FIBERS AND POLYMERS
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2023
·Vol. 24
·期 12
·4155-4167
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IF 2.5
Ni Jing,Li Jinling,Wei Bowen,Shi Yufei,Liu Chanjuan,Zhou Li,Huang Xiaohua
A novel 4-(4-(1-morpholinyl)phenyl)-2,6-bis(4-aminophenyl)pyridine (MPAP) diamine monomer was designed and synthesized by introducing non-coplanar morpholine groups and pyridine heterocyclic structures. By one-step homopolymerization of MPAP and different dianhydrides, three new polyimides (PIs) were synthesized. The obtained PIs are easily soluble in common organic solvents, such as NMP, DMAc, and CHCl 3 . Simultaneously, PIs have high thermal performance ( T g = 277–377 °C) and excellent thermal stability ( T d,5% and T d,10% are 460–487 °C and 525–545 °C). They also have good optical transparency ( λ cutoff = 380–394 nm, λ 80% = 469–482 nm) and hydrophobicity ( θ = 87–92º). The free volume and gas adsorption are simulated by Materials Studio 2019 software, and the simulation results match the gas separation performance obtained from experimental test. They show good gas separation performance as well, especially PI-3 for the CO 2 /N 2 (up to 23.26), O 2 /N 2 (up to 5.02) and He/N 2 (up to 59.78) separations, which is close to the 1991 Robeson upper bound.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Hanlin Li,Xiaohui Fang,Chen Kang,Zhoutao Sun,Hongmei Liu,Xinping Zhang
Rapid trace gas identification is challenging due to the low adsorptivity of gaseous molecules on solid substrates under ambient conditions. In this article, we present a gas sensor utilizing a capillary serving as a surface-enhanced Raman scattering (SERS) probe. The capillary is decorated with densely distributed Ag/ZnO nanocomposites within its microchannel, resulting in an enlarged specific surface area that enhances gas adsorption and chemical enhancement and provides abundant SERS hotspots. The introduction of gas into the capillary leads to the immediate appearance of distinctive Raman characteristic peaks, and the entire measurement process can be performed under ambient conditions. The detection limit for gases of NO2 and SO2 reaches as low as 0.1 ppb. Furthermore, the sensor exhibits the capability to identify components of mixed gases as well as effectively detect NO2 in vehicle exhaust emissions. With all of these advantages, the SERS-active capillary demonstrates promising potential for practical applications, particularly in the rapid and accurate identification of trace-level gases.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Tingzhan Wang,Jingkun Chen,Jiaxuan Chen,Xuan Yao,Gang Chen,Zheng Jiao,Jing-Tai Zhao,Shuai Cheng,Xue-Chun Yang,Qianli Li
N-butanol gas is a common volatile organic compound (VOC) that can pose a threat to human health and pollute the atmospheric environment. However, the n-butanol gas sensors suffer from low response and selectivity. Herein, we synthesized the Ga-doped ZnO (ZOG) sensors by one-step hydrothermal treatment and subsequent calcination. The oxygen vacancies content of 1-ZOG has increased by 46 % compared to pure ZnO. Rich oxygen vacancies can increase the response signal of 1-ZOG to 174.78 in darkness for 100 ppm n-butanol, which is 2.4 times that of ZnO. Furthermore, the gas sensing performance of 1-ZOG is improved by light excitation. Under UV irradiation, the response of 1-ZOG sensor to 100 ppm n-butanol is 3.6 times that of pure ZnO, up to 636.81. Meanwhile, the response signal of 1-ZOG to n-butanol is at least 6.32 times that of other gases under UV light, showing ultra-high selectivity. This study proved that both Ga doped and photo-excited are effective strategies for improving the sensitivity and selectivity of ZnO based gas sensors.
