Journal of Water Process Engineering
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2025
·
IF 6.7
Chen Zhao,Yiheng Wang,Nianping Wang,Ruilin Chen,Rui Yin,Xiangxi Li
The in-situ growth of ZnO is often used to modify membrane surface for enhanced hydrophilic and antibacterial properties due to significant modification effect, simple process and low cost. Nonetheless, some polymer membranes (such as PVDF membrane) lack active sites for ZnO growth on their surfaces, resulting in a small number of particles and unstable binding. This study utilized PDA/PEI to modify PVDF membranes for adequate active sites to capture Zn 2+ ions via the chelation action. Thereafter, nano ZnO can be synthesized easily via the alkalization reaction and thermal breakdown of Zn 2+ . Upon improving the modification conditions, ZnO particles were evenly distributed on the PVDF membrane's surface, leading to a reduction in membrane pore size from 0.38 nm to 0.29 nm. The water contact angle of the ZnO/PDA-PEI modified membrane dropped from 130° to 19°, indicating a significant enhancement in hydrophilicity. The modified membrane demonstrated enhanced anti-fouling performance in the oil/water separation experiment, achieving a steady permeance of 298 L·m −2 ·h −1 ·bar −1 , which was sixfold that of the original membrane. In the antibacterial experiment, the modified membrane exhibited significant antibacterial efficacy against both E. coli and S. aureus .
研究领域:
材料科学
·
环境工程
·
生物学
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DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 11
·1486
·
IF 4.9
Tingwei Mei,Mingtao Zhu,Hongjian Zhang,Yong Zhang
In recent years, dielectric films with a high energy-storage capacity have attracted significant attention due to their wide applications in the fields of renewable energy, electronic devices, and power systems. Their fundamental principle relies on the polarization and depolarization processes of dielectric materials under external electric fields to store and release electrical energy, featuring a high power density and high charge–discharge efficiency. In this study, sodium bismuth titanate (NBT) micro-flakes synthesized via a molten salt method were treated with hydrogen peroxide and subsequently blended with a polyvinylidene fluoride (PVDF) matrix. An oriented tape-casting process was utilized to fabricate a dielectric thin film with enhanced energy storage capacity under a weakened electric field. Experimental results demonstrated that the introduction of modified NBT micro-flakes facilitated the interfacial interactions between the ceramic fillers and polymer matrix. Additionally, chemical interactions between surface hydroxyl groups and fluorine atoms within PVDF promoted the phase transition from the α to the β phase. Consequently, the energy storage density of PVDF-NBT composite increased from 2.8 J cm−3to 6.1 J cm−3, representing a 110% enhancement. This design strategy provides novel insights for material innovation and interfacial engineering, showcasing promising potential for next-generation power systems.
研究领域:
能源材料
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高分子材料
·
电子器件
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电力系统
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DOI
PubMed
高影响因子
Applied Nanoscience
·
2019
·Vol. 9
·期 8
·1991-2000
·
IF 3.198
Liu Zhi,Cao Rui,Wei Anfang,Zhao Jianghui,He Jihuan
Membrane fouling and poor flexibility plague membrane technology for further application in water treatment. Herein, we introduce a hierarchical superflexible/superhydrophilic poly (vinylidene fluoride-co-hexa-fluoropropylene) (PVDF-HFP)/CuO-nanosheet membrane, which is capable of separating Polystyrene (PS) microspheres (diameter large than 300 nm) with high separation efficiency (higher than 99.89%). Moreover, the resulting membrane maintained 98.10% water flux after 60 min, suggesting excellent anti-fouling property. The anti-fouling property is contributed by the membrane superhydrophilicity, a result of the extreme roughness of CuO-nanosheet and the hydrophilic nature of CuO. Furthermore, the membrane processes outstanding flexibility due to the PVDF-HFP nanofiber backbone, which widens its applicability in practical industrial employment. Therefore, such a membrane with anti-fouling, high separation efficiency, super flexibility, as well as acceptable water flux (2360 ± 50 Lm − 2 h − 1 , 0.3 bar) and good mechanical properties (stress at break 6.65 MPa and elongation at break 67.35%), makes the membrane a good candidate for practical water microfiltration.
