SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Zimei Zhang,Jing Wei,Min Deng,Lin Yang,Lu Yao,Wenju Jiang,Xuezhong He,Kaifang Wang,Jiali Tang,Bo Tang,Junfeng Zheng,Zhongde Dai
Mixed matrix membranes (MMMs) combine the desirable properties of polymers and inorganic fillers, yet interfacial incompatibility frequently results in non-selective voids that compromise selectivity. Here, we report a straightforward heat treatment (200–400 °C) to enhance interfacial compatibility in MMMs composed of 6FDA-DAM-AB-TFMB polyimide (PI) and two-dimensional zeolite (MFI) fillers. Incorporating porous zeolite fillers increases gas permeability, particularly for polar molecules such as CO 2 , while heat treatment induces crosslinking and polymer chain rearrangement, effectively eliminating non-selective voids and boosting selectivity. Moreover, partial carbonization during the thermal process generates a microporous structure that substantially increases overall gas permeability. Consequently, the MFI/PI-30 % membrane treated at 400 °C achieves exceptional CO 2 and H 2 permeabilities of 2220.8 Barrer (12.7 × higher) and 1767.2 Barrer (10.3 × higher), respectively, while retaining CO 2 /CH 4 and H 2 /CH 4 selectivity—surpassing the 2008 Robeson upper bound. The key innovation of this study is leveraging a moderate-temperature heat treatment that simultaneously mitigates interfacial incompatibility and creates micropores, thereby significantly enhancing both permeability and selectivity. This simple, scalable strategy holds great promise for the development of high-performance MMMs in advanced gas separation applications.
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高影响因子
Journal of Water Process Engineering
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2025
·
IF 6.7
Guangqian Kuang,Huijuan Cao,Xiangyong Zheng,Yishi Lin,Xingmin Jin,Min Zhao,Wenjuan Han
Antibiotics in wastewater present significant ecological risks. However, their effects on nitrogen (N) removal and greenhouse gas (GHG) emissions in constructed wetlands (CWs) have been largely neglected in previous studies. This study investigated the effects of antibiotics on N removal and GHG emissions in earthworm-enhanced CWs constructed with three earthworm densities (0 g m -2 , 156 g m -2 , and 312 g m -2 ). The results showed that (1) antibiotics significantly increased effluent total inorganic nitrogen (TIN) concentrations by 49.17 % in systems with the high-density earthworm, whereas no significant effects were observed in the other treatments; (2) in systems without earthworms, antibiotics significantly reduced N₂O emissions by 139 %. In systems with low-density earthworms, CH₄ and CO₂ emissions were significantly reduced by 366 % and 70.3 %, respectively. In contrast, in high-density earthworm systems, N₂O emissions significantly increased by 289 %; (3) antibiotics led to a significant reduction in non-CO₂ global warming potential (GWP non-CO₂ , -143 %) in the systems without earthworms and a reduction in total global warming potential (GWP CH₄+N₂O+CO₂ , -57.3 %) in the systems with low-density earthworms. However, both indices significantly increased by 289 % and 51.2 % in systems with high-density earthworms; (4) antibiotics altered the microbial community composition and significantly increased nitrite reductase activity in the systems with low-density earthworms (+24.5 %) but significantly decreased it in systems with high-density earthworms (-33.0 %). In summary, antibiotic contamination markedly influenced both N removal performance and GHG emissions in earthworm-enhanced CWs, with effects varying depending on earthworm density.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
·
IF 7.7
Xinjian He,Yuyan Zhuang,Danhong Gao,Hongwei Liu,Jintuo Zhu,Sheng Huang
Carbon monoxide is a colorless, odorless gas that can cause irreversible effects on the brain if inhaled in excess. Accurate measurement of carbon monoxide is very important for human health. The current carbon monoxide sensors work with long response time and narrow detection range. Therefore, in this work, TiO 2 was coated on perovskite nanocrystals Cs 3 Cu 2 I 5 by solution method to obtain high performance carbon monoxide gas sensitive material Cs 3 Cu 2 I 5 /TiO 2 nanocrystals. Moreover, high precision and anti-interference measurement of carbon monoxide was realized by combining with machine learning. The carbon monoxide sensor based on Cs 3 Cu 2 I 5 /TiO 2 has a short response/recovery time of 3.8/17.5 s and a sensitivity of 0.36 at 10 ppm. Then, an intelligent classification algorithm is used to quickly identify the concentration of carbon monoxide gas, and the recognition accuracy is as high as 99.5 %, which is higher than that of traditional sensitivity determination of gas concentration methods, due to the fact that machine learning involves multiple features of the electrical response curve, rather than the single feature of traditional sensitivity determination methods. Finally, the sensor was integrated into the self-rescuer for coal mine to realize the intelligent opening in the presence of CO, and improved the rescue efficiency. We believe that this sensor will be promising in the field of carbon monoxide, and the idea of using machine learning to intelligently recognize gas concentrations can be extended to other gas sensors.
