ANALYTICAL LETTERS
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2024
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IF 1.6
Yigong Geng,Shun Zhang,Jing Lin,Xuchu Zhu,Wenqing Gao,Junhui Li,Chenlu Wang,Yong Wu,Renlu Han,Keqi Tang,Jiancheng Yu
Ethanol abuse is increasingly becoming a global issue, adversely affecting both society and families. In blood alcohol concentration (BAC) detection, traditional techniques have long experimental cycles and harsh experimental conditions and often fail to produce timely results. Consequently, achieving swift and precise on-site detection of ethanol poisoning in humans poses a formidable challenge in analytical science. We designed a novel assay for swift on-site analysis of ethanol and BTEX (benzene, toluene, ethylbenzene, and xylene) poisoning in humans using a custom portable headspace injector (portable HS) and portable gas chromatography-mass spectrometry (portable GC-MS). This setup, known for its lightweight design and speed, allows on-site sampling and delivers rapid results. We established a calibration curve (R2 > 0.99) for ethanol in blood using portable gas chromatography-mass spectrometry (portable GC-MS). This on-site blood alcohol concentration (BAC) assay proves simpler than traditional methods, enabling rapid analysis of each sample within a short timeframe and requiring only a small blood volume (0.1 ml). In addition to our investigation on ethanol, we developed a portable method for detecting BTEX in blood. This method provides a favorable coefficient of determination (R2 > 0.99) for various substances, thereby broadening the utility of portable mass spectrometry in areas such as traffic inspection and forensic identification.
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POLYMER
·
2024
·
IF 4.1
Dongpeng Li,Zhao Ke,Ke Xu,Tao Li,Dandan Li,Wei Wang,Guangtao Qian,Chunhai Chen
Two novel spiro-bis-benzimidazole-based diamines were synthesized and polymerized with commercial 4,4′-(hexafluoroisopropylidene)diphthalic anhydride dianhydride (6FDA) to produce two types of spiro-bis-benzimidazole-based polyimides (PIM-PBZIs). The resulting polymer membranes, PIM-PBZI-1 and PIM-PBZI-2, exhibited excellent thermal and mechanical properties, including glass transition temperature (T g ) of 417 and 413 °C, 5 % thermal decomposition temperature (T d5% ) above 500 °C, tensile strength of 72 and 74 MPa, and an elongation at break of 6.6 and 5.4 %. Additionally, these PIM-PBZIs were confirmed as novel microporous polymers with BET surface areas of 473–546 m 2 /g and pore sizes ranging from 4 to 9 Å. Furthermore, PIM-PBZI-1, modified with N -phenyl, demonstrated excellent organic solubility and gas separation performance, with CO 2 /CH 4 gas pair permeability selectivity exceeding the 1991 Robeson upper bound, providing an effective pathway for the development of high-performance gas separation membranes.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
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IF 7.7
Yan Wang,Chong Li,Xuejin Li,Jinghan Zhang,Xinghong Chen,Xueming Hong,Jingting Luo,Zhenglong Sun,Fujian Ren,Ran Tao,Yuzhi Chen
The detection of toxic ammonia (NH 3 ) gas across multiple channels at room temperature, especially under complex conditions, consistently presents a significant challenge. In this paper, a plasmonic Pt-doped SnO 2 enhanced quantum wires NH 3 gas sensor is constructed on a 125-µm communication fiber with easy networking. To enhance usability in confined areas, the sensor features a compact plug-in fiber probe design. The plasmonic Pt-doped SnO 2 enhanced quantum wires coating boosts the interaction between NH 3 gas molecules and oxygen adsorbed on the wires' surface, modulating the plasmonic optic signal. We present and compare two optical modulation methods-wavelength and intensity-for our NH 3 gas probe. Our sensor achieves an impressive intensity sensitivity of -10.45 a.u./ppm at room temperature with a rapid response time of 3.8 s. Furthermore, intensity modulation offers an exceptionally low detection limit of 287 ppb, with minimal susceptibility to temperature and humidity variations. The proposed fiber NH 3 gas probe exhibits commendable specificity, repeatability, stability, and cost-effectiveness, along with flexibility in light source and receiver choices, making it ideal for NH 3 gas detection applications.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Zilong Zhang,Xia Qin,Cuicui Xu,Fanbin Zhang,Xinrui Liu,Yumei Yang
