CHEMICAL PAPERS
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2023
·
IF 2.2
Hong Ye,Yu Kanping
Cotton-based clothing fabrics are welcome because they are warm, close-fitting, hygroscopic and breathable. However, surface hydrophilic hydroxyls will make them easy to stick to stains. High-cost preparing of inorganic nanoparticles can favor a building of hydrophobic coatings for them. To cheaply attain surface self-cleaning attributes of cotton-based fabrics, here, all-organic surface coatings were established utilizing surface-fluorinated uninjured polyglycidyl methacrylate (PGMA)/polyvinylidene fluoride (PVDF) co-modifying. High PVDF dosage incurred a large water contact angle (WCA) of treated fabric, and high hydrophilic attribute of pristine fabric was altered into high hydrophobic one. Antifouling attribute was acquired on the surfaces of treated fabrics, and effective ultraviolet (UV) and wearing resistances of the optimal coating/fabric composite with feeding 10 wt% of PVDF were fulfilled. The optimal fabric surface demonstrates a superhydrophobic attribute (WCA at 153.5 ± 1.5°). After UV irradiating for 24 h or surface abrasion for 100 cycles, this surface demonstrates a WCA surpassing 140° with a water sliding angle below 16°. The fiber weaving constitution and surface F assembling are critical for performance optimizing. The current research may give an effective route for large-area producing of self-cleaning cotton-based fabrics.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yunyun Wang,Haonan Ruan,Jing Zhang,Ying Huang,Mengyue Guo,Dandan Kong,Jiaoyang Luo,Meihua Yang
The indiscriminate application and abuse of the broad-spectrum fungicide dimethomorph (DMM) not only causes serious residues on agricultural products, which indirectly endangers human health, but also directly harms aquatic organisms through the persistence of water pollution. In the present study, the integration of eco-friendly membrane technology and highly selective molecular imprinting technology was facilitated through the introduction of polydopamine (PDA) biomimetic technology, which promoted the elimination of DMM and held great significance for food safety and environmental protection. Herein, the fabrication process involved the initial preparation of PDA modification on the polyvinylidene fluoride (PVDF) membrane surface, followed by the modification of molecularly imprinted polymer (MIP) with DMM as a template molecule to obtain a specific adsorbed membrane material (PVDF@PDA@KH570@dualMIP membrane, dMIM) for DMM. The physical properties and chemical feature of the developed dMIM were investigated using various characterization techniques, and the preparation parameters were optimized. Ultimately, the superior adsorption capacity (maximum capacity, 314 μg/cm 2 ) and adsorption selectivity of dMIM has been successfully achieved, alongside excellent reusability (number of cycles, 5 times). Moreover, in terms of practical application, the prepared dMIM demonstrated remarkable efficacy in eliminating DMM, with removal efficiencies in tap water ranging from 74.43 % to 86.12 % for three residual concentrations, and 90.71 %–95.67 % in Panax notoginseng aqueous extracts at three material-to-liquid ratios, while had little impact on the quality of the extracts. We believe that this strategy provides a new insight into the design of novel adsorption materials for the selective elimination of DMM in environmental water and complex food matrix.
