NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 22
·9522-9529
·
IF 3.288
Hengbo Zhang,Fuquan Niu,Shaoyu Li,Yanhong Yin,Hongyu Dong,Hongyun Yue,Zhaoxia Cao,Shuting Yang
Highly effective bifunctional oxygen electrocatalysts play a key role in fuel cells (FCs), metal–oxygen batteries, and water splitting devices. In this paper, metal organic layer (MOL) derived Co/Co9S8 nanoparticles coated with N,S co-doped graphene-like carbon nanosheets were synthesized with the help of the space-confinement effect of montmorillonite (MMT). The as-prepared material shows excellent electrocatalytic activity both for oxygen reduction and oxygen evolution reactions in 0.1 M KOH solution: its ORR onset potential is 0.93 V (vs. RHE) and the limiting diffusion current density is 4.7 mA cm−2. Moreover, the retention of current for the as-prepared material is 85% after a stability test for 10 000 s for the ORR, while those of the template free catalyst and commercial Pt/C glided below 80%. Additionally, its Tafel slope is 265 mV dec−1, which is much smaller than that of the control sample, suggesting the excellent OER kinetics. The excellent catalytic activity and stability can be attributed to the relatively higher specific surface area, higher number of pyridinic-N and Co–Nx active sites, and higher graphitization degree compared to the template free catalyst.
✓ 已验证
产品关联
DOI
高影响因子
Food Analytical Methods
·
2017
·Vol. 11
·期 3
·790-796
·
IF 2.038
Liang Xu,Feng Ting-Ting,Wu Jian-Hai,Du Ming,Qin Lei,Wang Zhen-Yu,Xu Xian-Bing
Vortex-assisted liquid-liquid micro-extraction (VALLME) was applied for eliminating the matrix effect and improving the sensitivity of eugenol determination by headspace solid phase micro-extraction (HS-SPME) coupled with gas chromatography-mass spectrometer (GC-MS) in fish samples. Under the optimum condition of VALLME and HS-SPME, the good linearity of eugenol in fish samples was obtained in the range from 15.0 to 750.0 μg/kg. The limit of detection (LOD) and the limit of quantification (LOQ) for eugenol were 0.5 and 1.5 μg/kg, respectively. The recovery of eugenol was ranging from 95.4 to 119.9% and the relative standard deviation (RSD %) for eugenol was lower than 20%. The results turned out that VALLME followed HS-SPME-GC-MS was a simple, rapid, and accurate method for the determination of eugenol in fish samples. The levels of eugenol in different parts of real samples were tested by the developed method, and the results concluded that the developed method was compatible with GC-MS analysis with long-term application and had excellent repeatability, linearity, and sensitivity.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Zhenyu Li,Huifeng Deng,Yu Jiang,Jianbin Ju,Xiaowen Huang,Lang Zhang,Guihua Ruan,Zhengyi Chen,Yipeng Huang
Portable fluorescence-based Cs + radionuclide sensing has received great concerns yet challenged by interference in complex sample matrices. Herein, a reliable method was established by in situ converting the preconcentrated Cs + to CsPbBr 3 perovskite nanocrystals in mesoporous silica modified with dibenzo 24-crown-8 ethers (DB24C8E-SiO 2 ), which combined the selective extraction of Cs + with in situ fluorescence derivatization to achieve good anti-interference ability. The high adsorption capacity (49.5 mg g −1 ) of DB24C8E-SiO 2 for Cs + and elution-free operation enabled enrichment factor up to 4500, which was conducive to reducing the limit of detection (LOD) for Cs + . By this method, the fluorescence intensity linearly increased with the Cs + concentration from 0.050 μg mL −1 to 100 μg mL −1 with an LOD of 0.017 μg mL −1 (S/N = 3). The concentration of Cs + in seawater sample was detected to be 0.056 μg mL −1 . The recoveries of Cs + in spiked samples remained above 88.90 % and the relative standard deviations were less than 12.06 %. In addition, the relative errors of this method were within ±13.2 % compared with the result from atomic absorption spectrometry. The study demonstrated the high potential of the method for removal and portable detection of Cs + .