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DESALINATION
·
2023
·
IF 9.9
Yunze Zhao,Huifang Xing,Meng Rong,Zheng Li,Xuetuan Wei,Congmei Chen,Huizhou Liu,Liangrong Yang
The lithium extraction from emerging unconventional oil and gas (UOG) field brine by β -diketone synergic system was established and systematically studied for the first time. A synergistic system consisting of dibenzoylmethane (DBM) and trioctylphosphine oxide (TOPO) was screened for lithium extraction through high-precise DFT calculation, and the synergistic effects were revealed by FT-IR analysis. A state-of-the-art Li + -Mg 2+ -Ca 2+ co-extraction and Li + selective stripping (CESS) process was proposed to achieve high lithium recovery efficiency. The effects of saponification, phase ratio, extractant composition and stripping acidity on extraction efficiency were systemically studied using real UOG field brine. After three-stage countercurrent extraction, the lithium extraction efficiency reached 98.1 % with the DBM concentration of 0.25 mol/L, TOPO concentration of 0.25 mol/L, and saponification of 70 %. After selective stripping and scrubbing with gradient HCl concentrations, Li + was further separated from Na + , Mg 2+ and Ca 2+ . The mass ratio of Mg 2+ /Li + was reduced by 49.7 times, Na + /Li + was reduced by 102.4 times. This work bridged the gap in the solvent extraction of lithium resources from UOG field brines and provided ideas for UOG field resource exploit and comprehensive utilization.
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FUEL
·
2023
·
IF 7.4
Bo Liao,Jinsheng Sun,Jintang Wang,Xindi Lv,Jianlong Wang,Jianxun Guo,KaiheLv,Ren Wang,Junjie Zheng,Zhangxin Chen
Drilling fluid systems with exceptional performance serve as a foundation for commercial hydrate extraction. However, most hydrate reservoirs are located at relatively deep water depths and have shallow burial depths. As a result, there are high demands on the density of a hydrate drilling fluid system. Thus, the traditional hydrate drilling fluid system no longer meet the drilling needs in deep water shallow hydrate reservoirs. In this paper, a copolymer SYZ-2 was synthesized based on N-Vinyl-ε-caprolactam and N, N-dimethyl acrylamide. The effects of SYZ-2 and its NaCl system on methane hydrate were first tested by a constant rate cooling method, and the inhibition mechanisms of the system on hydrate nucleation and formation were investigated by molecular simulations. Meanwhile, the formulation and properties of a low-density hydrate drilling fluid system (1.06 g/cm 3 ) based on SYZ-2 were also described in detail. The experimental results show that the hydrate formation temperature with the influence of SYZ-2 decreases from 10.6 °C to 2.7 °C, which can even be significantly reduced to −3.1 °C in the presence of 7 % NaCl. The molecular dynamic simulation results show that SYZ-2 inhibits the nucleation of hydrates by decreasing the solubility of methane molecules, primarily by promoting the agglomeration of methane molecules. Additionally, SYZ-2 can also adsorb to the surface of hydrates and prevent the hydrate cage structure from capturing methane molecules. In contrast, NaCl inhibits hydrates formation by restricting the movement of water molecules. These results provide valuable insights into a better understanding of the gas hydrate inhibition mechanisms, the rational development of high-performance hydrate inhibitors for drilling fluids, as well as the construction of drilling fluid systems.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Xinnian Gou,Peng Shen,Jiang Wu,Xingyue Qi,Fei Qi,Ping He,Hong Yao,Guangqian Luo,Qizhen Liu,Yongfeng Qi
