JOURNAL OF MEMBRANE SCIENCE
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2016
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IF 5.557
Zhiwei Xu,Tengfei Wu,Jie Shi,Kunyue Teng,Wei Wang,Meijun Ma,Jing Li,Xiaoming Qian,Cuiyu Li,Jintu Fan
A novel graphene oxide/TiO 2 -polyvinylidene fluoride (GO/TiO 2 -PVDF) hybrid ultrafiltration membrane has been successfully developed via the phase inversion technique by supplementing with GO/TiO 2 nanocomposites , in which the synergistic coupling of GO and TiO 2 could result in improved photocatalytic activity and endow hybrid membranes with photocatalytic antifouling function. Compared with PVDF membranes supplemented with TiO 2 and GO, respectively, the GO/TiO 2 -PVDF membrane displayed significantly improved photodegradation efficiency (improved about 50–70%) and superior photodegradation kinetics (1.0–1.5 times faster) toward bovine serum albumin (BSA). Moreover, flux performance and flux recovery ratio of membranes revealed that the GO/TiO 2 -PVDF membrane could recover high flux after fouling, which thus presented self-cleaning property under UV static irradiation. Besides, the GO/TiO 2 -PVDF membrane showed a water flux up to 487.8 L m −2 h −1 , more than 2 times that of the pristine PVDF membrane, while keeping high BSA rejection (92.5%). Therefore, the GO/TiO 2 -PVDF membrane would have good potential in water treatment due to its high-performance multifunctional characters, i.e. separation, photocatalytic oxidation and self-cleaning, etc.
研究领域:
环境科学
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材料科学
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水处理工程
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DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
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2022
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IF 4.291
Bin Zhou,Yu Chen,Kun Hu,Shah Fahad,Yu-xuan Zhou,Yi-ming Yuan,Min Wang
Flexible pressure sensor array has attracted much attention in wearable electronics , but still lacks self-power, high resolution, large-area fabrication, and low crosstalk . Herein, we present a self-powered pressure sensor array via patterned piezoelectric polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) nanofibrous. The PVDF-TrFE nanofibers were collected by patterned metal ground electrodes that isolated each piezoelectric cell. The isolated sensing cells can effectively reduce the crosstalk caused by additional deformation. The potential from individual cell is detected through the row+column electrode configuration to determine the corresponding pressure point and trajectory information. The as-fabricated pressure sensor array showed an excellent linear piezoelectric response (2.5 mV/kPa), a fast response time (5 ms), and good repeatability (25,000 cycles). Furthermore, our piezoelectric devices with constructed PVDF-TrFE layer are feasible in scaling up to a large-area sensor array. Accurate recognitions of the letter "h" trajectory tracking and tactile sensation by our self-powered tactile sensor array show potential applications in electronic skin and artificial intelligence.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
ACS ES&T Water
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2022
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IF 0
Shuangling Xie,Jiale Du,Xuan Huang,Ailiang Gu,Shengqiong Fang,Riri Liu,Dong Zou,Jiuyang Lin,Ming Xie,Shuaifei Zhao,Wenyuan Ye
Membrane distillation (MD) has been widely used for resource recovery from high-salinity wastewater, due to its superior technical merits of high separation efficiency and potential integration of low-grade heat. Herein, a robust superhydrophobic PVDF membrane prepared by spray-coating of fluorinated silica nanoparticles was employed to treat highly saline dye wastewater by MD. Specifically, impacts of operation conditions, including temperature difference, feed flow-rate, salinity, dye concentration, and dye species, on MD performance of the fabricated superhydrophobic PVDF membrane were comprehensively investigated. The increase of temperature difference and feed flow-rate had a positive effect on the MD flux of the membrane. Conversely, the rise in salinity and dye concentration induced an adverse impact on the MD flux. Furthermore, the superhydrophobic PVDF membrane showed a strong robustness in treating complex streams, as demonstrated by consistently stable MD flux using various dye/NaCl mixed solutions. Due to the robust surface superhydrophobicity, the fabricated PVDF membrane exhibited impressive antiwetting and antifouling properties against highly saline dye wastewater, consistently stable permeation flux, and high dye/salt removal efficiency (>99.99%). Moreover, the superhydrophobic membrane showed a high water recovery (90%) from highly saline dye wastewater with a slight reduction (13.4%) in permeation flux during a 39 h MD filtration. These results signify the promising practicability of the fabricated superhydrophobic PVDF membrane in sustainable management of highly saline dye wastewater via MD.
