SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Feiyan Huang,Zhuoting Zhao,Zhiqin Yang,Fang He,Hongguang Sun,Yuexiang Li,Zhenxing Wang
Rare earth mining produces a large amount of acidic oily wastewater, which causes serious environmental pollution. Developing an acid-resistant oil–water separation membrane is an effective way to solve the above problems. In this work, we successfully construct a protein-induced silica coating on polyvinylidene fluoride (PVDF) membrane with the aid of adhesion protein for highly efficient separation of acid emulsion. The obtained coating is composed of ovalbumin (OVA), tannic acid (TA), TiO 2 , and SiO 2, which can endow the PVDF membrane with excellent underwater superoleophobicity and desirable acid resistance. Moreover, the modified membrane has excellent anti-oil-adhesion property, which can keep withstand fouling even an oil droplet is continuously squeezed into the membrane for 2 h under acidic conditions. The outstanding anti-oil-adhesion property is due to the bound water of the multilayer coating, which is confirmed by low field-nuclear magnetic resonance (LF-NMR). The flux recovery can reach up to 98 % and oil rejection rate can reach up to 99.7 % toward strongly acidic emulsion. In addition, the multilayer coating also possesses good stability, which can withstand ultrasonic treatment and washing. Considering the mild preparation process without expensive/complex equipment and the desirable performance, this strategy may become a powerful tool for preparing acid-resistant membranes for efficient treatment of acidic emulsion.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 7
·4268-4277
·
IF 2.779
You Yan-bin,Wang Hai-yan,Li Lan,Bai Lin-rui,Dang Zhi-Min
In order to improve the dielectric properties and the thermal conductivity of the PVDF-based composites, the BaTiO 3 @super-short MWCNT (BT@SSCNT) particles were modulated by a SSCNT shell fabricated by MWCNT with the different types (S-MWCNT-1020, S-MWCNT-2040). The average size of these particles is about 300 nm. With the increase in the external diameter of MWCNT, the SSCNT content of the BT@SSCNT particles decreases. However, the sum proportions of which the diameter of the particles is not less than 295 nm have a distinct growth leading to that the distance between the neighboring particles shortens. The dielectric constants of the composites are more than 355 and 1500 (10 3 Hz) at 10 wt% and 60 wt% filler loading, respectively. Compared with the BT@SSCNT/PVDF-1020 composites, the dielectric constants of the BT@SSCNT/PVDF-2040 composites have a more stable frequency dependency in the range of 10 2 to 10 6 Hz. The value of the composite with 10 wt% BT@SSCNT loading maintains more than 250 at 10 6 Hz. The introduction of the shell of SSCNT with larger external diameter can offer the composites a more desirable combined action of dielectric mechanisms, including interfacial polarization and micro-capacitor effect. In addition, the varying SSCNT shells also have evident influence on dielectric loss, breakdown strength, and thermal conductivity. It is worth mentioning that the values of the BT@SSCNT/PVDF-2040 composites are 334 and 0.16 (10 4 Hz), 229 kV mm −1 , and 1.13 W (m K) −1 at 10 wt% filler loading, respectively. This work could extend the strategies for building the core–shell particles to develop dielectric nanocomposites.
