SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Yang Cui,Jiayi Meng,Long Lv,Yongmei Chen,Tianyu Li
Electrodialysis utilizing monovalent selective cation exchange membranes have wide application prospects in waste acid recycling and lithium-ion extraction. While the multilayered modification of substrate membranes with polyelectrolytes is one of the effective ways to improve the monovalent selectivity of standard cation exchange membrane, the stability of such modified membranes is often poor owing to the detachment of the polyelectrolyte layers. This study proposes a novel strategy utilizing covalent bonding between the modification layers and the substrate. The approach involves doping poly (vinyl alcohol) (PVA) into a sulfonated polyphenyl sulfone (SPPSU) substrate, followed by the alternate deposition of polyethyleneimine (PEI) and poly (sodium 4-styrenesulfonate) (PSS) via the layer-by-layer (LBL) assembly method. Subsequently, glutaraldehyde (GA) was employed as a dual-functional crosslinker to achieve simultaneous crosslinking within the substrate and at the interface of substrate and modification layer. The optimized membrane, SPPSU@4PVA(PEI/PSS) 2.5 , exhibited a low surface resistance of 6.77 Ω·cm 2 , a high Na + /Mg 2+ selectivity over 13, and a Na + flux of 4.5 × 10 −8 mol·cm −2 ·s −1 . Most notably, the performance remained after 60 h of continuous electrodialysis operation. This dual-crosslinking strategy enhances both the selectivity and stability of polyelectrolyte-modified monovalent selective cation exchange membranes.
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Nano Energy
·
2017
·
IF 12.343
Cheng Luo,Nishuang Liu,Hang Zhang,Weijie Liu,Yang Yue,Siliang Wang,Jiangyu Rao,Congxing Yang,Jun Su,Xueliang Jiang,Yihua Gao
Pressure sensor with high sensitivity is desirable for it's vast application in fields like wearable electronics and human-machine interface. Here, we report a simple but rarely investigated approach to fabricate amazing high sensitivity pressure sensors by using PVA nanowires as spacer between active materials. On one hand, Polyvinyl Alcohol (PVA) nanowire (PVANW) serves as contact spacer between polypyrrole (PPy) film and PET/ITO sheet, where the electrical transportation between PPy film and PET/ITO sheet can be altered with different density of PVANW; on the other hand, the electroplating-obtained PPy film with intrinsic wrinkled and fluffy structure, shows various electrical conductivities under various external pressures. By virtue of these two traits, the PPy-PVANW-PET/ITO (PPPI) sensor distinguishes itself with superior performances of ultrahigh sensitivity (109.9 kPa −1 , 0–0.17 kPa; 228.5 kPa −1 , 0.5–2 kPa; 11.9 kPa −1 , 5–9 kPa), low detection limit (2.97 Pa) and good stability (10,000 loading-unloading cycles). The excellent advantages of the sensor make it a promising candidate in today's pressure sensor industry, and the fabrication procedure of PPPI sensor also provides a simple method to improve the performance of pressure sensors.
研究领域:
材料科学
·
传感器技术
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JOURNAL OF THE TEXTILE INSTITUTE
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2025
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IF 1.5
Zhiyuan Chen,Binjie Xin
During the wound healing process, the surrounding tissue fluid plays a crucial role. However, excessive exudate can lead to wound infection and over-hydration, thereby delaying the healing process. Therefore, developing a novel wound dressing that can unidirectionally remove excess biological fluids and effectively inhibit bacterial infection is particularly important. This study successfully utilized electrospinning technology to prepare a nanofiber dual-layer membrane with unidirectional water transport functionality. Its inner layer consists of polylactic acid (PLA) and zinc oxide (ZnO) nanofibers, providing excellent hydrophobic and antibacterial properties. The outer layer is composed of polyvinyl alcohol (PVA), chitosan (CS), and nanoscale zinc oxide (ZnO) nanofibers, offering outstanding hydrophilicity and liquid absorption capability. Experimental results demonstrate that this nanofiber dual-layer membrane exhibits outstanding physical, chemical, and biological properties, with a mechanical strength of up to 6.4 Mpa and breathability 17.47 mm/s and antibacterial property is outstanding. In practical applications, this dressing can effectively expel excess biological fluids within just 5 s, preventing wound over-hydration and providing an innovative and feasible solution for the effective treatment of chronic wounds.