研究领域:
材料科学
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环境工程
·
水资源处理
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hongxing Wang,Yongping Hao,Chengbo Ru
Traditional power supply systems based on batteries, as ineffective payloads, significantly hinder the development of ignition systems. To eliminate the dependence on batteries, we developed a self-powered ignition system utilizing a piezoelectric nanogenerator (PENG) based on ZnO-doped polyvinylidene fluoride (PVDF) nanofibers with high β-phase content. When subjected to external mechanical stimulation, the output voltage of the PENG reaches 32 V, which can charge a 22 μF capacitor to 15 V within 200 s and then simultaneously light up five LEDs. A self-powered ignition circuit composed of subsystems for power harvesting, storage, and discharge is assembled to activate igniters such as Ni-Cr wire, Ni-Cr film, standard semiconductor bridge (SCB), high-resistance SCB and small-sized SCB. The energy conversion processes of the igniters, whether via electric explosion or electrothermal manner, complete within 2 μs to 0.5 ms and then successfully ignite nanothermites of Al/CuO, primary explosives of lead styphnate, or mixtures of potassium chlorate and lead thiocyanate. Subsequently, a pressed B/KNO 3 (BPN) pellet, either in contact with or separate from the igniter by up to 3.3 mm, can be successfully ignited, fulfilling the ignition and transmission functions of ignition trains. These results demonstrate that the self-powered ignition system can work reliably without batteries, which is conducive to the miniaturization and intelligence of initiators and pyrotechnic devices.
研究领域:
材料科学
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能源工程
·
纳米技术
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DOI
高影响因子
FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 3
·489-497
·
IF 1.797
Liu Ya,Wang Xueming,Li Nana,Wang Xiaoyin,Shi Lei,Wu Enjie,Wang Rui,Shan Mingjing,Zhuang Xupin
Nanofiber mats have received considerable attention from researchers in the field of particulate protection. In this study, polyvinylidene fluoride (PVDF) nanofiber mats were prepared on a large scale by a solution blowing process, and then crosslinked by ultraviolet (UV)-radiation using trimethylolpropane tri-acrylate (TMPTA) as a crosslinker. The structure, morphology, mechanical and thermal properties, and protective performance of the nanofiber mats were evaluated. Results show that the addition of TMPTA and UV treatment decreased the diameter of the nanofibers and enhanced the mechanical properties, air permeability, and moisture permeability. Nanofiber mats show higher filtration and lower filtration resistance compared with a commercial product. Furthermore, the nanofiber mats were bonded with Nylon 6 fabric, which showed good performance as a novel functional layer in protective clothing.
研究领域:
材料科学
·
纺织工程
·
防护材料
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产品关联
DOI
高影响因子
Membranes
·
2024
·Vol. 14
·期 11
·241
·
IF 3.3
Wenbin Sun,Longbo Xia,Ping Luo,Dong Zou
Polyvinylidene fluoride (PVDF) membranes are extensively utilized in membrane distillation (MD) for water treatment. However, traditional methods easily form asymmetrical membranes with dense skin layers that are detrimental to membrane flux. Herein, an eco-friendly PVDF membrane was fabricated by utilizing a delayed phase separation process without using any pore-forming agents. In addition, methyl-5-(dimethylamino)-2-methyl-5-oxopentanoate (PolarClean) was used as a green solvent without posing risks to humans and the environment. It was demonstrated that the PVDF concentration is crucial in influencing the microstructures and performance of the resulting membranes. As the PVDF concentration increased, the morphology changed significantly, resulting in a reduction of pore size. When feeding the device with NaCl solution at a concentration of 35 g/L, the MD water vapor flux reached 18.49 kg·m −2 ·h −1 , while maintaining a salt rejection of over 99.97% during the continuous operation for 24 h. This work presented a method for producing green PVDF membranes via delayed phase inversion with satisfactory water vapor flux and salt rejection, highlighting their prospect for effective applications in MD for water treatment.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
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2021
·
IF 5.485
Zixin Wu,Jiaying Tian,Lili Wu,Chaocan Zhang
Membrane technology plays an important role in wastewater separation and purification. However, the problem of poor hydrophobicity of the membrane is a serious obstacle to its application. With anti-cancer, prevention and control of cardiovascular diseases and other effects, tea polyphenols (TP), the main component of tea stains, have been widely studied in medical treatment, food, and biology. Here, inspired by an interesting phenomenon that some tea stains are difficult to clean in the cup after brewing tea, a facile tea polyphenols coating method was explored at the ambient condition to mitigate membrane fouling . The modification method is not only environmental protection, low cost, but also safe and healthy. The contact Angle of the TP modified film is reduced to 39°, and the pure water flux is up to 13,159 L•m-2• H-1, indicating that the hydrophilicity is significantly improved. In addition, TP film also has excellent antifouling performance (emulsion retention rate is 98.9%, water flux recovery is about 99.7%). Meanwhile, the TP modified membrane was stable in the acidic condition in the long-term rinsing experiment. In addition, titanium ions were introduced to improve the stability of TP-modified membranes under pure water or alkaline conditions since the TP coating imparts a binding side to bind metal ions . In the pure water and alkaline condition, the modified membrane showed outstanding stability after Titanium ions have been complexed.