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高影响因子
Geoenergy Science and Engineering
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2025
·
IF 4.6
Chenwei Zou,Yifei Liu,Caili Dai,Xiaoman Yuan,Huailong Wang,Yongping Huang,Zhongzheng Xu,Ning Yang
Gas flooding is crucial for enhanced oil recovery (EOR) in carbonate fractured-cavity reservoirs, but severe gas channeling reduces displacement efficiency. While foams can mitigate channeling via the Jamin effect, conventional and gel-strengthened foams often suffer from poor stability under high temperature, high salinity, and formation water dilution. This study presents a salt-induced dual network gel-strengthened foam (SDG-Foam) with improved gas-blocking performance and long-term stability. The SDG-Foam comprises a Ca 2+ -induced ion crosslinked network and a high temperature-initiated covalent crosslinked network. The optimized formulation includes sodium alginate (0.5–0.7 wt%), acrylamide (6.0 wt%), crosslinking agent (0.3 wt%), and initiator (0.004–0.006 wt%). Sodium alginate reacts with Ca 2+ in the formation brine to form the first crosslinked network, which can protect foam and gelant solution from being diluted by formation water. At high reservoir temperature, the monomer, crosslinking agent, and initiator eventually gelled, generating a second crosslinked network that prevented foam rupture and greatly increased foam stability. The half-life of SDG-Foam exceeded 18 days under high-temperature (130 °C) and salinity (220,000 mg/L) conditions. The fracture-cavity carbonate plate displacement experiment showed that the SDG-Foam achieved a strong gas channeling plugging, expanded the gas-swept volume, and improved the oil recovery by 11.5%. Visualization tests further revealed that SDG-Foam preferentially migrates to high-permeability channels, effectively sealing gas pathways and improving oil displacement efficiency.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Huasheng Wang,Shuang Deng,Hongyun Hu,Can Fang,Guangqian Luo,Ze Wang,Songgeng Li
Excessive ClO 2 tends to be produced and escape, causing secondary pollution when wet oxidation of NO with NaClO 2 is conducted under acidic conditions. NaClO 2 alkaline oxidation has accordingly received a wide attention. In this work, NaClO 2 alkaline oxidation of NO has been systematically studied in a self-built spray tower. Focus has been placed on the effects of acidic components contained in flue gas such as CO 2 , HCl and SO 2 . ClO 2 and HClO 2 are considered more effective for NO oxidation, which tend to be produced in an acidic environment. HCO 3 − has a relatively higher hydrolysis coefficient than ClO 2 − , leading to more HClO 2 formation. Similarity is found with HCl although the effect is not as significant as CO 2 due to its low concentration in flue gas. SO 2 exhibits a negative effect on NO removal since HClO 2 can be consumed by SO 2 . Nearly 100 % NO removal efficiency can be achieved although there is an initial time delay necessary for the neutralization of alkaline environment. A similar performance has been observed for HCl. On the contrary, SO 2 exhibits a negative effect on NO removal due to the competition with NO in the consumption of NaClO 2 . Additives such as NaClO and CTAC were also used to enhance NaClO 2 alkaline oxidation performance. Interesting to note that CTAC can nearly eliminate the time delay by intensifying the gas-liquid mass transfer.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2013
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IF 2.112
Fake Li,Hang Li,Hongmin Jiang,Kejun Zhang,Kai Chang,Shuangrong Jia,Wenbin Jiang,Ya Shang,Weiping Lu,Shaoli Deng,Ming Chen
Nano-scaled polypyrrole (PPy) particles have been successfully synthesized with the help of Triton X-100 micelles via soft template approach. The polypyrrole nanoparticles have been spin-coated on surface acoustic wave (SAW) transducers to demonstrate their sensing capability toward acetone gas exposure. Field Emission Scanning Electron Microscopes (FE-SEM) and Fourier transform infrared (FT-IR) spectroscopy have been utilized to characterize these PPy nanoparticles. The PPy nanoparticles have an average diameter of 95 nm. The responses of the sensors are linearly associated with the acetone concentrations in the range from 5.5 ppm to 80 ppm. In response to 5.5 ppm acetone exposure, the response and recovery time are 9 s and 8.3 s, respectively. SAW sensors coated with PPy nanoparticles were potentially useful to detect acetone.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
