POLYMER
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2025
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IF 4.5
Pengkai Qin,Linbo Wu,Suyun Jie
Two series of high molecular weight aliphatic-aromatic random copolyesters: PBXT, where X represents the carbon atom number of the aliphatic α,ω -diacids, PBXT 48 and PBXT 50w (X = 4–14, even), with molar and mass copolymer compositions (48 mol% and 50 wt%) equal to those of commercial poly(butylene adipate-co-terephthalate) (PBAT) were synthesized from butanediol, terephthalic acid and various aliphatic α , ω -diacids. They were characterized with 1 H NMR, and their melt crystallization, optical, mechanical and gas barrier properties were assessed. In these copolyesters, the melt crystallization of butylene terephthalate (BT) sequence is dominant, while the butylene adipate (BX) sequences can also crystallize from melt when the BX content is high enough, the chain length of α , ω -diacid unit or the crystallization time is long enough. Long enough chain length of α , ω -diacid unit ( X ≥ 6) endows PBXT with sufficient chain flexibility/mobility and, therefore, excellent melt crystallizability at rapid cooling. For PBXTs with X ≥ 6, the effect of X on BT crystallization is not monotonic. In particular, both PB6T and PB12T displayed a higher melt crystallization temperature than the adjacent PBXTs. Compared to PB6T, PB4T has higher transparency and gas barrier properties; with increasing X from 6 to 14, the PBXTs show increased transparency and water vapor barrier, but decreased oxygen barrier performance. The tensile modulus and strength of PBXT decrease, and the elongation at break increases with increasing X . But the effect of X is clearly weakened for PBXTs with the same mass composition of 50 wt%.
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Desalination and Water Treatment
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2025
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IF 1
Yuansheng Tang,Wentian Zheng,Wei Bi,Guangxing Yang,Zibo Wang,Fengmi Zeng,Xianhui Li
Liquid-liquid membrane contactors (LLMC) and Gas-liquid membrane contactors (GLMC) have emerged as promising candidates for energy-efficient ammonia recovery, leveraging their unique interfacial transport characteristics and superior thermal/chemical stability. However, critical knowledge gaps persist in their mass transfer resistance and operational parameter sensitivity during ammonia absorption. This study conducts a systematic comparative analysis of LLMC and GLMC systems through integrated mass transfer modeling and experimental validation under equivalent operating conditions. Results showed that higher pH value was beneficial to the increase of ammonia absorption rate and the reduction of ammonia mass transfer in the LLMC system, whereas the GLMC showed stronger dependence on the feed flow velocity. The long-term stability testing demonstrated that the LLMC was more suitable for the treatment of wastewater with higher ammonia concentration, whereas the GLMC had an advantage for treating wastewater with lower ammonia concentration particularly under the intermittent operation. This work provides guidance in selection criteria for membrane contactor implementation, advancing the development of precise-controlled ammonia recovery systems in wastewater treatment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Li Wan,Xiang-Long Ding,Bo Liu,Yue-Fei Zhang,Jin-Rong Zhong,Yi-Min Dai
This study investigated anionic guar gum derivatives as dual-purpose inhibitors for methane hydrate formation and metal corrosion in oil and gas pipelines. Sulfonated guar gum (SHG), phosphorylated guar gum (PGG), and guar gum grafted acrylamide (GG-g-PAM) were synthesized and evaluated for their kinetic hydrate inhibition and corrosion inhibition properties. The results demonstrated that all anionic guar gums exhibited superior inhibition effects compared to native guar gum and polyvinylpyrrolidone (PVP), with GG-g-PAM achieving the highest maximum subcooling of 10.47 °C at the concentration of 0.5 wt%. SHG showed the most pronounced effect during the hydrate growth stage, and exhibited the best corrosion inhibition efficiency as well, with a significant inhibition efficiency (>92 %) at 0.5 wt%, surpassing other additives and a commercial imidazoline inhibitor. The formation of a protective film on carbon steel, enhanced by anionic groups, was confirmed through increased contact angles and reduced corrosion rates. Electrochemical impedance spectroscopy (EIS), polarization curves and SEM-EDX spectra further substantiated the effectiveness of the anionic guar gums in preventing carbon steel corrosion in CO 2 -saturated environments. The findings underscore the potential of anionic guar gum, particularly SHG, as a sustainable and effective bio-based additive for simultaneous hydrate inhibition and corrosion protection in oil and gas pipelines.
