RSC Advances
·
2015
·Vol. 5
·期 66
·53653-53659
·
IF 3.84
Jing Zhu,Xinzhen Zhao,Chunju He
Hybrid polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes with excellent antifouling properties were prepared by non-solvent-induced phase separation through blending zwitterionic SiO2 nanoparticles. Lysine was used to modify SiO2 nanoparticles to generate a surface zwitterion of the amino acid type. Zwitterionic SiO2 nanoparticles were distributed uniformly in the membrane bulk to avoid massive agglomeration and to significantly improve the hydrophilicity and separation performance of PVDF UF membranes. The amount of BSA adsorbed on a hybrid ZP-5% membrane surface of static fouling test decreased to 10 μg cm−2, and the secondary water flux recovery rate (FRR) increased to more than 95% for the dynamic antifouling test of BSA and HA. The addition of zwitterionic SiO2 nanoparticles enhanced the antifouling ability of the membrane through inhibiting irreversible fouling and prolonging the service life of the PVDF UF membrane.
研究领域:
材料科学
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环境工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Jun Pan,Min Chen,Xianli Xu,Shi-Peng Sun,Zhaohui Wang,Zhaoliang Cui,Weihong Xing,Naser Tavajohi
Large amounts of lignin, hemicellulose , organic matter and inorganic salts are present in pulping and papermaking wastewater. Therefore, the treatment and discharge of pulping wastewater are important issues. We have designed and developed the world's first zero liquid discharge (ZLD) system for it based on pretreatment-membrane-evaporative crystallization integrated technologies . However, for the treatment of high salt reverse osmosis (RO) brine, there are still challenges that need to be addressed. In this work, the feasibility of using a membrane distillation crystallization (MDC) process to treat high saline RO brine was investigated. Two different coating materials , Hyflon AD 40H and perfluoropolyether (PFPE), were applied to improve the membrane surface hydrophobicity for stable and efficient performance. After modification, the water contact angle was up to 138.4 o and 157.7 o for Hyflon/polyvinylidene fluoride (PVDF) and PFPE/PVDF composite membranes, respectively. Moreover, the PFPE/PVDF membrane showed a higher repellency toward RO brine, which is better for the following MDC treatment. During the MDC progress using composite PFPE/PVDF membranes, the salt crystals precipitated and gradually accumulated. More importantly, the final NaCl purity can be up to 94%. Therefore, it is hopeful to improve of the existing ZLD system by MDC operation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Mengdi Zhang,Zifang Tan,Qingling Zhang,Yutong Shen,Xue Mao,Liang Wei,Runjun Sun,Fenglei Zhou,Chengkun Liu
With the rapid development of the economy and technology, intelligent wearable devices have gradually entered public life. Flexible sensors, as the main component of wearable devices, have been widely concerned. However, traditional flexible sensors need an external power supply, lacking flexibility and sustainable power supply. In this study, structured poly(vinylidene fluoride) (PVDF)-based composite nanofiber membranes doped with different mass fractions of MXene and zinc oxide (ZnO) were prepared by electrospinning and were then assembled to flexible self-powered friction piezoelectric sensors. The addition of MXene and ZnO endowed PVDF nanofiber membranes with better piezoelectric properties. The structured PVDF/MXene-PVDF/ZnO (PM/PZ) nanofiber membranes with a double-layer structure, interpenetrating structure, or core–shell structure could further enhance the piezoelectric properties of PVDF-based nanofiber membranes through the synergistic effects of filler doping and structural design. In particular, the output voltage of the self-powered friction piezoelectric sensor made of a core–shell PM/PZ nanofiber membrane showed a good linear relationship with the applied pressure and could produce a good piezoelectric response to the bending deformation caused by human motion.