研究领域:
环境科学
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材料科学
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产品关联
DOI
SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Qingwen Wu,Wenfeng Shen,Dawu Lv,Weigang Chen,Weijie Song,Ruiqin Tan
Resistive-type polyaniline (PANI) based sensing film was fabricated by a simple in-situ polymerization method with graphene (GP) as additives on flexible porous polyvinylidene fluoride (PVDF) substrate. The fabricated flexible GP-PANI/PVDF membrane demonstrates a multi-hierarchical porous microstructure, enhancing its sensing performance towards ammonia (NH 3 ). The optimized GP-PANI/PVDF sensor shows 60% response towards 1 ppm NH 3 with a response time of 46 s, and 10% response towards 0.1 ppm NH 3 at 24℃, respectively. Moreover, the GP-PANI/PVDF sensor presents excellent flexibility, exhibiting only small response values’ difference upon several bending angles and after 1500 bending/extending cycles. Besides, the GP-PANI/PVDF sensor exhibits a strong linear relationship between the NH 3 response values and working temperatures with a range of 24℃∼50℃. The results demonstrate that the flexible GP-PANI/PVDF film sensor holds great promise for the application of portable, lightweight, and room temperature sub-ppm level NH 3 detection devices.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
POLYMER COMPOSITES
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2024
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IF 4.8
Can Qu,Yiting Long,Xuemei Zhang,Jingsong Liu,Linyu Pu,Xu Huang
In this paper, UiO-66 nanoparticles were synthesized through the hydrothermal synthesis technique. Subsequently, a series of metal-organic framework/polyvinylidene fluoride (MOF/PVDF) composite films were produced via a solution-casting approach. The dielectric properties of UiO-66/PVDF (U/P) composite are improved with the addition of UiO-66. The dielectric constant ( ɛ r ) of 20 wt% U/P composite film at 10 2 Hz is 11.20, 1.44 times that of pure PVDF film ( ɛ r = 7.78). However, the breakdown strength ( E b ) was only 95 kV mm −1 . To solve the problem of sharp decline in E b , TiO 2 with a wide band gap was introduced to form an insulating layer on the surface of UiO-66. This reduces the difference in electrical properties between the filler and PVDF, hinders the formation of the conductive path within the composite, reduces leakage current, and increases E b . Compared with the U/P composite, the ɛ r and E b of TiO 2 @UiO-66/PVDF (T@U/P) composite film are increased, and the dielectric loss (tan δ ) and leakage current density ( J ) are decreased. The energy storage density ( U e ) of 10 wt% T@U/P composite film is 4.51 J cm −3 and the charge and discharge efficiency ( η ) is 84.61% at 150 kV mm −1 . These results indicate that the dielectric properties of UiO-66 can be significantly enhanced by using titanium dioxide as an insulating layer. Highlights By introducing UiO-66, the ɛ r of PVDF material is improved. Modifying UiO-66 with TiO 2 can improve its breakdown strength significantly. The U e of the T@U/P-10 composite modified with UiO-66 is 4.51 J cm −3 .
研究领域:
材料科学
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电气工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Chengjun Li,Wang Li,Chengwei Sun,Zheng Ma,Yingchao Wei,Wenyuan Ma,Boyu Yang,Xin Li,Yubo Luo,Junyou Yang
Bi2Te3-based thin films are gaining recognition for their remarkable room temperature thermoelectric performance. Beyond the conventional “process–composition–performance” paradigm, it is highly desirable to explore new methods to enhance their performance further. Here, we designed a sandwich-structured Ag/PZT/PVDF/Bi0.5Sb1.5Te3(BST) thin film device and effectively regulated the performance of the BST film by controlling the polarization state of the PZT/PVDF layers. Results indicate that polarization induces interlayer charge redistribution and charge transfer between PZT/PVDF and BST, thereby achieving the continuous modulation of the electrical transport characteristics of BST films. Finally, following polarization at a saturation voltage of 3 kV, the power factor of the BST film increased by 13% compared to the unpolarized condition, reaching 20.8 μW cm–1 K–2. Furthermore, a device with 7 pairs of P–N legs was fabricated, achieving a cooling temperature difference of 11.0 K and a net cooling temperature difference of 2.4 K at a current of 10 mA after the saturation polarization of the PZT/PVDF layer. This work reveals the critical effect of introducing ferroelectric layer polarization to achieve excellent thermoelectric performance of the BST film.
