ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 47
·71721-71730
·
IF 5.19
Huang Wenjun,Li Sichao,Wang Hongbin,Cui Peng,Xu Haomiao,Cheng Can,Qu Zan,Yan Naiqiang
Oxidation–reduction-absorption based on sulfite is a promising process for simultaneous removal of NO x and SO 2 . However, excessive oxidation of sulfite and competitive absorption between NO x and SO 2 limit its application. A matching strategy between antioxidants and alkaline agents has been proposed to solve these problems and enhance the absorption process. The comparison results of inhibitors showed that hydroquinone exhibited long-term high-efficiency inhibition of S(IV) (SO 3 2- /HSO 3 - ) oxidation. The comparison of alkaline agents showed that the Na 2 SO 3 solution with heterogeneous mixture of MgO and hydroquinone exhibited better absorption performance than that with other combinations. The absorption amounts of NO x in 0.15 mol/L Na 2 SO 3 50 mL solution added 0.1% hydroquinone (HQ) with 0.09 mol/L MgO were 2.24 mmol, which improved 5 times than that without additives. In addition, studies on the influence of pH showed that the pH of MgO mixture could be stabilized at 9–10 for a long time, while the pH of Na 2 CO 3 mixture decreased faster. Further studies suggested that the hydration of MgO resulted in the solution with MgO keeping high pH. This is also the main reason why the combination of MgO and hydroquinone is superior to the combination of Na 2 CO 3 and hydroquinone in desulfurization and denitration performance.
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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Yiwen Wang,Yang Liu,Qiu Han,Haibo Lin,Fu Liu
Extracorporeal membrane oxygenation is a technique that provides short-term supports to the heart and lungs. It removes CO 2 from the blood and provides enough oxygen, which is a huge help in the fight against COVID-19. As the key component, the artificial lung membranes have evolved in three generations including silicon, polypropylene and poly (4-methyl-1-pentene). Herein, we for the first time design and fabricate a novel poly (4-methyl-1-pentene)/polypropylene (PMP/PP) thin film composite (TFC) membrane with the anticoagulant coating composed of poly (sodium 4-styrenesulfonate) and cross-linked poly (vinyl alcohol). Poly (sodium 4-styrenesulfonate) provides sulfonic acid groups to inhibit the coagulant factors (FVIII and FXII), and cross-linked poly (vinyl alcohol) increase the stability of the anticoagulant coating and further improve the hydrophilicity via abundant hydroxyl groups to depress the protein adsorption. Long-term anticoagulant property was demonstrated by whole human blood for 28 days. Blood compatibility was evaluated by hemolysis rate, anticoagulation activity (APTT, TT and PT), complement activation, platelet activation and contact activation. Pure CO 2 , O 2 and N 2 permeation rates were determined to evaluate the mass transfer properties of PMP/PP TFC membranes. Gas permeation results revealed that gas permeation flux increased in the TFC membranes because of the decrease of crystallinity. Overall, the so prepared PMP/PP membrane shows good CO 2 /O 2 selectivity and blood compatibility as novel TFC artificial lung membrane.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xuezheng Guo,Yijie Shi,Peilin Liu,Yanqiao Ding,Bingsheng Du,Chengyao Liang,Wen Niu,Yiling Tan,Yuhui He,Jiangzhao Chen,Xiangshui Miao,Xi Yang,Yong He
Explosives can be analyzed for their content by detecting the photolytic gaseous byproducts. However, to prevent electrostatic sparking, explosives are frequently preserved in conditions with low temperatures and high humidity, impeding the performance of gas detection. Thus, it has become a research priority to develop gas sensors that operate at ambient temperature and high humidity levels in the realm of explosive breakdown gas-phase detection. In this work, 3-aminopropyltriethoxysilane (APTES) self-assembled monolayer-functionalized tin diselenide (APTES-SnSe2) nanosheets were synthesized via a facile solution stirring strategy, resulting in a room-temperature NO2 sensor with improved sensitivity and humidity tolerance. The APTES-SnSe2 sensor with moderate functionalization time outperforms the pure SnSe2 sensor