Nano Research
·
2018
·Vol. 11
·期 3
·1490-1499
·
IF 7.994
Du Haoran,Huang Kuangfu,Li Min,Xia Yuanyuan,Sun Yixuan,Yu Mengkang,Geng Baoyou
Porous hollow Co 3 O 4 microspheres have been synthesized from a mixed cobalt nitrate and urea solution through spray pyrolysis followed by calcination at 600 °C in air. This porous hollow Co 3 O 4 is assembled by nanoparticles and exhibits variable porosity depending on the amount of gas in the system. In pyrolysis process, urea continuously decomposes into gaseous components, which act as a template to control the porous structure. The amount of gas escaping from precursor droplets can directly influence the porosity of the microspheres and the size of the nanoparticles controlled by the ratio of urea to cobalt nitrate. Electrochemical measurements show that the performance of the porous hollow Co 3 O 4 microspheres is related to the porosity and size of the nanoparticles. The sample with optimal porosity delivers a high first charge capacity of 1,417.9 mAh·g −1 at 0.2C (1C = 890 mA·g −1 ), and superior charge cycle performance of 1,012.7 mAh·g −1 after 100 cycles. In addition, the optimized material displays satisfactory rate performance of 1,012.4 mAh·g −1 at 1C after 50 cycles and 881.3 mAh·g −1 at 2C after 300 cycles. Superior charge/discharge capacity, excellent rate performance and high yield achieved in this study is promising for the development of high-performance Co 3 O 4 anode materials for lithium-ion batteries.
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RSC Advances
·
2018
·Vol. 8
·期 17
·9074-9082
·
IF 2.936
Lin-Ning Zhang,Long Wang,Zi-Qi Shi,Ping Li,Hui-Jun Li
The extreme complexity of the chemical composition of plant extracts requires an unbiased and comprehensive detection methodology to improve the potential of metabolomic study. The present work, taking five closely related cultivars of Chrysanthemum flowers as a typical case, attempts to develop a metabolomic strategy to find more markers of metabolites for precise differentiation based on headspace gas chromatography-mass spectrometry (HSGC-MS) and ultra-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UHPLC-QTOF/MS). In detail, 53 batches of Chrysanthemum flower samples were collected and analyzed. The fusion of datasets from HSGC-MS and UHPLC-QTOF/MS was done in two different ways. After comparison, the fusion of the total peak area normalized metabolomic data was performed for multivariate statistical analysis. A total of 21 marker compounds (including 14 volatile and 7 nonvolatile metabolites) were identified, and a heatmap was employed for clarifying the distribution of the identified metabolites among the five cultivars. The results indicated that the integrated platform benefited the metabolomic study of medicinal and edible herbs by providing complementary information through fully monitoring functional constituents.
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TALANTA
·
2011
·
IF 3.722
Xin Zhou,Xiao Shao,Jian-jun Shu,Ming-ming Liu,Han-lan Liu,Xiong-han Feng,Fan Liu
A novel sol–gel-coated ionic liquid-based ([AMIM][N(SO 2 CF 3 ) 2 ]–OH-TSO) fiber was successfully applied for the determination of phthalate esters (PAEs) in agricultural plastic films by ultrasonic extraction (UE) combined with solid phase microextraction–gas chromatography (SPME–GC) due to its high thermal stability, specific selectivity and extraction efficiency. The extractant for UE and the adsorption time for SPME were optimized to achieve higher extraction efficiency. The desorption temperature and time were also optimized to avoid the carryover effect of previous extraction, and ultimately improve the precision and accuracy of the method. The [AMIM][N(SO 2 CF 3 ) 2 ]–OH-TSO fiber showed comparable, or even higher response to most of the investigated PAEs than the commercial PDMS, PDMS–DVB and PA fibers. The carryover problem, often encountered when using commercial fibers, had been eliminated when desorption was performed at 360 °C for 8 min. The proposed SPME–GC method showed good linearity over three to four orders of magnitude, and low limits of detection ranged from 0.003 to 0.063 μg L −1 . The relative standard deviation values obtained were below 10%, and the recoveries were in the ranges of 90.2–111.4%. Some of the PAEs studied were detected at very high concentration in these agricultural plastic film samples, resulting in a potential risk of crop damage, environmental contamination and human health exposure.