研究领域:
膜技术
·
材料科学
·
环境工程
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产品关联
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Ao Ma,Yan Bai,Jie Han,Qi Qi,Chengbing Ma,Yujuan Zhang,Tao Xie,Guohui Zhang,Huiquan Li,Yunkun Wang
Municipal sewage purification is an important means to alleviate water shortage. Polyvinylidene fluoride (PVDF) is a kind of ultrafiltration membrane widely used in water treatment but easy to incur biological contamination in the membrane separation process. Herein, a sequence of PVDF-based ultrafiltration membranes grafted with varying quaternary amines were designed to obtain fabulous antibacterial performance. Firstly, the antibacterial block copolymer composed of PVDF and quaternary ammonium salts is synthesized using the atom transfer radical polymerization technique. Subsequently, the copolymer is integrated into the matrix membrane through a phase inversion method. With a gradient change of alkyl chain lengths, we further explore the relationship between substituent structure and antibacterial properties. All functionalized membranes showed exceptional antibacterial activity with the highest efficiency of 83.3 % to E. coli and 69.1 % to E. faecalis. The as-anticipated properties were ascribed to the puncture effect shared by alkyl group and protective effect imparted by hydrophilic layer. During a series of cross-flow filtration experiment lasting for 10 h, the normalized flux retention was increased by a maximum of 1.52 times compared to pristine PVDF membrane. These results further highlight that the PVDF-based membrane functionalized by quaternary ammonium salt grafting is capacity of praiseworthy antibiofouling ability. Overall, our research provides a promising strategy to fabricate fouling-resistant ultrafiltration membranes and substantiates their potential utility in the realm of wastewater treatment.
研究领域:
环境科学
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材料科学
·
微生物学
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DOI
高影响因子
WATER RESEARCH
·
2017
·
IF 6.942
Yan-Fang Guan,Bao-Cheng Huang,Chen Qian,Long-Fei Wang,Han-Qing Yu
Polyvinylidene fluoride (PVDF) membrane has been widely applied in water and wastewater treatment because of its high mechanical strength, thermal stability and chemical resistance. However, the hydrophobic nature of PVDF membrane makes it readily fouled, substantially reducing water flux and overall membrane rejection ability. In this work, an in-situ blending modifier, i.e., extracellular polymeric substances (EPS) from activated sludge , was used to enhance the anti-fouling ability of PVDF membrane. Results indicate that the pure water flux of the membrane and its anti-fouling performance were substantially improved by blending 8% EPS into the membrane. By introducing EPS, the membrane hydrophilicity was increased and the cross section morphology was changed when it interacted with polyvinl pyrrolidone, resulting in the formation of large cavities below the finger-like pores. In addition, the fraction of pores with a size of 100–500 nm increased, which was also beneficial to improving membrane performance. Surface thermodynamic calculations indicate the EPS-functionalized membrane had a higher cohesion free energy, implying its good pollutant rejection and anti-fouling ability. This work provides a simple, efficient and cost-effective method to improve membrane performance and also extends the applications of EPS.