In this study, an electro-Fenton gas diffusion electrode featuring air self-respiration was fabricated by incorporating carbon nanotubes, carbon nitride, and polytetrafluoroethylene onto graphite felt. The fabrication process involved a synergistic approach of ultrasonic impregnation and vacuum filtration, establishing a gas–liquid-solid tri-phase interface both on the surface and within the electrode. This preparation method facilitates autonomous air intake, diffusing it to the tri-phase reaction interface, thereby eliminating the necessity for aeration and reducing operational costs. The optimal electrode preparation conditions were determined through Box-Behnken Design response surface experiments, leading to the enhancement of H 2 O 2 production conditions. Under the optimized conditions, H 2 O 2 accumulation reached 45.83 mg L −1 cm −2 h −1 , surpassing the performance achieved with conventional ultrasonic impregnation and vacuum filtration methods. Furthermore, the performance of self-breathing and the impact factors are explored. Finally, the electrode’s efficacy was demonstrated through the degradation of phenol and bisphenol A with concentrations of 100 mg L −1 exhibiting degradation rates of 92 % and 95 %, respectively, within 60 min.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 22
·11131-11142
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IF 8.867
King Cheong Lam,Bolong Huang,San-Qiang Shi
We report on the relationship between the degree of reduction of graphene oxide (GO) and its room-temperature methane gas-sensing response by comparing four in situ reducing agents of GO: D-glucose, sodium borohydride, L-ascorbic acid and hydrazine hydrate. We found that gas sensing based on D-glucose and L-ascorbic acid had a higher gas response than that based on sodium borohydride and hydrazine hydrate because the residues contained oxygen functional groups. The poorly conductive GO was successfully reduced in situ by L-ascorbic acid to achieve high electrical conductivity and a high methane gas response. The incorporation of tin dioxide (SnO2) into the reduced GO (RGO) further increased the gas response by the p–n junction effect. The heterostructure of L-ascorbic acid-reduced RGO–SnO2 had the highest increase in methane response due to the synergistic effect between dehydroascorbic acid and the SnO2 surface. This was inferred from density functional theory calculations with self-consistently determined Hubbard U potentials (DFT+U). Compared with the current room-temperature methane sensing and fabrication technologies, the sensing technology reported here is cheaper to produce and more environmentally friendly while retaining the best sensitivity and wider sensing range.
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MACROMOLECULES
·
2024
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IF 5.1
Yuxuan Zhao,Jiangzhou Luo,Min Chen,Jun Hu,Honglei Ling,Xueping Zong,Song Xue
Herein, we developed a new diamine monomer termed TA-BOC that features a tert-butoxycarbonyl (t-Boc) protected group. This t-Boc group could shield one of the reactive amine sites present in the commercial tris(4-aminophenyl)amine (TAPA) monomer. Then, this difunctional TA-BOC analogue is employed as a comonomer alongside TAPA and 6FDA to regulate the cross-linking density of polyimide material by varying the molar ratio of TAPA to TA-BOC. Moreover, due to the bulky steric hindrance of the t-Boc group, we attempted to remove the t-Boc group via thermal treatment to create more microporosity within membranes. Therefore, because of the synergistic effect of reduced cross-linking density and heat treatment, the gas separation performance of the prepared membranes is greatly improved. Furthermore, the presence of trifunctional TAPA monomer in the network structures significantly enhances the membrane’s resistance to plasticization. For instance, 6F-TA:TA-BOC(1:3)-450 has a high CO2 permeability of 865.3 Barrer and an excellent CO2/CH4 selectivity of 41.8, meanwhile its CO2 plasticization pressures exceeding 35 bar. These values surpass the 2008 Robeson upper bound,, indicating its great potential for efficient gas separation processes. We expect that this study will provide new perspectives for the reasonable design of network polyimide membranes possessing an enhanced gas separation performance and strong plasticization resistance.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Dong Li,Renyi Li,Yizhou Zhao,Kaixuan Wang,Ke Fan,Wei Guo,Qi Chen,Yujing Li