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PubMed
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Surfaces and Interfaces
·
2025
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IF 6.3
Chunsheng Liu,Wenjuan Chen,Siqi Lan,Yali Wang,Qunyan Li,Qi Wei,Zuoren Nie
Developing advanced materials for CO 2 adsorption is of great significance to reduce global warming caused by the continuous increase in CO₂ emissions. In the present work, hierarchical porous cellulose aerogels were prepared via the sol-gel and freeze-drying techniques using low-cost cellulose powder. The morphology, pore structure, phase, surface chemical composition, and adsorption performance for pure CO 2 and CO 2 in the simulated cement plant flue gas were investigated in detail. The results show that the obtained cellulose aerogels possess a high specific surface area, ranging from 62.45 to 124.9 m²/g, and exhibit a hierarchical porous structure. The samples with a cellulose powder concentration of 6wt% and undergoing the freeze-thaw process (denoted as 6CAF) demonstrates a maximum static adsorption capacity of 2.5 mmol/g at 25°C for pure CO 2 , and a breakthrough capacity of 3.5 mmol/g for the CO 2 in the simulated cement plant flue gas at 25°C. Upon the cycling adsorption, the 6CAF cellulose aerogels manifest desirable reusability except for the first cycle, where the residual sodium hydroxide from the preparation process plays a critical role in the CO 2 adsorption, leading to a chemical adsorption of CO 2 . The physical adsorption of CO 2 dominates in the subsequent cycles. This work provides a low-cost alternative for CO 2 adsorption, especially for that in the simulated cement plant flue gas.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2025
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IF 4.6
Jingzhao Tian,Zhihua Zhao,Jiazhi Li,Wenqiang Qiao,Chengyu Jin
Ammonia (NH 3 ), with its characteristic pungent odor, serves as a key indicator of meat spoilage, necessitating reliable detection methods for the precise assessment of meat freshness. However, the practical application of existing NH 3 sensors is limited by bottlenecks such as insufficient selectivity, relatively low sensitivity, and high operating temperatures. This study successfully fabricated high-performance NH 3 gas sensors using La 2 Sn 2 O 7 nanoparticles prepared via a facile one-step hydrothermal synthesis method. Gas-sensing performance tests revealed that the sensor exhibits a significant response value of 4.52 towards 100 ppm NH 3 at room temperature, a low detection limit down to 1 ppm. Furthermore, the sensor demonstrated superior selectivity for NH 3 compared to common interfering gases, outstanding long-term stability, and high repeatability. The research combined microstructural characterization and electrical property analysis to deeply elucidate its gas-sensing mechanism. Finally, an NH 3 detection alarm prototype device integrated with the La 2 Sn 2 O 7 sensor was designed and validated. This device effectively identified the spoilage status of chicken, beef, and lamb. Experimental results confirmed that the sensor can reliably determine the initial stage of meat spoilage by capturing trace amounts of NH 3 released at the onset of decay. This study provides a promising room-temperature operable sensor solution for practical meat quality monitoring.
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SURFACE & COATINGS TECHNOLOGY
·
2026
·
IF 6.9
Hui Guo,Yinzhong Liu,Yun Guo,Lingchao Wang,Xiaofan Li,Xiaotao Zhu,Yiyu Qiao,Yuqing Tian,Xuechun Yang
Eu/Er co-doped MOF-ZnO sensor enables room-temperature n-butanol detection. • 13.88-fold enhancement over ZnO (555/40) and LOD 862.6 ppb • Response/recovery: 33/27 s; good selectivity & stability • DFT: oxygen vacancies, surface area, band structure, adsorption energy The rapid advancement of industrialization has led to the emission of a growing number of volatile organic compounds (VOCs) into the atmosphere, posing significant threats to human health and the environment. Among these, n-butanol is recognized as a particularly harmful VOC. Herein, we propose a MOF-ZnO-based gas sensor for n-butanol doped with rare earth elements (Eu, Er), synthesized via a homogeneous co-precipitation method. The as-prepared samples were comprehensively characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) analysis, and ultraviolet-visible (UV–vis) spectroscopy to evaluate their morphological, structural, and physicochemical properties. Compared with the pure MOF-ZnO and the doped MOF-ZnO individually with 0.08 wt% Eu and 0.06 wt% Er, respectively, the co-doped MOF-ZnO with 0.04 wt% Eu 0.03 wt% Er presented the highest oxygen vacancy concentration and the largest specific surface area, as well as the optimal response, selectivity, and long-term stability toward n-butanol. Notably, at room temperature, the co-doped ZnO sensor achieved the highest response value of 555 toward 100 ppm n-butanol, representing a 13.88-fold enhancement over pure MOF-ZnO (40), with a limit of detection (LOD) as low as 862.6 ppb. The sensor also displayed fast response and recovery times of 33 s and 27 s, respectively, for n-butanol detection. Furthermore, the modified energy band structure and surface adsorption energy (E ads ) of the doped product were investigated via Density Functional Theory (DFT) mechanistic calculations. These findings offer a versatile and highly promising strategy for constructing high-performance VOC sensors.