研究领域:
环境工程
·
污水处理
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hongai Zheng,Xiqian Zheng,Meilin Zhu,Cunzheng Xiao,Mengyao Li,Daquan Zhang,Lizhi Zhang
Modification of membranes is an effective method for degrading organic pollutants and alleviating membrane fouling. In this study, CuO-Fe 3 C-C catalyst was prepared by high-temperature pyrolysis. The membrane modified by CuO- Fe 3 C-C was prepared by vacuum filtration. The bacteriostatic rate of the modified membrane can reach to 96.8 %. Compared to the pristine membrane, the pure water flux of the modified membrane increased from 223.43 L m −2 h −1 bar −1 to 422.27 L m −2 h −1 bar −1 , the flux recovery ratio (FRR) of modified membranes increased from 39.7 % to 79.25 %. Removal rate of TC (Tetracycline) by modified membrane activated PMS can reach to 90.75 %. After 5 cycles, the degradation efficiency of modified membranes was still 83.77 %, which was only 6.39 % lower than that of the first cycle. Free radical quenching experiments and ESR tests explored the possible catalysis and antifouling mechanisms of the modified membrane system, the results showed main active species were SO 4 − •, OH•, O 2 − • and 1 O 2 . This study prepared membranes with excellent antifouling properties, providing a theoretical reference for alleviating membrane fouling in membrane-based water treatment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
E-POLYMERS
·
2021
·Vol. 22
·期 1
·69-74
·
IF 2.025
Hongmei Zhao,Zhang Dai,Tian He,Shufang Zhu,Xu Yan,Jianjun Yang
In recent years, with the rise of an intelligent concept, oral and maxillofacial surgery smart dressing had also attracted the interest of researchers, especially for the pH sensor with flexible medium. In this study, polyvinylidene fluoride (PVDF) nanofibrous yarn was fabricated by a conjugate electrospinning process and modified with in situ polymerization of polyaniline (PANI) forming a PANI/PVDF yarn. By a weaving process, these yarns could be weaved into a fabric. It was found that both the PANI/PVDF yarn and the fabric showed a sensitivity to pH, about −48.53 mV per pH for yarn and −38.4 mVper pH for fabric, respectively, in the pH range of 4.0–8.0. These results indicated that the prepared PANI-modified PVDF yarn and fabric might have a potential application in intelligent oral and maxillofacial surgery dressings for monitoring wound healing.
研究领域:
材料科学
·
生物医学工程
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DOI
高影响因子
POLYMER COMPOSITES
·
2023
·Vol. 44
·期 11
·7499-7509
·
IF 5.2
Jian Li,Jing Sun,Lulu Ren,Ting Lei,Juan Li,Jinbo Jin,Shanshan Luo,Shuhao Qin,Chengtao Gao,Ting Lei
The non-solvent induced phase separation technology was introduced to formulate titanium dioxide (TiO 2 )-hydroxyapatite (HAP) composite modified polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes, and research was conducted to explore the effect on PVDF UF membrane performance exerted by different addition amounts (0–1.0 wt%) of TiO 2 -HAP composite. The results indicated that when 0.3% TiO 2 -HAP composite was added, the composite membranes had a through-channel structure, with a uniform pore structure on the surface, so that they possessed a certainly raised pure water flux. Specifically, in contrast to the pure PVDF membrane, 0.3%-TiO 2 -HAP@PVDF UF membrane exhibited an incremented pure water flux by 59.09%. Besides, TiO 2 -HAP@PVDF UF membranes had decreased rejection rate of bovine serum albumin (BSA) together with water contact angle to 58.62% and 70.17°, respectively, compared to the pure PVDF membrane (85.52% & 92.75°), showing good hydrophilicity. Several pure water flux tests on the composite UF membranes revealed that the flux tended to be stable after the 4th test. In summary, the addition of TiO 2 -HAP composite is capable of efficiently ameliorating PVDF base membranes from the aspects of microstructure, hydrophilicity, antifouling properties, as well as stability, allowing a good application prospect in actual water treatment. Highlights The HAP can solve the poor adsorption of TiO 2 . The TiO 2 can improves the interfacial adhesion between HAP and polymer. The TiO 2 -HAP composite with excellent stability, corrosion resistance and et al. The TiO 2 -HAP@PVDF UF membrane with anti-pollution performance and stability.
研究领域:
材料科学
·
环境工程
·
膜技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）