研究领域:
材料科学
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能源技术
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2024
·Vol. 14
·期 26
·18432-18443
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IF 3.9
Jiao Wang,Hemu Pi,Panchao Zhao,Na Zhou
The presence of methyl orange (MO) and ciprofloxacin (CIP) in wastewater poses a serious threat to the environment and human health. Titanium dioxide nanoparticles (TiO2 NPs) are widely studied as photocatalysts for wastewater treatment. However, TiO2 NPs have the drawbacks of high energy required for activation, fast electron–hole pair recombination and difficulty in recovering from water. To overcome these problems, europium decorated titanium dioxide/poly(vinylidene fluoride) (Eu–TiO2/PVDF) membranes were successful prepared in this work by combining the modified sol–gel method and the immersion phase inversion method. The Eu–TiO2/PVDF membranes obtained with the increase of Eu–TiO2 NPs content during the preparation process were named M1, M2 and M3, respectively. The pure PVDF membrane without the addition of Eu–TiO2 NPs was named M0, which was prepared by the immersion phase inversion method and served as a reference. The prepared Eu–TiO2/PVDF membranes could not only adsorb MO, but also degrade CIP under visible-light irradiation. Moreover, the Eu–TiO2/PVDF membranes exhibited adsorption–photocatalytic activity towards a mixture of MO and CIP under visible-light irradiation. Last but not the least, the Eu–TiO2/PVDF membranes exhibited excellent recyclability and reusability, opening the avenue for a possible use of these membranes in sewage-treatment plants.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2019
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IF 2.781
Wenfeng Han,Haili Wang,Bing Liu,Xiliang Li,Haodong Tang,Ying Li,Huazhang Liu
With Al(NO 3 ) 3 ·9H 2 O as the Al precursor and PVDF as the fluorine source, freestanding AlF 3 sub-microspheres were fabricated following calcination , without the involvement of corrosive HF solution. With the varying of Al(NO 3 ) 3 ·9H 2 O to PVDF weight ratio, θ -AlF 3 and β -AlF 3 , α -AlF 3 were obtained respectively. The formation mechanism, morphology, surface properties and catalytic activities for the dehydrofluorination of 1,1,1,2-tetrafluoroethane to trifluoroethylene were investigated. During the fabrication process, Al(NO 3 ) 3 interacts with O=C bond in DMF. Meanwhile, DMF further interacts with CH 2 species in PVDF. Following calcination , PVDF decomposes to CO 2 and HF fluorinating Al species to AlF 3 . The growth of AlF 3 crystal and particle are confined by PVDF. Consequently, θ -AlF 3 , β -AlF 3 and α -AlF 3 are achieved. At 450 °C, HFC-134a conversion of 23% and reaction rate of 1.9 mmol g −1 h −1 are approached over θ -AlF 3 catalyst. The reaction rate is almost 3 times higher than that of β -AlF 3 and is 40% higher than that of high surface area α -AlF 3 prepared by sol-gel method. No significant deactivation is observed in time on stream of 40 h. The stability is attributed to the interaction of AlF 3 with carbon frame work. The present study provides a scalable and facile synthesis route for AlF 3 spheres with controllable phase structures.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Lei Cao,Hongpeng Liu,Haoyu Li,Huiming Lin,Lingfei Li
Microfiltration membrane separation technology has been widely employed in the field of oil-water separation because of its low energy consumption. However, the practical applications of polyvinylidene fluoride (PVDF) microfiltration membrane are limited due to its strong hydrophobicity and poor anti-fouling. A superhydrophilic/underwater superoleophobic PVDF microfiltration membrane is prepared through surface co-coating inspired by mussel chemistry. The dopamine (DA) and fulvic acid (FA) generate a hydrophilic coating with hydrophilic functional groups through a mild Michael addition/Schiff base reaction. When the DA/FA ratio is 2/8 and a modification time is 6 h, the pure water flux reaches 8011 L m −2 h −1 bar −1 , the flux of oil-in-water emulsion is 1915 L m −2 h −1 bar −1 , and the rejection is 99.1 %. The retention rate of the membrane for oil-water emulsions containing different oil phases (heavy and light oils) is consistently above 98.5 % and shows high recoveries ( FRR > 86.6 %) after twenty separations. Modified membranes have high anti-pollution ability for characteristic pollutants in water bodies (for example: BSA, SDS). This work demonstrates a simple surface coating preparation method that has excellent separation performance, and environmental friendliness, offering a promising strategy for large-scale modified membranes to treat oily wastewater.