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ANALYTICAL LETTERS
·
2024
·
IF 1.6
Cheng Qian,Pei Zhang,Chao Nie,Hui Jiang,Linghu Cai,Xiangyu Chen,Minghua Liu
Green MgO-based banana peel activated carbon (MgO-BPAC) with distinctive pore structure features was synthesized with magnesium nitrate as the template and activator. A novel solid-phase microextraction (SPME) fiber was prepared by fixing MgO-BPAC on the surface of a stainless-steel wire using silicone sealant. The fiber was coupled with gas chromatography-mass spectrometry (GC-MS) for headspace-solid phase microextraction-GC-MS (HS-SPME-GC-MS) for polycyclic aromatic hydrocarbons (PAHs). The laboratory-constructed fiber showed good extraction efficiency for naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, and anthracene and the corresponding analytical parameters were determined. The method provided low detection limits (0.86–2.12 ng/L) with satisfactory replicate extractions of one fiber (relative standard deviations ≤ 10.30%) and fiber to fiber reproducibility (relative standard deviations ≤ 13.92%). To validate the performance of the homemade fibers, this approach was used for the determination of the PAHs (0.05 μg/L) in spiked environmental water samples and good recoveries (92.67%–114.45%) were obtained. This study introduces a biocarbon material as a functional fiber coating component which adsorbs aromatic constituents through hydrophobic interactions.
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Food Science and Human Wellness
·
2024
·
IF 5.6
Yufei Liu,Xiaonian Cao,Zhilei Zhou,Qingxi Ren,Zhongwei Ji,Min Gong,Yuezheng Xu,Weibiao Zhou,Shuguang Chen,Jian Mao
Higher alcohols are key factors affecting sensory quality and post-drinking comfort of alcoholic beverages. A strategy combining solid-phase extraction and gas chromatography-mass spectrometry (SPE-GC-MS) was established to analyze the metabolism pattern of higher alcohols in rat plasma after gavage of 4 common alcoholic beverages including huangjiu, baijiu, wine and brandy. 7 mL of dichloromethane was determined as the optimal extraction condition, and 8 higher alcohols were precisely quantified with detection limits of 1.82−11.65 μg/L, recoveries of 89.07 %−110.89 % and fine repeatability. The fastest absorption and elimination rates of plasma total higher alcohols were observed in baijiu and huangjiu group, respectively, and the highest peak concentration was found in brandy group. Additionally, the metabolic rate of plasma isoamyl alcohol in huangjiu group was faster than that in wine group at the same intragastric administration dosage. This study may provide potential insight for evaluation of alcoholic beverage quality.
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ACS Catalysis
·
2025
·
IF 13.1
Shengpeng Mo,Shuangde Li,Jiangjing Zhou,Xin Zhao,Huimin Zhao,Xiaobin Zhou,Yinming Fan,Zongqiang Zhu,Bing Li,Qinglin Xie,Wenzhe Si,Yunfa Chen,Daiqi Ye,Junhua Li
A concentrated solar reaction device has been designed for the solar-driven photothermal CO2 reverse water–gas shift reaction, in which solar-to-chemical conversion efficiency would be up to 26% via a concentrated solar panel. Meanwhile, a special photothermal Ni–C–In catalyst (Ni/C–In2O3) with interstitial C, the In3Ni2 intermetallic compound, and disordered Ni clusters has been synthesized. As a result, the SO2-tolerant Ni/C–In2O3 catalyst exhibits an outstanding solar-driven photothermal catalytic performance (near thermodynamic limitation) with 100% CO selectivity and a 20.96 mmol gcat–1 h–1 CO production rate for solar-driven CO2 hydrogenation under concentrated solar irradiation (around 1521.9 mW/cm2) even sunlight without external heating. The incorporation of interstitial C and exposed Ni clusters in the Ni–C–In intermetallic catalyst could strengthen intensive solar light absorption. Moreover, quasi in situ XPS and DFT theoretical calculation results validate that asymmetric interaction between interstitial C and the Ni-cluster not only effectually regulates the electronic structure of the Ni–C–In intermetallic catalyst but also greatly optimizes the activation of H2 and CO2 molecules and the energy barriers of key reaction dynamics (HCOO* formation and dehydrogenation) in the RWGS reaction. Accordingly, this study provides a promising strategy for the electronic structure modification of photothermal functional catalysts with C modification to boost CO2 hydrogenation, putting forward an important step toward practical solar-to-fuel production with concentrated natural sunlight.