·
IF 8.4
Kai Sun,Guanghui Zhan,Lin Zhang,Zilin Wang,Shiwei Lin
Developments of advanced sensors for NO 2 gas with high sensitivity and selectivity are essential but challenging. In this work, a Ce-doped ZnO nanoarray (termed as CZO) was successfully constructed via a one-pot hydrothermal method , and further demonstrated as a promising NO 2 chemiresistive sensing material. It proves that Ce doping not only changes the morphology of the initial ZnO nanoarray, but brings abundant oxygen vacancy in particular, as comprehensively proofed by scanning electron microscopy, transmission electron microscopy , and electron spin resonance spectroscopy . Gas sensing tests at 250 °C reveal that CZO-2 (Ce wt% = 2 %) offers a 10-fold higher sensing response to NO 2 and much lower limit of detection (LOD = 1.4 ppb), compared to those of the initial ZnO nanoarray. Additionally, high selectivity for NO 2 and excellent long-term stability are also obtained in such a Ce-doped sensor. Density function theory calculation results show that ZnO modulated by oxygen vacancy has a much stronger affinity toward NO 2 than pure ZnO, thus resulting in the improved sensing performance observed in CZO-2.
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DOI
高影响因子
CHROMATOGRAPHIA
·
2021
·Vol. 84
·期 4
·325-333
·
IF 2.044
Shuai Xiaomin,Cai Zhiqiang,Zhao Xinyu,Chen Yujie,Zhang Qian,Ma Ziwei,Hu Junjie,Sun Tao,Hu Shaoqiang
In this work, a novel calix[4]resorcinarene-based ionic liquid (C4RA-2IL) was synthesized, structurally characterized, and statically coated on capillary column as stationary phase for capillary gas chromatography (GC). The column efficiency of the C4RA-2IL column is 3345 plates m −1 , which are determined by n -dodecane at 120 °C. Based on its McReynolds constants, the C4RA-2IL column showed moderate polarity. Particularly, the C4RA-2IL column show high separation performance for a wide range of analytes and some difficult separation of meta/para-isomers. Moreover, it exhibited excellent selectivity for critical aromatic isomers of chloroaniline, bromaniline, iodoaniline, toluidine and xylidine isomers and shows advantageous separation capability over the commercial polysiloxane stationary phase. This work presents a promising future of calixarene-based ionic liquid as a new type of stationary phase in GC separations.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Wenlong Zhang,Bin Yang,Jingquan Liu,Xiang Chen,Xiaolin Wang,Chunsheng Yang
In order to improve the sensitivity and reduce working temperature of tin oxide sensor, two elements of copper, zinc doped tin oxide gas sensor has been successfully synthesized using one-step hydrothermal method. During the preparation process, the common zinc acetate and cupric chloride were adopted as copper, zinc source, respectively. The morphology and structure of the as-prepared sample were further characterized using X-ray diffraction (XRD), energy dispersive spectrometry (EDS), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED), and ASAP 2460 (used for mesoporous distribution analysis). It’s found that octahedral nanoparticle enclosed by (221) high energy crystal facet had been prepared. The results also demonstrated that the as-prepared tin oxide doped by copper, zinc elements was single crystal structure of tetragonal system and the size of the crystalline grain was about 50 nm. During the gas sensing performance experiments, the sample’s gas-sensing properties have been proved to be greatly enhanced in sensitivity and working temperature. The response value to 50 ppm ethanol at 110 °C of the sample was increased to 210 that was almost 10 times higher than reported values. Besides, the optimal working temperature was decreased to be 110 °C from reported 350 °C.