CaSiO 3 exhibits good arsenic capture performance, but it falls short of meeting the actual needs of power plants due to its susceptibility to acidic gases that inhibit its arsenic capture ability. In this study, an Al 2 O 3 /CaSiO 3 adsorbent was prepared by combining the anhydrous grinding and calcining methods. Arsenic vapor capture was conducted in flue gas containing or free of SO 2 and HCl within the temperature range of 800–1000 ℃. The research indicated that the preparation method used in this study resulted in uniform Al 2 O 3 doping that was less prone to agglomeration, thereby creating a good pore structure. The Al 2 O 3 /CaSiO 3 adsorbent exhibited the strongest arsenic capture capacity when the atomic molar ratio of Al/Si was 1:5, with an arsenic capture amount of 871.2 mg/kg, which was significantly higher than the capture capacity of the control group calcium silicate . The doping of Al atoms altered the structure and charge distribution of CaSiO 3 silica-oxygen chains, resulting in the formation of Al active sites with higher adsorption energy, which is more favorable for the adsorption of arsenic. Although the Al 2 O 3 /CaSiO 3 adsorbent reacts with acidic gases to form CaSO 4 and CaCl 2 , which can inhibit arsenic capture, it still maintains a high arsenic capture rate. Al 2 O 3 /CaSiO 3 has excellent arsenic removal, sintering resistance, and acid resistance, making it a promising composite adsorption material for arsenic removal.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 45
·2304718
·
IF 19
Xin-Yu Huang,Keyu Chen,Wenhe Xie,Yanyan Li,Fan Yang,Yu Deng,Jichun Li,Fengluan Jiang,Yan Shu,Limin Wu,Wan-Feng Xie,Yonghui Deng
Acetic acid (CH 3 COOH) detection with high selectivity at low temperatures is significant due to its wide applications in the chemical, medical, and catering industries. Chemiresistive gas sensors based on metal oxide semiconductors (MOSs) are widely used in detecting various gases, but it is necessary to develop MOSs with novel nanostructures to enhance gas-sensing performance. Herein, a series of bismuth subcarbonate (Bi 2 O 2 CO 3 , abbreviated as BCO) microspheres with highly permeable lamellar structure and tunable Sn-doping ratios (0–5 at%) is synthesized by controlling kinetics equilibrium of the hydrothermal reaction. The sensor based on 3 at% Sn-doped BCO microspheres exhibits excellent gas-sensing performances toward acetic acid (10 ppm), including high sensitivity ( S = 8.3), fast recovery speed (10 s), long-term stability (over 30 days), and good selectivity at a low temperature (150 °C). The unique permeable lamellar structure assembled from 2D Sn-doped BCO nanosheets and rich Sn 4+ doping-induced active sites is mainly responsible for the enhanced gas-sensing performances. Moreover, a new acetic acid reaction process is revealed via in situ diffuse reflectance infrared transform spectroscopy. Density functional theory calculations indicate that Sn-doped BCO has a higher acetic acid adsorption energy and a larger charge transfer than pristine BCO.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Chuang Wang,Yiqi Liao,Hou-Yong Yu,Yanjuan Dong,Juming Yao
Fiber-based wearable electronic textiles have broad applications, but non-degradable substrates may contribute to electronic waste. The application of cellulose-based composite fibers as e-textiles is hindered by the lack of fast and effective preparation methods. Here, we fabricated polyaniline (PANI)/cellulose fibers (PC) with a unique skin-core structure through a wet-spinning homogeneous blended system. The conductive network formation was enabled at a mere 1 wt% PANI. Notably, PC15 (15 wt% PANI) shows higher electrical conductivity of 21.50 mS cm −1 . Further, PC15 exhibits excellent ammonia sensing performance with a sensitivity of 2.49 %/ppm and a low limit of detection (LOD) of 0.6 ppm. Cellulose-based composite fibers in this work demonstrate good gas sensing and anti-static properties as potential devices for smart e-textiles.