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Erwei Tan,Wenjie Peng,Qihou Li,Ding Wang,Xinhai Li,Jianguo Duan,Huajun Guo,Guochun Yan,Jiexi Wang,Zhixing Wang
Polyethylene oxide (PEO)-based electrolytes are considered to be promising for all-solid-state battery, benefiting from the superior flexibility, excellent processability and well compatibility. However, the low ionic conductivity at room temperature and poor stability under high voltage limit their further application. Herein, ZIF-8@PVDF-HFP/PEO (PPZ) solid electrolyte was successfully prepared by facial electrospinning process. On one side, the cooperation of PVDF-HFP and ZIF-8 was benefit to decrease the crystallization degree of PEO and thus promoted the Li + transfer. Moreover, the in-situ formed LiF layer derived from the decomposition of PVDF-HFP protected the electrolyte from contacting directly with the electrode, contributing to a stable electrode/electrolyte interface. The results demonstrated that the electrochemical stability and mechanical property of PPZ electrolyte were significantly improved when compared to the bare PEO electrolyte. The tensile strength increased from 0.5 to 6.7 MPa and the Li + transference number enlarged from 0.17 to 0.48. More importantly, the assembled LCO(LiCoO 2 )||PPZ||Li all-solid-state battery delivered a discharge specific capacity of 144.7 mAh g -1 at 0.2 C, nearly 1.6 times than that of the LCO||PEO||Li (90.7 mAh g -1 ). Besides that, the retention maintained at 86.3 % even after 200 cycles, manifesting a long-term cycling stability. This work provides a new idea for the practical application of PEO under high voltage.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Zongjie Li,Shuye Wang,Xinhui Wang,Xiaobin Sun,Weimin Kang,Yong Liu
The development of membrane with strong sunlight absorption and high energy efficiency is the key to improve the water production efficiency in photothermal membrane distillation (PMD). In this paper, a hierarchical Cu-based metal–organic framework-functionalized polyvinylidene fluoride (PVDF) tree-like nanofiber membrane (Cu-CAT@TLNM-TLNMs) was developed for high-efficient PMD. The Cu-CAT@TLNM-TLNM was prepared by in-situ growth of Cu-CAT on the surface of PVDF tree-like nanofiber membrane (TLNM) as photothermal layer and PVDF TLNM as support layer, which exhibited excellent photothermal conversion performance, high energy utilization and high permeate flux. The PVDF TLNM with high specific surface area provided more active sites for the growth of Cu-CAT, thus forming a uniform Cu-CAT nanoarray. The spinous structure of the Cu-CAT photothermal layer can increase the length of the light-matter interaction and improve light absorption. In addition, the tree-like structure of the support layer with high porosity and small pore size can improve the permeate flux and long-term stability. Under the illumination of 1 kW·m −2 , the surface temperature of the Cu-CAT@TLNM-TLNMs reached about 80 °C within 50 s, with a permeate flux of 1.37 kg·m −2 ·h −1 , a salt rejection of >99.99 %, and a photothermal conversion efficiency of 76 %. More importantly, the permeate flux of the Cu-CAT@TLNM-TLNMs was still stable at 0.79 kg·m −2 ·h −1 with a salt rejection of >99.99 % after 84 h of continuous operation. This photothermal nanofiber composite membrane can be applied to solve the problem of freshwater shortage in areas where freshwater and fuel resources are scarce and solar energy is abundant.
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CARBOHYDRATE POLYMERS
·
2023
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IF 11.2
Hongxu Liu,Junhao Xie,Ziyi Hu,Jingxuan Zhao,Ruijia Wang,Yuchao Qi,Shulin Sun
This work obtained separation membranes with UV-cleaning performance by adding TiO 2 -g-CS/CNTs photocatalyst to the PVDF . The positively charged chitosan (CS) and negatively charged carboxylic carbon nanotube (CNTs-COOH) can be self-assembled into the bilayer structure on the surface of TiO 2 particles through electrostatic attraction. The presence of many hydrophilic groups in CS and CNTs-COOH significantly improves the hydrophilicity of TiO 2 -g-CS/CNTs-PVDF membrane, and helps TiO 2 to be uniformly dispersed on the upper surface. TiO 2 -g-CS/CNTs promote the change of pore structure and expand the flux of the modified membrane to 4.5 times that of pure PVDF . Zeta potential demonstrates that the TiO 2 -g-CS particles successfully attracted CNTs in the PVDF matrix, and the membrane surface was still positively charged. Thus, the combined effect of the positively charged TiO 2 -g-CS and the highly adsorbed CNTs enhanced the retention of the contaminants. More importantly, there is a charge transfer between the grafted CS and TiO 2 interface to obtain a broader light absorption band. The excitation carriers provided by CNTs significantly contribute to the photocatalytic performance after transfer between TiO 2 and CS; thus, TiO 2 -g-CS/CNTs-PVDF produces higher photocatalytic activity for dye molecules (degradation rate > 97 %).