研究领域:
生物材料
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组织工程
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纳米医学
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创伤修复
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感染控制
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2017
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IF 3.359
Qing Zhu,Yao Wang,Mufang Li,Ke Liu,Chunyan Hu,Kelu Yan,Gang Sun,Dong Wang
The heavy metal ions are harmful for both environment and human healthy, therefore it is highly demanded to remove them from environment. In this study, the crystalline nanocellulose (CNC)/ poly(vinyl alcohol-co-ethylene (PVA- co -PE) nanofibrous membrane functionalized with 1, 2, 3, 4 -butanetetracarboxylic acid (BTCA) was prepared to adsorb the heavy metal ions. To enhance the absorptivity, BTCA modified membrane was activated by NaHCO 3 . The structures of modified nanofibrous membranes were characterized by FESEM and FTIR. The modified membrane was then used to adsorb the Pb (II), and the mixture of Pb (II), Cr (VI), Mn (II) and Cu (II). The effect of pH value and initial concentration on the absorptivity of nanofibrous membrane to Pb (II) was studied and the adsorption kinetics was analysed. After NaHCO 3 activation, the modified nanofibrous membrane demonstrated excellent adsorption capacity to the single metal ions and metal ions mixture. The equilibrium adsorption could reach 471.55 mg·g −1 at 15 °C, higher than other nanofibrous membranes reported. Moreover, the modified nanofibrous membrane was found to be stable and could maintain 50% of the initial data after three times reuse. All of the results indicated the NaHCO 3 activated membrane was a good candidate for the heavy metal ions removal.
研究领域:
环境科学
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材料科学
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TRIBOLOGY LETTERS
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2021
·Vol. 69
·期 2
·1-10
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IF 3.106
Cui Lingling,Chen Junyue,Yan Chengqi,Xiong Dangsheng
On the purpose of improving the surface wettability and tribological properties of Ti6Al4V alloy for artificial joints, we designed a novel ‘soft (hydrogel layer)–hard (porous Ti6Al4V alloy substrate)’ structure, which was fabricated by laser texturing, surface dopamine modification and poly(vinyl alcohol) (PVA) hydrogel casting. Characterization results revealed that the PVA hydrogel layer could be attached to Ti6Al4V alloy successfully, and the LTi–DA–PVA specimen obtained a hydrophilic surface with a static water contact of 32°. It is worth noting that compared to the pristine Ti6Al4V alloy, the friction coefficient of the LTi–DA–PVA specimen could be as low as 0.01, which is similar to that of natural cartilage. This result was attributed to the synergistic effect of the high load-bearing capacity of the lower Ti6Al4V substrate and the good biphasic lubrication of the upper PVA hydrogel layer. In addition, the introduction of dopamine could significantly improve the interfacial bonding performance between the substrate and the hydrogel layer. This work provides an effective method for improving the surface wettability and tribological properties of Ti6Al4V as artificial joints.
研究领域:
材料科学
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生物医学工程
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摩擦学
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表面工程
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FOOD RESEARCH INTERNATIONAL
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2026
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IF 8.8
Tian Du,Qing-Ping Zheng,Ye-Ting Wang,Meng Li,Yan-Zhen Zheng
Green NADES extracted propolis bioactives integrated into PVA/ZIF-L films. • Leaf-like ZIF-L nanocarriers enhanced UV shielding and film flexibility. • PVAD/ZIF0.5 exhibited 70.2% DPPH scavenging and strong antibacterial activity. • Composite films effectively inhibited oyster spoilage during 10 d refrigeration. • Synergistic DES–ZIF-L system enabled safe and sustainable active packaging. Active packaging materials with integrated antioxidant and antimicrobial functions offer an effective strategy for extending the shelf life of highly perishable aquatic foods. In this study, a multifunctional composite film was fabricated by incorporating natural deep eutectic solvent (NADES)-extracted propolis bioactives and