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Nano Materials Science
·
2025
·
IF 17.9
Haineng Bai,Cheng Feng,Yiru Chen,Yunxiao Du,Yamin Feng,Kuili Liu,Yali Yan,Jia Liu,Baohua Zhang,Jin Wang,Dunjun Chen,Youdou Zheng,Fuqiang Guo
The porous NiO nanoplates modified with rGO nanosheets and SnO 2 nanoparticles are developed for accurate and rapid ppb-level NO 2 detection. The developed SnO 2 /NiO/rGO sensor towards 50 ppm NO 2 gas demonstrates an excellent gas-sensing response of 14.8 at 23 °C, which is 3.03 times that of NiO/rGO sensor (4.89) and 6.49 times that of NiO sensor (2.28), respectively. The developed SnO 2 /NiO/rGO sensor exhibits faster response/recovery speed (12.7/32.8 s @5 ppm), with extra-low theoretical detection limit of 0.15 ppb at room temperature. More fascinatingly, our sensors indicate great sensitivity, outstanding repeatability and long-term stability for longer than 7 weeks. Additionally, it also suggests that 1 °C and 1 % relative humidity have the same effect on the SnO 2 /NiO/rGO sensor signal as approximately 13 ppb and 7.0 ppb NO 2 gas change, respectively. Such excellent properties are mainly attributed to the large surface-to-volume ratio, which provides active sites to NO 2 gas spread, adsorption and diffusion on material surface in redox reaction. Moreover, the ternary heterojunctions formed by NiO, rGO and SnO 2 may serve as highly conductive channels to accelerate carrier transfer and abundant oxygen vacancies to reduce the adsorption energy for O 2 and NO 2 gas, thus further improving performance of the sensors.
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ECS Journal of Solid State Science and Technology
·
2025
·Vol. 14
·期 2
·027005
·
IF 2.2
Wenhao An,Xinru Chang,Song Guo,Jianing Zhang,Huadong Cui,Zhendong Tang
Premixed stagnation flame method was used to synthesize Yttrium manganate (YMnO3) nanoparticles to investigate the precursor species' effect on the resulting products' physical phase formation. In addition, the sensitivity of sensors constructed with the most efficient combination of precursors for detecting hydrogen sulfide (H2S) was evaluated. Based on thermal breakdown and infrared spectra analysis, Y(NO3)3·6H2O and (CH3COO)2Mn·4H2O have been shown to be the best precursors. The resulting YMnO3 phase exhibited the highest purity, with numerous small tetrahedral particles averaging 20 nm in size attached to the surface of larger spherical particles. The assembled particles displayed a uniform size distribution ranging from 400 to 600 nm. The YMnO3 sensors showed the most favorable response to 30 ppm H2S gas at 220 °C, achieving a response value of 2.94. It demonstrates excellent selectivity, repeatability, and long-term stability. The premixed stagnation flame method can be used to fabricate nanoparticles with complex composition or structure at low cost, such as hollow structure, core–shell structure or multivariate metal oxide. The porous structure of the synthesized spherical YMnO3 nanoparticles has the advantages of small particle size and large specific surface area, showing excellent gas sensitive properties.
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FUEL
·
2024
·
IF 6.7
Xiaoxiao Ding,Yatao Yang,Weihong Jiao,Zequan Zeng,Zhanggen Huang
The heteroatom doping into the activated carbon (AC) has been proved to be one of powerful tools to remove dioxins from sintering flue gas. However, the fact that the intrinsic enhanced mechanism of specific nitrogen species still remains unanswered makes the choice and design of AC suitable for dioxins elimination difficult. Herein, nitrogen-doping AC with alterable N species were prepared by melamine modification to in-depth illuminate the promotional roles of N-containing groups on the adsorption of chlorobenzene (CB) (a model compound for dioxins) over ACs through experimental and density functional theory (DFT). The results demonstrated that the N-doping was obviously conducive to CB adsorption, and pyrrole N group with the strongest adsorption energy (−0.84 eV) between AC-pyrrole and CB was determined to be the key adsorption sites for CB. ACM600 with more pyrrole N group prominently improved the chemical adsorption of total adsorption amount from 8.18 % to 15.12 %. The adsorption mechanism of CB onto ACs was governed by physical adsorption and weak chemical adsorption, which was attributed to the synergistic effects of π-π stacking interaction and hydrogen bonds, and the π-π stacking interaction dominated the adsorption interactions. The introduction of heteroatom N enhanced the adsorption capacity by promoting the chemical reactivity and π-electron density distribution of AC, and forming more significant π-π stacking interaction with the π-acceptor. The study provided a sound theoretical guideline and scientific foundation for the design and estimation of carbonaceous materials for dioxins abatement.