研究领域:
材料科学
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纳米技术
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 48
·20999-21006
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IF 3.288
Junda Wu,Atian Xie,Jin Yang,Jiangdong Dai,Chunxiang Li,Yongsheng Yan,Jiuyun Cui
In order to solve urgent environmental problems caused by oil spills, it is meaningful and necessary to develop novel materials or techniques for efficient oil/water separation. Here, a new polyvinylidene fluoride (PVDF)-based composite membrane was successfully fabricated via a layer-by-layer self-assembly process, where the active sites were provided by pDA for the CaCO3 growth. Importantly, the CaCO3 structure could be regulated by the concentration of the precursor solution, showing the high flexibility of preparation. The as-prepared PVDF@pDA@CaCO3 membrane possessed superhydrophilic/underwater superoleophobic property and superior anti-fouling ability. In addition, the optimal PVDF@pDA@CaCO3-2 membrane showed a high permeation flux only under gravity, and the separation efficiency was as high as 99%. With the merits of low-cost and great separation performance, the as-prepared PVDF@pDA@CaCO3 membrane exhibited great potential in practical industrial applications for highly efficient oil/water emulsion separation.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
Membranes
·
2025
·Vol. 15
·期 5
·155
·
IF 3.6
Liangku Zhai,Jiuyun Cui,Lei Lu,Hailong Wang,Can Wei,Jirong Luo,Atian Xie
The simple preparation of superhydrophilic membranes with good stability is of great significance for efficient oil–water separation. In this work, a polyvinylidene fluoride (PVDF) membrane modified with tannic acid (TA) and pectin (PT) was developed through immersion in TA/PT solutions, facilitating the formation of complexes via co-deposition. The optimized PVDF@TA/PT3 membrane exhibited superhydrophilicity/superoleophobicity. The membrane achieved remarkable separation efficiencies exceeding 98.3% and fluxes ranging from 71.3 to 156.3 L m −2 h −1 for various oil–water emulsions under gravity-driven conditions. Notably, the membrane maintained exceptional durability through 10 separation cycles, retaining about 98% efficiency while exhibiting strong antifouling properties. Excellent separation performance coupled with facile fabrication protocol and chemical stability of the membrane, position the PVDF@TA/PT membrane as a technologically viable candidate for wastewater purification.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 9
·e202304054
·
IF 1.9
Caihong Xue,Xianlan Wang,Guijun Yang,Hao Yang,Hui Nan,Guocai Ma,Shiai Xu
Graphical A larger specific surface area and three-dimensional (3D) permeable lamellae carboxylated g-C 3 N 4 (HCN) are successfully prepared by HNO 3 and introduced into the PVDF-HFP to obtain a high-performance composite separator. The wettability and ionic conductivity of separator can be improved through the carboxylated HCN. The LFP || Li half-cell of the separator has a capacity of 71 % at a 5 C rate and 94 % after 400 cycles at a 2 C rate. Polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) is a standard electrolyte membrane and binder material for lithium-ion batteries (LIBs) because of the benefits of membrane formation and strong mechanical properties. Still, its use is limited due to unavoidable defects such as high crystallinity and poor electrochemical performance. In this paper, a larger specific surface area and three-dimensional (3D) permeable lamellae carboxylated g-C 3 N 4 (HCN) were successfully prepared by HNO 3 and introduced into the PVDF-HFP to obtain a high-performance composite separator. The wettability and electrolyte absorption of PVDF-HFP separator can be improved through the carboxylated HCN. More crucially, because PVDF-HFP has several active sites and low crystallinity, adding HCN can greatly increase the ionic conductivity of separators. The ionic conductivity of PH-HCN at 25 °C is 0.52 S cm −1 , 4.7 times higher than the initial PVDF-HFP membrane, and the oxidation potential can reach 4.8 V. The assembled lithium-ion batteries half-cell has a capacity of 71 % at a 5 C rate and 94 % after 400 cycles at a 2 C rate. Therefore, the improved separator has the potential to be applied to high-performance LIBs.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Bing Cheng,Peng Du,Jin Xiao,Xiaowen Zhan,Lingyun Zhu
