PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2022
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IF 7.926
Jinjuan Xue,Meng Yuan,Jiamin Gao,Zewu Zhang,Mingxin Wang,Shuaishuai Ma
In this work, a novel PCN-222 metal−organic framework based multitasking membrane was developed for separation of emulsified oils as well as photo-Fenton degradation of refractory aromatic pollutants and inactivation of pathogenic bacteria in water. Fe(III)@PCN-222 nanorods were prepared via impregnation method and subjected to amino-modification, and then robustly anchored on polydopamine (PDA) decorated PVDF membrane via catechol-amine reaction. The as-prepared N-Fe(III)@PCN-222/PDA/PVDF composite membrane exhibited underwater superoleophobicity, and showed high separation efficiency (above 99.4 %) as well as relatively favorable permeation flux (874.9–1592.3 Lm −2 h −1 ) in the separation of emulsified oils ranged from nanoscale to microscale from water. Meanwhile, the membrane serving as a recyclable photo-Fenton platform showed an extensive degradation capacity towards aromatic contaminants and high inactivation activity against bacteria under visible light. The grafted Fe(III) is used as an electron acceptor to promote the separation of photo-generated charge carriers, adjusted the band structure to shorten the bandgap value, and can be reduced to Fe(II) by photo-generated electrons as a Fenton-like catalyst. The photo-Fenton mechanism was studied in detail from the aspects of photoelectric properties, band structure and reactive oxygen species . This work could promote the application of PCN subclass MOFs based superwetting membrane as a recyclable platform for complex wastewater treatment .
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Jingxuan Zhao,Hongxu Liu,Peng Xue,Yuchao Qi,Ziwei Lv,Ruijia Wang,Yucheng Wang,Shulin Sun
In the process of removing dye wastewater, the membrane surface is susceptible to contamination, resulting in reduced performance and limited dye separation efficiency. A single hydrophilic modification layer is not enough to achieve effective separation of different types of dyes. The present research designed a "double layer protection" method in order to overcome the above deficiencies. A solution of dopamine (DA) coated carbon nanotubes (CNTs-COOH) was covered on the surface of the polyvinylidene fluoride (PVDF) membrane by deposition, followed by grafting a layer of chitosan (CS) polymer brushes on its surface. The spatial double layer structure provides an excellent barrier effect and effectively reduces the contamination of dyes. When filtering different types of dyes, effective filtration of anionic and cationic dyes through the electrostatic effect of the first layer, the adsorption of CNTs in the second layer and the hydration layer of both layers. All membranes have excellent rejection properties. More importantly, the membranes also had good chemical and mechanical stability and their serviceability was not degraded. Therefore, the prepared PVDF-based multi-layer composite membranes behave a potential application prospect in the wastewater purification field.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2023
·Vol. 98
·期 12
·2992-3003
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IF 3.4
Mohammed Karama Alsebaeai,Abdul Latif Ahmad,Boon Seng Ooi
BACKGROUND Membrane distillation (MD) is considered a viable technology to overcome the issue of water scarcity by desalination of seawater. However, the application of MD has been severely restricted by membrane-wetting phenomena. This study aims to optimize the desired mixed-matrix hollow-fiber (HF) membrane conditions that have anti-wetting characteristics for efficient desalination. Response surface methodology based on central composite design was used to predict and optimize the permeate flux and salt rejection (SR). The combined effects of polymer (polyvinylidene fluoride, PVDF) concentration, nano-fumed silica (NFS) particle loading, coagulation bath temperature (CBT) and air gap distance (AG), as well as their interactions in terms of desalination performance, have been investigated. RESULTS The linear factors (NFS, CBT), the quadratic effects of all variables, as well as the interacting terms between (PVDF, NFS), (PVDF, CBT) and (NFS, CBT) had significant effects for both pure water and permeate fluxes. For SR, only PVDF presented a linear effect, while a quadratic effect was obtained in (NFS, AG) and an interaction effect was obtained between PVDF and NFS. Under optimal conditions of PVDF (15.03 wt%), NFS (1.21 wt%), CBT (54.85 °C) and AG (9.9 cm), the optimal mixed-matrix HF membrane demonstrated higher experimental average values for pure water and permeate fluxes, which reached up to 11.95 and 11.61 kg m −2 h −1 respectively, and an SR of 99.96% as compared to the pristine membrane. CONCLUSION Our research provides an efficient anti-wetting NFS/PVDF mixed-matrix HF membrane, indicating that the optimal membrane possesses high potential for the direct contact membrane distillation (DCMD) process. © 2023 Society of Chemical Industry (SCI).