✓ 已验证
产品关联
DOI
高影响因子
TETRAHEDRON-ASYMMETRY
·
2014
·
IF 2.165
Rui-Jie Chen,Gao-Wei Zheng,Yan Ni,Bu-Bing Zeng,Jian-He Xu
A new NADH-dependent carbonyl reductase Rh CR capable of efficiently reducing the ε-ketoester ethyl 8-chloro-6-oxooctanoate (ECOO) to give ethyl ( S )-8-chloro-6-hydroxyoctanoate [( S )-ECHO], an important chiral precursor for the synthesis of ( R )-α-lipoic acid, was identified from Rhodococcus sp. ECU1014. Using recombinant Escherichia coli cells expressing Rh CR and glucose dehydrogenase used for the regeneration of cofactor, 440 g L −1 (2 M) of ECOO were stoichiometrically converted to ( S )-ECHO in a space–time yield of 1580 g L −1 d −1 without the external addition of any expensive cofactor.
研究领域:
生物催化
·
酶工程
·
合成化学
·
生物技术
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Fei Xie,Hanke Li,Jinxin Liang,Zhenwei Liu,Tongmei Ma,Canghao Xie,Ben Dong,Dan Li,Sheng Chen,Huai-Ning Zhong
574 NVOCs comprising 367 oligomers identified in 70 batches of PLA/PBAT-starch FCMs. • Chemical spaces reveal distinct yet characteristic distribution patterns for the oligomers. • PLS-DA discloses intrinsic connections between the NVOCs and the sample categories. • The contents of 142 NVOCs change monotonously with the PBAT/PLA contents. • 16 high-risk NVOCs are prioritized with 14 of them being carcinogenic or genotoxic. The burgeoning demand for biodegradable food contact materials (FCMs) based on polylactic acid (PLA), poly(butylene adipate-co-terephthalate) (PBAT), and starch arouses increasing chemical safety concerns, yet the non-volatile organic compounds (NVOCs) therein remain insufficiently investigated. Herein, 574 NVOCs were identified in 24 batches of blend pellets with designated polymeric contents and 46 batches of PLA/PBAT-starch-based food contact articles (FCAs) by dissolution-precipitation coupled with untargeted liquid chromatography – high resolution mass spectrometry, and exhibited characteristic distribution patterns in the molecular-descriptor-derived chemical spaces. Chemometric analyses further identified the oligomers as essential markers to differentiate samples of various categories. Furthermore, the contents of 142 NVOCs were found to correlate with PBAT contents, due to either inherent presence in the polymers or starch-induced transformation. In addition, hazard identification unveiled that molecule complexity (FMF) of the NVOCs was a statistically significant indicator of chemical hazards, and subsequent risk assessment identified 16 potentially high-risk NVOCs, wherein 14 of them are subjected to carcinogenic or genotoxic risk, and 10 of them are identified via migration assays. This work presents an effective paradigm for uncovering the sophisticated chemical profile of biodegradable FCMs, thus being beneficial to fostering the chemical safety of FCMs and related products. Download: Download high-res image (146KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Na Zhang,Yufei Zhang,Ting Wang,Wenqing Ge,Tiezhu Zhang,Lipeng Zhang,Weimin Zhang
Silicon-based materials are promising high-capacity anodes for lithium-ion batteries (LIBs). However, they suffer from rapid fracture and pulverization due to extreme volume expansion (theoretically higher than 300%) during the alloying/dealloying reactions with Li. In this work, we demonstrated a simple and mild method by using calcium carbonate as the template to prepare a Si/carbon-based anode material with rich void space (Si@void@C) for LIBs. The yielded void space successfully accommodated the large volume change during the cycling process. The electrochemical characterization verified that the Si@void@C anode exhibited an excellent specific capacity of 973.2 mA h g −1 and high-capacity retention of 84.9% after 100 cycles at a current density of 300 mA g −1 . The morphological study also confirmed that the Si@void@C electrode exhibited the lowest volume changes after many cycles of the charge/discharge process among the electrodes. In addition, the comprehensive performance of Si@void@C was remarkably better than those of Si@C and bare Si electrodes. Hence, Si@void@C is a promising high-capacity anode for next-generation LIBs.
