SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Renjun Si,Hongze Jiang,Jinbo Yang,Renminxi Ou,Shaofeng Chen,Xin Guo,Shunping Zhang
Aiming to address the bottleneck issues of database complexity and signal drift in electronic nose systems, this study proposes a novel supplementary strategy for multi-component gas detection. The MEMS gas sensor developed here, based on temperature-programmed desorption (TPD), enables the extraction of multiple volatile target compounds in Baijiu (Chinese distilled spirits) through an adsorption process. Subsequently, the TPD spectrum is employed to derive characteristic signals of these target substances for identification. By incorporating this sensor into a Baijiu detection system and combining it with pattern recognition algorithms, accurate classification of aroma profiles has been successfully achieved for both known and unknown Baijiu samples across different brands. This multi-component gas detection method not only offers an effective complement to electronic nose technology but also provides valuable insights for improving the selectivity of metal oxide semiconductor (MOS) gas sensors.
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产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xin-Yue Wang,Yi-Ming Gu,Xu-Peng Zong,Sheng-Sheng Zhao,Shu-Dong Wang
The inevitable combustion of fossil fuels in human industrial activities results in significant greenhouse gas emissions, leading to the pressing challenge of CO 2 /N 2 separation in humid flue gas. Iron-based Metal-organic frameworks (MOFs) have proven to be cheap, robust against water vapor attack due to the enhanced coordination bonds. In this study, we present two distinct MOFs i.e., DNL-9(Fe) and PCN-233(FeM II ), constructed by Fe clusters and 2,5-furandicarboxylic acid ligands. Static adsorption experiments revealed that DNL-9(Fe), featuring an exclusive Fe-F-Fe spiral packing structure, exhibited higher surface areas and enhanced CO 2 adsorption performance that outcompeted PCN-233 candidates. DNL-9(Fe) demonstrated a high IAST selectivity of CO 2 /N 2 at 247 (15/85, v/v, P/P 0 = 0.01), superior to the most of state-of-the-art Fe-MOFs reported up to date. The further theoretical calculations elucidated the binding sites of the framework with CO 2 molecules. Importantly, DNL-9(Fe) showed sufficient water stability and cyclic separation, as confirmed by dynamic breakthrough tests, indicating it as a promising candidate for practical CO 2 capture from humid flue gas.
研究领域:
化学
·
材料科学
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环境科学
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DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Jiaxu Li,Songlin Wang,Lei Lai,Pingwei Liu,Haiqiang Wu,Jinlong Xu,Steven J. Severtson,Wen-Jun Wang
There is currently great interest in biodegradable alternatives for packaging and agricultural applications. The most viable biodegradable alternative, poly (butylene adipate-co-terephthalate) (PBAT), has poor resistance to water vapor and oxygen permeation and tends to degrade rapidly under solar exposure. Herein, we report a preparation of PBAT nanocomposite films with aligned graphene nanosheets both in and on the films by combining two techniques, biaxial orientation and rod scarping. The composite films with a graphene content of 0.48 vol% exhibited 80% decrease of water vapor permeability and over 99% decrease of oxygen permeability , approaching values of 1.0 × 10 −11 g m m −2 ·Pa −1 s −1 and 6.2 × 10 −16 cm 3 cm cm −2 ·Pa −1 s −1 . These values are respectively comparable to and even lower than the reported 9.9 × 10 −12 g m m −2 ·Pa −1 s −1 and 8.0 × 10 −15 cm 3 cm cm −2 ·Pa −1 s −1 for polyethylene films. After a 200 h aging, the composite films still possessed a fracture strength of 47.3 MPa and an elongation at break of 167%, in contrast to a complete fragmentation of pure PBAT. We believe that the controlled incorporation of aligned graphene nanosheets to biodegradable polymers could become an important strategy to develop sustainable packaging and agricultural films.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ACS ES&T Engineering
·
2024
·
IF 7.4
Hanling Jiang,Jingwen Wang,Aijuan Zhou,Yong Liu
Advanced oxidation processes (AOPs) for removing ammonia nitrogen (NH4+-N) are of increasing interest in wastewater treatment. In this paper, the UV-activated persulfate (PS) process with CaO was applied to oxidize NH4+-N to nitrogen gas (N2). Nearly all of the NH4+-N (30 mg N/L) could be removed within 15 min, and the N2 selectivity was achieved at 95.0%. The addition of CaO made NH4+-N exist in the form of NH3, and HO• was the critical reactive species for NH4+-N oxidation. NO, N2H4, and NO2– were identified as oxidation intermediates and could be further removed. The reaction between N2H4 and NO2– with the assistance of UV/CaO promoted N2 generation during NH4+-N oxidation. The increased dosages of CaO (0.2 to 4.0 g/L) and PS (0.6 to 2.4 g/L) could enhance the NH4+-N oxidation, while the presence of CO32– (100 mM) significantly retarded the removal of NH4+-N. As high removal of NH4+-N (100%) and high N2 selectivity (>79.5%) could be achieved in lake water and secondary wastewater, the proposed UV/PS/CaO process could be potentially applied for the oxidation of NH4+-N in practical water treatment.