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Haoran Pei,Shaohong Shi,Yinghong Chen,Yu Xiong,Qinniu Lv
High-performance flexible piezoelectric polymer–ceramic composites are in high demand for increasing wearable energy-harvesting applications. In this work, a strategy combining solid-state shear milling (S3M) and fused filament fabrication (FFF) 3D-printing technology is proposed for the fabrication of high-performance biomimetic wearable piezoelectric poly(vinylidene fluoride) (PVDF)/tetraphenylphosphonium chloride (TPPC)/barium titanate (BaTiO3) nanocomposite energy harvesters with a biomimetic fish-scale-like metamaterial. The S3M technology could greatly improve the dispersion of BaTiO3 sub-micrometer particles and the interfacial compatibility, resulting in better processability and piezoelectric performance of the nanocomposites. Typically, the FFF 3D printed energy harvester incorporating 30 wt % BaTiO3 showed the highest piezoelectric outputs with an open-circuit voltage of 11.5 V and a short-circuit current of 220 nA. It could hence drive nine green LEDs to work normally. In addition, a 3D-printed biomimetic wearable energy harvester inspired by an environmentally adaptive fish-scale-like metamaterial was further fabricated. The fish-scale-like energy harvester could harvest energy through different deformation motions and successfully recharge a 4.7 μF capacitor by being mounted on a bicycle tire and the tire’s rolling. This work not only provides a 3D printing strategy for designing diversified and complex geometric structures but also paves the way for further applications in flexible, wearable, self-powered electromechanical energy harvesters.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Li Chen,Rui Cui,Weiguo Pan,Jiangdong Dai,Minjia Meng,Xiaohui Dai,Jianming Pan
Efficient separation of single rare earth element such as neodymium (Nd) has become an important research topic due to the supply crisis which seriously restricts the application and promotion of rare earth permanent magnets. PVDF-based separation membranes prepared by non-solvent induced phase separation (NIPS) method usually exhibited hydrophobic surface properties resulting in performance attenuation and operation cost increase. This article applied an easily available NADES from betaine and lactic acid to regulate and control the coagulation bath of a polymer inclusion membrane (PIM) for the separation of Nd, Sm and Dy ions. Evidences for the formation of DES were characterized via 1 H NMR and FT-IR, and betaine showed more obvious changes than lactic acid during the formation of DES via hydrogen bonds . With the help of DES, pores on the surface were much larger and richer, and the migration of P O and P–O groups to the lower epidermal layer of the membrane made the surface layer become more hydrophilic. DES accelerated the liquid-liquid demixing process and led to faster membrane-forming speed and typical finger-like macrovoids and short vertical penetration channels, which could be observed at high DES contents, and a DES content of 5 wt% was found the most optimal considering the overall permeability and separation performances. As an effective means to improve membrane's performances, adding hydrophilic NADESs at a proper ratio in the coagulation bath would be conducive to form more porous structures, higher surface hydrophilicity, optimized permeability and separation performances.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yang Wang,Zhen Chen,Yixin Wu,Yu Li,Ziyu Yue,Minghua Chen
Lithium-ion batteries (LIBs) have achieved a triumph in the market of portable electronic devices since their commercialization in the 1990s due to their high energy density. However, safety issue originating from the flammable, volatile, and toxic organic liquid electrolytes remains a long-standing problem to be solved. Alternatively, composite solid electrolytes (CSEs) have gradually become one of the most promising candidates due to their higher safety and stable electrochemical performance. However, the uniform dispersity of ceramic filler within the polymer matrix remains to be addressed. Generally, all-solid-state lithium metal batteries without any liquid components suffer from poor interfacial contact and low ionic conductivity, which seriously affect the electrochemical performance. Here we report a CSE consisting of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), polydopamine (PDA) coated Li6.4La3Zr1.4Ta0.6O12 (LLZTO) (denoted as PDA@LLZTO) microfiller, polyacrylonitrile (PAN), and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP). Introducing only 4 μL of liquid electrolyte at the electrode|electrolyte interface, the CSE-based cells exhibit high ionic conductivity (0.4 × 10–3 S cm–1 at 25 °C), superior cycle stability, and excellent thermal stability. Even under low temperatures, the impressive electrochemical performance (78.8% of capacity retention after 400 cycles at 1 C, 0 °C, and decent capacities delivered even at low temperature of −20 °C) highlights the potential of such quasi-solid-state lithium metal batteries as a viable solution for the next-generation high-performance lithium metal batteries.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Caixia Chen,Shumei Wang,Fang Han,Xiaoying Zhou,Benxia Li