in terms of the response value (317.51 vs 110.98%) and response deviation (3.11 vs 24.13%) under humidity interference to 500 ppb NO2. According to density functional theory simulations, the stronger adsorption of terminal amino groups of the APTES molecules to NO2 molecules and stable adsorption energy in the presence of H2O are the causes of the improved sensing capabilities. Practically, the APTES-SnSe2 sensor achieves accurate detection of photolysis gases from trace nitro explosives octogen, pentaerythritol tetranitrate, and trinitrotoluene at room temperature and various humidity levels. This study provides a potential strategy for the construction of gas sensors with high responsiveness and antihumidity capabilities to identify explosive content in harsh environments.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Sanbao Dong,Jiabao Fan,Chenwei Liu,Yongli Yan,Weiwei Han
Liquid buildup in gas wells would undoubtedly obstruct the gas production. The use of foaming surfactants to generate foams and remove the loaded liquid is very common. Due to the undesirable conditions (e.g., high condensate cut (ratio of condensate oil volume to total liquid volume) and high salinity, etc.) that often encountered in the wells, different foaming surfactants were often compounded together to unload liquid in gas wells. In this paper, lauramide propyl dimethylamine (C12 Amine), palmitamide propyl dimethylamine (C16 Amine) and cocamidopropyl betaine (CAPB) were synthesized and compounded with L-aspartic acid (Asp) and N-lauroylsarcosine sodium (LSS) to form foaming supramolecular complexes through optimization (with Waring blender method and liquid unloading tests) to quantify their application potentials in foam-based deliquification treatment for gas wells. The C12 Amine-Asp-LSS-CAPB complex (in an optimized mole ratio of 10:4:14:7) exhibited superior condensate tolerance than the C16 Amine-Asp-LSS-CAPB complex (in an optimized mole ratio of 10:4:14:42). The salinity posed a significant influence on the liquid unloading performance ( k ) and foaming efficiency ( ƞ , defined as the ratio of the foam mass to the initial liquid mass) of the C12 Amine-Asp-LSS-CAPB complex, however, the nitrilotriacetic acid trisodium (NTA) can greatly enhance the properties of the C12 Amine-Asp-LSS-CAPB complex against the salinity (up to 6 × 10 4 mg/L). The temperature (25 °C −90 °C) favored the performances (as indicated by k and ƞ ) of the C12 Amine-Asp-LSS-CAPB complex, which achieved k and ƞ values of 85.0% and 100% at 90 °C, respectively. Meanwhile, the synergy observed in the foaming ability, foam stability and liquid unloading performance tests using the C12 Amine-Asp-LSS-CAPB mixture was also proved by the surface tension analysis and the calculations of the supramolecular interactions (interaction energies and electrostatic interactions).
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Yuan Yang,Yao Lin,Jiahui Yang,Yubin Su,Yuanyuan Li,Yurong Deng,Chengbin Zheng
The determination of volatile methylsiloxanes (VMSs) in municipal sewage has attracted great attention. Gas chromatography-mass spectrometry (GC-MS) is the most mature detection technique for VMSs, however, its instrumentation and operation cost are unfavorable in low- and middle-income countries. Herein, a novel and cost-effective strategy by using a 3D printed miniature microplasma optical emission detector ( μ AED) as an alternative to MS detector, was developed to detect VMSs in municipal sewage by GC after preconcentration by a laboratory-built automatic purge and trap (P&T) system. Two types of μ AED s have been fabricated and their analytical performances were compared. The one using two tungsten rods as electrodes shows better performance and was thus selected as the detecting system for real sample analysis. Under the optimized conditions, the P&T-GC- μ AED system provided limits of detection of 3.6 ng L −1 to 15.5 ng L −1 of Si for tested VMSs. Relative standard deviations were better than 3.0% and good recoveries ranging from 82.4% to 102.8% were obtained for all analytes. The applicability of this system was demonstrated via the measurement of VMSs in the influents and effluents from 10 wastewater treatment plants (WWTPs) in Chengdu, China.