Perovskite CsPbBr 3 quantum dot shows great potential in artificial photosynthesis, attributed to its outstanding optoelectronic properties. Nevertheless, its photocatalytic activity is hindered by insufficient catalytic active sites and severe charge recombination. In this work, a CsPbBr 3 @Ag-C 3 N 4 ternary heterojunction photocatalyst is designed and synthesized for high-efficiency CO 2 reduction. The CsPbBr 3 quantum dots and Ag nanoparticles are chemically anchored on the surface of g-C 3 N 4 sheets, forming an electron transfer tunnel from CsPbBr 3 quantum dots to Ag nanoparticles via g-C 3 N 4 sheets. The resulting CsPbBr 3 @Ag-C 3 N 4 ternary photocatalyst, with spatial separation of photogenerated carriers, achieves a remarkable conversion rate of 19.49 μmol·g −1 ·h −1 with almost 100 % CO selectivity, a 3.13-fold enhancement in photocatalytic activity as compared to CsPbBr 3 quantum dots. Density functional theory calculations reveal the rapid CO 2 adsorption/activation and the decreased free energy (0.66 eV) of *COOH formation at the interface of Ag nanoparticles and g-C 3 N 4 in contrast to the g-C 3 N 4 , leading to the excellent photocatalytic activity, while the thermodynamically favored CO desorption contributes to the high CO selectivity. This work presents an innovative strategy of constructing perovskite-based photocatalyst by modulating catalyst structure and offers profound insights for efficient CO 2 conversion.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Dongxu Zhang,Xin Wang,Cheng Liu,Lechun Song,Huiyuan Li,Qiyu Huang,Jianfeng Zhang
Hydrate formation is one of the major flow assurance issues for the subsea multiphase pipelines. The effects of the interaction between heavy fractions of crude oil components on hydrate behaviors are still not well understood. In this study, the effects of resins on hydrate formation behaviors in asphaltene-containing emulsions were investigated using a high-pressure reactor apparatus. The results indicated that both resins and asphaltenes inhibited hydrate nucleation and increased the induction time. Furthermore, considerable synergistic effects of asphaltenes and resins on the hydrate formation behaviors were discovered in the water-in-oil emulsions, depending on the aggregation state of asphaltenes. The addition of resins was observed to disperse the asphaltene aggregates significantly and enhance the inhibitory effect of asphaltenes on hydrate nucleation. Additionally, the calculated results of gas consumption showed that the presence of resins can decrease the growth rate of hydrates in the asphaltene-containing emulsions. A potential mechanism was presented to illustrate how resins affect hydrate formation in an emulsion with varying asphaltene aggregation states. These findings offer a better knowledge of the synergistic effects between the heavy components of resins and asphaltenes and have potential application in the hydrate management of crude oil pipelines.
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RENEWABLE ENERGY
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2024
·
IF 9
Xiaofeng Gu,Xiaomin Yan,Mingyang Zhou,Gaochang Zou,Zidai Fan,Jiang Liu
For the first time, biochar derived from a renewable resource, cotton stalk, is used as the feedstock of direct carbon solid oxides fuel cells (DC-SOFCs) for electricity and gas cogeneration. It turns out that the cotton stalk biochar has plenty of naturally grown K and Ca, which are active catalysts for the reverse Boudouard reaction in DC-SOFCs. This natural advantage of the cotton stalk biochar enables an extremely high power density of an anode-supported DC-SOFC at 850 °C, 0.9 W cm −2 , which is the highest among those of the reported DC-SOFCs. Meanwhile, high concentration of CO gas, which is an important feedstock for chemical industry, is obtained from the DC-SOFCs. The energy conversion efficiency of the electricity-gas cogeneration of DC-SOFCs reaches over 70%. A novel method, using compressed char, is proposed and carried out for continuous supply of cotton stalk char to a DC-SOFC. The present work has demonstrated the feasibility and advantages of cogenerating electricity and gas through DC-SOFCs with biochar derived from cotton stalk as the feedstock.