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高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Lian Yang,Haoran Qiu,Lijun Zhao,Ping Xiao,Guoliang Liu,Jiang Chang,Tianbei Zhang,Shaoxia Yang,Feng Xiao
Polyvinylidene fluoride (PVDF)-N-isopropylacrylamide (NIPAM)-Graphene oxide (GO) (PNG) membrane can dramatically change their microstructure and performance in response to temperature variations in raw water. However, the research on the effect of responsible temperature and individual component in this membrane is lack of clarity. In this study, the permeability-selectivity index was established to determine the responsible temperature of the PNG membrane at 35 °C (PNG-35). And the biofilter effluent from Beijing wastewater reclamation treatment plant was used to investigate the contribution of each composition in the PNG membrane. It can be noticed that with the addition of GO could increase the permeability 23.33 %，while selectivity increased 15.05 %. After the further introduction of NIPAM, subsequently the permeability could increase 82.86 % with the selectivity increased 11.35 %. Finally, comparing the effluent of membrane by EEM, molecular weight distribution and FTICR-MS, the results showed that the humic-like substances were the main contaminants with molecular weights of 142 Da, 397 Da, and 1147 Da, characterized by their sulfur content, hydrophilicity, and negative charged. Humic-like substances were the main contaminants which the sequence of removal was PNG-35 > PNG > PG > PVDF. Apparently, the adding of GO, NIPAM and the responsible temperature could improve the removal of humic-like substances that attributed to the R ir decreased the value at 0.201, 0.092 and 0.041. And charge effects between the contaminants and membrane surface played a significant role under the responsible temperature.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2020
·Vol. 27
·期 3
·1-11
·
IF 2.426
Du Chunhui,Zhang Xinyi,Ma Xumin
In order to obtain the tunable and charged surface of the membranes, polymerized ionic liquid(PIL) block copolymers poly (methyl methacrylate) (PMMA)-b-poly(1-[(2-methacryloyloxy)ethyl]-3-butylimidazoliumbromide) (PMEBIm-Br) with different poly(ionic liquid) brush lengths were synthesized by RAFT polymerization method and used in the fabrication of poly(vinylidene fluoride) blend membranes. Chemistry analysis confirmed the successful copolymerization of P(MMA-b-MEBIm-Br) with different chain lengths of PMEBIm-Br blocks, and the PIL groups was also detected on the surface of the blend membranes, which contributes to the hydrophilic and positively charged surface of the membrane. These properties were further enhanced by the chain length of PMEBIm-Br blocks in the copolymer. The surface wettability of the membranes can be regulated from hydrophilicity to hydrophobicity by anion exchange, and the water flux changes also confirmed these phenomena. In addition, the effects of PMEBIm-Br blocks on the separation properties of the membranes were investigated using two dyes, namely, orange G and rhodamine 6G. Results indicated that the blend membranes with long length of PMEBIm-Br blocks had high rejection and good antifouling property to rhodamine 6G. Furthermore, the adsorption experiment of the blend membranes to the two dyes also indicated that blend membranes with long length of PMEBIm-Br blocks would have good dye adsorption-separation property.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Lei Teng,Chuan Yue,Ganwei Zhang
Epoxied SiO 2 nanoparticles and polyethyleneimine (PEI) was used to coating polyvinylidene fluoride (PVDF) membrane for improved anti-fouling, oil water separation , dye and heavy metal ions removal capabilities. Characterization of the modified membrane revealed that the hydrophilic coating layer was applied onto the PVDF substrate successfully. The modified membrane can exhibit a high degree of superhydrophilicity and underwater superoleophobicity. Consequently over 98% of the oil was retained when this membrane was used in oil water separation. The hydrophilic coating layer enhanced the membrane antifouling performance, and its flux recovery rate reached 96.3% after filtration and washing with bovine serum protein solution (BSA). In addition, the modified membrane presented the ability to adsorb organic dyes and heavy metal ions in water and reject them via filtration. Most importantly, the crosslinking reaction between the epoxied SiO 2 nanoparticles and PEI imparts a high degree of stability to the coating layer. Thanks to the simple fabrication method and multifunctional performances of the coating layer described in this report, it may be used to modify other substrates.