Utilizing aluminum-doped nano LLZO (Li6.28La3Zr2Al0.24O12) as the ceramic filler, we synthesized and optimized LLZO/PVDF/LiClO4 composite polymer electrolytes (CPEs) to achieve high ionic conductivity and good interfacial stability with metallic lithium. The research examines how the PVDF grade and the mass ratio of PVDF to LiClO4 affect the ionic conductivity, lithium metal compatibility, and overall performance of CPEs. The CPE using Kynar PVDF 741 and a PVDF-to-LiClO4 mass ratio of 2:1 emerged as superior, displaying a high ionic conductivity at room temperature (0.12 mS/cm), the lowest activation energy (0.247 eV), an extensive electrochemical stability window (approximately 4.9 V), and robust mechanical strength. In tests with lithium metal symmetric cells, the membrane facilitated over 1000 h of stable cycling at 0.1 mA cm–2 and 0.1 mAh cm–2. Furthermore, when integrated into full solid-state lithium–metal batteries with LiFePO4 cathodes, it sustained more than 80% capacity retention across 500 charge/discharge cycles at a rate of 0.5 C with constantly high Coulombic efficiencies above 99.8%, underscoring its exceptional durability and efficiency. This research provides a practical framework and benchmarks for developing LLZO/PVDF-based CPEs with high ionic conductivity and enhanced stability against lithium metals.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Dongdong Kang,Huiju Shao,Guijing Chen,Xiaoliang Dong,Shuhao Qin
Amphiphilic copolymers have increasingly attracted researchers’ attention to produce the hydrophilic and antifouling polymeric membranes. However, few studies has been reported on systematic manipulation of matrix miscibility to control the membrane microstructure during the nonsolvent induced phase separation (NIPS). Herein, a facile method is brought forward to investigate the effects of miscibility on the structure and performance of the membranes. Through the transformation of styrene-maleic anhydride copolymer (SMA) into sodium styrene-maleic anhydride copolymer (SMANa), a homogeneous and transparent dope solution was successfully prepared. Next, the crescent pores and spherical particles in the PVDF/SMA membrane were eliminated to achieve the uniformly porous PVDF/SMANa membranes by the exchange of nonsolvent and solvent components. Importantly, SMANa could segregate at the external surface and internal pore walls as SMA to enhance the hydrophilicity and antifouling properties of the membranes. Subsequently, by optimizing the dope solution composition and coagulation bath temperature, PVDF/SMANa ultrafiltration membranes exhibited the pure water flux of 1014 L/m 2 h and the rejection to BSA of 98.9%. These results outperformed previously reported ones for similar PVDF composite membranes. Significantly, this strategy can be applied to the large-scale manufacture of membranes.
研究领域:
材料科学
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膜技术
·
高分子化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Liang Xuan,Li-Jiao Tian,Tian Tian,Xue-Meng Wang,Dian-Hai Yang,Han-Qing Yu
Modifying membranes with nanoparticles is a promising approach to mitigate biofouling in membrane preparation processes. However, high costs of the modification agents limit the practical applications of this approach. In this work, we developed a cost-effective and ecofriendly method to provide polyvinylidene fluoride membrane with a strong antimicrobial activity by loading silver nanoparticles (AgNPs). In this approach, gallic acid (GA) was used as a capturing and reducing agent to in situ synthesize AgNPs on membrane surface. The resulting AgNPs-functionalized membrane exhibited a 3.5-fold higher pure water flux and enhanced antifouling capacity compared to the control membrane. Specifically, AgNPs endowed the membrane a compelling antimicrobial activity on both Gram-positive and Gram-negative bacteria, evidenced by diffusion inhibition zone and bacterial proliferation test results. More importantly, pomegranate peel extracts rich in GA was effectively used in such a membrane functionalization approach. Taken together, this work demonstrates the robust in situ fabrication of antimicrobial AgNPs-functionalized membranes through bio-derived GA and provides a promising alternative for their potential practical applications.
