JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
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2022
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IF 5.168
Bobo Zhou,Wanli Kang,Haizhuang Jiang,Hongbin Yang,Zhe Li,Zhiqi Lv,Zhe Xu,Changyuan Ning,Huazheng Wang,Shuting Xie
CO 2 flooding is often used in low permeability reservoirs , but there is general fracture in the reservoir, resulting in the problem of gas channeling. To achieve anti-gas channeling in deep formation, acrylamide (AM), sodium p-styrenesulfonate (SSS) and dimethyl diallyl ammonium chloride (DMDAAC) were used as functional monomers , N′ N-methylene bisacrylamide (MBA) and polyethylene glycol 200 diacrylate (UCA) were used as crosslinking agents, a double-crosslinking nano polymer gel microsphere (DCNPM-A) was synthesized by inverse microemulsion polymerization. The synthetic process of gel microsphere was optimized by initial particle size and swell multiple (defined the ratio of gel microsphere volume after and before water absorption) as evaluation indexes. The gel microsphere was characterized by scanning electron microscopy (SEM) and elemental analysis (EDS). The anti-gas channeling ability was evaluated by one-dimensional fracture core. The structure of the copolymer without crosslinking agent was verified by 1 H NMR. The results showed that the DCNPM-A gel microsphere was regular spherical shape under the optimal synthesis process, and EDS analysis showed that the microsphere contained all the characteristic elements of monomers. The initial particle size and swell multiple of DCNPM-A gel microsphere were 217.3 nm and 13.5 respectively. The gel microsphere possessed delayed swelling. The plugging rate of DCNPM-A gel microsphere was 95.48% in the anti-gas channeling experiment. The study in this paper can provide theoretical support for the anti-gas channeling in low-permeability fracture reservoirs.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Jie Yang,Tianran Wang,Weiye Gao,Chushu Zhu,Xuyuan Yin,Peitao Dong,Xuezhong Wu
Surface acoustic wave (SAW) devices are extensively used to detect various gaseous chemicals, owing to their wireless passive potential and single-signal display. However, the sensitivity, selectivity, and long response time of the sensitive layers limit their use in detecting explosive gases. In this study, we developed a 2,4,6-trinitrotoluene (TNT) gas sensor based on the SAW device with GO/PDEA/AuNR/PATP nanocomposites. The GO/PDEA/AuNR/PATP-SAW sensor recorded a considerable negative frequency shift (−70.67 kHz) in detecting 80 ppm TNT at 25 °C/20 RH %, thus enabling the detection of 40 ppb to 80 ppm TNT with the limit of detection as low as 40 ppb (−3.02 kHz). Short response/recovery time (40 ppb: 6.2/11.8 s) with good cycling stability and selectivity were achieved. The high performance of the GO/PDEA/AuNR/PATP-SAW sensor is attributed to its large specific surface area, roughness, and porosity. The oxygen-containing and electron-rich amino groups of the GO/PDEA/AuNR/PATP provide many active sites for adsorbing TNT gas. The primary sensing mechanism is the mass and electrical load of the nanocomposite in TNT gas. It has an optimum thickness of 380 nm and room temperature as the optimum operating temperature. Therefore, this study would serve as a good basis for the research and development of next-generation acoustic gas-phase explosive sensors.
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高影响因子
APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Ao Chen Wang,Shi Kun Wang,Bo Jian Zhou,Jun Di Cheng,Qian Yu Liu,Jiang Long Pan,Yi Qiao,Yan Chun Wang,Geng Zhi Sun,Zhen Xing Zhang,Xiu Ping Gao,Xiao Jun Pan,Jin Yuan Zhou
Heterojunctions are often introduced into gas sensor electrodes due to they can lower the working temperature and increase response rate during gas-sensing detection. However, many reported core–shell structured heterojunctions show a bad synergistic enhancement effect from both components. Here, a type of side-by-side bi-component heterojunction nanofibers of NiO/In 2 O 3 (INO SBHNFs) was designed by the self-made V-channel electrospinning technique. Results showed that these SBHNFs are comprised of two component NFs that attach together side-by-side with a well-defined interface. And the sensors based on INO-10 SBHNFs show the highest response of 210 to 100 ppm ethanol at 260 °C, which is an order of magnitude higher than all those of the ones based on the In 2 O 3 and INO-10-C NFs. Moreover, the INO-10 SBHNF sensors also show a high response recovery rate (4 s/36 s) and a low limit of detection (<200 ppb). Further analysis indicates that this side-by-side design can totally utilize the heterojunctions’ motivation and the solid solution’s enhancement on the formation of depletion layer (including the transfer of electrons), and the synergistic enhancement effect from both components and their surface. Besides, the sensors based on INO SBHNFs also show a good selectivity, as well as a high long-term stability.