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高影响因子
Journal of Industrial Textiles
·
2020
·
IF 2.01
Hongbin Li,Wenying Shi,Qiyun Du,Shoufa Huang,Haixia Zhang,Rong Zhou,Xiaohong Qin
Although membrane distillation (MD) technology has the outstanding advantages of almost 100% solute retention and mild operation conditions, its further development is limited by low permeate flux. In order to solve the problem, the improvement of membrane hydrophobicity becomes one of the effective solutions. In this study, a loose and porous hydrophobic zeolitic imidazolate frameworks-71 (ZIF-71)/polyvinylidene fluoride (PVDF) coating layer was composited on the outside surface of PVDF hollow fiber support membrane by the dilute solution coating to enhance membrane hydrophobicity. The prepared hollow fiber composite (HFC) membranes were employed to remove high concentration Congo red (CR) through VMD. The effects of different operation conditions including the dye concentration, feed temperature, vacuum pressure and feed flow rate on CR rejection and permeate water flux were investigated. In the variation range of operating conditions, all the CR rejection of the PVDF HFC membranes shows a slight change and remains above 99.9%. Under the optimal operation conditions including dye concentration 600 mg·L−1, vacuum pressure 31.325 kPa, feed temperature 60°C and feed flow rate 50 L·h−1, HFC membrane exhibit a permeate water flux of 13.15 kg·m−2·h−1. HFC membrane suffers dye fouling during the continuous dye filtration for 100 h. The fouling mechanism was proposed and a combined cleaning way including forward washing, back flushing and chemical desorption has been proved to be effective in recovering membrane water flux.
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高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Xing Yan,Minjie Li,Dongjie Liao,Jianquan Jing,Jiao Chen,Jiechao Wang,Mianji Qiu,Chuanhao Xu,Jingyu Wang,Chongwei An
Surface coating is an important method to solve the poor stability of aluminum hydride (AlH 3 ). To overcome the difficulty of uneven coating of fluorine-containing polymers on the surface of AlH 3 , this study utilizes the adhesion properties of polydopamine (PDA) to establish a bridge between the oxide layer of AlH 3 (Al 2 O 3 ) and polyvinylidene fluoride (PVDF), so that Polyvinylidene fluoride (PVDF) was uniformly coated on the AlH 3 surface, and a dual-core shell structure AlH 3 @PDA@PVDF composite was successfully prepared. Molecular dynamics simulations reveal significantly higher binding energy per unit area for γ-Al 2 O 3 @PDA/PVDF (1.2270 Kcal·mol −1· Å −2 ) compared to γ-Al 2 O 3 /PVDF (0.6644 Kcal·mol −1· Å −2 ), affirming that PDA can effectively enhance the interfacial interaction between AlH 3 and PVDF. The morphology characterization and performance testing of raw AlH 3 and AlH 3 @PDA@PVDF composite were carried out through SEM, XPS , FT-IR, DSC , VST, etc. The results indicate that through the interface modification of AlH 3 by PDA, PVDF with a hydrophobic surface can be evenly coated on the surface of AlH 3 , causing the water contact angle (WCA) of the AlH 3 @PDA@PVDF composite to increase from 41° for the raw AlH 3 to 124°. Furthermore, the total decomposition time of the AlH 3 @PDA@PVDF composite (2326 min) is improved by 1.8 times than that of the raw sample (1277 min), and its apparent activation energy (117.75 kJ·mol −1 ) was also higher than that of the raw sample (99.88 kJ·mol −1 ), indicating that coating with PDA and PVDF can improve the stability of AlH 3 . Ignition experiments demonstrate that the AlH 3 @PDA@PVDF composite has superior ignition reaction performance compared with the raw AlH 3 . Especially, adding a small amount of AlH 3 @PDA@PVDF composite can also significantly catalyze the thermal decomposition process of ammonium perchlorate (AP), reducing its high-temperature decomposition temperature from 405.37 °C to 352.20 °C.