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高影响因子
FUEL
·
2020
·
IF 5.578
Songjian Zhao,Wenjun Huang,Jiangkun Xie,Wei liu,Zan Qu,Naiqiang Yan
UiO-66-type metal-organic frameworks (MOF) grafted with organic functionalities (–Br, –NO 2 and –NH 2 ) are introduced to investigate the elemental mercury (Hg 0 ) removal from flue gas, and the effect for adding linkers on Hg 0 removal is discussed. Results indicated that added functional groups did not alter the original topology of adsorbents, although their size and morphology varied. Adding –NH 2 and –NO 2 functional groups was detrimental for the thermal stability of UiO-66 except for -Br functional group, and grafted -Br itself was also stable. The Hg 0 removal ability of UiO-66 was not significantly changed by grafting –NH 2 and –NO 2 . The grafted -Br was beneficial for Hg 0 capture, and the Hg 0 removal performance of UiO-66-Br increased with increasing oxygen content and temperature. Furthermore, the mechanism of Hg 0 capture was studied.
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2016
·
IF 5.393
Hailong Li,Lei Zhu,Jun Wang,Liqing Li,Kaimin Shih
The surface area of zinc sulfide (ZnS) was successfully enlarged using nanostructure particles synthesized by a liquid-phase precipitation method. The ZnS with the highest surface area (named Nano-ZnS) of 196.1 m2·g–1 was then used to remove gas-phase elemental mercury (Hg0) from simulated coal combustion fuel gas at relatively high temperatures (140 to 260 °C). The Nano-ZnS exhibited far greater Hg0 adsorption capacity than the conventional bulk ZnS sorbent due to the abundance of surface sulfur sites, which have a high binding affinity for Hg0. Hg0 was first physically adsorbed on the sorbent surface and then reacted with the adjacent surface sulfur to form the most stable mercury compound, HgS, which was confirmed by X-ray photoelectron spectroscopy analysis and a temperature-programmed desorption test. At the optimal temperature of 180 °C, the equilibrium Hg0 adsorption capacity of the Nano-ZnS (inlet Hg0 concentration of 65.0 μg·m–3) was greater than 497.84 μg·g–1. Compared with several commercial activated carbons used exclusively for gas-phase mercury removal, the Nano-ZnS was superior in both Hg0 adsorption capacity and adsorption rate. With this excellent Hg0 removal performance, noncarbon Nano-ZnS may prove to be an advantageous alternative to activated carbon for Hg0 removal in power plants equipped with particulate matter control devices, while also offering a means of reusing fly ash as a valuable resource, for example as a concrete additive.
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PubMed
高影响因子
Microsystems & Nanoengineering
·
2020
·Vol. 6
·期 1
·1-13
·
IF 5.048
Zhu Li-Yuan,Yuan Kai-Ping,Yang Jia-He,Hang Cheng-Zhou,Ma Hong-Ping,Ji Xin-Ming,Devi Anjana,Lu Hong-Liang,Zhang David Wei
Highly sensitive and selective hydrogen sulfide (H 2 S) sensors based on hierarchical highly ordered SnO 2 nanobowl branched ZnO nanowires (NWs) were synthesized via a sequential process combining hard template processing, atomic-layer deposition, and hydrothermal processing. The hierarchical sensing materials were prepared in situ on microelectromechanical systems, which are expected to achieve high-performance gas sensors with superior sensitivity, long-term stability and repeatability, as well as low power consumption. Specifically, the hierarchical nanobowl SnO 2 @ZnO NW sensor displayed a high sensitivity of 6.24, a fast response and recovery speed (i.e., 14 s and 39 s, respectively), and an excellent selectivity when detecting 1 ppm H 2 S at 250 °C, whose rate of resistance change (i.e., 5.24) is 2.6 times higher than that of the pristine SnO 2 nanobowl sensor. The improved sensing performance could be attributed to the increased specific surface area, the formation of heterojunctions and homojunctions, as well as the additional reaction between ZnO and H 2 S, which were confirmed by electrochemical characterization and band alignment analysis. Moreover, the well-structured hierarchical sensors maintained stable performance after a month, suggesting excellent stability and repeatability. In summary, such well-designed hierarchical highly ordered nanobowl SnO 2 @ZnO NW gas sensors demonstrate favorable potential for enhanced sensitive and selective H 2 S detection with long-term stability and repeatability.
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PubMed
高影响因子
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