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高影响因子
FOOD CHEMISTRY
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2022
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IF 9.231
Xiaowei Huang,Wei Sun,Zhihua Li,Jiyong Shi,Ning Zhang,Yang Zhang,Xiaodong Zhai,Xuetao Hu,Xiaobo Zou
In this study, a fluorescence sensing platform for visual detection of hydrogen sulfide (H 2 S) based on ratiometric fluorescent substances was developed to real-time monitor meat spoilage. The copper nanoclusters (CuNCs) and nitrogen-doped carbon quantum dots (CNQDs) were used as dual emission fluorescence materials. The fluorescence ratio of the two wavelengths decreased in the sulphide concentration range of 0–3 μmolL(exp) −1 , with a detection limit of 62.7 nmolL(exp) −1 . In order to capture hydrogen sulfide gas in the air, the ratio fluorescent material is loaded on the paper base. By processing the RGB value of the photo under UV light, the detection limit of the sensor is 4.35 ppt in the range of 0 ∼ 45.2 ppt H 2 S gas concentration. This portable visual analysis greatly simplifies the steps of H 2 S gas detection while ensuring sensor stability and sensitivity. It also provides a new method for H 2 S detection during the meat storage process.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 29
·期 51
·77771-77787
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IF 5.19
Yu Jinming,Yan Weiwen,Zhu Bin,Xu Zimu,Hu Shuheng,Xi Wenhao,Lan Yan,Han Wei,Cheng Cheng
Carbamazepine (CBZ) is a typical psychotropic pharmaceutical which is one of the most commonly detected persistent pharmaceuticals in the environment. The degradation of CBZ in the aqueous solution was studied by a direct current (DC) gas–liquid phase discharge plasma combined with different catalysts (H 2 O 2 or Fe 2+ ) in this study. The concentrations of reactive species (H 2 O 2 , O 3 , and NO 3 − ) and •OH radical yield in the liquid were measured during the discharge process. The various parameters that affect the degradation of CBZ, such as discharge powers, initial concentrations, initial pH values, and addition of catalysts, were investigated. The energy efficiency was 25.2 mg·kW −1 ·h −1 at 35.7 W, and the discharge power at 35.7 W was selected to achieve the optimal balance on the degradation effect and energy efficiency. Both acidic and alkaline solution conditions were conducive to promoting the degradation of CBZ. Both H 2 O 2 and Fe 2+ at low concentration (10–100 mg/L of Fe 2+ , 0.05–2.0 mmol/L of H 2 O 2 ) were observed contributing to the improvement of the CBZ degradation rate, while the promotional effect of CBZ degradation was weakened even inhibition would occur at high concentrations (100–200 mg/L of Fe 2+ , 2.0–5.0 mmol/L of H 2 O 2 ). The degradation rate of CBZ was up to 99.1%, and the total organic carbon (TOC) removal efficiency of CBZ was up to 67.1% in the plasma/Fe 2+ (100 mg/L) system at 48 min, which suggested that high degradation rate and mineralization efficiency on CBZ could be achieved by employing Fe 2+ as a catalyst. Based on the intermediate products identified by Ultra Performance Liquid Chromatography Tandem Mass Spectrometry (UPLC–MS), the possible degradation pathways were proposed. Finally, the growth inhibition assay with Escherichia coli ( E. coli ) showed that the toxicity of plasma/Fe 2+ -treated CBZ solution decreased and a relatively low solution toxicity could be achieved. Thus, the plasma/catalyst could be an effective technology for the degradation of pharmaceuticals in aqueous solutions.
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PubMed
高影响因子
THERMOCHIMICA ACTA
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2022
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IF 3.378
Shipeng Sun,Qing Wang,Chunlei Wu,Hongpeng Liu,Baizhong Sun
The aim of this study was to identify the changes in fuel properties and pyrolysis characteristics of the torrefied real components of corn stalk. The isolated components were torrefied with simulated flue gas and nitrogen in a thermogravimetric analyzer at 230, 260 and 290 °C for 30 min. The ultimate analysis indicated that flue gas atmosphere was beneficial to improving the fuel properties of isolated components. Compared to non-oxidative atmosphere, the flue gas had a greater impact on the initial pyrolysis temperature and char yield of the isolated components. The results of mathematical deconvolution analysis (MDA) demonstrated that the pyrolysis weight losses of native mixture could be quantitatively represented by the linear summation of isolated components. The differential thermogravimetric (DTG) characteristic curves could be used to qualitative analyze the changes in relative contents of the structural components of the torrefied biomass.