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高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2026
·
IF 3
Xuemin Jing,Qianqian Liu,Xingyu Shi,Ziyi Sun,Zhenghui Liu,Zhenyang Li,Na Ni,Yu Chen
Polyvinylidene fluoride (PVDF) based polymer solid electrolytes are crucial plastic components in all-solid-state lithium-ion batteries (ASLIBs). However, the large-scale application of PVDF-based solid electrolytes without proper treatment will cause persistent environmental contamination and resource waste, thus highlighting an urgent need for effective recovery strategies. Herein, we firstly propose a hydrogen bond-driven strategy with ultrasonic assistance for ultrafast and eco-friendly recovery of PVDF nanoplastic from polymer solid electrolytes of ASLIBs. Utilizing the proposed hydrogen bond-driven strategy, a maximum F leaching efficiency of 98.2% from PVDF nanoplastic can be attained within a short timeframe and under mild conditions using eco-friendly solvents. Compared with traditional methods, ultrasonic treatment exhibits a significantly improved leaching efficiency of approximately 88%. This ultrafast recovery and notable enhancement can be attributed to the breakdown of C–F bonds in PVDF, which is realized by regulating hydrogen bond networks in green solvents combined with ultrasonic treatment. This study presents a novel strategy for the green, rapid and significantly enhanced recovery of PVDF nanoplastic from spent polymer solid electrolytes of ASLIBs.
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PubMed
高影响因子
Membranes
·
2021
·Vol. 11
·期 12
·951
·
IF 4.106
Xiaoji Zhou,Yizhuo Sun,Shusu Shen,Yan Li,Renbi Bai
In this study, a triple-component copolymer of P(Stx-co-MAAy)-g-fPEGzcontaining hydrophobic (styrene, St), hydrophilic (methacrylic acid, MAA), and oleophobic (perfluoroalkyl polyethylene glycol, fPEG) segments was synthesized and used as an additive polymer to prepare modified PVDF membrane for enhanced anti-fouling performance. Two compositions of St:MAA at 4:1 and 1:1 for the additive and two blending ratios of the additive:PVDF at 1:9 and 3:7 for the modified membranes were specifically examined. The results showed that the presence of the copolymer additive greatly affected the morphology and performance of the modified PVDF membranes. Especially, in a lower ratio of St to MAA (e.g., St:MAA at 1:1 versus 4:1), the additive polymer and therefore the modified PVDF membrane exhibited both better hydrophilic as well as oleophobic surface property. The prepared membrane can achieve a water contact angle at as low as 48.80° and display an underwater oil contact angle at as high as 160°. Adsorption experiments showed that BSA adsorption (in the concentration range of 0.8 to 2 g/L) on the modified PVDF membrane can be reduced by as much as 93%. From the filtration of BSA solution, HA solution, and oil/water emulsion, it was confirmed that the obtained membrane showed excellent resistance to these organic foulants that are often considered challenging in membrane water treatment. The performance displayed slow flux decay during filtration and high flux recovery after simple water cleaning. The developed membrane can therefore have a good potential to be used in such applications as water and wastewater treatment where protein and other organic pollutants (including oils) may cause severe fouling problems to conventional polymeric membranes.Keywords:a triple-component copolymer additive;modified PVDF membrane;hydrophilic and oleophobic surface property;low protein and organic fouling
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PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Xiaoyu Bai,Peng Liu,Xingtong Gao,Kai Liu,Aixiang Li,Zijian Lyu,Qiuhong Li