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MATERIALS CHEMISTRY AND PHYSICS
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2018
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IF 2.21
Long Mao,Hui-qing Wu,Yue-jun Liu,Jin Yao,Yong-kang Bai
Inspired by versatile adhesive ability of mussel adhesion proteins, tannic acid-Fe(III) functionalized high aspect ratio layered double hydroxides (LDHs@TA-Fe(III)) was firstly prepared via a facile and fast deposition of one-step assembled TA-Fe(III) coatings on the surface of layered clay. LDHs@TA-Fe(III)/poly (ε-caprolactone) (PCL) nanocomposites were prepared by blending LDH@TA-Fe(III) and pure PCL via solution casting method to obtain homogeneous films. The results of thermal analysis confirm that LDHs@TA-Fe(III) can act as a nucleating agent . It is revealed that the inclusion of LDHs@TA-Fe(III) up to an appropriate level of content resulted in a remarkable enhancement in the mechanical and gas barrier properties . However, excess LDHs@TA-Fe(III) loadings give rise to a decrease in the mechanical properties. With incorporation of only 1 wt % LDHs@TA-Fe(III), a 47% increase in elongation at break and 21% reduction in the oxygen relative permeability are achieved. The reinforcement effect brought by LDHs@TA-Fe(III) is fairly noteworthy at low clay loadings potentially owing to the strong interfacial interactions between the clay and matrix.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Na Li,Xuankai Huang,Haiyan Zhang
Faradaic transition-metal-oxide/hydroxide (TMH) materials are critical for high-performance supercapacitors . However, the preparation of transparent micro-structured TMH electrodes is a great challenge and has become the bottleneck restricting the performance of transparent flexible supercapacitors . Here, Ni(OH) 2 nanosheets and amorphous FeOOH nanowires were simply synthesized as micro-structured transparent films through a scalable gas-liquid diffusion method at the air-solution interface. The microstructures are enwrapped in graphene shells (Ni@Gr-TF and Fe@Gr-TF) for increasing rapid 3D electron/ion transport pathways, alleviating the exfoliation and dissolution of active materials into the electrolyte, and extending the potential window of the FeOOH cathode to −1.25–0 V. An asymmetric transparent and flexible supercapacitor (ATFS) based on Ni@Gr-TF//Fe@Gr-TF exhibited a transmittance of 52.3% at 550 nm, a high specific capacity of 17.42 mF cm −2 at 0.2 mA cm −2 (one order higher than the maximum value reported for a transparent graphene membrane), an energy density of 0.67 mWh cm −3 based on the entire device (comparable with nontransparent devices) as well as a high capacity retention (85.1%) after a long cycle life of 20 000 cycles.
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JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Yitong Wang,Yanhua Tian,Jingde Li,Liping Zhao,Yanqin Yang
Mixed matrix membranes (MMMs) composed of polymers and metal-organic frameworks (MOFs) can effectively break the trade-off between selectivity and permeability of pure polymer membranes, thus holding great potential for the development of high-efficiency gas separation membranes. Nevertheless, structural mismatches between polymer matrix and MOF particles easily cause interfacial defects and filler aggregation, which severely hinder efficient gas separation. In this work, a novel interfacial bonding strategy is proposed. Specifically, an amidoxime-modified polymer of intrinsic microporosity (AOPIM-1) with similar structure to polymer matrix (PIM-1) is firstly used to modify and encapsulate the zeolitic imidazolate framework-8 (ZIF-8), generating a composite filler AO@ZIF. Within the resultant MMMs, due to the Zn-N coordination bonds and hydrogen bonds between ZIF-8/AOPIM-1 and PIM-1/AOPIM-1, respectively, low-defect interfaces are obtained. The optimized interfacial compatibility further achieves efficient CO 2 /N 2 separation performance. Particularly, when the filler loading is 2.5 wt%, the CO 2 /N 2 selectivity of the AO@ZIF-2.5/PIM-1 membrane increases by 72.8% and 46.0% compared with pristine PIM-1 and ZIF-2.5/PIM-1 membrane, exceeding the 2008 Robeson upper bound and approaching the 2019 Robeson upper bound. Moreover, the resultant membranes also possess outstanding mechanical properties, anti-plasticization capacity, and excellent anti-physical aging stability. This study provides a feasible strategy for interfacial design and performance optimization of high-performance MOF/polymer MMMs toward advanced gas separation.
