CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ru Wang,Xiaoyu Xie,Chunxiang Xu,Yi Lin,Daotong You,Jinping Chen,Zhuxin Li,Zengliang Shi,Qiannan Cui,Mingliang Wang
Piezoelectric field engineering has been recently proved to restrain the photogenerated carrier recombination both in the bulk and on the surface of photocatalyst. Herein, we proposed a bi-piezoelectric ZnO nanorods (NR)/PVDF-HFP spongy film that can utilize water flow vibration to boost the photocatalytic degradation of organic dye. The composite photocatalyst can be deformed by water flow to generate an integrated piezoelectric field from PVDF-HFP and ZnO NR , which can considerably drive the separation and transfer of photogenerated charge carriers in ZnO NR. As a result, the ZnO NR/PVDF-HFP spongy film shows a ∼ 3 fold increase in reaction rate constant of degrading methyl orange (MO) with irradiation as flow speed increases from 200 rpm to 1000 rpm. A model about the bi-piezoelectric effect of ZnO NR/PVDF-HFP was configurated according to a series of characterization by piezoelectric force microscopy (PFM) and photoluminescence (PL). This work demonstrates the contribution of the bi-piezoelectric effect to photocatalytic water decontamination and provides a promising strategy to use dual-sustainable energy— solar and water energy.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Hongai Zheng,Yao Zhou,Derui Wang,Meilin Zhu,Xin Sun,Shuangyan Jiang,Yankun Fan,Daquan Zhang,Lizhi Zhang
Catalytic membrane reactors (CMR) based on the sulfate-based advanced oxidation processes (SR-AOPs) have exhibited fantastic applications prospects in water treatment. We synthesized Cu-MOF-74 by an environmentally friendly and facile method, then used it as PVDF (polyvinylidene fluoride) membrane surface modification layer. The results presented that Cu-MOF-74 can significantly improve anti-fouling ability of PVDF membrane (60.9% and 64.1% anti-adsorption of dye and protein). The modified membranes exhibited relatively low flux loss. Simultaneously the modified membrane catalyzed peroxymonosulfate (PMS) to achieve 97.1% degradation efficiency of Rhodamine B (RhB) within 60 min and 90.2% dye penetration recovery within 30 min. Cu-MOF-74 exhibited greater catalytic activity than homogeneous Cu (II) and showed a wide range of pH adaptation. Finally, XPS and ESR proved that it was the redox of Cu (II)/Cu (I) in the Cu-MOF-74 structure making PMS mainly produce SO 4 - • and •OH to oxidize pollutant molecules. The modus proposed in this study may provide a more promising strategy for the preparation of high-efficiency catalytic membranes and their practical applications in wastewater treatment processes .
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiaobo Hu,Yanqiao Xu,Jiancheng Wang,Jiaxin Ma,Lianjun Wang,Wan Jiang
CsPbX 3 (X = Cl, Br, I) perovskite nanocrystals (NCs) are emerging as promising candidates for fluorescence sensors due to their superior optoelectronic properties. However, the poor stability restricts their practical applications in aqueous fluorescent detection. Herein, we report in-situ encapsulation of CsPbX 3 NCs into uniform PVDF-HFP/PS polymer nanofibers with fine diameter of only 49.9 ± 2.2 nm by one-step electrospinning process. The as-fabricated CsPbX 3 @PVDF-HFP/PS nanofibers exhibit high photoluminescence quantum yield (PLQY) of 90%, tunable emission wavelength covering the whole visible range of 451.5–650.8 nm. Most importantly, the water stability of nanofiber membranes can be significantly improved by introducing the 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (PFDTMS) as hydrophobic additives, in which their PL intensity can retain 88% initial value after water immersion for up to 100 days. The universality of this fabrication strategy for the stable nanofibers is demonstrated by utilizing different types of polymers and perfluorosilanes (PFSs). Taking advantage of excellent optical properties, fine diameter and high hydrophobicity of PFDTMS-modified CsPbBr 3 @PVDF-HFP/PS nanofibers, the detection for rhodamine 6G (R6G) and rhodamine B (RhB) in aqueous solution with maximum fluorescence resonance energy transfer (FRET) efficiency up to 80.9% and 69.7% are realized, respectively. Notably, these electrospun nanofiber membranes possess outstanding durability and recyclability, indicating their great potential in multifunctional photoelectric applications.
