JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 33
·e52810
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IF 3.057
Zhirong Hu,Jiayu Miu,Xiong-Fei Zhang,Mingmin Jia,Jianfeng Yao
UiO-66-NH 2 (Zr-based metal organic framework) is integrated into cellulose acetate (CA) to fabricate mixed matrix membranes (MMMs) through solvent-casting approach. To regulate the interfacial compatibility and suppress the non-selective voids, UiO-66-NH 2 with different particle sizes are investigated. The introduction of UiO-66-NH 2 provides additional pathways for gas molecules and renders the membrane with high CO 2 affinity, substantially augmenting the separation efficiency of UiO-66-NH 2 @CA composite membrane. By optimizing the particle size of UiO-66-NH 2 , the non-selective voids and the particle agglomeration can be effectively restricted. The optimum separation performance is obtained by U-100@CA membrane (UiO-66-NH 2 : 200 nm in size), exhibiting a CO 2 permeability of 168.8 Barrer with CO 2 /N 2 and CO 2 /CH 4 ideal selectivities of 40.2 and 51.3, respectively. The separation mechanism is ascribed to the presence of sufficient amine groups, the high CO 2 solubility of CA matrix, and superior inorganic–organic interfacial property.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Qin’an Zhou,Chengyu Zheng,Luyi Zhu,Jun Wang
P-type SnS and n-type SnS 2 can form SnS x heterostructure and the unique structure has been proved to possess better sensing properties. In this work, a series of SnS x was synthesized by a one-step hydrothermal method at different S/Sn molar ratios . And the QCM transducer provided a platform for SnS x samples to realize high sensitivity detection of TMA gas at low concentration (below 10 ppm threshold limit). The TMA sensing sensitivity improved as the content of SnS x heterostructure increased in 40 % RH at 25 ℃. The SnS x prepared in the S/Sn ration of 6 exhibited the best sensitivity (−22.29 Hz/ppm), good selectivity and stability with the limit of detection (LOD) of 770 ppb, suggesting the TMA sensing enhancement of SnS x heterostructure. Density functional theory (DFT) simulations verified the improved sensing response of SnS x heterostructure was ascribed to the p-n junction and weak hydrogen bonds . This heterostructure may contribute to the further development of QCM gas sensors for TMA sensing in the monitoring of food freshness and environment.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Jingfeng Weng,Junzhe Zhang,Chunyu Zhang,Jin Lv,Jinhui Liu,Chengqian Zhou,Jun Yuan,Min Wang,Dongqing Xu,Yun Zhong,Wenli Chen
Citrus Huanglongbing (HLB) is incurable, so it is necessary to develop an accurate and timely detection method for citrus HLB. Volatile organic compounds (VOCs) of plants can be used as an indicator of their health status. Based on the difference of VOCs between healthy and HLB citrus leaves, we designed the polyethyleneimine (PEI)-modified carboxylic multi-walled carbon nanotubes (CNT-COOH) gas sensor and used it in the diagnosis of citrus HLB. Our PEI/CNT-COOH sensor showed significant impedance responses to four citrus HLB biomarkers VOCs (ethylhexanol, phenylacetaldehyde , linalool and methyl salicylate) with sensitivity up to single-digit ppm. We then used the sensor to detect the VOCs in citrus leaves, and found that the diseased citrus can be distinguished from the healthy citrus according to the different response values of the sensor, successfully identified HLB-infected citrus. Compared with the conventional qPCR method, PEI/CNT-COOH sensor not only has higher accuracy, but also can be used in real time field detection of citrus leaves due to its less stringent operating condition and portability.
