DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 29
·10183-10189
·
IF 4
Wenhao Xing,Kaijin Kang,Jian Tang,Chunlan Tang,Wenlong Yin,Bin Kang,Jianguo Deng
Stability is a key factor that restricts the practical applications of metal–organic framework (MOF) materials. In this work, we report an ultrastable three-dimensional cage-like MOF, SrCu(HC3N3O3)2, constructed by a polydentate cyanurate ligand and two kinds of different metal nodes. A high ratio of coordination sites in organic ligands, specific coordination of strong acid with a strong base and weak acid with a weak base and double independent completed coordination networks endow SrCu(HC3N3O3)2 with outstanding thermal stability (up to 300 °C) and acid/alkali resistance (pH = 2–14). Moreover, SrCu(HC3N3O3)2 possesses the highest porosity up to 36.7% among cyanuric acid-based MOF materials and exhibits differentiated adsorption of C3H4 (63 cm3 g−1) and C3H6 (51 cm3 g−1). The breakthrough experiment further verified that efficient C3H4/C3H6 separation can be achieved under dynamic conditions by SrCu(HC3N3O3)2.
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JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 22
·期 5
·2263-2270
·
IF 5.101
Qi Zheng,Yongheng Zhu,Jiaqiang Xu,Zhixuan Cheng,Huimin Li,Xinxin Li
Two new mesoporous SBA-15/organic hybrids featuring fluoroalcohol and fluorinated-phenol derivatives were successfully synthesized via a co-condensation route. Hexafluorobisphenol and hexafluoroisopropanol were chosen to graft onto mesostructured silica, respectively. The as-synthesized hybrids preserve their mesoscopic structures with relative large surface areas and pore volume, as confirmed by SAXS, TEM and N2 adsorption–desorption porosimetry. Moreover, FT-IR and solid-state MAS NMR spectroscopy proved covalent anchoring of the organic functional groups onto the SBA-15. In order to confirm the potential application of the hybrids in gas sensing, investigations on the sensing properties toward the nerve agent simulant dimethyl methylphosphonate (DMMP) were carried out by QCM transducer. The QCM sensors based on hybrid materials exhibit excellent sensitivity toward trace DMMP vapour down to 26 ppb. In comparison with pristine SBA-15, the hybrids also show remarkably enhanced selectivity to DMMP due to suitable H-bonding interactions. Therefore, the well-defined mesoscopic porosity of the organic–inorganic hybrids together with the grafted fluoroalcohol and fluorinated-phenol derivatives lead to excellent sensing properties to DMMP vapour, and show great potential in the area of nerve agent detection.
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2020
·Vol. 41
·期 24
·2000120
·
IF 4.886
Chun-Xia Zhang,Hong-Wei Li,Yuqing Wu
A novel strategy is reported for the synthesis of glutathione (GSH)-protected bimetallic nanoclusters, Au-AgNCs@GSH, and its fabrication with polyvinyl alcohol (PVA) into a film sensor for H 2 S gas detection. Meanwhile, carbon dots (CDs) synthesized from polyethyleneimine (PEI) are introduced as an internal standard to correct the photobleaching of Au-AgNCs@GSH and uniformity of film. The joining of it greatly improves the chemical and structural stability of the composite film via multi cross-linking between PEI, PVA, and GSH. The PVA-AuAgNCs-CDs film exhibits an emission-quenching response to H 2 S gas at atmosphere, which is highly repeatable, fast, sensitive, and can distinguish H 2 S from other poisonous gases. Finally, the in-depth mechanism investigations reveal that the quenching response is attributed to decomposition of Au-AgNCs@GSH and the formation of Au 2 S and Ag 2 S in the composite film. As a sensor, the PVA-supported film combines the functions of fluorescent metal nanoclusters and polymer CDs, providing a portable device for the rapid detection of H 2 S gas in air.