研究领域:
材料科学
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环境工程
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Changqing Miao,Yujia Tong,Fiona Hammond Quarcoo,Xiaohui Ju,Weixing Li
Mussels in nature can adhere to the surface of hydrophobic substances by secreting adhesive substances, which has attracted wide attention by coating method for membrane modification. However, complicated processing procedures remain major problems. Here, we proposed a simple, mild and fast surface coating method. Proanthocyanidins (PC) react with 3-aminopropyl triethoxysilane (KH550) under the accelerated action of the oxidant ammonium persulfate (APS) at room temperature to form a polyphenol network. The hydrophilic network coating was constructed on PVDF membrane by surface co-deposition method for 1 h, which could effectively separate different emulsions. The water permeability of modified membrane was 18,271 L∙m −2 ∙h −1 ∙bar −1 . The permeability for separating isooctane-in-water emulsion arrived at 14,223 L∙m −2 ∙h −1 ∙bar −1 and the oil rejection rate was 99.6 %. After ten cycles, the separation flux was 10,836 L∙m −2 ∙h −1 ∙bar −1 with the rejection rate of 98.8 %. Modified membranes were soaked in acid and alkali salt solutions of different pH values for 30 days, and maintained good underwater oleophobic performance (>156°). The developed membrane showed excellent separation performance, oleophobic property and acid-base stability. The proposed membrane modification strategy was prospective for efficient separation of oily wastewater.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Advances
·
2025
·
IF 4.6
Yu Ma,Lan Yang,Shangdi Wu,Liran Xu,Hua Huang
Polydopamine (PDA) is a widely utilized photothermal conversion material recognized for its ease of synthesis and environmental friendliness. However, its relatively weak light absorption capabilities lead to lower photothermal efficiency, restricting its application in solar steam generation (STG) processes. To effectively enhance light absorption, this study introduces a deep co-deposition method for the microstructural design of STG membranes. Unlike traditional surface co-deposition methods, which coat a layer of PDA on the membrane surface, the deep co-deposition method allows for the incorporation of PDA within the internal nanohydrogel structural units of the membrane. This approach significantly increases the PDA loading, resulting in a marked enhancement of light absorption capabilities. In the near-infrared region (800–2500 nm), where the light absorption of PDA is relatively weak, the absorbance improved from 70.18% (surface co-deposition) to 88.20% (deep co-deposition). While PDA has been extensively studied across various fields, its application as a structural and functional additive in hydrogels remains limited, particularly in comparison to the rapid advancements in PDA-based surface-engineered hydrogels. Thus, this study may provide valuable insights for related research areas.
研究领域:
材料科学
·
环境科学
·
能源研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMBUSTION AND FLAME
·
2023
·
IF 4.4
Huiqing Mao,Xiandie Zhang,Rui Cui,Chun Zhang,Xiang Zhou
In this study, Si@PVDF composite microspheres are prepared by the electrostatic spraying method. The spheres are with average diameter of around 2 μm (when at ideal stoichiometry), within which Si nanopowder is uniformly distributed. The exothermic properties of samples are studied through simultaneous thermogravimetry and differential scanning calorimetry . Benefiting from the improved interfacial contact quality, Si@PVDF shows increased chemical reactivity in terms of reduced reaction onset temperature , peak temperature and apparent activation energy than those of physically mixed Si/PVDF counterpart. Si/PVDF cannot be ignited through Joule heating , either in the powder of pellet form, while self-sustained combustion propagation is observed for Si@PVDF pellets. The combustion behaviors of Si@PVDF pellets are systematically studied in open-air (where light signal is analyzed) and constant-volume (where pressure signal is analyzed) conditions. The results show that the combustion process is influenced by the equivalence ratio, porosity of the pellet and the accessibility of O 2 gas in the environment. Overall, the encapsulation of Si nanopowder into PVDF microspheres using electrostatic spraying shortens the mass and heat transfer distance and thus realizes enhanced energetic characteristics.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）