The reasonable construction of composite membranes with dual functions of rapid adsorption and photo-Fenton-like oxidation degradation holds great significance in the field of wastewater purification. Herein, a poly(vinylidene fluoride)-based composite membrane (denoted as CFT/PVDF) was meticulously prepared through a nonsolvent induced phase separation (NIPS) process with the introduction of cobalt-iron metal–organic framework (CoFe-MOF) and TiO 2 (Degussa P25). The composite membrane exhibited an excellent adsorption ability for removing a variety of organic pollutants from water. With the integration of adsorptive filtration and in situ photo-Fenton-like degradation, the removal efficiency of tetracycline hydrochloride reached up to 92.9% through the CFT/PVDF membrane in one filtration process, and the remarkable performance could be maintained after ten consecutive cycles. Moreover, a group of CFT/PVDF membranes was connected in series to realize the fast and continuous wastewater treatment. The photo-Fenton-like oxidation mechanism and possible degradation pathways were proposed on the basis of active-species detections and degradation intermediates analysis. The toxicological analysis indicated that tetracycline was in situ degraded into less toxic intermediates and even nontoxic substances by the CFT/PVDF composite membrane. This work provides some valuable guidance on the construction of self-cleaning membranes for sustainable wastewater remediation and potential applications.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
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IF 8.742
Jian Zhao,Qinglin Huang,Shangpeng Gao,Hongwei Piao,Quan Quan,Changfa Xiao
Solar thermal membrane distillation is a promising technology for low-cost desalination and water purification . A novel photo-thermal conversion membrane composited by polyacrylonitrile (PAN) nanofiber layer and polyvinylidene fluoride (PVDF) with antimony tin oxide (ATO) as solar-thermal nanoparticles (PVDF-ATO/PAN nanofiber membrane) was fabricated by sequent electrospinning techniques. The dual-layer membrane with hydrophilic PAN and hydrophobic PVDF-ATO was examined by microscopic evaluation and contact angle measurement. In situ temperature increase on membrane superficial layer (PVDF-ATO) driven by solar light illumination was confirmed by thermal imaging system. PAN layer provides water transport channels for facilitating water flow of highly efficient membrane distillation and avoids the salting assembly during the vigorous evaporation. With the help of hydrophilic PAN layer, our PVDF-ATO/PAN nanofiber membrane can fulfill highly effective localized heating transfer with an evaporate rate of 0.93 kg m −2 h −1 , showing great potential for low-cost water desalination and scalable water purification.
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EUROPEAN POLYMER JOURNAL
·
2020
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IF 3.862
Qinting Chen,Bin Yang,Mengya Ding,Yang Pan,Jiasheng Qian,Zhengzhi Zheng,Bin Wu,Jibin Miao,Ru Xia,Youlei Tu,You Shi
In this work, SiO 2 @PDA nanoparticles obtained by in - situ coating polydopamine (PDA) on the surface of spherical SiO 2 nanoparticles were adopted to prepare the polyvinylidene fluoride (PVDF) composite films via thermally-induced phase separation (TIPS) method with diphenyl carbonate (DPC) as the diluent. PDA was proved to cover evenly on the surface of SiO 2 nanoparticles, which was favorable to the dispersion of hydrophilic nanoparticles in the matrix. Effect of the presence of SiO 2 @PDA nanoparticles on crystallization behavior, thermal stability, mechanical properties and hydrophilicity of the composite films was intensively investigated. Heterogeneous nucleating effect on the crystallization of PVDF coupled with elevated crystallinity was found upon the incorporation of SiO 2 @PDA without altering the crystal form of PVDF. The rigidity, tensile strength as well as thermal stability of the composite films containing SiO 2 @PDA were significantly improved in comparison to both neat film and those containing unmodified nanoparticles. In addition, the hydrophilicity of PVDF composite films’ surface was remarkably enhanced with an increasing SiO 2 @PDA content, which helped to reduce the protein adsorption of the composite films considerably. The present study would supply an insight into the fabrication of PVDF composite films with desirable performance and capabilities.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2019
·
IF 6.282
Zhong Yang,Jing Wang,Yiliang Hu,Chaoyong Deng,Kongjun Zhu,Jinhao Qiu
Flexible dielectric capacitors with large energy storage density play key role in modern electronic devices. Ceramic fibers with large dielectric constants are benign candidates to be introduced into the polymer matrix to enhance the energy storage density while guaranteeing the flexibility. In present work, Nd doped BaTiO 3 (NBT) fibers with and without dopamine (PDA) coating were successfully fabricated and introduced into the Poly(vinylidene fluoride) (PVDF) matrix. The dielectric constants and breakdown strength were simultaneously enhanced with a small loading of NBT filler. The subtle modulation was then performed around the filler loading at which the large energy density was obtained. With the NBT loading of 2.5 wt% and 4.2 wt%, the maximum energy density of 9.3 and 10.4 J/cm 3 were obtained in PVDF/NBT and PVDF/NBT@PDA composites, respectively. Both of experimental results and simulation indicate the effectiveness of dopamine coating on the uniform distribution of electric field and good comparability between the matrix and fillers.