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RSC Advances
·
2024
·Vol. 14
·期 21
·15039-15047
·
IF 3.9
Zhixiang Deng,Zhixuan Wu,Xinkuan Liu,Zhengai Chen,Yan Sun,Ning Dai,Meiying Ge
The influence of ambient humidity on the gas-sensing characteristics of metal oxide semiconductors has been one of the greatest obstacles for gas-sensing applications. In this paper, the pure WO3 and CeO2-modified WO3 nanocubes were prepared by a simple hydrothermal method, and their gas-sensing characteristics in dry and humid atmospheres were investigated. The results show that CeO2/WO3 demonstrated excellent gas-sensing properties toward H2S with high sensitivity and high selectivity at 115 °C. Noteworthy, the humidity independence of the CeO2/WO3 increased compared to the WO3. The response retentions over the whole humidity range of the CeO2/WO3-6 and CeO2/WO3-15 sensors were 70.3, and 76%, respectively, which were much higher than the WO3 sensor (17.9%). The gas-sensing mechanism of CeO2-modified WO3 is discussed based on the gas sensitivity properties. The obtained results provide a promising route to enhance the anti-humidity properties of metal oxide semiconductor gas sensors.
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CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Guoxuan Tang,Yu Chen,Jiaojiao Chen,Lin Liu,Haocun Wen,Wenda Liu,Jingyun Liu,Zeyi Xiao,Senqing Fan
Several CoS 2 /Ni flow-through porous electrodes are fabricated to promote gas bubble release for enhanced oxygen evolution reaction. Structural characterization shows that CoS 2 catalyst is immobilized on the porous Ni substrate. The bubble average diameter can be decreased from 29.21 ± 17.9 μm to 13.38 ± 5.05 μm, and the desorption time is decreased from 1.615 s to 0.067 s, with the electrolyte velocity increasing from 0 cm/s to 2.89 cm/s at the current density of 100 mA/cm 2 . A mathematical model is proposed to describe gas bubble growth, which is found that higher current density is not bring much bigger gas bubble. The overpotential of the CoS 2 /Ni electrode for OER is 498 mV at 100 mA/cm 2 . The overpotential of CoS 2 /Ni electrode can be decreased from 754 mV to 661 mV with the electrolyte velocity increase from 0 cm/s to 9.42 cm/s at 200 mA/cm 2 with the energy required for hydrogen production reduced by 5.01 kWh/kmol.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Wen-Wang Yu,Xiang-Guang Meng,Wen Li,Li-Yu Chen,Zi-Yu Gan,Yu-Lian Zhang,Jie Zhou
Chemical conversion of CO 2 to cyclic carbonates is one of the most attractive strategies for CO 2 capture and storage utilization. Herein, a binary organocatalyst of 3-aminobenzylalcohol/ n -Bu 4 NI was used to gently catalyze the insertion of CO 2 into the terminal/internal epoxides to generate cyclic carbonates under metal-free and solvent-free conditions. Twelve representative terminal epoxides reacted with CO 2 to achieve excellent cyclic carbonate yields of up to 98.3 % at 30 °C and 1 atm CO 2 and six low activity internal di-substituted epoxides were converted to corresponding cyclic carbonates with yields of up to 96.2 %. Experiments on actual flue gas and water resistance revealed the potential industrial value of this binary organocatalyst. The yield of cyclic carbonate reached 99 % by using actual flue gas under very mild conditions of 60 °C and 1 atm. The results of 4-fold epoxide amplification experiment showed that the residual CO 2 in the flue gas was only 793 ppm after reaction at 1 atm and 60 °C, indicating the good CO 2 capture and conversion ability. Reaction kinetics and catalytic mechanism of the cycloaddition were investigated in detail. The synergistic effect among functional groups of catalysts on substrates is the essential factor for the high activity of the catalyst.
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