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POLYMER
·
2025
·
IF 4.5
Pengkai Qin,Linbo Wu,Suyun Jie
Two series of high molecular weight aliphatic-aromatic random copolyesters: PBXT, where X represents the carbon atom number of the aliphatic α,ω -diacids, PBXT 48 and PBXT 50w (X = 4–14, even), with molar and mass copolymer compositions (48 mol% and 50 wt%) equal to those of commercial poly(butylene adipate-co-terephthalate) (PBAT) were synthesized from butanediol, terephthalic acid and various aliphatic α , ω -diacids. They were characterized with 1 H NMR, and their melt crystallization, optical, mechanical and gas barrier properties were assessed. In these copolyesters, the melt crystallization of butylene terephthalate (BT) sequence is dominant, while the butylene adipate (BX) sequences can also crystallize from melt when the BX content is high enough, the chain length of α , ω -diacid unit or the crystallization time is long enough. Long enough chain length of α , ω -diacid unit ( X ≥ 6) endows PBXT with sufficient chain flexibility/mobility and, therefore, excellent melt crystallizability at rapid cooling. For PBXTs with X ≥ 6, the effect of X on BT crystallization is not monotonic. In particular, both PB6T and PB12T displayed a higher melt crystallization temperature than the adjacent PBXTs. Compared to PB6T, PB4T has higher transparency and gas barrier properties; with increasing X from 6 to 14, the PBXTs show increased transparency and water vapor barrier, but decreased oxygen barrier performance. The tensile modulus and strength of PBXT decrease, and the elongation at break increases with increasing X . But the effect of X is clearly weakened for PBXTs with the same mass composition of 50 wt%.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Ao Tang,Huijie Nie,Jialin Zhang,Zhuo Chen,Jie Dong,Xin Zhao,Xiuting Li,Qingsong Xu,Qinghua Zhang
Breaking the trade-off effect between permeability and selectivity and preparing membranes with an excellent comprehensive separation performance is a relentless pursuit in the field of membrane separation technology. Herein, a new series of crosslinked thermally rearranged poly(imide- co -benzoxazole) membranes were successfully synthesized with greatly improved comprehensive gas separation performance. The o rtho -hydroxycopolyimide precursor was synthesized by reacting the newly designed dianhydride bearing the amide structure and thermally crosslinkable benzyl groups, N, N'-(2,4,6-trimethyl-1,3-phenylene)bis(1,3-dioxo-1,3-dihydroisobenzofuran-5-carboxamide) (MPADA), with hexaffuoroisopropylidene diphthalic anhydride (6FDA) and thermally rearrangeable diamine, 2,2-bis(3-amino-4-hydroxyphenyl)- hexafluoropropane (6FAP). Sequential thermal treatment at 375-450 °C under air and at 450-465°C under N 2 resulted in the benzyl-induced crosslinking reaction and thermal rearrangement (TR) reaction of ortho -hydroxyimide, respectively, within the precursor membrane. It demonstrates that the above reactions combined with the inherently existing interchain hydrogen bonding not only effectively expand the chain packing enabling microporous structure for gas transport but also introduce multi-scale microporosity via the unique dual crosslinked network that allows for molecular sieving capability in the resulting membrane. The resulting membranes exhibited a remarkable CO 2 permeability (341.2 Barrer) and ideal CO 2 /CH 4 selectivity (53), which outperformed some typical thermally rearranged polymer membranes and the state-of-the-art 2008 upper bound for CO 2 /CH 4 separation. More importantly, the resulting membranes demonstrated a superior anti-aging and high anti-plasticization property attributed to their highly stable molecular skeleton structure. This work provides a reliable route for constructing polymeric membranes with highly improved gas separation performance and stability.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Li Wan,Xiang-Long Ding,Bo Liu,Yue-Fei Zhang,Jin-Rong Zhong,Yi-Min Dai
This study investigated anionic guar gum derivatives as dual-purpose inhibitors for methane hydrate formation and metal corrosion in oil and gas pipelines. Sulfonated guar gum (SHG), phosphorylated guar gum (PGG), and guar gum grafted acrylamide (GG-g-PAM) were synthesized and evaluated for their kinetic hydrate inhibition and corrosion inhibition properties. The results demonstrated that all anionic guar gums exhibited superior inhibition effects compared to native guar gum and polyvinylpyrrolidone (PVP), with GG-g-PAM achieving the highest maximum subcooling of 10.47 °C at the concentration of 0.5 wt%. SHG showed the most pronounced effect during the hydrate growth stage, and exhibited the best corrosion inhibition efficiency as well, with a significant inhibition efficiency (>92 %) at 0.5 wt%, surpassing other additives and a commercial imidazoline inhibitor. The formation of a protective film on carbon steel, enhanced by anionic groups, was confirmed through increased contact angles and reduced corrosion rates. Electrochemical impedance spectroscopy (EIS), polarization curves and SEM-EDX spectra further substantiated the effectiveness of the anionic guar gums in preventing carbon steel corrosion in CO 2 -saturated environments. The findings underscore the potential of anionic guar gum, particularly SHG, as a sustainable and effective bio-based additive for simultaneous hydrate inhibition and corrosion protection in oil and gas pipelines.
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