✓ 已验证
产品关联
DOI
高影响因子
Nano Futures
·
2020
·Vol. 4
·期 3
·035002
·
IF 2.982
Hongyu Yin,Lili Bi,Zhen Wu,Guixin Wang,Mian Li,Xiaobing Zhou,Shulin Ji,Wang Zhang,Yongwu Peng,Jun Pan,Cui Ye,Qing Huang
Interest has been growing in electromagnetic interference (EMI) shielding materials in view of soaring EM radiation and its pollution control, which is necessary for public health and normal communication. To realize high EMI shielding effectiveness (SE), two factors of high electrical conductivity and strong multiple reflections are quite important. However, it is still a big challenge to obtain these two characteristics simultaneously in one material system. Here, we present a lightweight composite film integrating silver nanowires (AgNWs) as the skeleton and MXene as the covering decoration (AgNWs/Ti3C2Tx) for foaming structure. The composite film exhibits a low density of about 1 g cm−3 and an electrical conductivity of up to 15 038 S cm−1, which give a superiorly high specific EMI SE per unit thickness of 270 997 dB · cm2 g−1, and an EMI SE of 41.3 dB at a thickness of 1.2 μm (or 96.7 dB at a thickness of 40 μm) in the X-band. A film formation method of positive pressure filtration helps to easily control free space created during foaming for adequate EM wave scattering, yet remaining within the skin depth and strong multiple reflections have been achieved. The superior EMI shielding properties make the lightweight AgNWs/Ti3C2Tx composite film a promising candidate in high-end applications.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2014
·
IF 3.065
Xingchu Gong,Yao Li,Zhengtai Guo,Haibin Qu
To provide a new method to develop a design space to improve the robustness of drug manufacturing processes based on the control of noise parameter influences, the ethanol precipitation process of Danhong injection was investigated as a sample. Water content in the concentrated extract (WCCE), the concentration of ethanol (CEA), and the amount of ethanol added (AEA) are three adjustable parameters. The effects of refrigeration temperature (RT) was investigated on three levels for simulating its fluctuations. The models between parameters and process critical quality attributes (CQAs) were obtained using a simplified central composite design with determination coefficients more than 0.84. The decrease of RT led to lower active ingredient recoveries and higher DMR. The increase of CEA and the decrease of WCCE caused more precipitation. The decrease of CEA or AEA resulted in higher active ingredient recoveries. The design space was calculated using an exhaustive search-Monte Carlo method and normal operation ranges were also obtained. The results of verification experiments agreed well with prediction results. The proposed method can be used to develop a design space applicable in a larger scale manufacturing process with the negative effects caused by the fluctuations of noise parameters controlled.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Wei Li,Siyuan Cao,Xu Yin,Qi Zhang,Liankai Gu,Hongwei Zhu,Kajia Wei,Weiqing Han
Seeking efficient and facile methods for precise oxygen vacancy (Ov)-content regulation is challenging for practical application. Herein, we propose a confinement-based Ov optimization strategy, and construct Fe 3 O 4 with controllable Ov confined in S-doped mesoporous carbon (Fe 3 O 4 @SMC) catalyst to enhance nonradical oxidation of PMS. The confinement effect induced the O 2p orbitals p-band-center shift in Fe 3 O 4 @SMC, which promoted Ov formation, thus achieving 100 % BPA degradation within 9 min via an electron-transfer process (ETP) dominated nonradical pathway with a 125.8-fold higher k obs value than unconfinement catalyst. Ov content variation under confinement, triggered by tuning confined support defect level, steered nonradical transition from single-electron-activated singlet oxygen route to two-electron-transferred ETP pathway, which improved selectivity (> 95 % of electron-rich pollutants removal), adaptability and durability (10 h continuous-flow operation) of catalyst. This work paves the way for modulating Ov in iron-oxides via confinement engineering and offers new insights into the Ov-induced mechanism in confined environments.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Qi Sun,Kun Tian,Sihan Liu,Qing Zhu,Shuai Zheng,Jing Chen,Liping Wang,Si Cheng,Zhen Fan,Xupeng Fan,Dezhi Wang,Chunyan Qu,Changwei Liu
Low density aerogels with high fatigue resistance are widely used in the manufacturing of core material structures in aircraft fuselage to be able to tolerate the extreme environment of aerospace. However, most organic aerogel materials have poor energy absorption of external impact forces, and are prone to irreversible deformation , such as contracture and collapse in the process of long-term service. In order to solve this problem, a new type of thermosetting-thermoplastic polyimide composite aerogel was prepared, with its microstructure presenting the coexistence of the inner and outer skeletons. The intermolecular forces promoted the assembly of the soft thermoplastic layer and the strong thermosetting layer in the thermodynamic process with 4.63–6.55 μm range. The hard-soft layer structure improved the compressive and the shear load bearing capacities by bending of the panel (Compressive modulus is 1.60 MPa–3.52 MPa, tensile modulus is 1.04 MPa–1.45 MPa). Its permanent degradation less than 1.5 % after 500 cycles at 30 % strain. C–CPIAs also exhibited excellent heat resistance and thermal insulation performances, with a T 5% value of 612 °C (C-CPIA-2), T g of 458 °C (C-CPIA-3). The sandwich materials can be used as outer protective composite material of aircraft fuselage for future deep space missions .
