RSC Advances
·
2017
·Vol. 7
·期 72
·45408-45415
·
IF 3.108
Jianlin Peng,Tao Sun,Lianqian Wu,Meiling Qi,Xuebin Huang
This work explored the separation performance of two new dithienyl benzothiadiazole (TBT)-based materials, namely 4,7-di(5-allyl-2-thienyl)benzothiadiazole (TBT-AA) and 4-(5-allyl-2-thienyl)-7-(5-dodecyl-2-thienyl)benzothiadiazole (TBT-AC12), as the stationary phases for capillary gas chromatography (GC). The TBT-AA and TBT-AC12 columns exhibited medium polarity and achieved a column efficiency of 3700 plates per m and 3800 plates per m, respectively, by n-dodecane under 100 °C. They showed high-resolution performance for analytes of different varieties and advantageous resolving capability for positional and structural isomers, such as chloronitrobenzenes, dibromobenzenes, cymenes and hexanes, over the polysiloxane stationary phase with similar polarity. Moreover, the TBT-based stationary phases display different retention behaviours from the conventional phase via diversified molecular interactions covering π–π and π–π EDA, halogen-bonding, H-bonding interactions and van der Waals forces. Also, they exhibited good column repeatability with the relative standard deviation (RSD) values of less than 0.12% for run-to-run, 1.8% for day-to-day and 5.0% for column-to-column, respectively. This work demonstrates the good potential of the TBT-based stationary phases for GC separations.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 4
·2105-2112
·
IF 12.732
Tian Hou,Meng Zhang,Wenjing Yu,Xin Wang,Zhengying Gu,Qian Chen,Lan Lan,Xiaoran Sun,Yuelong Huang,Bolin Zheng,Xu Liu,Martin A. Green,Xiaojing Hao
Gas-quenching is a promising technique for the up-scalable fabrication of metal halide perovskite solar cells (PSCs). However, it has been challenging to produce high-quality gas-quenched perovskite films without the use of the methylammonium (MA) cation. By employing tetramethylene sulfoxide (TMSO) as a ligand in the precursor solution, high-quality FA0.9Cs0.1PbI3 perovskite films have been successfully obtained by gas-quenching. A study on the precursor solution and film-forming process revealed the effect of TMSO on the formation of large-grain films, as well as the critical role of gas-quenching in regulating the intermediate films. The absolute MA-free perovskite device exhibits superior stability over the PSCs obtained with the MACl additive. The fabricated MA- and Br-free PSCs show a power conversion efficiency of 21.3% without any passivation treatment. Moreover, gas-quenching with TMSO enables a wide gas pressure processing window and superior accessibility to low-pressure processing, demonstrating its promising potential in up-scaling manufacturing of high-efficiency MA-free PSCs.
研究领域:
材料科学
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太阳能技术
·
化学工程
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2014
·
IF 3.583
Chenghui Li,Xue Jiang,Xiandeng Hou
Nano-SiO 2 was immobilized on the inner wall of a dielectric barrier discharge (DBD) tube, and it was coupled to a conventional gas chromatographer to investigate its performance as a molecular emission spectrometric detector for the determination of five volatile aliphatic amines. A charge-coupled device (CCD) was applied to observe the nano-SiO 2 -enhanced molecular emission spectra. The characteristic molecular emission bands of volatile aliphatic amines at 326.5 nm, 336.0 nm and 388.3 nm can be clearly resolved from the background emission spectra of carrier gas argon. The emission band of CN at 388.3 nm was used for quantitative detection of volatile aliphatic amines due to its high sensitivity. Nanomaterial catalysts including TiO 2 , MnO 2 , SiO 2 and ZnO were tested to enhance the emission signal of amines, and SiO 2 shows the best performance. The factors that influence the emission signal, such as discharge voltage, inner electrode length and carrier gas flow rate , were investigated in detail. The analytical performance of this method was evaluated by separation and detection of the mixture of five volatile aliphatic amines. Under the optimal experimental conditions, the limits of detection were found to be 4.4, 2.5, 2.2, 1.8 and 2.4 μg for dimethylamine , trimethylamine , n-butylamine, cyclohexylamine and ethylenediamine , respectively. This GC detector is not only sensitive but also fast in response to volatile aliphatic amines with good stability. Trimethylamine in a carp fish sample was monitored with storage time by the proposed method.