two-dimensional ZIF-L nanocarriers into a poly(vinyl alcohol) (PVA) matrix. The synthesized ZIF-L exhibited a characteristic leaf-like morphology with an average particle size of 140 nm, facilitating its uniform dispersion within the polymer network. Structural analyses confirmed that ZIF-L and propolis extracts were successfully integrated into the PVA matrix through hydrogen bonding and physical interactions. The resulting PVAD/ZIF composite films displayed enhanced flexibility and improved UV-shielding properties while maintaining good transparency. The optimized PVAD/ZIF0.5 film exhibited the highest antioxidant activity with a DPPH radical scavenging rate of 70.2%, and showed strong antimicrobial activity against Staphylococcus aureus and Escherichia coli . Application tests demonstrated that oysters packaged with PVAD/ZIF0.5 maintained TVB-N values below 30 mg/100 g and a TVC of 5.80 log CFU/g after 10 days of refrigerated storage, whereas control samples exceeded spoilage limits. Furthermore, the PVAD/ZIF0.5 retained good mechanical integrity under high-humidity conditions, while Zn 2+ migration remained well below the regulatory limit for food-contact materials. In addition, cytocompatibility assays showed high cell viability (96.28%) after 24 h incubation. These findings demonstrate that the PVAD/ZIF composite film is a promising biodegradable active packaging material for aquatic food preservation. Download: Download high-res image (113KB) Download: Download full-size image
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ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Fuyu Jiang,Peilin Liu,Yuhang Liu,Xi Chen,Jian Li,Yiyang Bi,Yuchun Wan,Wanqiang Liu
A hydrogen-bond-regulated PVA/CMC quasi-solid-state electrolyte with EG/H 2 O solvent was designed to realize antifreezing and dendrite-free aqueous Zn-ion batteries. • The synergistic polymer network and EG effectively reduced free-water activity, optimized Zn 2+ solvation, and enabled uniform Zn deposition. • COMSOL simulations and experimental analyses confirmed that the quasi-solid-state electrolyte homogenized the interfacial electric field and suppressed dendrite growth. • The Zn||Zn symmetric cell achieved a long cycling lifespan of 1100 h at room temperature and 1700 h at −30 °C. Aqueous zinc-ion batteries (AZIBs) have attracted extensive attention owing to their intrinsic safety, low cost, and environmental benignity. However, the practical application of AZIBs is severely hindered by the freezing of aqueous electrolytes at low temperatures and by uncontrolled Zn 2+ deposition, which induces dendrite growth. Herein, a freeze-resistant quasi-solid-state gel electrolyte is proposed, in which poly (vinyl alcohol) (PVA) and carboxymethyl cellulose (CMC) form a robust three-dimensional network via hydrogen bonding and chain entanglement. Ethylene glycol (EG) regulates the solvation environment by confining free water molecules, thereby depressing the freezing point and stabilizing the Zn 2+ solvation structure, enabling efficient ion transport at low temperatures. COMSOL Multiphysics (COMSOL) further confirms that the quasi-solid-state electrolyte effectively homogenizes the electric field distribution, suppresses dendrite growth, and mitigates interfacial corrosion. Benefiting from these synergistic effects, Zn||Zn symmetric batteries deliver a prolonged cycling lifespan of 1100 h at 1 mA cm –2 and 1 mAh cm –2 , which is 12 times longer than that of the ZnCl 2 electrolyte. Notably, an ultralong lifespan of 1700 h is achieved at -30 °C. Furthermore, the Zn||V 2 O 5 full cell exhibits outstanding cycling stability over 2000 cycles at 1 A g –1 . This work provides a promising strategy for designing antifreezing electrolytes and stabilizing Zn anodes for high-performance AZIBs under extreme conditions. Download: Download high-res image (278KB) Download: Download full-size image
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2026
·
IF 7.9
Shengkai Liu,Ruimeng Liu,Wenxuan Wang,Dandan Hu,Yu Han,Cong Li,Huiling Li,Chang Wan,Tai Peng,Wei Wang,Daxin Liang