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Crystals
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2022
·Vol. 12
·期 7
·948
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IF 2.67
Haolong Zhai,Xiaoping Cui,Yuping Gan
Taking the combustion tear gas mixture as the research object, the system formula was optimized by adding a different mass fraction of 5-amino-1H-tetrazole(5AT). TG-DSC, a thermocouple, and a laser smoke test system were used to characterize the characteristic combustion parameters such as combustion temperature and velocity, as well as the end-point effects such as smoke concentration and particle size. Starink’s method, the Flynn–Wall–Ozawa method, and the Coats–Redfern method were used to evaluate the pyrolysis kinetic parameters of the samples. The results show that when the mass fraction of 5-amino-1H-tetrazole in the system is 10%, the maximum combustion temperature of the sample decreases by nearly 70 °C and the smoke concentration increases by 12.81%. The kinetic study also found that with a different mass fraction of 5-amino-1H-tetrazole in the system, the main reaction model of the mixed agent in the first, third, and fourth stages of pyrolysis changed significantly, but for the second stage of sample pyrolysis, the main reaction model (the A4 model) showed a high degree of consistency, which can be considered as the thermal diffusion stage of the tear agent capsicum oleoresin (OC) (the temperature range is 220~350 °C), which is highly consistent with the results of the TG-DSC analysis. It was also confirmed that OC’s thermal diffusion is mainly concentrated in this stage. The results of this study show that adding an appropriate amount of the combustible agent 5-amino-1H-tetrazole to the combustion tear gas mixture can improve its combustion performance and smoking performance, which provides an important, new idea for the development of a new generation of safe, efficient, and environmentally friendly tear gas mixtures.Keywords:5-amino-1H-tetrazole;tear gas mixture;combustible agent;combustion pyrolysis characteristics;dynamics research
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Lili Sun,Yun Guo,Yanchao Liu,Ronghua Ni,Gang Chen,Xiaoshun Wei,Zebin An,Zheng Jiao
Modification of traditional metal oxides to prepare gas sensors with excellent response and high selectivity for monitoring air pollution, is a pivotal indicator for the development of gas sensing technologies. In this research, the core-shell Tourmaline@ZnO/MWCNT micro-nanostructured composite was successfully constructed and prepared by the uniform co-precipitation and hydrothermal methods , which effectively achieved the high sensitivity to n-butanol. The structure, morphology and surface electron valence state were characterized by employing important analytical techniques. With tourmaline as the inner-core and MWCNT-interspersed ZnO nanosheets as the outer-shell, the uniquely hierarchical micro-nanostructure covered a larger specific surface area, which provided more active sites during the reaction. Meanwhile, the performance assessments demonstrated that the proposed micro-nano structure exhibited exceptional gas-sensing properties, while Tourmaline@ZnO/ 0.9%MWCNT sensor reaching the highest response value to 185.8–100 ppm n-butanol far exceeding other detected gases, additionally with a faster response-recovery time. The presence of tourmaline and the interspersion of MWCNT played a synergistic effect on the enhancement of the properties for ZnO-based gas sensors, which brought about a beneficial impact on the carrier transport. This technical strategy should be of certain significance in the intelligent preparation and extensive application of high-performance sensing devices in the future.