研究领域:
环境科学
·
废水处理
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DOI
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 13
·4895-4900
·
IF 1.938
Jianqiao Xu,Shuming He,Ruifen Jiang,Fang Zhu,Jingwen Ruan,Hong Liu,Tiangang Luan,Gangfeng Ouyang
Recent developments of solid-phase microextraction (SPME) in biological and environmental analysis calls for robust and low-cost fibers that are prone to batch preparation with good reproducibility. However, the expensive commercial fibers and low reproducible home-made fibers cannot fully cater these requirements. In the present study, an extremely low-cost (less than one dollar) SPME fiber with good intra-fiber (RSDs% ≤ 1.6%, n = 6) and inter-fiber reproducibility (RSDs% ≤ 6.2%, n = 6) was prepared by mounting a piece of commercially available polydimethylsiloxane (PDMS) tubing on a stainless steel wire with epoxy glue. This configuration was stable for more than 100 extraction/thermal desorption cycles. In addition, compared with previously used thicker PDMS fiber, the capability of direct thermal desorption in gas chromatograph of the present fiber not only simplified the sample preparation process but also enhanced the analysis sensitivity. Excellent inter-fiber reproducibility and low cost even made the fiber disposable when used in complex matrices.
研究领域:
分析化学
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环境科学
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生物分析
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DOI
高影响因子
Atmosphere
·
2019
·Vol. 10
·期 2
·88
·
IF 2.046
Rui Li,Xiaotong Jiang,Xinfeng Wang,Tianshu Chen,Lin Du,Likun Xue,Xinhui Bi,Mingjin Tang,Wenxing Wang
Semivolatile organic nitrates (SVONs) contribute a large proportion of total organic nitrates and play an important role in the tropospheric chemistry. However, the composition and concentrations of SVONs in the atmosphere remain unclear due to the lack of reliable analytical techniques for specific organic nitrates. In this study, a method based on gas chromatography and electron ionization–mass spectrometry was developed to detect ambient SVONs that were collected via polyurethane foam disk enrichment. Three SVONs were identified in the semivolatile samples from urban Jinan during spring based on the characteristic fragment ions of [NO2]+and [CH2NO3]+and the characteristic fragment loss of NO2and NO3: 1-pentyl nitrate (molecular weight [MW] = 133), 4-hydroxy-isoprene nitrate (MW = 147), and (3,4)-di-hydroxy-isoprene nitrate (MW = 163). The latter two isoprene nitrates were rarely detected in the real atmosphere in previous studies. The contents of 1-pentyl nitrate, 4-hydroxy-isoprene nitrate, and (3,4)-di-hydroxy-isoprene nitrate were roughly quantified based on the standard of 1-pentyl nitrate, with a detection limit of 50 μg L−1. In addition, Fourier transform infrared spectrometry was used to determine the total SVONs content. The average concentrations of 1-pentyl nitrate, 4-hydroxy-isoprene nitrate, (3,4)-di-hydroxy-isoprene nitrate, and total SVONs in Jinan during spring were 20.2 ± 7.2, 13.2 ± 7.2, 36.5 ± 8.4, and 380.0 ± 190.8 ng m−3, respectively. The three identified SVONs contributed only 20.2 ± 5.5% to the total SVONs, which suggests that some unidentified SVONs are present in the ambient atmosphere and that studies with improved or advanced analytical techniques will be required to identify them.Keywords:organic nitrates;semivolatile sample;GC/EI-MS;identification;semiquantification
研究领域:
大气科学
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分析化学
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DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Jirui Zou,Xiang'an Yue,Weiqing An,Lijuan Zhang