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JOURNAL OF MEMBRANE SCIENCE
·
2019
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IF 7.015
Ji-Hao Zuo,Zhong-Kun Li,Chao Wei,Xi Yan,Yan Chen,Wan-Zhong Lang
The PVDF membranes were prepared via thermally induced phase separation (TIPS) method with saline water as quenching bath and applied to the separation of oil/water emulsions. Surface pore size, permeation performance and other properties of the PVDF membranes were finely tuned by adjusting salt concentration in quenching bath. The results show that with the addition of NaCl in quenching bath, the thermal transfer resistance increases in the TIPS process due to the obvious increase of bath viscosity and the slight decline of thermal conductivity of saline solution. All the PVDF membranes present bi-continuously fibrillar structure in top surfaces. The fibrils are fused together and get thicker, and leads to rougher top surfaces due to the decline of cooling rate with the addition of NaCl in quenching bath. At the same time, the PVDF membranes exhibit expanded pore size and higher permeation flux for both pure water and oil/emulsions. The PVDF membrane of S20 (prepared with 20 wt% NaCl aqueous solution as quenching bath) exhibits the largest mean pore size and the highest pure water permeation flux of 2481.1 L m −2 h −1 bar −1 . However, overhigh NaCl content leads to the inverse trend. For example, the PVDF membrane of S30 (quenching bath containing 30 wt% NaCl) exhibits a lightly decreased pore size and pure water permeation flux compared to S20. All of the PVDF membranes exhibit good oil rejections above 90.0% for surfactant-stabilized oil-in-water emulsions and above 95.0% for surfactant-free oil-in-water emulsions.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yuanming Tan,Zhongqiao Sun,Hao Meng,Yide Han,Junbiao Wu,Junli Xu,Yan Xu,Xia Zhang
MOFs/polymer hybrid membranes combine the special surface activity of MOFs and the excellent carries nature of porous polymer and thus exhibit unexpected adsorption/separation performances in the solid-phase extraction. In this paper, a new kind of MOFs/polymer composite membrane , MIL-68(Al)/PVDF have been fabricated for the first time through blending the MIL-68(Al) nanoparticles and polyvinylidene fluoride (PVDF) casting solution and following the lyotropic phase transition. Some means such as SEM, XRD and FT-IR are used to character the structure of these hybrid membranes. The membrane performances including the hydrophilic/hydrophobic properties, membrane porosity and membrane water flux are also measured. The effects of doping amount of MIL-68(Al) on the structure and performances of MIL-68(Al)/PVDF hybrid membranes are discussed. Two persistent organic pollutants : p -nitrophenol (PNP) and methylene blue (MB) are chosen as main adsorption objects to evaluate the adsorption activity of MIL-68(Al)/PVDF hybrid membranes. The influences of various conditions on the adsorption activities are investigated in detail and the optimum adsorption conditions are determined. All the MIL-68(Al)/PVDF hybrid membranes exhibit enhanced adsorption capacity compared to pristine PVDF, and the adsorption activities of hybrid membranes are promoted continually with the increasing doping contents of MIL-68(Al). The adsorption thermodynamics analysis indicates that the adsorption process is mainly characterized by Langmuir monolayer adsorption and chemical adsorption . The coordination bonding formed between NO 2 of PNP and Al(III) of MIL-68(Al), and the acid-base interaction between the sulfur of MB and Al(III) of MIL-68(Al) may be responsible to the highest removal efficiency of PNP and MB. The good dynamics adsorption and regeneration performances indicate the prospect applications of these MOFs/PVDF hybrid membranes in the separation of organic contaminants from industrial waste water.
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