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Food Analytical Methods
·
2026
·Vol. 19
·期 11
·350
·
IF 3
Li Yunna,Li Xueliang,Chang Yuming,Qi Fan,An Lingxia,Jiang Kezhi
The content of free fatty acids (FAs) is a critical safety indicator for edible oils. However, the current GC–MS analysis of FAs is not satisfactory due to their inefficient derivatization under mild conditions. In this study, we achieved efficient methylation of fatty acids within 10 min by derivatization with trimethylsilyldiazomethane (TMSD) catalyzed trimethyl chlorosilane (TMSC). Then, an efficient methylation of FAs was achieved within 10 min through derivatization with trimethylsilyldiazomethane under the catalysis of trimethylchlorosilane, and a convenient method for the determination of 33 free fatty acids in oil samples has been developed by methylation in combination with extraction with methanol and GC–MS analysis. The method exhibited good reproducibility, sensitivity, and recovery. The determined content range of several free FAs (e.g. palmitoleic acid, α-linolenic acid, linoleic acid, elaidic acid, and arachidic acid) in edible oils was significantly lower than that in expired edible oils (or gutter oil). Furthermore, the content of γ-linolenic acid, which is prone to oxidation, was below the LOQ (0.40 ng/g) in gutter oil, suggesting it as an indicator of severe oxidative degradation. This method was characterized by its ease of operation and good reproducibility, presenting significant potential for oil quality control.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 10
·1-11
·
IF 5.7
Fu Quanbin,Li Jingkun,Wang Xin,Sun-Waterhouse Dongxiao,Sun Xin,Waterhouse Geoffrey I. N.,Wu Peng
Covalent organic framework-coated magnetite particles (Fe 3 O 4 @COF) were synthesized and applied as the adsorbent to the selective capture of phthalate esters (PAEs) in liquid foods. Combined with the magnetic solid-phase extraction (MSPE) technology, a gas chromatography-tandem mass spectrometry (GC–MS/MS) method was employed for the separation and quantification of PAEs. Following optimization of the magnetic extraction and elution parameters, the developed analytical method offered a satisfactory linear range (0.1–5 μg L −1 ) with determination coefficients ranging from 0.9934 to 0.9975 for the five different PAEs studied. The limits of detection (LOD) were in the range 1.9–12.8 ng L −1 . The recoveries ranged from 70.0 to 119.8% with a relative standard deviation (RSD) less than 9.7%. Density functional theory (DFT) calculations established that the dominant adsorption mechanism used by the COF to bind PAEs involved π-π stacking interactions. Results encourage the wider use of COF-based adsorbents and MSPE methods in the analytical determination of PAEs in foods. Graphical Abstract
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Food Analytical Methods
·
2020
·Vol. 14
·期 3
·616-630
·
IF 2.667
Qi Dandan,Ma Chengying,Wang Wenwen,Zhang Licui,Li Jianke
Royal jelly produced by nurse bees from tea tree (tea royal jelly) is a special bee product in China and it is popular with consumers owing to its multiple healthcare functions. However, the volatile compound profile of tea royal jelly has not been investigated. To obtain a comprehensive understanding of volatile compound profile of tea royal jelly, a method based on headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry (HS-SPME/GC-MS) and chemometric analysis was applied. Moreover, two royal jelly samples produced from pagoda tree were also investigated to reveal the difference in volatile compounds between royal jelly produced from tea tree and other plants. A total of 66 volatile compounds were identified in tea royal jelly, including 16 alkanes, 14 aldehydes, 9 alcohols, 9 ketones, 8 esters and lactones, 5 phenols, 2 organic acids, and 3 other compounds, and most of them were discovered in royal jelly for the first time. Notably, α -ionone, an important aroma compound in tea, was first identified in tea royal jelly. Moreover, the result of chemometric analysis indicates a significant difference on volatile compound profile between royal jelly produced from tea and pagoda trees. To sum up, 35 differential compounds were identified and they could well distinguish royal jelly samples. Our data offers the first characterization of volatile compound profile of tea royal jelly and significantly expands the knowledge of volatile compounds in royal jelly. It is potentially useful as a new approach to distinguish royal jelly produced from different botanical origins.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Minxuan Huang,Shaopeng Wang,Hao Fu,Hongyun Shao,Yinghui Wang,Kefu Yu,Yilin Huang,Zhiping Jv,Liwei Wang
For widely used semiconductor-based chemoresistive sensors, low sensitivity and poor anti-interference in the complex environment (humidity resistance, etc. ) are two main constraints of application. To enhance the sensitivity, many effective strategies have been developed such as constructing heterostructures with synergistic effects, introducing abundant oxygen vacancies as active sites, designing hollow/cavity structure to increase surface area to facilitate target gas adsorption, and so on. Besides, the interference caused by water vapor can be blocked. via MOF or molecular sieve membranes but is accompanied with the shielding of some target molecules. The above methods are faced with the problems of complex process, large workload of material screening and failure to maintain the device stability. Hence, an effective vapor-phase method derived N-C@SnO 2 -Co 3 O 4 complex that combined the hydrophobicity , acetone selectivity, p-n heterostructure with mesoporous hollow characteristics was proposed, named mesoporous N-C@SnO 2 -Co 3 O 4 hollow nanoboxes (HNBs). Particularly, the chemoresistive sensor based on N-C@SnO 2 -Co 3 O 4 HNBs (2.0%) showed satisfactory selectivity to acetone vapor at relatively low working temperature (160 °C), and the response remained stable even under high humidity (with the R.H. of 90%). Impressively, a three-fold enhancement in response signal was observed for the sensor based on N-C@SnO 2 -Co 3 O 4 HNBs when compared with its counterpart of SnO 2 -Co 3 O 4 , which can be ascribed to the consequent unpaired electrons from oxygen vacancies and hollow mesoporous structures. Additionally, a sensing prototype based on the N-C@SnO 2 -Co 3 O 4 HNBs was practically fabricated. The satisfactory sensing response and stability further verified the potential applications in industrial acetone detection. This facile vapor-phase approach sheds light on designing sensing materials with enhanced sensitivity and humidity resistance, as well as device stability simultaneously.