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 23
·9453-9458
·
IF 1.938
Youhong Ai,Faqiong Zhao,Baizhao Zeng
In this work, a novel poly(aniline-co-m-aminobenzoic acid)–ionic liquid composite coating is presented for the head-space solid phase microextraction (HS-SPME) of aryl halides (i.e. chlorobenzene, bromobenzene, 1,4-dichlorobenzene, 4-bromotoluene, and 1,2,4-trichlorobenzene). This coating was prepared on a platinum wire by electrochemical deposition in an aqueous solution containing 0.1 mol L−1 aniline, 0.1 mol L−1m-aminobenzoic acid, 0.02 mol L−1 1-butyl-3-methylimidazolium tetrafluoroborate and 1.0 mol L−1 HNO3. It showed high mechanical stability, thermal stability (up to 320 °C) and durability (repetitively used for more than 120 times). When it was applied to the HS-SPME and gas chromatographic detection of aryl halides, it presented high repeatability and sensitivity. Under the optimized conditions (i.e. extraction temperature: 30 °C; extraction time: 30 min; stirring rate: 600 rpm; NaCl concentration: 0.35 g mL−1), the linear detection ranges were 0.2–100 μg L−1 with correlation coefficients above 0.9922; the detection limits were 0.01–0.05 μg L−1 (S/N = 3). The relative standard deviations (RSDs) of chromatographic peak areas were smaller than 5.3% for five successive measurements with a single fiber, and the fiber to fiber RSD was 2.4–9.5% (n = 3) for different aryl halides (50 μg L−1). This method was successfully applied to the determination of real samples (i.e. moth balls) and the recoveries for the standard added were 85.7 % to 121%.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yun Cai,Haibo Shu,Fengjiao Yu,Yang Yang
Radial heterostructures with titanium dioxide (TiO 2 ) nanowire as core and NTU-9 as shell are synthesized via a surfactant-free approach based on the favorable bonding of linkers with TiO 2 nanowire. Relative to the traditional growth strategy of surface modification, the thin NTU-9 shell with ordered arrangement of two-dimensional networks is uniformly formed on the sidewalls of TiO 2 nanowire through the orientational growth process. Using the core–shell nanowire arrays as photoanodes , wide-range light absorption and high charge carrier separation efficiency are achieved due to the conjugation of NTU-9, leading to enhanced water oxidation performance in photoelectrochemical (PEC) water splitting. Under appropriately low applied potentials, the photogenerated holes are preferable to accumulate at TiO 2 /NTU-9/electrolyte three-phase interface and thus the long-range ordered NTU-9 shell can also serve as a size-exclusion filter to improve selectivity toward molecules of different sizes. Consequently, the TiO 2 /NTU-9 core–shell nanowire array exhibits an augmented and selective PEC response for small size molecules ( e.g., H 2 O 2 ) at a very low potential (–0.25 V vs Ag/AgCl), outperforming the pure TiO 2 nanowire array and the counterpart with a grain-boundary-rich NTU-9 shell that is prepared by pretreatment of the TiO 2 nanowires with PVP functionalization.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）