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 17
·2524-2534
·
IF 8.683
Xinyan Lv,Zhonglin Wei,Canyu Cui,Wenwen Wang,Yumei Tan,Shihui Jiao,Guangsheng Pang
Developing superhydrophobic material with good chemical stability, non-toxic and low-cost for effectively handling oil spill incidents, chemical leakages and industrial oily wastewater has become an urgent need. In this work, superhydrophobic Fe3O4@C microspheres have been successfully anchored on polyurethane (PU) sponge skeleton surface with polyvinylidene fluoride (PVDF) as intermediate layer. The superhydrophobic Fe3O4@C/PVDF/PU sponge possesses outstanding superhydrophobic performance with water contact angle (WCA) of 156.5° and sliding angle (SA) of 6°. Meanwhile, the Fe3O4@C/PVDF/PU sponge shows excellent chemical, thermal and mechanical stabilities under harsh conditions, high separation efficiencies for surfactant-stabilized organic solvent/water emulsions (more than 99.6% for both O/W and W/O emulsions) and preferable recyclability (more than 15 cycles). The comprehensive performances of the Fe3O4@C/PVDF/PU sponge make it a promising candidate for the treatment of industrial oily wastewater.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 40
·e52813
·
IF 3.057
Hongbin Li,Jiliang Dai,Yue Hu,Heshan Zheng,Xiumin Ge,Yongqiang Guo,Shuzhen Gao,Chao Liu
Herein, the poly(vinylidene fluoride) (PVDF) composite membranes blended with pineapple leaf nanocrystalline cellulose (PLNC) and g-C 3 N 4 for ultrafiltration were designed and fabricated via surface segregation during non-solvent induced phase separation. The incorporation of PLNC and g-C 3 N 4 endows the PVDF composite membrane with a higher porosity, enhancing the pure water flux of PVDF/g-C 3 N 4 /PLNC membrane by 256.75% compared to the PVDF membrane, while maintaining a higher water flux recoveries of 82.1%. Moreover, surface chemical compositions, surface and cross-section morphologies, degree of crystallinity were also characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray diffraction, respectively. The mechanical properties of the PVDF composite membranes were also investigated. All the above experimental data showed that the addition of PLNC and g-C 3 N 4 can greatly improve the performance of the PVDF membrane. The prepared modified membrane has potential application value in the field of wastewater separation and treatment.
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 18
·3912
·
IF 4.967
Juan Yi,Yiheng Song,Shixian Zhang,Zhilong Cao,Chenjian Li,Chuanxi Xiong
For digging out eco−friendly and well−performed energy harvesters, piezoelectric nanogenerators are preferred owing to their effortless assembly. Corona−poling promotes output performance of either aligned or porous PVDF electrospun films and higher piezoelectric output was achieved by corona−poled porous PVDF electrospun films due to more poled electret dipoles in pores. Increasing the duration of electrospinning rendered more electret dipoles in PVDF porous electrospun films, resulting in higher piezoelectric output. Moreover, corona−poled PVDF/Y−ZnO porous electrospun films performed better than corona−poled PVDF/ZnO porous electrospun films because of the larger polar crystal face of Y−ZnO. Flexible piezoelectric polymer PVDF and high−piezoelectric Y−ZnO complement each other in electrospun films. With 15 wt% of Y−ZnO, corona−poled PVDF/Y−ZnO porous electrospun films generated maximum power density of 3.6 μW/cm2, which is 18 times that of PVDF/BiCl3electrospun films.Keywords:poly(vinylidene fluoride);Y−ZnO;electrospining;corona poling;wearable device
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 2
·1019-1035
·
IF 4.682
Wang Zhen,Tao Jie,Shen Yizhou,Liu Senyun
Composite film heater is becoming the focus of research in the deicing field, owing to its advantages of high electro-thermal efficiency and lightweight. In this work, a new composite film heater with ultralow conductive filler was designed and prepared by mixing insoluble ethyl vinyl acetate (EVA) and soluble polyvinylidene fluoride (PVDF) in dimethylformamide (DMF). It is common sense that many insoluble EVA fillers degrade mechanical properties due to the macro-interface defect. The molecular dynamic simulation indicated that interfacial blending regions were formed more easily between molten EVA and soluble PVDF on account of the similar solubility parameter and stronger adsorption energy between Vinyl acetate segmer and PVDF segmer. The semi-compatible system was favorable to eliminate the macro-interface defect between EVA and PVDF partially. The film heater showed better tensile