研究领域:
分析化学
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材料科学
✓ 已验证
DOI
高影响因子
TALANTA
·
2010
·
IF 3.29
Huili Zhang,Lichun Zhang,Jing Hu,Pingyang Cai,Yi Lv
This work proposed a gas sensor for the determination of tert-butyl mercaptan, one of the highly toxic volatile sulfur compounds , which was based on cataluminescence emission during its catalytic oxidation on the surface of nanosized V 2 O 5 . The cataluminescence characteristics and the optimum conditions, including the morphology of sensing material, the wavelength of cataluminescence emission, the oxygen flow rate and working temperature were investigated in detail. Under the optimized conditions, the calibration curve of the relative cataluminescence intensity versus the concentration of tert-butyl mercaptan vapor was made, with the linear range of 5.6–196 μg mL −1 and the detection limit of 0.5 μg mL −1 ( S / N = 3). The relative standard deviation (R.S.D.) ( n = 5) of relative cataluminescence intensity for 84 μg mL −1 tert-butyl mercaptan was 3.6%. There is no or weak response to some common substances, such as formic acid , alcohol (methanol, ethanol, propanol, isopropanol, n -butanol, isoamyl alcohol), o -dichlorobenzene, acetonitrile , ethyl acetate , aldehyde (formaldehyde, acetaldehyde and propanal), 1,2-dichloroethane and ammonia. Furthermore, the proposed sensor was successfully used for determining tert-butyl mercaptan in four artificial samples, with a good recovery. The results demonstrated that the proposed gas sensor had a promising capability for the tert-butyl mercaptan in routine monitoring.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jingwei Lu,Gan Miao,Zhongshuai Gao,Ting Xu,Fangchao Li,Xiao Miao,Yuanming Song,Xiangming Li,Guina Ren,Xiaotao Zhu
Development of an under-liquid super-repellent (ULSR) surface that can act as a versatile platform for separating both liquid/liquid and liquid/gas mixtures is highly desirable, yet still hard to realize. Herein, to address this challenge, a Cu(OH) 2 nanowire textured surface on copper mesh was developed through a simple immersion process. The resulting Cu(OH) 2 nanowire surface displayed underwater superoleophobicity, underoil superhydrophobicity, and unusual dual superoleophobicity under immiscible oil-oil system. Exploiting its superlyophobicity under-liquid, the Cu(OH) 2 nanowire covered copper mesh was applied to separate oil/water mixtures, emulsions, and oil/oil mixtures effectively, even though the surface tension between two liquids was just 2.4 mN/m. The separation efficiency is higher than 99% for all mixtures, and the oil/water separation efficiency can maintain above 98% even after 40 cycles. Furthermore, owing to its superaerophobicity underwater and underoil, the obtained copper mesh was also able to separate gas from bulk water and oil efficiently. This work is hoped to provide a key addition to the fields of ULSR surfaces as well as membrane-based separation techniques.
研究领域:
材料科学
·
表面化学
·
分离技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jingyun Qian,Wenna Zhang,Xue Yang,Kexin Yan,Meikun Shen,Hongyue Pan,Hongjun Zhu,Lei Wang
Constructing the metal cation-mediated low-cost inorganic sorbent with high separation efficiency in CO 2 , N 2 , and CH 4 remains a major challenge. Herein, we developed a series of alkali metal cations (Na + , K + , Rb + , Cs + )-exchanged ERI zeolites and adopted in the separation process of CO 2 among the gas mixture. Among the ion-exchanged zeolites, the zeolite K-ERI showed a high adsorption volume of 70.84 cm 3 g −1 and an IAST selectivity of CO 2 /CH 4 : 6254, CO 2 /N 2 : 2872 at 298 K, respectively, far outweighed the reported metal cation exchanged zeolites. Combining powder X-ray diffraction crystallography and density functional theory calculations, we unequivocally unveiled that the metal cations located at s 8 r effectively tailored zeolite aperture, and metal cation-gas molecules interactions synergically restrained the pass-through capacity of CO 2 in ion-exchanged ERI framework. Such a unique host–guest interaction governed by metal cations in aluminosilicate zeolite ERI affords a general strategy for gas separation.