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Membranes
·
2023
·Vol. 13
·期 10
·807
·
IF 4.2
Yixia Zhao,Zehao Zhang,Yan Zhang,Yuting Huang,Yanfei Chen,Bofei Chen,Weimin Kang,Jingge Ju
Recently, the multi-level interwoven structured micro/nano fiber membranes with coarse and fine overlaps have attracted lots of attention due to their advantages of high surface roughness, high porosity, good mechanical strength, etc., but their simple and direct preparation methods still need to be developed. Herein, the multi-level structured micro/nano fiber membranes were prepared novelly and directly by a one-step electrospinning technique based on the principle of micro-phase separation caused by polymer incompatibility using polystyrene (PS) and polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) as raw materials. It was found that different spinning fluid parameters and various spinning process parameters will have a significant impact on its morphology and structures. Under certain conditions (the concentration of spinning solution is 18 wt%, the mass ratio of PS to PVDF-HFP is 1:7, the spinning voltage is 30 kV, and the spinning receiving distance is 18 cm), the PS/PVDF-HFP membrane with optimal multi-level structured micro/nano fiber membranes could be obtained, which present an average pore size of 4.38 ± 0.10 μm, a porosity of 78.9 ± 3.5%, and a water contact angle of 145.84 ± 1.70°. The formation mechanism of micro/nano fiber interwoven structures was proposed through conductivity and viscosity tests. In addition, it was initially used as a separation membrane material in membrane distillation, and its performance was preliminarily explored. This paper provides a theoretical and experimental basis for the research and development of an efficient and feasible method for the preparation of multi-level micro/nano fiber membranes.
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Journal of Water Process Engineering
·
2023
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IF 7
Hao Jiang,Longfei Zhang,Chuntao Zhang,Xiaoming Xiao,Zhizhang Tian,Yongli Sun
Integrating the heterogeneous catalysts with the membrane matrix is a promising approach for wastewater decontamination . In this study, a ZIF-67 derived cobalt‑manganese spinel catalyst MnCo 2 O 4.5 @Carbon (MCOC) was prepared using a one-pot pyrolysis process and was then blended with a polyvinylidene fluoride (PVDF) membrane through the phase inversion method. The introduction of the MCOC catalyst not only improved the permeance of the membrane but also constructed active reaction sites within the membrane matrix. As a result, the PVDF/MCOC membranes exhibited both satisfactory degradation capabilities by activating peroxymonosulfate and favorable permeation performance. Remarkably, about 99 % of phenol (20 mg/L) can be removed within 30 min, with a water flux of 649.0 L/m 2 ∙h. Besides, the PVDF/MCOC catalytic membrane possessed favorable anti-fouling properties and stability. The flux recovery rate of the PVDF/MCOC membrane reached 85 % after three fouling/washing cycles, while the phenol removal efficiency remained consistent at 95 % after 5 consecutive cycles. Radical quenching tests and electron paramagnetic resonance analysis further indicated that sulfate radicals and singlet oxygen were the primary reactive oxygen species in the phenol degradation processes. Consequently, this work highlights an effective method to fabricate a catalytic membrane with high permeance and catalytic efficiency, potentially expanding the application of heterogeneous catalysts in wastewater decontamination.
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Membranes
·
2023
·Vol. 13
·期 9
·773
·
IF 4.2
Jun Xiang,Sitong Wang,Nailin Chen,Xintao Wen,Guiying Tian,Lei Zhang,Penggao Cheng,Jianping Zhang,Na Tang
In order to enhance the separation performance and reduce the heat loss of transmembrane for membrane distillation, the thermal efficiency and hydrophobicity of the membrane distillation need to be simultaneously enhanced. In this work, a polyvinylidene difluoride/polyethylene glycol terephthalate (PVDF/PET) hydrophobic/hydrophilic membrane has been prepared by non-solvent phase induction method. Nanosized silica aerogel (SiAG) with high porosity has been added to the composite membranes. The modifying effects and operating conditions on permeate flux and thermal efficiency in direct contact membrane distillation (DCMD) are investigated. Furthermore, the latent heat of vaporization and the heat transfer across the membranes have been compared for SiAG addition, which indicates that the composite PVDF@SiAG/PET membranes demonstrate a great potential for distillation-separation application due to their high heat efficiency.Keywords:non-solvent induce phase separation;hydrophobic/hydrophilic membrane;silica aerogel;low thermal-conductivity;membranes distillation
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 33
·11441-11450
·
IF 4
Defeng Hu,Zhongqiao Sun,Yide Han,Hao Meng,Xia Zhang
Considering the surface affinity of MOFs and separation advantages of polymer membranes, herein, a one-step interface synthesis strategy is used in the construction of Cu-BTC/PVDF hybrid membranes, in which Cu2+ ions and 1,3,5-benzenetricarboxylic acid (H3BTC) were dissolved in ionized water and n-octanol separately, and polyvinylidene fluoride (PVDF) films were laid at the interface of two immiscible solvents. As a result, Cu-BTC was generated and readily self-assembled inside the PVDF films. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA) and the Brunauer–Emmett–Teller (BET) method were used to characterize Cu-BTC/PVDF hybrid membranes, and Congo red (CR) was selected as the target dye to evaluate the surface adsorption activity of the hybrid membranes. Batch adsorption tests under various conditions were conducted to optimize the adsorption capacity, adsorption kinetics, isotherms and thermodynamics, which were analyzed to further explore the adsorption behavior. Based on this, the adsorption mechanism was discussed. It is worth noting that because of the π–π stacking interaction and hydrogen bonding, an extraordinary adsorption capacity of CR was achieved, and the good separation advantage and the cyclic adsorption performances endow the resulting Cu-BTC/PVDF hybrid membranes with promising applications in the removal of organic dyes from practical wastewater.