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NANO
·
2016
·
IF 0.951
Yong Zhang,Long-Zhen Xie,Chao-Xin Yuan,Chun-Lin Zhang,Su Liu,Ying-Quan Peng,Hai-Rong Li,Miao Zhang
In this study, rose-like nickel oxide nanoparticles (diameter of 400–500 nm) were prepared on indium tin oxide (ITO) glass substrates by a simple electrodeposition in NiSO 4 ⋅ 6H 2 O solution. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscope (TEM) were used for analysis of the NiO nanoparticles. The effects of operating temperature on the sensor response and the response versus gas concentration properties of the NiO nanorose-based sensors were investigated. We determined the operating temperature of the gas sensors to be 230 ∘ C, considering the proper sensitivity and a rapid response. In addition, gas-sensing characteristics of rose-like NiO nanoparticles to formaldehyde were investigated. It was shown that the sensors exhibited good response ( R g / R a = 3 . 4 3 ) properties to formaldehyde gas at 230 ∘ C, making them to be promising candidates for practical detectors to formaldehyde gas.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Han Zheng,Zhonghang Xia,Huiming Ji,Yiwen Zhang
Mild UV in-situ assembly synthesizes GO@TiO 2 with Ti–O–C bonds. • Sensor exhibits a response of 25.93–50 ppm ethanol under UV at 25℃. • GO@TiO 2 response shows nonlinear growth with concentration. • Reaction-driven reconducted network boosts sensitivity, selectivity and stability. The development of the Internet of Things (IoT) has created an urgent need for room‑temperature gas sensors that combine high sensitivity, selectivity, and stability, which existing gas-sensing materials still struggle to deliver. Herein, the GO@TiO 2 composite is constructed via photocatalytic in situ assembly, wherein TiO 2 nanosheets are anchored onto graphene oxide (GO) with strong Ti–O–C covalent bonds formed at the interface. Under UV illumination at 25℃, the GO@TiO 2 sensor exhibits a response of 25.93 toward 50 ppm ethanol—a 14.4-fold enhancement over pristine TiO 2 (1.80)—along with excellent selectivity against various interfering gases. Moreover, the response exhibits a nonlinear surge with increasing gas concentration. The reaction-driven conductive network reconstruction mechanism is innovatively proposed: electrons generated from the ethanol oxidation reaction are injected into GO across the Ti–O–C interface, progressively restoring the conductive network and thereby switching the dominant conduction pathway from TiO 2 to the repaired GO. This work provides an innovative strategy for room-temperature gas sensing through the construction of the dynamically tunable conductive network to achieve signal amplification. Download: Download high-res image (221KB) Download: Download full-size image The GO@TiO 2 composite with covalent Ti–O–C bonds are designed for room-temperature ethanol sensing via photocatalytic in-situ assembly. Under UV illumination, the gas sensing reaction injects electrons into GO across the Ti–O–C bonds, driving reconstruction of the GO conductive network from a high‑resistance oxidized state to a conductive reduced state and leading to a sharp drop in resistance. This reaction‑driven network reconstruction triggers a superlinear response, endowing the sensor with high sensitivity (response of 25.93–50 ppm ethanol), selectivity, and stability.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Ning Ma,Jiancai Zhu,Heng Wang,Michael C. Qian,Zuobing Xiao
Aroma dramatically impacts the overall flavor profiles and consumer acceptance; therefore, it is necessary to conduct a comprehensive analysis of the aroma characteristics of apples. In this study, the aroma differences among four popular apple varieties (“Ruixue”, “Liangzhi”, “Crystal Fuji,” and “Guifei”) were compared using two extraction methods (headspace-solid phase microextraction, and solvent-assisted flavor evaporation) coupled with gas chromatography–mass spectrometry–olfactometry (GC–MS–O) and two-dimensional gas chromatography-quadrupole mass spectrometry (GC × GC-qMS). A total of 82 odorants were identified via GC–MS–O, and 143 volatiles were identified by GC× GC-qMS. Among them, 41 key aroma-active compounds (butanal, ethyl acetate, 3-methylbutanal, methyl butanoate, 2-methylpropyl acetate, ethyl 2-methylbutanoate, ethyl 3-methylbutanoate, butyl acetate, hexanal, 2-methylbutyl acetate, 1-butanol, 2-methylpropyl butanoate, 3-methylbutyl acetate, (E)-2-hexenal, butyl butanoate, butyl 2-methylbutanoate, hexyl acetate, hexyl butanoate, hexyl, 2-methylbutanoate, 1-octen-3-ol, 3-methylthiopropanol, 1,3-octanediol, linalyl acetate, and so on) with high odor activity values (OAVs) and AI value (odor activity values ≥1 or aroma intensity ≥3) were identified. Partial least-squares-discriminant analysis showed that Ruixue exhibited a high “fruity” note, Guifei and Crystal Fuji had the greatest “wood,” “floral,” and “sweet” notes, while Liangzhi presented a significant “green” note. This study provided flavor chemistry support for the apple quality control and production.