A Hofmann-degraded HTO/CMC/PVA composite film solves powdered HTO’s solid-liquid separation issue via a dense cross-linked network. • Protonated primary amine groups boost lithium selectivity by nearly twofold through the Donnan exclusion effect. • Superior lithium adsorption in real samples, retaining 91.3% capacity after six adsorption-desorption cycles. Rapid global new energy development fuels explosive lithium demand, with efficient purification of salt lake brine and battery leachate a research hotspot. Liquid-phase lithium recovery is severely hindered by coexisting metal ions with ionic radii similar to lithium, leading to high system complexity. Although powdered H 2 TiO 3 (HTO) lithium ion sieves have inherent advantages of stable structure and excellent adsorption capacity, they face critical technical bottlenecks including low solid-liquid separation efficiency and easy co-adsorption by high-valence interfering ions. To solve these problems, this study modified polyacrylamide (PAM) through Hofmann degradation reaction to introduce primary amine groups, and further compounded modified PAM with carboxymethylcellulose (CMC) and polyvinyl alcohol (PVA) to prepare an HTO-loaded CMC/PVA/PAM composite adsorption film. The film forms a dense cross-linked network via intermolecular hydrogen bonds among the three polymers, fundamentally solving the solid-liquid separation issue of powdered HTO. In an alkaline adsorption environment (pH < 10.5), primary amine groups on modified PAM are protonated to form positive charge sites, which exert the Donnan exclusion effect through electrostatic repulsion to effectively inhibit co-adsorption of magnesium, cobalt, manganese and nickel ions, raising the lithium selective separation efficiency of HTO/CPP2 by nearly twofold compared with HTO/CP. The film showed outstanding specific adsorption performance in actual Da Qaidam Salt Lake water samples and waste battery residue leachate, with good cycling stability that retains 91.3% of the initial adsorption capacity after six cycles. This research thus provides a novel and feasible technical solution for the integrated green extraction of high-purity lithium from two typical complex lithium-containing systems. Download: Download high-res image (225KB) Download: Download full-size image
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JOURNAL OF CULTURAL HERITAGE
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2026
·
IF 3.7
Ting Zhao,Yan-Xia Di,Ping-Chuan Gao,Ying Wu,Yi Liu,Yuan Fang,Zhuo Wang,Jian-Feng Zhu,Wen-Zong Yang,Yi Qin
A PVA-PAA hydrogel encapsulates microemulsions for non-invasive mural smoke removal. • PVA:PAA 7:3 hydrogel has high strength (0.66 MPa, 700%) and 67% liquid retention. • This hydrogel restores mural shape and color, enabling non-destructive cleaning. As a significant heritage of human civilization, murals often develop hydrophobic smoke deposits on their surfaces due to the combustion of incense, candles, and Yak butter, posing a serious threat to their long-term preservation. Traditional cleaning methods fail to meet the stringent requirements of cultural relic conservation, particularly with regard to safety, controllability, and non-destructiveness, thereby highlighting the urgent need for a gentle, safe, and controllable cleaning strategy. To address this challenge, this study developed a polyvinyl alcohol-polyacrylic acid (PVA-PAA) double-network hydrogel loaded with an oil-in-water (O/W) microemulsion (composed of AEO-9, SDBS, n-pentanol, liquid paraffin, and water) via a solvent displacement method. The hydrogel forms a three-dimensional network through the synergistic interaction between PVA and PAA, achieving stable cross-linking primarily through hydrogen bonding. The influence of varying PVA:PAA mass ratios on hydrogel performance was systematically investigated. Results demonstrated that the hydrogel with a mass ratio of 7:3 exhibited optimal mechanical properties(the tensile stress is 0.66 MPa and the strain is 700%.), swelling capacity(110%), and liquid retention(the water retention rate is 67% after working at 60 degrees celsius for 4 h.). The cleaning evaluation demonstrates that following treatment with the system, the surface morphology, color difference, and contact angle of the simulated mural samples with smoke deposits mural closely resemble those of the original sample. This indicates that the system can gently penetrate the contamination layer, effectively promote the emulsification and dispersion of pollutants, and preserve the structural integrity of the underlying mural substrate. This research presents a novel, controllable, and non–destructive cleaning strategy for the removal of complex hydrophobic contaminants from cultural relic surfaces, offering strong potential for practical application.