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Materials
·
2023
·Vol. 17
·期 1
·9
·
IF 3.4
Runkai Zhou,Hong Yang,Lianzhong Zhao,Chun Wang,Chaoqun Peng,Richu Wang,Dou Zhang,Xiaofeng Wang
In this study, polyvinylidene fluoride (PVDF) composite films were prepared by fused deposition modeling, and the effects of ionic liquid (IL) content on the printability, crystallization behavior, and electrical properties of melted PVDF were systematically investigated. The results show that the addition of IL increased the temperature sensitivity of melted PVDF and decreased its viscosity, while IL acted as a plasticizer to lower the melting point of PVDF and improve its FDM printability. The imidazole cations in IL had electrostatic interactions with the -CF2- groups in PVDF, which promoted the transformation of the nonpolar phase to the polar phase in PVDF; thus, the addition of IL was beneficial to the increase in the polar β phase. The PVDF with 20 wt.% IL contained the highest proportion of β phase content (32.59%). Moreover, the increase in polar β-phase content also increased the polarization strength of PVDF and improved its ferroelectric properties. PVDF with 10 wt.% IL had the highest residual polarization strength (16.87 μC/m2).Keywords:PVDF;3D printing;ionic liquids;piezoelectric materials;fused deposition modeling
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Journal of Water Process Engineering
·
2023
·
IF 7
Mengmeng Liu,Jianqiang Wang,Yajie Ding,Yong Zhou,Fu Liu
Viscous oil separation and its highly efficient recovery is a great challenge in oil/water separation applications. Membrane separation was considered as a prospective strategy for oil/water separation, but membrane contamination caused by the oil droplets restricted its applications significantly. We here propose a nondispersive solvent extraction strategy to efficiently recover viscous lubricant oil from emulsions via a polydopamine modified PVDF Janus membrane . The incorporated thin polydopamine layer facilitates the adsorption and diffusion of surfactant stabilized oil droplets through the membrane. We studied the influence of polydopamine coating time, the flow rate on both feed and extraction sides, the weight content of lubricant oil on the recovery of oil. The optimized membrane exhibited a 10 h accumulative flux (1595 g·m −2 ) for viscous lubricant oil in water emulsion, which was 70 % higher than the contrast PVDF membrane. The current study might significantly advance application of this novel method for highly efficient separation and recovery of viscous oils from oil/water mixtures.
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RSC Advances
·
2023
·Vol. 13
·期 28
·19002-19010
·
IF 3.9
Han Runlin,Wang Chaoyue,Bi Congcong,Wang Hanli
Polyvinylidene fluoride (PVDF) has been widely studied and applied in separation membranes due to its high thermal and chemical stability and mechanical strength. However, PVDF has strong hydrophobicity, resulting in easy contamination of the membrane surface and fast flux attenuation, so it is necessary to modify the membrane surface to improve its separation selectivity and service life. In this paper, PVDF microporous membrane was used as the matrix material and graphene oxide (GO) as the separation layer material. The GO/Mn3O4/PVDF composite membrane was prepared by layer self-assembly of GO nanosheets, and the functional layer spacing was adjusted by nanometer Mn3O4 intercalation. The prepared composite membrane showed high flux and separation selectivity in the filtration of organic compounds. The results showed that the rejection of methylene blue increased from 34% to 99.5%, and the flux decreased from 3000 L m−2 h−1 to 95 L m−2 h−1 when GO nanosheets covered the PVDF supporting membrane. After the introduction of Mn3O4 nanowires in the GO interlayer, the dye rejection reached 99.9% and the flux reached 612 L m−2 h−1. Compared with the unintercalated composite membranes, the flux of the prepared composite membranes showed good stability in the treatment of methylene blue, and the rejection remained unchanged.
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