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JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Xiang Li,Tianjia Chen
Efficient hydrogen separation at intermediate temperatures is important for membrane-assisted water–gas shift and reforming processes. Herein, a metal–polymer dual-phase mixed proton–electron conducting membrane was developed by capillary infiltration of OPBI into a porous titanium support, followed by phosphoric acid doping. In this structure, the Ti framework provides a continuous electron-conducting pathway, while PA-doped OPBI forms a dense proton-conducting phase. Pt layers promote H 2 dissociation and recombination, enabling selective hydrogen transport through coupled proton–electron conduction. The optimized Ti-PA/OPBI-Pt membrane, which has a thickness of 0.5 mm and a Ti pore size of 10 μm, achieved an H 2 flux of 0.96 mL min −1 ·cm −2 at 300 °C under a 50% H 2 /N 2 feed, with 100% H 2 /N 2 selectivity. Arrhenius analysis indicated different rate-controlling regimes below and above 200 °C. The membrane also maintained a stable H 2 flux of ∼0.63 mL min −1 ·cm −2 for over 200 h at 220 °C. This work provides a feasible metal–polymer mixed-conducting membrane strategy for hydrogen separation in the water–gas shift temperature window.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Jinrong Chuan,Shengzhi Duan,Yumei Li,Linping Liu,Jiyun Gao,Chenhui Liu
Microwave-assisted molten salt etching enables rapid, green preparation of Ti 3 C 2 T x from Ti 3 AlC 2 in 15 min. • In situ sulfidation achieves one-step construction of SnS 2 /Ti 3 C 2 T x heterojunctions. • SnS 2 /Ti 3 C 2 T x shows a 472% NO 2 response at room temperature, with 39.73 ppb LOD and good stability. • DFT calculations reveal band regulation at heterojunctions, enhancing NO 2 adsorption via p-type channels. MXenes have attracted attention in room-temperature gas sensing due to their high conductivity and tunable surface groups. However, conventional preparation often relies on fluoride-containing etching and stepwise processes, which are not only cumbersome but also hazardous. Herein, a microwave-assisted Lewis acidic molten salt etching strategy was developed to efficiently etch Ti 3 AlC 2 within 15 min, accompanied by the simultaneous in situ growth of Sn nanoparticles on Ti 3 C 2 T x . Subsequent in situ sulfidation formed SnS 2 /Ti 3 C 2 T x heterojunctions. The material exhibits outstanding NO 2 -sensing performance at room temperature: a response of 472% toward 100 ppm NO 2 , together with excellent selectivity, long-term stability, and a low limit of detection (LOD) of 39.73 ppb. The enhancement is ascribed to the SnS 2 /Ti 3 C 2 T x heterointerfaces and abundant adsorption sites derived from the enlarged specific surface area. DFT calculations reveal that band modulation induced by work function differences creates p-type conductive channels, clarifying the sensing mechanism. This study offers a green, rapid fabrication approach for high-performance room-temperature gas sensors. Download: Download high-res image (206KB) Download: Download full-size image
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FOOD CHEMISTRY
·
2026
·
IF 10.4
Liyu Hou,Haodong Wang,Lan Sun,Xinyuan Wang,Zhongping Huang,Huijun Liu,Jing Yu
4.71–5.19 μg/box and 1.27–1.40 μg/box were detected for the migrated PS MPs and NPs. • Hydrophilic iron oxide nanoparticle was used to capture polystyrene nanoplastics. • Adsorption mechanism includes hydrogen bonding, coordination, electrostatic interaction. • Quantification of PS MPs and PS NPs from lunch boxes by Py-GC/MS. • The aging effect causing the decomposition of PS MPs into PS NPs. In this study, 1 μm glass fiber membranes were used to enrich polystyrene microplastics (PS MPs), and then hydrophilic iron oxide nanoparticle (n-Fe 3 O 4 ) was used to capture the residual polystyrene nanoplastics (PS NPs), primarily through hydrogen bonding, coordination, and electrostatic interactions. MPs on membranes and NPs captured by n-Fe 3 O 4 were respectively determined by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The method was verified by adding PS MNPs standard to ultrapure water. The detection limit of this method was 0.16 μg/cup for PS MPs and 0.03 μg/cup for PS NPs. The absolute recovery rates of MPs and NPs were 99 ± 2% and 89 ± 3%, respectively. The test results of three batches of PS lunch boxes showed that the content of PS MPs attached on surfaces was 6.79–12.30 μg/box, and the content of PS NPs was 0.51–0.96 μg/box. The migrated PS MPs and PS NPs were 4.71–5.19 μg/box and 1.27–1.40 μg/box respectively.
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