研究领域:
材料科学
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环境工程
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表面化学
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产品关联
DOI
高影响因子
Journal of Energy Storage
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2024
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IF 8.9
Tao Wang,Yuqun Deng,Huajun Sun,Dawei Wang,Mingfu Zhang
Commercially available flexible dielectric capacitors with high energy density ( U d ) still present a significant challenge due to the inherent trade-off between breakdown strength ( E b ) and dielectric constant ( ε r ). In this context, a novel strategy is proposed to synchronously improve the E b and ε r of PVDF-based polymer capacitors by incorporating AZO-BT heterostructure nanoparticles, forming AZO-BT/PVDF composite films. Initially, the tightly polarized AZO affixed to the surface of BT particles create a localized electric field that enhances and sustains the polarization intensity of BT. Additionally, the heterojunction electric field generated inhibits the migration of the injected electron. Furthermore, the semiconducting AZO with high electron affinity effectively captures and traps the injected and excited electrons . Notably, the existed oxygen vacancies in AZO significantly enhances E b and polarization reverse. Consequently, the AZO-BT/PVDF composite film achieves the highest U d of 9.10 J·cm −3 at 460 MV·m −1 . The innovative approach of constructing a semiconducting-ferroelectric heterostructure offers a promising avenue for designing and fabricating high energy density polymer capacitors.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
Nanoscale
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2024
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IF 5.8
Haitao Li,Yingying Zhang,Han Dai,Veronica Pereir,Junfeng Zhao,Hiang Kwee Lee
Polyvinylidene fluoride (PVDF)-based piezoelectric catalysts show promise in mechanical force-driven catalysis due to their good biocompatibility, flexibility, and ease of fabrication. However, the catalytic activity of pristine PVDF is limited due to its low piezoelectric phase content (<20%), poor orientation, and low surface carrier concentration. Here, we introduce an efficient PVDF-based composite nano-catalyst (rGO/PVDF) with high piezoelectric catalytic performance. We achieve this by employing a composite strategy that combines nanoscale water-induced polarization with polar functional group-modified graphene (rGO) serving as a nanoelectrode. The nanoscale water polarization effect, together with the two-dimensional planar structure of PVDF and the modified graphene's polar functional groups, effectively induces orientation in the PVDF piezoelectric phase to increase the functional β phase content. As a result, the β phase content and crystallinity of rGO/PVDF reach 95% and 40%, respectively, which are 600% and 170% higher compared to those of pristine PVDF. This enhancement plays a crucial role in endowing the material with strong force-to-electricity conversion characteristics. Additionally, the surface-modified rGO also boosts PVDF's surface carrier concentration and provides active sites for catalysis on the rGO/PVDF composite. Notably, under optimized conditions, our catalyst achieves a ∼99.1% degradation rate of organic pollutants (10 mg L−1) after 12 minutes of sonication at 240 W and maintains a high efficiency of ∼93.7% even at a 10 times higher pollutant concentration (100 mg L−1). Our piezoelectric catalyst also demonstrates efficient H2O2 production at 95.8 mmol grGO−1 h−1, which is ∼9-fold and ∼134-fold higher than those of untreated PVDF and previously reported PVDF-based piezoelectric catalysts, respectively. This work paves the way for the development of highly efficient PVDF-based piezoelectric catalysts, thereby offering valuable insights for the advancement of mechanically driven catalysis in the environmental, energy, and chemical sectors.
研究领域:
材料科学
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环境科学
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催化
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纳米技术
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Xia Xu,Shipeng Cheng,Zekai Lu,Pu Li,Yingang Xue,Yongqiang Yang,Tengya Ni,Jie Teng
The pervasive issue of oily wastewater presents a critical environmental challenge, necessitating the development of advanced membranes that offer high purification efficiency, durability, and versatility. In this study, we introduce a novel bioinspired multifunctional membrane, synthesized by modifying polyvinylidene fluoride (PVDF) with fibrous two-dimensional carbides and nitrides (MXene) and silica (SiO 2 ) nanoparticles, drawing inspiration from the complex structure of coral stones. The membrane was fabricated using the phase inversion technique, producing a robust material that achieves over 99 % separation efficiency for oil–water mixtures. Beyond oil–water separation, the membrane exhibited exceptional performance in removing various contaminants from complex oily wastewater, including heavy metals, dyes, and phenol. Remarkably, the membrane maintained its high purification efficiency even after 5 consecutive cycles of oil–water separation and pollutant adsorption. This bioinspired multifunctional modified PVDF (MMP) membrane represents a major advancement in wastewater treatment technology, with significant potential for widespread application in the purification of complex oily wastewater.
研究领域:
材料科学
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环境工程
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仿生学
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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）