In this paper, the gas–liquid static contact angles in silica microtubes (inner diameter range of 5–700 μm) are measured by optical microscope. The experimental results show that the gas–liquid contact angles in the microtube have microscale wetting effect, which decrease monotonically with the decrease of the tube diameter and regularly deviate from the contact angle measured on the plate. When the tube diameter decreases from 700 μm to 5 μm, the contact angles of water and hexadecane decrease from 42.87° to 13.22° and 15.94°–9.09°, respectively. Actual microscale wetting effect causes the gas–liquid capillary force and driving resistance of residual droplets in pore-throat to be bigger than the value determined by the contact angle on the plate. The smaller the pore radius, the greater the influence of the microscale wetting effect on the capillary force. The larger pore-throat ratio and smaller throat radius, the greater influence of the microscale wetting effect on the driving resistance. These results advance our current understanding of wettability in porous media and offer us directly measured contact angles from pore scale which are better representation of actual pores than flat plate to characterize the fluid wettability in porous media.
研究领域:
材料科学
·
流体力学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hao Chen,Chaofang Li,Jing Yuan,Ding Bao,Fenghua Shen,Pingshan Wang,Xingzheng Dai,Zhanqing Lu,Kaisong Xiang,Hui Liu
The application of Fe-based ionic liquids (ILs) in elemental mercury (Hg 0 ) removal from flue gas is limited by the low oxidative activity of the Fe(III) center. Here, a strategy of engineering halogen ligand to enhance the oxidative activity of Fe-based ILs for mercury removal was proposed. We developed a series of ionic liquids [Bmim][FeCl 4-x Br x ] (x = 0–4) with varying ratios of Cl − and Br − ligand substitutions. Mercury removal performance evaluations demonstrated a positive correlation between the oxidative activity towards Hg 0 and the number of Br ligand substitutions in the ILs. [Bmim][FeBr 4 ] achieved ∼99 % removal efficiency in the temperature range of 50–150 °C, with a saturated adsorption capacity reaching 205.4 mg/g (at 150 °C). In-situ Raman spectroscopy, DFT calculations, Hg-TPD, and XPS collectively revealed that the introduction of Br significantly lowered the excitation energy of the ligand–metal p-d orbital electron transitions, which facilitates the generation of active bromine species with unfilled 4p orbital, consequently enhancing the oxidative removal performance of Fe-based ILs for Hg 0 . This work provides an application of metal-based ILs in the realm of mercury removal and broadens the scope of ligand–metal interaction for IL design.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 7
·4666-4676
·
IF 3.553
Wang Pan,Tian Xuemin,Yan Meng,Yang Boxuan,Hua Zhongqiu
In this study, a catalytic-type combustible gas sensor was fabricated by the screen-printing method. Pt supported catalysts (Pt-HZSM5) were prepared by a wet impregnation method using HZSM5 zeolite as support. It was found that Pt-HZSM5 catalysts have a highly catalytic activity to H 2 and CO at low temperatures and a selectively and fully combustible was observed at only 150 °C. A good dispersion state of Pt nanoparticles on HZSM5 zeolite particles was beneficial for the catalytic oxidization of CO and H 2 . However, a high loading amounts lead to a poor dispersion state and a weak catalytic activity. The thick film sensor based on Pt-HZSM5 catalyst was found to be highly sensitive to combustible gas with a good linearity up to 2% and a limitation of detection (LOD) around 50 ppm. Due to the low operation temperature, a highly selectivity was obtained for CO and H 2 and no cross-sensitivity to interfering gases such as CH 4 and VOCs. It was indicated that the present developed catalytic-type gas sensors could be used for the leakage detection and monitor for H 2 and CO with a low power consumption and a good selectivity.