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SENSORS AND ACTUATORS A-PHYSICAL
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2022
·
IF 4.291
Hang Liu,Bing Liu,Peihua Li,Wenlong Kang,Yuhong Zhang
In this paper, the SnO 2 and Ce/SnO 2 nanomaterials are synthesized through a simple hydrothermal route and used for detecting NO 2 gas . The SnO 2 materials exhibit a good linearity for NO 2 detection, and the limit of detection is calculated to be as low as about 5 ppb at 10% humidity. The humidity dependence of the gas sensing characteristics of metal oxide semiconductors has been one of the greatest obstacles for gas sensor applications . The NO 2 gas sensing response of SnO 2 and Ce/SnO 2 also are investigated at 50% humidity. The Ce/SnO 2 materials show higher response than pure SnO 2 . The gas sensing mechanism of Ce/SnO 2 material is discussed in detailed. The reach results provide a new way for increasing the anti-humidity of the metal oxide semiconductor gas sensor.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Li-Wen Mao,Li-Yuan Zhu,Tao Tao Wu,Lei Xu,Xuan-Hong Jin,Hong-Liang Lu
Heterostructured Nb 2 O 5 /SnO 2 core-shell nanorods are synthesized by a facile hydrothermal strategy and atomic layer deposition (ALD). The SnO 2 shell thicknesses varying from 7 to 34 nm exhibit a significant impact on sensing performance. The response enhancement mechanism of the Nb 2 O 5 /SnO 2 core-shell nanorods is illustrated based on the electron-depletion model. The Nb 2 O 5 /SnO 2 core-shell nanorods gas sensors were synthesized based on the micro-electromechanical systems (MEMS), which could provide variable operating temperatures for the gas sensors with highly integrated design and low power consumption. The response of the Nb 2 O 5 /SnO 2 core-shell nanorods gas sensor deposited with 20 nm SnO 2 shell towards 20 ppm H 2 S at 275 °C was 4.0, which showed a 3.8-fold of improvement compared with pristine Nb 2 O 5 nanorods. Furthermore, the well-structured core-shell nanorods gas sensors maintained stable performance after three months, presenting long-term stability and repeatability. The proposed Nb 2 O 5 /SnO 2 core-shell nanorods gas sensors demonstrate a potential strategy for the practical application in oil and gas drilling platforms and other industrial fields.
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JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Can Wang,Zhili Cai,Wei Xie,Yang Jiao,Lu Liu,Lili Gong,Qi-Wei Zhang,Xiaohua Ma,Hongjun Zhang,Shuangjiang Luo
Thermally induced chemical crosslinking has attracted substantial attention for fabricating plasticization resistant membranes due to the facile structure tunability that enables the construction of robust and well-defined architecture for gas separation. In this study, we report a new series of dual thermally crosslinkable polyimides derived from 4,4′-diamino-2,2′-biphenyldicarboxylic acid (DCB) containing two carboxyl groups, and a systematic investigation of the thermal treatment above and below T g demonstrated the decarboxylation-induced crosslinking. The dual thermally crosslinked membranes were insoluble in common organic solvents and maintained excellent mechanical properties . Due to the evolution of CO 2 and collapse of chain segments during thermal treatment, the crosslinked membranes exhibited hierarchical microcavity size distribution featuring ultra-micropore size in the range of 2.0–6.0 Å and micropore size in the range of 6.5–10.0 Å. Gas transport properties of the crosslinked membranes were feasibly tuned through the chemical compositions and thermal treatment procedures. For instance, the CO 2 permeability of crosslinked 6FDA-DAM 0.7 -TFMB 0.1 -DCB 0.2 increased almost three-fold with only a slight decrease in CO 2 /CH 4 selectivity. The crosslinked membranes also demonstrated superior plasticization resistance with mixed-gas feed pressure up to 40 bar and excellent low-temperature gas separation performance at −30 °C, making them attractive for aggressive gas separations.