研究领域:
材料科学
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化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Tian-Tian Ma,Cheng Yang,Hai-Long Qian,Xiu-Ping Yan
Separation of isomers is important in diverse areas such as life science, chemical industry, pharmaceutical and environmental science, but still challenging due to their similar physicochemical properties. Development of new stationary phases is an effective way to improve the performance of chromatography for the separation of isomers. Here, we report the post-modification of a new hydroxyl-functionalized covalent organic framework (COF) TzDHNDA with [(1-phenylethyl)amino]acetic acid (PEAA) via esterification reaction to construct PEAA functionalized COF (TzDHNDA-PEAA). The prepared TzDHNDA-PEAA was stable up to 380 °C and used as stationary phase to make TzDHNDA-PEAA coated capillary column for gas chromatographic separation of isomers. The TzDHNDA-PEAA coated capillary column showed a high column efficiency for n -dodecane (12417 plates m −1 , 120 °C) and high resolution separation of the isomers of fluoroaniline ( R m -/ o - =3.2, R p -/ m - =2.4), chloroaniline ( R m -/ o - =5.7, R p -/ m - =1.8), nitrotoluene ( R p -/o- =2.2, R m -/ p - =1.7), pinene ( R β -/ α - =2.4), ionone ( R β -/ α - =4.8) and 1,3-dichloropropene ( R E -/ Z - =2.0). The fabricated column offered better separation of chloroaniline isomers than commercial capillary columns InertCap WAX, InertCap 1701 and InertCap 5. The introduced benzene ring, secondary amine and carbonyl groups of PEAA into the COF TzDHNDA significantly improved the resolution of isomers due to the enhanced hydrogen-bonding and π-π interactions. This work shows that post-modification strategy is an effective way to prepare novel COFs for chromatographic separation of isomers.
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 37
·21151-21157
·
IF 12.732
Jing-Xuan Guo,Cheng Yang,Xiu-Ping Yan
The unique properties of covalent organic frameworks (COFs), such as a large specific surface area, good stability and easy functionalization, make them have good potential in the field of separation science. However, the synthesis of chiral COFs is challenging, so the application of COFs in chiral separation is very limited. Here, we show a simple and effective “thiol–ene” click strategy to construct chiral COFs. The chiral COF CTzDva showed high thermal stability and good porosity, prompting us to explore its application in chromatographic separation. The CTzDva-based gas capillary column showed good separation of benzene/cyclohexane, and racemates (citronellal and fenchone). This work provides a promising platform for the synthesis of chiral COFs and expands the application of COFs in the field of separation.
研究领域:
材料科学
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分析化学
·
分离科学
✓ 已验证
DOI
高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 3
·427-442
·
IF 11.534
Zhang Yu,Han Shuai,Wang Mingyuan,Liu Siwei,Liu Guiwu,Meng Xianfeng,Xu Ziwei,Wang Mingsong,Qiao Guanjun
One-dimensional nanofibers can be transformed into hollow structures with larger specific surface area, which contributes to the enhancement of gas adsorption. We firstly fabricated Cu-doped In 2 O 3 (Cu-In 2 O 3 ) hollow nanofibers by electrospinning and calcination for detecting H 2 S. The experimental results show that the Cu doping concentration besides the operating temperature, gas concentration, and relative humidity can greatly affect the H 2 S sensing performance of the In 2 O 3 -based sensors. In particular, the responses of 6%Cu-In 2 O 3 hollow nanofibers are 350.7 and 4201.5 to 50 and 100 ppm H 2 S at 250 °C, which are over 20 and 140 times higher than those of pristine In 2 O 3 hollow nanofibers, respectively. Moreover, the corresponding sensor exhibits excellent selectivity and good reproducibility towards H 2 S, and the response of 6%Cu-In 2 O 3 is still 1.5 to 1 ppm H 2 S. Finally, the gas sensing mechanism of Cu-In2O3 hollow nanofibers is thoroughly discussed, along with the assistance of first-principles calculations. Both the formation of hollow structure and Cu doping contribute to provide more active sites, and meanwhile a little CuO can form p–n heterojunctions with In 2 O 3 and react with H 2 S, resulting in significant improvement of gas sensing performance. The Cu-In 2 O 3 hollow nanofibers can be tailored for practical application to selectively detect H 2 S at lower concentrations.