It is a major obstacle to further development of membrane technology that membrane fouling occurs. In this study, a novel Fe 3 O 4 @UiO-66-NH 2 /PVDF-co-CTFE mixed matrix membrane was successfully developed by mixing Fe 3 O 4 @UiO-66-NH 2 nanoparticles (NPs) into PVDF-co-CTFE membrane through a simple non-solvent-induced phase separation (NIPS) method, and was used for degradation of organic wastewater. The results of the incorporated Fe 3 O 4 @UiO-66-NH 2 NPs content on the morphology, pore structure and physicochemical structure of samples were investigated systematically. The results indicated that the Fe 3 O 4 @UiO-66-NH 2 NPs addition in membrane matrix improved the permeability and significantly enhanced the anti-fouling performance. When 2 wt% Fe 3 O 4 @UiO-66-NH 2 NPs was added, the mixed matrix membrane had excellent comprehensive performance, maintaining a high pure water flux of 226.8 L m −2 h −1 , the BSA rejection rate reached 95.9%, and the flux recovery rate was 71.38%. Importantly, the membrane possessed high catalytic performance based on the Fenton reaction mechanism, and the removal rate of 20 mg L −1 MB solution (400 mL) was up to 99.04%, and showed excellent self-cleaning characteristics and long-term stability. In conclusion, this study provided a new idea for the development of Fenton catalytic membranes with excellent anti-fouling performance for wastewater treatment in complex environments.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zheng Zhang,Jinfeng Zhang,Zhihua Zhang,Xiao Du,Xiaogang Hao,Xiaowei An,Guoqing Guan,Jun Li,Zhong Liu
A novel physically blended polyvinylidene fluoride (PVDF) and polyacrylic acid (PAA) composite binder enhanced LiMn 2 O 4 /C (carbon black) film based electrode was successfully fabricated, and applied in an electrochemically switched ion exchange (ESIX) process for selective extraction of Li + from high Mg/Li ratio brine. The multifunctional composite binder system enabled the obtained LiMn 2 O 4 /C/PVDF- b -PAA film coated electrode to exhibit superior mechanical, hydrophilic and electrochemical properties compared with the LiMn 2 O 4 /C/PVDF film coated electrode. Based on the density functional theory (DFT) calculations, the ion exchange interaction between H + of –COOH groups in PAA and Li + facilitated the transport of Li + at the electrode interface, which enhanced lithium extraction performance of the film coated electrode. For treating the simulated brine (Mg/Li: ∼500), the intercalation capacity of Li + was about 15.1 mg g −1 , and the total extraction efficiency of lithium reached up to 62.8% after two electrochemical intercalation tests. Moreover, the film coated electrode displayed excellent selectivity towards Li + ions even in pre-treated actual brine (Mg/Li: ∼292.2). The Mg/Li mass ratio in the recovery solution could decrease to 0.46, and the calculated Li + /Mg 2+ separation coefficient reached as high as 631.08. In particular, the highly stable and scalable electroactive film could be prepared effectively, thus increasing its applicability. It is expected that such a LiMn 2 O 4 /C/PVDF- b -PAA film coated electrode could be a promising candidate for the selective extraction of Li + from high Mg/Li mass ratio brines.
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高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2020
·Vol. 305
·期 4
·1900835
·
IF 3.853
Yi Yang,Ling-yan Li,Bo Yin,Ming-bo Yang
Conductive composites based on polymers and conductive nanofillers are widely studied as a promising material. The rational design of 3D conductive networks in composites is crucial to improve their electrical conductivity and reduce the dosage of nanofillers. Herein, poly(vinylidene fluoride) (PVDF) and polystyrene (PS) bi-continuous structures with modified carbon nanotubes (CNTs) tailored to anchor at the interface are designed to achieve an ultralow electrical percolation threshold because of the formation of a thin interfacial conductive layer. In this work, the modification of CNTs with poly(methyl methacrylate) (PMMA), which contributes to the improvement of the compatibility between PVDF and CNTs, is effective to control the distribution of CNTs in composites. It promotes the migration of CNTs from the PS phase to the interface of PVDF and PS. Consequently, the interfacial conductive layer is formed at a low CNT content, and the electrical percolation threshold of PVDF/PS/CNTs-PMMA nanocomposites is only 0.07 vol%, having a great decrease of about 50% compared with that of PVDF/PS/CNTs nanocomposites. Thus, it is demonstrated that the distribution of CNTs can be tailored to anchor at the interface by proper chemical modification to form an interfacial conductive layer and a decrease of percolation threshold can also be achieved.
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高影响因子
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