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MOLECULES
·
2020
·Vol. 25
·期 2
·380
·
IF 3.267
Shuyan Wang,Feng Zhao,Wenxi Wu,Pengjie Wang,Naixing Ye
Chinese jasmine tea is a type of flower-scented tea, which is produced by mixing green tea with theJasminum sambacflower repeatedly. Both the total amount and composition of volatiles absorbed from theJasminum sambacflower are mostly responsible for its sensory quality grade. This study aims to compare volatile organic compound (VOC) differences in authoritative jasmine tea grade samples. Automatic thermal desorption-gas-chromatography-mass spectrometry (ATD-GC-MS) and electronic nose (E-nose), followed by multivariate data analysis is conducted. Consequently, specific VOCs with a positive or negative correlation to the grades are screened out. Partial least squares-discriminant analysis (PLS-DA) and hierarchical cluster analysis (HCA) show a satisfactory discriminant effect on rank. It is intriguing to find that the E-nose is good at distinguishing the grade difference caused by VOC concentrations but is deficient in identifying essential aromas that attribute to the unique characteristics of excellent grade jasmine tea.Keywords:Chinese jasmine tea;tea grade;volatile organic compounds;electronic nose (E-nose);automatic thermal desorption-gas-chromatography- mass spectrometry (ATD-GC-MS);multivariate statistical analysis
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Foods
·
2019
·Vol. 8
·期 6
·205
·
IF 3.011
Wei Zhang,Xianrui Liang
In this study, natural deep eutectic solvents (NADESs) were used as both the extraction and dilution matrix in static headspace gas chromatography-mass spectrometry (SHS-GC-MS) for the analysis of volatile components inIpomoea cairica(L).Sweet(ICS) leaves. Six NADESs were prepared and the NADESs composed of choline chloride and glucose with a 1:1 molar ratio containing 15% water were preferred due to the better peak responses. A total of 77 volatiles inICSleaves were detected and tentatively identified by mass spectral matching with the US National Institute of Standards and Technology (NIST, 2014) Mass Spectral Library and the retention index-assisted qualitative method. These 77 volatile components were mainly terpenoids, aromatics, and aliphatics. Among them, β-elemene, β-caryophyllene, α-humulene, and 2, 4-di-tert-butylphenol were found to be the main components. This investigation verified that the use of NADESs is an efficient green extraction and dilution matrix of the SHS-GC-MS method for direct volatile component analysis of plant materials without extra extraction work.Keywords:Ipomoea cairica(L.)Sweetleaves;natural deep eutectic solvents;static headspace gas chromatography-mass spectrometry;volatile components
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Fangbo Xia,Ruibing Feng,Feng-Guo Xu,Huanxing Su,Chengwei He,Yuan-Jia Hu,Jian-Bo Wan
Phospholipid fatty acids play the crucial role in biophysical properties and the function of cellular membranes. In the present study, an accurate and sensitive method was developed to quantify phospholipid fatty acids in biological samples by using chemical isotope labeling coupled with atmospheric pressure gas chromatography quadrupole-time-of-flight mass spectrometry (APGC/Q-TOF MS). APGC, a soft ionization source, was operated under proton-transfer condition by introducing methanol into the ionization source as a modifier, which provided high quantifiable molecular ion peaks to substantially enhance the sensitivity. Fatty acid standards were methylated with methanol- d 4 to yield FAMEs- d 3 that were used as one-to-one internal standards to ensure accurate quantification. Thirty fatty acids in phospholipids were accurately quantified in wide linear range with limit of quantification ranging from 84.6 to 113.2 pg/mL. The newly developed method was successfully applied to quantify phospholipid fatty acids in brain and liver tissues from both fat-1 and WT mice. This method might be expanded to quantify free fatty acids or other conjugated fatty acids in biological samples or other matrices.
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危险品化学品经营许可证（带存储）