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PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2023
·
IF 6
Mengqi Zhong,Jinping Li,Lun Zhou,Teng Wang,Jingxin Liu,Meng Mei,Si Chen
This research investigates the mechanism of co-pyrolysis in waste-blended textiles (polyester/cotton blends). Thermogravimetry and mass spectrometry analysis were utilized to study the mass loss behavior and gas emission characteristics of cellulose (CE) and polyethylene terephthalate (PET) with various mass ratios during pyrolysis. The EA, BET and FTIR analysis were used to investigate the interaction among the solid phase products. The findings revealed a clear synergistic effect between CE and PET. When the theoretical and actual thermogravimetry/gas release curves were compared, the synergistic effect in the co-pyrolysis process inhibited a release of small volatile substances (H 2 , CH 4 , C 2 H 2 , CO and CO 2 ) at high temperatures and directly promoted hydrocarbon enrichment in solid products, which could affect the adsorption performance of solid phase products, and the inhibition effect was strongest when the ratio was 35:65.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Yu Huang,Hongjun Hu,Lixun Zhang,Guoqing Yi,Songhong Yu,Zhaohui Wang,Zhaoliang Cui,Shuaifei Zhao
Two hydrophobic porous ethylene-chlorotrifluoroethylene (ECTFE) membranes quenched in water and air were fabricated by thermally induced phase separation and used for water recovery from ammonia-containing humid gas via vapor condensation. The ECTFE membranes were further hydrophobically modified to enhance their condensation performance. The condensate water quality of the modified membrane significantly improved. The mechanisms of the NH3 contamination in the condensate water were discussed. Surface hydrophobic modification slightly increased the flux and recovery stabilities of the membranes. However, the modification also increased the membrane surface roughness, which adversely affects the vapor condensation and droplet evolution on the membrane surface and reduced the recovered water quality. From the material perspective, desirable porous membranes for vapor condensation should have high surface hydrophobicity and smoothness and reasonably large pore sizes. The reasonably large pore sizes would promote noncondensable gaseous contaminants (e.g., ammonia) to go through the membrane, thereby improving the recovered water quality.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jiayi Wu,Yuhang Zheng,Jiali Fu,Yafei Guo,Jun Yu,Jie Chu,Pu Huang,Chuanwen Zhao
Integrated CO 2 capture with reverse water gas shift (RWGS) reaction to produce syngas represents a promising technology to realize C1 recycling and utilization. Designing highly efficient Ni–CaO dual function materials (DFMs) is the key to achieve integrated CO 2 capture and utilization (ICCU). In this work, Ni–CaO–CeO 2 DFMs powders and pellets are prepared by the wet mixing, coprecipitation and sol–gel methods using acetate and nitrate precursors. Physicochemical properties and ICCU performance of the Ni–CaO–CeO 2 DFMs depend on synthetic mode, precursor, and granulation process. NiCaCe-SG (A) and NiCaCe-SG (N) prepared by sol–gel method show excellent ICCU-RWGS performance due to the developed pore structures, enhanced surface basicity, uniform Ni dispersion, minimized Ni grain size, abundant oxygen vacancies and reinforced reducibility. The NiCaCe-SG (A) sample prepared using acetate salts as precursors exhibits better ICCU-RWGS performance than the nitrate precursors-derived NiCaCe–SG (N) DFMs. Granulation adversely affects the CO 2 capture capacity, CO yield and working stability of the NiCaCe–SG (N) sample due to declined textural properties, weakened surface basicity and reducibility. NiCaCe–SG (A) represents an excellent DFMs candidate for ICCU-RWGS with high CO 2 uptake and conversion rate of 15.34 mmol CO 2 /g and 92.4 %, great CO yield and CO selectivity of 5.97 mmol CO/g and 89.1 %, and good working stability (a low decay rate of 11.6 % in 10 cycles). These results have provided new insights into the rational design of high-performance DFMs for ICCU applications.
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Energy Storage Materials
·
2023
·
IF 20.4
Muya Cai,Zhuqing Zhao,Xin Qu,Jiakang Qu,Zuojun Hu,Hao Shi,Shuaibo Gao,Dihua Wang,Huayi Yin
Many heterogeneous reduction reactions are hampered by the generated intermediate products located at the interface of reactants, resulting in reducing the reaction area or slowing down the mass transfer and thereby shutting off or slowing down the reaction. Thus, removing the unwanted intermediate products from the reaction interface is key to enabling a rapid and sufficient reduction rate and rationally mediating the product sizes and structures. Herein, we employ solid NaCl to absorb the intermediate molten ZnCl 2 generated at the liquid Zn-SiCl 4 gas interface, making the reaction happen continuously and sufficiently at a relatively low temperature of below 450 °C. In addition to refreshing the reaction interface, NaCl acts as a buffer to absorb the reaction heat, ensuring the production of hollow Si inherited from the spherical liquid Zn template. As a result, the yield of Si reaches over 95% within 2 h and the Si particle size is below 200 nm. Further, the obtained Si anode has an initial Coulombic efficiency of 86.7% and delivers a capacity of 1580 mAh g −1 at 3 A g −1 after 350 cycles with a capacity retention of 90.6%. Overall, this paper provides an effective strategy for engineering the reaction interface and revalorizing waste SiCl 4 for making Li-storage Si anodes.
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