealing their formation pathways in low temperature oxidation of aromatics. Numerical simulations using the latest kinetic model from Lawrence Livermore National Laboratory well predict the mole fractions of the reactants and most intermediates, but many monocyclic oxygenated aromatics and OPAHs are missing. The detection and identification of key monocyclic oxygenated aromatics (e.g., peroxides, aldehydes, dialdehydes, and ketohydroperoxides of 1,2,4-trimethylbenzene) provide important clues to unravel the low temperature oxidation pathways of alkylated aromatics like 1,2,4-trimethylbenzene. For monocyclic oxygenated aromatics and OPAHs that are missing in the kinetic model, potential formation pathways were proposed based on the molecular structure information, which might be useful for future kinetic model development.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Xiaoxuan Li,Fei Wu,Wenhua Zhou,Chao Chen,Jianghao Wang,Bolong Li,Hao Chen,Jie Fu
Liquid organic hydrogen carriers have attracted significant attention for hydrogen storage and transportation and have been extensively investigated. Pd-based noble metal catalysts have been reported as some of the most active catalysts, however, achieving an optimal Pd utilization efficiency and stability remains challenging but significant. Herein, a PdCoO x -based bimetallic oxide catalyst was prepared and applied for the low-temperature dehydrogenation of dodecahydro- N -ethylcarbazole (12H-NECZ) to produce H 2 , utilizing the following advantages: (1) the activity of Pd was enhanced by introducing Co to form a PdCoO x bimetallic oxide site; (2) the electronic state of the catalyst was tuned based on the interfacial effect between the PdCoO x and Zr-C 3 N 4 supports. Thus, PdCo bimetallic oxide formation improved the electronic transfer rate and the interaction between the support and PdCoO x , thereby enhancing the catalytic dehydrogenation activity. Consequently, 12H-NECZ was completely dehydrogenated with 95.6 % selectivity at 140 °C for 8 h, with only 2.63 wt% Pd loading.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Wei Rong,Meili Ding,Pan Ma,Suyu Kong,Jianfeng Yao
Accumulation of atmospheric CO 2 poses a serious threat to the global environment, but there is still a lack of effective CO 2 catalytic conversion under mild conditions. Herein, multifunctional ZnO/N-doped porous carbon materials, ZNPC-X, were fabricated by pyrolysis of available pine pollen with melamine and zinc chloride . The optimized ZNPC-600 produced at 600 °C can work as an efficient photothermal catalyst towards CO 2 cycloaddition conversion with a high catalytic yield of 99% under mild conditions (0.3 W/cm 2 , 1 bar). Moreover, ZNPC-600 shows excellent recyclability after ten cycles and desirable performance even under simulated flue gas and after moisture treatment. Absorption spectra and time-dependent infrared images unveil that the intrinsically broad light absorption and high photothermal conversion efficiency are the major reasons for the high activity of ZNPC-600. Besides, photogenerated electrons can be transferred to CO 2 and activate it, while photogenerated holes can be used as Lewis acid to facilitate the ring opening of epoxides. In addition, the hierarchical pore structure and the synergy between ZnO and pyridine N also play a role in the mass transfer and activation of epoxides and CO 2 , respectively. This work provides a low-cost and facile solution to obtain catalysts derived from biomass for promoting CO 2 conversion.
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 37
·e202302830
·
IF 2.1
Hongyan Guo,Shu Wang,Lian Duan,Yue Sun,Shuwei Chen
Graphical A method for the synthesis of Nitrogen-Doped Carbon quantum Dots (N-CQDs) with 4-aminosalicylic acid and tartaric acid is proposed. The synthesized N-CQDs exhibit strong fluorescence and good photostability and can selectively detect CN − in solution. Selective and sensitive detection of Cyanide (CN − ) is critical essential due to it is one of the most lethal chemicals and threat to human health. In this study, nitrogen-doped carbon quantum dots (N-CQDs) were synthesized by one-step hydrothermal method using 4-aminosalicylic acid and tartaric acid as raw materials. The prepared N-CQDs were spherical particles with good water solubility and uniform particle size distribution, the optimal excitation and emission wavelengths of N-CQDs were 495 nm and 514 nm, respectively. Based on the selective fluorescence quenching effect between CN − and N-CQDs, achieving accurate and rapid detection of CN − . Fluorescence quantum yield (PLQY) of N-CQDs is 39 %, and the other competing anions showed little or no interference to CN − . For highly sensitivity detections of N-CQDs under optimal conditions, the fluorescence quenching degree was linearly correlated with the CN − concentration in the range of 0–100 μM (R 2 =0.9929).
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）