研究领域:
材料科学
·
纳米技术
·
化学
✓ 已验证
DOI
高影响因子
ANALYTICAL LETTERS
·
2015
·
IF 1.03
Kaixiang Zhu,Shuguo Gong,Yunhui Dai,Suxing Tuo,Zhenghua Liu,Liangyou Qian,Jia Peng,Fangqin Zhou
This study establishes an analytical method for the determination of eighteen preservatives in water-based adhesives. The method was based on liquid–liquid extraction by methyl tertiary-butyl ether and subsequent determination by gas chromatography–mass spectrometry. Experimental conditions (instrumental parameters, extraction solvent, extraction mode, dispersant volume, and extraction time) were optimized and validated. When the method was applied to water-based adhesives, the limits of detection and recovery were 2.29–17.59 milligrams per kilogram and 85.7 − 93.9 percent, respectively, and the repeatability was below 5 percent for all analytes. None of the analytes were found in five cigarette adhesives.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Shuwen Yu,Shichun Li,Yu Liu,Sheng Cui,Xiaodong Shen
Microporous polymers possessing good processability and low cost show promising applications for large-scale industrial membrane separation . The relatively low gas selectivity and physical aging of microporous polymer membranes are current challenges which become more serious for ultrathin membranes. Crosslinking is an effective way to improve gas selectivity and physical aging resistance of glassy polymers , and the cross-linked ultrathin membranes can be directly produced by interfacial polymerization (IP). However, there are only a few reports of IP formed microporous polymer membranes, and the reported gas separation performance is not satisfying. In this work, ultrathin microporous polyarylate (PAR) membranes were prepared by IP of 5,5′,6,6′-tetrahydroxy-3,3,3′,3′-tetramethylspirobisindane (TTSBI) and trimesoyl chloride (TMC). The crosslinking structure, molar ratio of TTSBI to TMC ( n (TTSBI) / n (TMC) ) in PAR, and membrane thickness characterized by zeta potential measurements, X-ray photoelectron spectroscopy and scanning electronic microscope were optimized by adjusting IP parameters such as pH value of aqueous phase that decides the hydrolysis of both TTSBI and TMC in IP, and the concentrations of TTSBI and TMC. The microporous structures of PAR characterized by CO 2 adsorption are highly relevant to the n (TTSBI) / n (TMC) in PAR. The resulted membranes exhibit CO 2 permeance in a wide range of 100–2115 GPU with CO 2 /N 2 selectivity of 45–21 that is a remarkable improvement in gas separation performance of IP formed microporous polymer membranes and also shows significant advantages over other reported ultrathin microporous polymer membranes. In addition, the membranes also exhibit excellent stability, and only 29% decrease in CO 2 permeance was observed after 180 h aging. This work provides an effective strategy to fabricate high-performance and stable microporous polymer membranes by IP, which is expected to push the particle applications of microporous polymer membranes in gas separation.
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhaohao Li,Run Qi,Zheng Zhang,Heng Zhang,Haiping Chen,Dan Gao
Condensation is the common mechanism of water intake from gases. Transport membrane condenser is a newly proposed technology to recover water from flue gas based on the mechanism of condensation. Most of the existing heat transfer research on transport membrane condenser focuses on water vapor phase change or fluid convection heat transfer, and there is a lack of research on the thermal conductivity of ceramic membranes. The significance of studying thermal conductivity is to optimize the overall heat transfer performance. The thermal conductivity of alumina ceramic solid materials is not good enough, which can affect the industrial application performance to a certain extent. There is currently a lack of experimental measurements or theoretical calculations to quantitatively characterize the thermal conductivity of ceramic membranes. This affects the optimization of overall heat transfer performance of transport membrane condenser. In this paper, coal fly ash is used as the raw materials to prepare macroporous ceramic membranes. Coal fly ash is a very cheap material. It can greatly reduce the manufacturing cost of transport membrane condenser using coal fly ash to prepare ceramic membranes. The classical theoretical model of thermal conductivity of porous materials is introduced, the calculation and experimental results are compared, and the validity and limitation of the classical models in analyzing the heat transfer problem of transport membrane condenser are discussed. Finally, based on the composite effective medium theory, combining with the experimental results, a modified model is proposed. The modified model reduces the average theoretical error to 7.20%, and enriches the research on the heat transfer theory of transport membrane condenser.
研究领域:
材料科学
·
热力学
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）