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JOURNAL OF CHROMATOGRAPHY A
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2022
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IF 4.601
Tao Sun,Qiuchen Huang,Wei Zhang,Ruonan Chen,Wei Li,Haipeng Chen,Shaoqiang Hu,Zhiqiang Cai
Pillar[ n ]arenes possess highly symmetrical and rigid pillar-shaped architecture with π -electron rich cavity that afford their reliable host-guest recognition interactions towards matched guests. In this work, a novel amphiphilic pillar[5]arene (P5A-C10-2NH 2 ) was designed, synthesized and employed as the stationary phase for capillary gas chromatography. To date, they have not been reported in the field of chromatography. The P5A-C10-2NH 2 capillary column (10 m × 0.25 mm i.d.) was prepared by static coating method. Its capillary column exhibited moderate polarity and column efficiency of 2265 plates/m determined by naphthalene at 120 °C. As evidenced, the P5A-C10-2NH 2 column achieved advantageous separation performance for a mixture of 24 analytes of diverse types and exhibited different chromatographic selectivity from two pillar[5]arene derivatives columns and commercial HP-35 column with 35%-phenyl-methylpolysiloxane. Moreover, the P5A-C10-2NH 2 column baseline resolved more than a dozen positional and cis - trans isomers. Furthermore, the separation mechanism of P5A-C10-2NH 2 column was discussed by quantum chemical calculations. In addition, the P5A-C10-2NH 2 column had high thermal stability and excellent separation repeatability 0.01–0.04% for run-to-run, 0.03–0.17% for day-to-day and 3.2–3.9% for column-to-column. The special amphiphilic structure and high resolution for various analytes reveal the good potential of pillararenes as a new class of stationary phases for chromatographic analyses. Moreover, the TPG column achieved improved thermal stability over the GIL column and excellent repeatability.
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PubMed
高影响因子
ELECTROANALYSIS
·
2022
·Vol. 34
·期 10
·1656-1665
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IF 3.077
Xiaohui Zhang,Ping Li,Ziwei Zhang,Jinghan Guo,Zhongying Fang,Shemsu Ligani Fereja,Kaifan Liu,Xinjie Tong,Yue Zheng,Zongjun Li,Wei Chen
In this work, fabrication of Cu 2 O@Cu 1.75 S core-shell octahedrons was achieved through a facile water bath stirring process. Compared with pure Cu 2 O, the composite showed enhanced sensing performance for NO 2 . The response value of Cu 2 O@Cu 1.75 S to 5 ppm NO 2 at 40 °C is seven times that of Cu 2 O to 5 ppm NO 2 at 75 °C. Moreover, Cu 2 O@Cu 1.75 S has the ability to detect 100 ppb NO 2 and has good NO 2 sensing selectivity and long-term stability. This study shows that Cu 2 O@Cu 1.75 S hybrid is a type of outstanding NO 2 gas sensing material on account of its low working temperature and high sensing sensitivity.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
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2022
·
IF 4.119
Mingyang Chen,Rui Yang,Pei Li
Since PMDA-ODA polyimide is insoluble, its soluble precursor PMDA-ODA poly (amic acid) (PAA) is used to prepare hollow fiber membranes (HFMs). Due to the existence of –CO–NH– and –COOH groups, PAA is subject to form hydrogen bonds with water and consequently leads to a very slow phase inversion rate during the non-solvent induced phase inversion process. Therefore, the hollow fiber spinning has to be carried out with a low take-up speed that limits the productivity. In this paper, we increased the take-up speed of PAA hollow fiber to 60 m/min by simply adding LiCl into polymer dope. Moreover, an integrally skinned defect-free PMDA-ODA hollow fiber membrane was obtained at the high take-up speed where the gas permeances were 6.8 ± 0.7, 2.2 ± 0.2, 0.4 ± 0.04 and 0.07 ± 0.01 GPU for H 2 , CO 2 , O 2 and N 2 , respectively, with an ideal selectivity of 3.1 ± 0.3, 31 ± 3.0 and 5.7 ± 0.6 for H 2 /CO 2 , CO 2 /N 2 and O 2 /N 2 , respectively. These results indicated a dense PMDA-ODA layer of 1 μm. To our best knowledge, this is the first time that a defect-free hollow fiber membrane for gas separation is prepared based on PMDA-ODA.