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RADIATION PHYSICS AND CHEMISTRY
·
2026
·
IF 3.5
Zhengying Wang,Yuhong Liu,Yunshi Lei,Baoyue Qiu,Hao Chen,Xiaoyan Wei,Jiang Huang
Aqueous zinc-ion supercapacitors are regarded as promising energy storage devices due to their high safety, low cost and environmental friendliness. However, conventional preparation methods for dual-crosslinked hydrogel electrolytes typically require initiators or chemical crosslinking agents and involve complex processing procedures. These requirements not only increase production cost but may also introduce environmental concerns. To overcome these limitations, this study builds upon a novel electron beam (EB) irradiation strategy developed in our previous research and further extends its advantages. The core innovation of this study is the introduction of glycerol (G), which converts the EB irradiation–induced crosslinking mechanism from a predominantly physical network, as observed in single-component polyvinyl alcohol (PVA) hydrogels, into a synergistic covalent/physical dual network. This fundamental shift in network architecture underpins the observed performance enhancements. Herein, we report a dual-crosslinked PVA–G hydrogel electrolyte fabricated via EB irradiation without any chemical crosslinking agents or initiators. The results demonstrate that an optimal irradiation dose of 30 kGy yields a PVA–G hydrogel with excellent overall performance, including a maximum tensile strength of 71 kPa and an elongation at break of 104.61%. Notably, compared with our previous study (in which PVA hydrogel at 30 kGy exhibited a maximum tensile strength of 78 kPa and an elongation at break of approximately 7.63%), the elongation at break of the PVA–G dual-crosslinked hydrogel is drastically increased, confirming its substantially improved mechanical properties. Furthermore, the hydrogel exhibits a high ionic conductivity of 22.8 mS cm -1 and an expanded electrochemical stability window of approximately 2.51 V. This study presents a cost-effective, simple and scalable strategy for producing high-performance dual-crosslinked hydrogel electrolytes and further demonstrates the versatility and superiority of EB irradiation technology for advancing aqueous energy storage materials.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Qiaozhang She,Zhendong Hu,Qixi Zheng,Fanghui Lei,Yuxin Wu
The limited compatibility between lignin and hydrophilic polysaccharide–polymer matrices restricts the development of high-performance bio-based packaging films. Here, we propose a green strategy that incorporates solvent-fractionated alkaline lignin (F-AL) into konjac glucomannan (KGM)/polyvinyl alcohol (PVA) films through citric acid (CA)-mediated ester crosslinking. Fractionation using acetone/water enriched phenolic hydroxyl groups and reduced molecular weight, thereby enhancing lignin reactivity toward CA and improving its dispersion in the PVA/KGM matrix. FTIR and SEM analyses confirmed the formation of a denser crosslinked network and markedly improved interfacial compatibility. As a result, the optimized PKFAL6 film exhibited high tensile strength (40.27 MPa), a 54.8% reduction in water vapor permeability, and a low swelling ratio (112.47%). The enriched phenolic structure of F-AL imparted strong antioxidant activity (up to 85.6% DPPH scavenging) and excellent UV-blocking ability (91.4% UVB; 58.9% UVA). Soil-burial tests revealed a two-stage degradation behavior, with slower early-stage mass loss due to antimicrobial effects and accelerated degradation after network cleavage. These results demonstrate that lignin fractionation is an effective strategy for creating sustainable films with enhanced soil degradation performance and improved functional properties for active packaging.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Chao Wang,Hongyuan Du,Luming Jin,Chaoyang Chen,Liang Bu,Ya Cheng,Wendong Zhu
Multi-level physical crosslinks build a hierarchical energy dissipation system. • Synergy of PVA domains and dynamic weak bonds balances strength and toughness. • PSGGZ hydrogel reaches 2.13 MPa stress, 539.75% strain, and 574.22 kJ/m 3 toughness. • It exhibits high gauge factor (8.09) and fast responsiveness (38.3 ms) for sensing. Hydrogels represent an important class of intelligent soft materials with wide applications in tissue engineering, flexible sensors, and drug delivery systems. However, their practical deployment has long been severely constrained by the inherent trade-off among mechanical strength, toughness, and ionic conductivity. Herein, a hierarchical energy dissipation system is chosen to construct a hierarchical multi-level physical crosslinking network hydrogel that simultaneously breaks the above performance trade-off. The robust semi-crystalline domains of polyvinyl alcohol (PVA) serve as a rigid backbone to endow the hydrogel with high mechanical strength, while reversible weak interactions including zirconium-oxygen coordination clusters, borate ester bonds, and hydrogen bonds act as sacrificial bonds to dissipate energy efficiently, thus achieving excellent toughness. The stress, strain, elastic modulus and toughness of the optimal hydrogel reach 2.13 MPa, 539.75%, 0.20 MPa, and 5.742 MJ/m 3 , respectively. Simultaneously, the hydrated polymer network enables rapid dissociation and migration of mobile ions, giving the hydrogel prominent strain-responsive conductivity required for sensing applications. The ionic conductivity reaches 2.74 S/m, and the gauge factor is calculated to be 3.79 and 8.09 in the strain ranges of 0–155% and 155%–528%, respectively. Benefiting from the fast dynamic reversibility of the physical network, the response and recovery times are as short as 38.3 ms and 21.9 ms, respectively, endowing the hydrogel with outstanding strain sensing and human motion monitoring capabilities. This work provides a universal design strategy to overcome the mechanical bottleneck of PVA-based hydrogels, paving the way for advanced wearable sensor applications. Download: Download high-res image (246KB) Download: Download full-size image
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危险品化学品经营许可证（带存储）