strength, flexibility, and bending durability after heat treatment of 80 °C. Moreover, the film heater had an outstanding heating effect, fast electro-thermal response time, low-energy consumption, and excellent thermal cycling stability. It achieved the steady-state temperature of 117.4 °C and the heating rate of 1.348 °C/s when the ratio of PVDF to EVA was 1:1 and the amount of CNT was only 10% at 28 V. The optimal ratio of CNT and EVA could construct a double reticular structure, consists macroscopic and microscopic conductive network at the same time, thereby reducing the content of conductive filler significantly. Furthermore, the deicing experiment manifested that the icicle fell after 29 s at 28 V, much shorter than without loading current. The integrated CNT@EVA/PVDF composite film heater contributes to a better understanding of the low percolation effect and the distribution mechanism between molten EVA and soluble PVDF, which could conduce to the development of novel electro-thermal deicing film in future.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Yange Yu,Wenzhu Shao,Jing Zhong,Huijian Ye,Li Yang,Liang Zhen
Ferroelectric poly(vinylidene fluoride) (PVDF)-based polymer nanocomposites have garnered considerable attention for film capacitor applications. However, the addition of highly polarized inorganic fillers with a large proportion into PVDF leads to poor processability and high energy loss, which significantly destroy the structural integrity of the film and restrain the practical application of film capacitors. Herein, we constructed core–shell BaTiO3 (BTO)@graphene oxide (GO) architectures via an aerosolization method and incorporated them into the PVDF matrix, which not only provided a highly insulating GO layer to improve the breakdown strength and suppress the dielectric loss but also improved the dispersion of fillers to realize a high interfacial interaction. The 0.4 wt % BTO@GO/PVDF film exhibited a high discharged energy density of 2.9 J cm–3 at 200 MV m–1, 70% higher than that of the PVDF film, a charge–discharge efficiency of 86%, and a depressed dielectric loss of 0.07 at 1 kHz. Moreover, the ultralow content of fillers can greatly improve the processability and reduce the defects with the structural integrity as well as the performance stability of the film during stretching. This work sheds light on the improvement of energy storage performance of polymer nanocomposites for film capacitors.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 47
·29527-29536
·
IF 3.361
Lian Sun,Quanchao Gu,Honglei Wang,Jinshan Yu,Xingui Zhou
A high-temperature proton exchange membrane was fabricated based on polyvinylidene fluoride (PVDF) and polyvinylpyrrolidone (PVP) blend polymer nanofibers. Using electrospinning method, abundant small ionic clusters can be formed and agglomerated on membrane surface, which would facilitate the proton conductivity. To further enhance the conductivity, phosphoric acid (PA) retention as well as mechanical strength, sulfamic acid (SA)-doped metal–organic framework MIL-101 was incorporated into PVP-PVDF blend nanofiber membranes. As a result, the anhydrous proton conductivity of the composite SA/MIL101@PVP-PVDF membrane reached 0.237 S cm−1 at 160 °C at a moderate acid doping level (ADL) of 12.7. The construction of long-range conducting network by electrospinning method combined with hot-pressing and the synergistic effect between PVP-PVDF, SA/MIL-101 and PA all contribute to the proton conducting behaviors of this composite membrane.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Membranes
·
2021
·Vol. 11
·期 11
·803
·
IF 4.106
Qianqian Xu,Yuchao Chen,Tonghu Xiao,Xing Yang
The use of poly(vinylidene fluoride) (PVDF) microfiltration (MF) membranes to purify oily water has received much attention. However, it is challenging to obtain high-performance PVDF microfiltration membranes due to severe surface fouling and rapid decline of permeability. This study explored a new approach to fabricate high-performance PVDF/silica (SiO2) composite membrane via the use of a polymer solution featuring lower critical solution temperature (LCST) characteristics and the non-solvent thermally induced phase separation method (NTIPS). Coupling with morphological observations, the membrane formation kinetics were analyzed in depth to understand the synergistic effect between the LCST solution properties and fabrication conditions in NTIPS. Utilizing such a synergistic effect, the transition from finger-like macrovoid pores to bi-continuous highly connected pores could be flexibly tuned by increasing the PVDF concentration