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JACS Au
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2022
·
IF 0
Yuhai Sun,Junliang Wu,Yaolin Wang,Jingjing Li,Ni Wang,Jonathan Harding,Shengpeng Mo,Limin Chen,Peirong Chen,Mingli Fu,Daiqi Ye,Jun Huang,Xin Tu
Plasma-catalytic CO2 hydrogenation is a complex chemical process combining plasma-assisted gas-phase and surface reactions. Herein, we investigated CO2 hydrogenation over Pd/ZnO and ZnO in a tubular dielectric barrier discharge (DBD) reactor at ambient pressure. Compared to the CO2 hydrogenation using Plasma Only or Plasma + ZnO, placing Pd/ZnO in the DBD almost doubled the conversion of CO2 (36.7%) and CO yield (35.5%). The reaction pathways in the plasma-enhanced catalytic hydrogenation of CO2 were investigated by in situ Fourier transform infrared (FTIR) spectroscopy using a novel integrated in situ DBD/FTIR gas cell reactor, combined with online mass spectrometry (MS) analysis, kinetic analysis, and emission spectroscopic measurements. In plasma CO2 hydrogenation over Pd/ZnO, the hydrogenation of adsorbed surface CO2 on Pd/ZnO is the dominant reaction route for the enhanced CO2 conversion, which can be ascribed to the generation of a ZnOx overlay as a result of the strong metal–support interactions (SMSI) at the Pd–ZnO interface and the presence of abundant H species at the surface of Pd/ZnO; however, this important surface reaction can be limited in the Plasma + ZnO system due to a lack of active H species present on the ZnO surface and the absence of the SMSI. Instead, CO2 splitting to CO, both in the plasma gas phase and on the surface of ZnO, is believed to make an important contribution to the conversion of CO2 in the Plasma + ZnO system.
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PubMed
APPLIED CATALYSIS A-GENERAL
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2022
·
IF 5.723
Minjie Xu,Chenxi Cao,Jing Xu
Direct CO 2 hydrogenation into linear α-olefins presents a promising route in carbon-neutral chemical manufacture. This work systematically investigated the variable interplay between Reverse Water-Gas Shift (RWGS) and Fischer-Tropsch Synthesis (FTS) during CO 2 hydrogenation using model Na-Fe 5 C 2 catalysts, combining dynamic/steady-state CO/CO 2 hydrogenation performance, intrinsic kinetics and multiple characterization results. Na-Fe 5 C 2 proves to be surface-enriched with FeO x sites over which RWGS readily proceeds. Meanwhile, CO 2 conversion under integral reaction conditions is limited by the subsequent FTS step due to a lack of available FeC x sites. The catalyst performance is steered by the properties and relative quantities of the two different active sites. Na addition promotes the refresh of FeO x sites and β-elimination of alkyl intermediates over FeC x sites, but at the cost of inhibiting the surface fraction of FeC x sites and thus the single-pass CO 2 conversion. These fundamental understandings will enlighten further development of CO 2 hydrogenation catalysts with improved hydrocarbon yields.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 21
·10062-10066
·
IF 3.925
Yongrui He,Bing Zheng,Meiling Qi,Lijun Huo
This work reports the separation performance of a new π-conjugated copolymer (PBDB-T) with alternating electron-donor and electron-acceptor units as the stationary phase for capillary gas chromatography (GC). To date, they have not been explored in the field of chromatography. The PBDB-T column exhibited a column efficiency of 3850 plates m−1 determined by n-dodecane at 120 °C and high-resolution performance toward a wide range of aromatic isomers, particularly halobenzenes, phenols, anthracene and phenanthrene. Moreover, it showed excellent separation repeatability and reproducibility in terms of run-to-run, day-to-day and column-to-column and good thermal stability. This work demonstrates the good potential of the indicated D–A copolymer as a new class of stationary phase for chromatographic analyses.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Jia Zhou,Tian Lan,Tianchi Li,Qi Chen,Pu Bai,Fang Liu,Zhongwei Yuan,Weifang Zheng,Xiaolin Luo,Wenfu Yan,Taihong Yan
Spent fuel reprocessing is the main part of the closed recycling of nuclear fuel. The efficient capture of radioactive iodine in spent fuel reprocessing remains a major issue for the safe utilization of nuclear energy. To possibly substitute the silver-containing zeolites of high cost, copper-doped porous silica including microporous silicalite-1 zeolite (denoted as Cu-S-1) and mesoporous SBA-15 (denoted as Cu-SBA-15) different from those of copper-exchanged ones previously reported were investigated for iodine adsorption at moderate temperature. The influence of pore diameter on iodine adsorption was emphatically discussed. Because of the nanosized pore structure, Cu-S-1 and Cu-SBA-15 exhibited high iodine adsorption capacities of 501 mg g −1 and 59 mg g −1 , respectively. The iodine adsorption capacity of Cu-S-1 was higher than those of the silver-containing ones reported up to now. Moreover, it was revealed that the microporous structure was more beneficial to adsorb iodine than the mesoporous structure. These copper-doped silica zeolites provide the possibility for the application of iodine adsorption in practical post-processing conditions.
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