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产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2025
·
IF 5.1
Shenglong Wu,Lixiong Du,Yajing Wang,Kui Shen,Liyu Chen,Yingwei Li
The reverse water-gas shift (RWGS) reaction provides an important pathway for converting CO2 to CO, which can then be used to produce high-value chemicals through Fischer-Tropsch synthesis. Metal oxide materials, especially Fe2O3, offer considerable potential for use in RWGS reaction at high temperatures, but their catalytic performance is hindered by the inadequate activation and dissociation capabilities of H2 at low temperatures. Herein, we report the introduction of Fe4 with high H2 activation capability near Fe2O3, which shows a synergistic effect and achieves excellent activity and selectivity in RWGS reaction at low temperatures. Fe2O3 nanoparticles and Fe4 clusters supported on carbon (Fe2O3-Fe4/C) were prepared by KCl-assisted pyrolysis of NH2-MIL-88B(Fe) precursors. Fe2O3-Fe4/C delivers a remarkable CO selectivity of 99.4% and a space-time yield of 15.2 μmolCO gcat−1 s−1 at 350 °C and atmospheric pressure. In situ diffuse reflection infrared Fourier-transform spectra and density functional theory calculations demonstrate that the introduction of Fe4 clusters can activate H2 and significantly lower the reaction energy barrier of CO2 hydrogenation on Fe2O3 sites, thus boosting the RWGS performance at low temperatures.
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DOI
PubMed
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Xuyeke Chen,Xuefeng Shao,Yuxiang Zhang,Binrui Wang,Yanping Yuan
The flexible thermal energy storage using supercooled phase change materials (PCMs) allows thermal energy storage lasting flexible periods up to months and release when heat is on demand. As an essential part of latent heat retrieval, the crystallization triggering techniques were not fully investigated. The present work deals with the bubbling-triggered crystallization. Special attention is paid to the gas flow rate and bubble size effects. Xylitol, as a familiar polyalcohol, is screened as an energy storage medium with persistent supercooling. It is found that the estimated diameters of primitive and detached bubbles show an overall increasing trend with gas flow rate and gas tube size. Bubbling-triggered crystallization behavior is concerned with the bubbling conditions. A full crystallization probability was obtained with a 5 mm gas tube among the parallel tests. The crystallization temperature seems independent of gas flow rate. Both the minimum average crystallization durations and bubbling induction durations were obtained with a gas flow rate of 500 ml/min. However, the performance of bubbling agitation is not acceptable due to the long induction duration and apparent standard deviations. Under the guidance of the secondary nucleation mechanism, a coupled technique of bubbling with seeding was introduced to sufficiently trigger crystallization. The required induction duration is only 21 % of that with bubbling alone. The triggering performance was also improved, indicated by the raised crystallization temperature and accelerated crystallization rate. The experiment reproduction was greatly improved as well. The obtained results help to understand the bubbling-triggered crystallization of supercooled PCMs and to guide the gas injector design of a flexible thermal energy storage system.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Wanwan Wu,Linjie Song,Yinqi Qiao,Yan Bai,Xue Liu,Haiyan Li,Dongbin Dang
Developing efficient photocatalysts for the conversion of CO 2 into value-added chemicals is considered as an ideal strategy to handle the energy crisis and environmental pollution. Among the numerous candidate materials, lead-free perovskite Cs 3 Bi 2 Br 9 has attracted significant research interests in CO 2 photoreduction because of its excellent reducing power and controllable product selectivity. In this work, we developed a novel Cs 3 Bi 2 Br 9 /Ta 2 O 5 composite via the in-situ growth of Cs 3 Bi 2 Br 9 on the porous Ta 2 O 5 , which exhibits excellent dual functionalities of CO 2 capture and conversion. The optimized sample T2 achieved a CO photoreduction yield of 413.45 μmol g −1 h −1 without adding any sacrificial agents, which is 4.7 and 22.3 times higher than that of pure Cs 3 Bi 2 Br 9 and Ta 2 O 5 , respectively. The markedly improved photocatalytic performance arises from a type-II heterojunction charge transfer pathway generated between Cs 3 Bi 2 Br 9 and Ta 2 O 5 , which drives the highly efficient separation and transfer of charge carriers, as confirmed by the enhanced photocurrent response and quenched PL intensity. Furthermore, the achieved composite also exhibited remarkable stability, as evidenced by the well-maintained structural integrity of the material after a 24-hour cycling test. This study provides key insights for developing novel lead-free perovskite-based photocatalysts, which has significant scientific and application value for achieving carbon neutrality goals.