研究领域:
材料科学
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化学工程
·
传感器技术
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DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Zhou Liang,Yang Zhiyong,Wei Deju,Zhang Heng,Lu Wei
A series of composite catalysts with different Fe-based load amounts were prepared and applied to the experiment of biomass gasification assisted by steam. The structure of the catalyst was analyzed by XRD, SEM, TEM, N2 adsorption-desorption, and H2-TPR. The effect of the change of Fe load amounts on the catalytic activity was studied, and the optimal conditions of the gasification reaction were selected. The relationship between catalyst structure and catalytic capacity was clarified. The results showed that under the optimal reaction conditions, the catalyst showed better catalytic activity when Fe load amounts were 10%. The proportion of hydrogen in the gasification gas is as high as 42.2% and the hydrogen production is 27.65 g/kg. The tar content reaches the lowest value of 34.07g/Nm3.
研究领域:
能源科学
·
催化化学
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Zhuang Liu,Dachao Ma,Liwu Liang,Xuan Hu,Mengxue Ling,Zhou Zhou,Lizhong Fu,Zheng Liu,Qingge Feng
Hydrothermal treatment (HTT) of polyvinyl chloride (PVC) can efficiently remove chlorine (Cl) to produce low Cl hydrochar for solid fuel. This work performed co-hydrothermal treatment of PVC recycled plastics (PVC R ) with biomass, then tried to reveal the combustion behavior and Cl migration behavior during combustion of PVC-derived hydrochar . It is shown that the hydrothermal temperature was the dominant factor affecting the degradation and dechlorination of PVC R . Treated at 220 ℃ for 60 min, the dechlorination efficiency of PVC R was 4.88 wt% and it was significantly increased to 34.09 wt%, 28.60 wt% and 32.50 wt% when PVC R was co-treated with bagasse, bagasse + high impact polystyrene (HIPS) and bagasse + acrylonitrile butadiene styrene (ABS), respectively. The substitution of Cl by hydroxyl (-OH) and elimination were two main dechlorination pathways. Bagasse could provide abundant -OH so as to promote the dechlorination of PVC R . Interestingly, in the combustion of PVC R and hydrochars, the Cl was mainly released in the form of HCl at lower temperature combustion stage but C-Cl mostly emitted at higher temperature combustion stage . The emitted Cl species strongly depends on the Cl content in hydrochar and combustion temperature , but did not show relevance to the existence form of Cl in hydrochar. Hydrothermal dechlorination could sharply reduce HCl emission.
研究领域:
环境科学
·
能源工程
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DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 3
·719
·
IF 3.426
Zhiqiang Tan,Huimin Su,Yiwen Guo,Huan Liu,Bo Liao,Abid Muhammad Amin,Qingquan Liu
Conjugated microporous polymers (CMPs) have conjugated skeleton and permanent porosity, and exhibit huge potential in developing novel functional materials for resolving the challenging energy and environment issues. Metal-containing CMPs often exhibited unique properties. In the present manuscript, ferrocene-based conjugated microporous polymers (FcCMPs) were designed and synthesized with 1,1′-dibromoferrocene and 5,10,15,20-Tetrakis(4- bromophenyl) porphyrin (FcCMP-1) or Tetra (p-bromophenyl) methane (FcCMP-2) as building units via Yamamoto coupling. FcCMPs were amorphous, and exhibited excellent thermal and physicochemical stability. The BET surface area of FcCMP-1 and FcCMP-2 was 638 m2/g and 422 m2/g, respectively. In comparison with FcCMP-2, FcCMP-1 displayed better gas storage capacity due to higher porosity. FcCMPs were also used as an adsorbent for removal of methyl violet from aqueous solution, and exhibited excellent adsorption properties due to the interaction between electron-rich conjugated structure of the polymers and methyl violet with cationic groups. Moreover, FcCMPs could be extracted and regenerated by an eluent and then re-used for high efficient removal of methyl violet.Keywords:conjugated microporous polymers (CMPs);ferrocene;gas adsorption;dye removal
研究领域:
材料科学
·
环境科学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）