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AICHE JOURNAL
·
2022
·Vol. 68
·期 7
·e17662
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IF 4.167
Guoxuan Li,Qinghua Liu,Chengmin Gui,Zhigang Lei
Deep eutectic solvents (DESs) as promising green drying agents were first proposed to natural gas (NG) dehydration. In this work, choline chloride (ChCl)-based DESs were prepared using ChCl as hydrogen bond acceptor (HBA) and triethylene glycol (TEG), ethylene glycol (EG) or Urea as hydrogen bond donors (HBDs). To explore the potential application, methane (CH 4 ) dehydration experiment was conducted to verify the dehydration performance using prepared DESs. The thermodynamic properties were predicted by COSMO-RS model (Conductor-like screening model for real solvents). The quantum chemistry calculation was applied to understand the separation mechanism at the molecular level. The absorption performance of H 2 O in DESs depends on the weak interaction between Cl atom (or N and O atom) of ChCl and H atom of H 2 O as well as the free volume of DESs. Molecular dynamics (MD) simulation discloses the intermolecular interaction between HBA and HBD. This work makes the first multi-scale analysis on NG dehydration using DESs.
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高影响因子
HIGH PERFORMANCE POLYMERS
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2022
·
IF 1.73
Rui Yang,Ming Yang Chen,Pei Li
Carbon molecular sieve (CMS) membranes have excellent gas separation property over conventional polymeric membranes and superior anti-swelling property. PMDA-ODA polyimide has high thermal stability and good mechanical property. It has been extensively adopted as the precursor of CMS membrane. However, due to the insoluble nature, PMDA-ODA CMS membranes are limited to configurations like dense symmetric films or composite membranes using porous inorganic or metal substrates. In this work, CMS hollow fiber composite membranes based on an asymmetric PMDA-ODA hollow fiber were successfully prepared for the first time. The neat PMDA-ODA hollow fiber membrane was crosslinked by polyethyleneimine to alleviate pore collapsing during carbonization and then dip-coated by a PMDA-ODA PAA solution to seal the surface defects. The PDMA-ODA CMS composite hollow fiber membranes showed gas permeances of 93.4 GPU, 19.6 GPU, 6.5 GPU, and 4.7 GPU for CO2, O2, N2, and CH4, respectively, with an ideal selectivity of 14.4, 3.0, and 19.8 for CO2/N2, O2/N2, and CO2/CH4 gas pairs, respectively. The attractive gas separation property shows a great potential for industrial application.
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高影响因子
ENERGY
·
2022
·
IF 8.857
Xiaoya Zang,Jing Wang,Yong He,Xuebing Zhou,Deqing Liang
Tetrabutylammonium bromide (TBAB) is a typical thermodynamic additive that can enhance the hydrate equilibrium temperature . Additionally, semi-clathrate hydrates formed from TBAB solutions exhibit reasonable CO 2 adsorption performance. In this study, TBAB hydrates were synthesized to determine their carbon capture capacity from a ternary gas mixture of CH 4 /CO 2 /N 2 (0.5/0.4/0.1). We measured the effect of temperature, pressure, and TBAB mass fractions (0.05–0.2) on the formation of gas hydrates, which were analyzed using Raman spectroscopy, powder X-ray diffraction (PXRD), and cryo-scanning electron microscopy (Cryo-SEM). With a 0.05 TBAB aqueous solution, the maximum recovery factor of CH 4 was 1.646 at 290.1 K and 7.0 MPa, whereas the maximum CO 2 split ratio was 0.454 at a pressure of 7.0 MPa and temperature of 280.1 K. Furthermore, the cryo-SEM images revealed that the addition of TBAB significantly increased the specific surface area of the hydrate crystals compared with the pure water system. PXRD and Raman spectroscopy showed that the hydrate structure transformed from a SI to a semi-clathrate hydrate. The hydrate samples formed from the 0.05 TBAB solution were found to be type A and B, leading to greater gas consumption. These results are expected to provide support for hydrate gas separation technology.
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