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JOURNAL OF POWER SOURCES
·
2026
·
IF 7.9
Minyue Yan,Xun Zhu,Dingding Ye,Xuefeng He,Yuan Zhou,Yang Yang,Qiang Liao
Air-breathing microfluidic fuel cells (AMFCs) are considered promising micro power sources due to their competitive cell performance, easy integration, and wide range of applications. However, the gas-liquid two-phase flow mechanism in AMFCs remains unclear. In this work, we propose a novel AMFC that enables high-resolution in-situ observation of the dynamic behavior of gas-liquid two-phase flow within the microchannel. A comprehensive analysis is conducted using mechanical models to investigate the cell performance and two-phase flow behaviors under various conditions, including wettability, flow rates, slant angles and the catalyst loading. Additionally, the influence mechanism of anodic pore size on bubble escape behavior is analyzed. We optimize cell power generation, discharge stability and two-phase flow under conditions of a hydrophilic channel, high flow rate and a 90° slant angle. For the porous anode, increasing the catalyst loading reduces the pore size of the anode surface, which is beneficial to promoting the detachment of small bubbles, thereby enhancing fuel transport, power generation and cell stability. This work provides the new insight into understanding the effects of gas-liquid two-phase flow on cell performance to improve the stability of power generation.
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ENERGY & FUELS
·
2017
·
IF 3.091
Pengrui Jin,Chuan Huang,Yadong Shen,Xinyuan Zhan,Xinyue Hu,Lei Wang,Liao Wang
The present work studied the simultaneous separation of H2S and CO2 from biogas by gas–liquid membrane contactor (GLMC) using single and mixed absorbents. The synthetic biogas contained 300 to 900 ppm of H2S, 30% to 50% CO2 and CH4. To better understand the effects of different absorbents on simultaneous separation of H2S and CO2 from biogas, water, monoethanolamine (MEA, primary amine), potassium carbonate (K2CO3, inorganic salt), potassium hydroxide (KOH, inorganic salt), and potassium sarcosine (PS, organic salt) were applied as absorbent solutions. Poly(vinylidene fluoride) (PVDF) hollow fiber membrane was used in the membrane contactor modules. The simultaneous absorption performance of CO2 and H2S into single and mixed absorbents was investigated. In addition, the effects of liquid and gas velocities, absorbent concentration, acid gas content of the feed gas, and gas pressure on the absorption performance and the analysis of mass transfer coefficients were investigated. The results indicated that the highest H2S absorption flux was obtained when KOH and K2CO3 were used as single absorbents, and the highest CO2 flux was obtained using PS as the single absorbent. The use of promoted K2CO3 with PS solutions could simultaneously improve the absorption flux of H2S and CO2. Increasing the liquid flow rate and absorbent concentration led to an increase in the CO2 absorption flux, while increasing the gas flow rate led to a significant increase in H2S absorption; The change of liquid flow rate has little effect on H2S absorption flux. A long-term stability test revealed that partial wetting of membrane could reduce the CO2 absorption flux but has little effect on H2S absorption flux. The detailed analysis of the mass transfer coefficients showed that liquid side resistance was negligible in comparison with membrane and gas side resistances for H2S absorption. On the contrary, the mass transfer process of CO2 was controlled by liquid mass transfer resistance.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2020
·
IF 3.905
Yanshuxian Liu,Yilei Fan,Zhongping Huang,Huijun Liu,Lili Wang,Zhenlu Shen,Ichi Watanabe
A novel method based on on-line pyrolytic methylation-gas chromatography/mass spectrometry was established and applied into rapid determination of γ-hydroxybutyric acid (GHB) in human hair. With the pyrolytic methylation by tetramethylammonium hydroxide (TMAH), GHB was converted into its corresponding methyl ester in the pyrolyzer at 500 °C. Thus, GHB in hair samples could be well determined by GC/MS on a capillary column in SIM mode. To obtain optimum methylation conditions, important factors were investigated and then applied to the following experiments. The results were obtained as following: 500 °C as reaction temperature, 2:1 as the proportion of TMAH to GHB. The achieved calibration curve exhibited good linearity with the correlation coefficient of 0.9997 at the concentraion range of 2−200 ng/mg, and relative standard deviation (n = 3) from 1.3 %–7.7 %. The limit of detection and the limit of quantification were down to 0.3 ng/mg and 1.0 ng/mg, respectively. The precision ranged from 2.0 %–7.9 % and the recovery ranged from 98.5 %–107.4 %. The results of on-line pyrolytic methylation-GC/MS were in agreement with those observed by the referenced off-line silylation-GC/MS method. The method was applied to a real case of a woman addicted to GHB, the drug concentration in hair segments of 0−5 cm and 5−10 cm from the root strand well correlated with the use of GHB in different periods of her life. The proposed method demonstrated significant potential in the application of rapid determination for GHB in human hair.
研究领域:
法医毒理学
·
药物代谢
·
分析化学
·
生物样本分析
·
临床化学
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