and the weight ratio of SiO2/PVDF in the dope solution and by raising the coagulation temperature to above the LCST of the solution. The filtration experiments with surfactant-stabilized oil-water emulsion showed that the permeation flux of the PVDF/SiO2composite membranes was higher than 318 L·m−2·h−1·bar−1and the rejection above 99.2%. It was also shown that the PVDF/SiO2composite membranes, especially those fabricated above the LCST, demonstrated better hydrophilicity, which resulted in significant enhancement in the anti-fouling properties for oil/water emulsion separation. Compared to the benchmark pure PVDF membrane in oily water purification, the optimal composite membrane T70 was demonstrated via the 3-cycle filtration experiments with a significantly improved flux recovery ratio (Frr) and minimal reduced irreversible fouling (Rir). Overall, with the developed method in this work, facile procedure to tune the membrane morphology and pore structure was demonstrated, resulting in high performance composite membranes suitable for oil/water emulsion separation.Keywords:PVDF/SiO2composite membrane;lower critical solution temperature (LCST);nonsolvent thermally induced phase separation (NTIPS);structural control;oil-in-water emulsion
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Yang He,Kexin Xu,Xia Feng,Li Chen,Zhongyi Jiang
Hydrophilic polymer brushes on membrane surfaces can alleviate fouling during the separation of oil/water emulsions; the charged moieties on the polymer brushes presumably interact with charged surfactants and weaken the membrane fouling behaviour. However, the oil-repellence mechanism of nonionic polymer brushes has not been thoroughly examined. In this study, a nonionic poly(N-acryloyl morpholine)-brush-grafted-poly(vinylidene fluoride) membrane (PVDF- g -PACMO) was fabricated via surface-initiated atom transfer radical polymerisation (ATRP) to separate various surfactant-stabilised emulsions. PVDF- g -PACMO membranes with high hydrophilicity and high permeation were successfully fabricated by controlling the duration of ATRP. Furthermore, fouling models of oil/water emulsions stabilised by anionic, nonionic, and cationic surfactants were examined. Multicycle filtration experiments revealed that the anionic surfactant-stabilised emulsions severely fouled the similarly charged PVDF- g -PACMO membranes owing to electrostatic repulsion, whereas the nonionic and cationic surfactant-stabilised emulsions exhibited reduced irreversible fouling. In particular, an unusual relief in irreversible membrane fouling was observed with respect to the cationic surfactant-stabilised emulsions, presumably because of strong demulsification and steric effects (surfactant barrier), which repelled the penetration of oil droplets into the internal pores and averted pore blockage. These observations suggest that oppositely charged surface potentials of the PVDF- g -PACMO membranes compared to that of the oil/water emulsions assist in mitigating irreversible fouling. The mechanisms examined herein described the relationship between the surface properties of the oil/water emulsions and the tendency for irreversible fouling, thereby providing valuable guidance for sustainable separation of oil/water emulsions.
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2021
·
IF 6.158
Fei Sun,Ting-Ting Li,Hai-Tao Ren,Bing-Chiuan Shiu,Hao-Kai Peng,Jia-Horng Lin,Ching-Wen Lou
Oil and organic pollutants removal becomes an efficient solution to dispose of industrial oily and textile dye wastewater. This study proposes a lotus leaf-like bionic nanofibrous membrane with underwater superoleophobic for highly efficient oil-water separation. Papillary structure of the bionic membrane is formed by electrospraying of PVDF and TiO 2 solutions on the surface of beaded-structure PVDF/TiO 2 membrane. Dopamine is then decorated on the resultant PVDF/TiO 2 membrane by in situ polymerization to be with hydrophilic-underwater oleophobic property for highly efficient oil-water separation. This bionic membrane has > 99 % oil-water separation efficiency, and high flux of 1389 ± 67 L m −2 h −1 . Its contact angle of underwater petroleum ether and dichlomethane reaches 155° and 152°, respectively. Moreover, it has excellent water transport capacity, photocatalytic property, as well as high separation efficiency and flux even after 5-cycle filtration. This bionic nanofibrous membrane will become a promising candidate in clean production, industrial oil/water separation, water purification and efficient liquid transmission.
✓ 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）