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Glass S, Schmidt M, Merten P, Abdul Latif A, Fischer K, Schulze A, Friederich P, Filiz V. Design of Modified Polymer Membranes Using Machine Learning. ACS APPLIED MATERIALS & INTERFACES 2024; 16. [PMID: 38600824 PMCID: PMC11056926 DOI: 10.1021/acsami.3c18805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 03/19/2024] [Accepted: 03/21/2024] [Indexed: 04/12/2024]
Abstract
Surface modification is an attractive strategy to adjust the properties of polymer membranes. Unfortunately, predictive structure-processing-property relationships between the modification strategies and membrane performance are often unknown. One possibility to tackle this challenge is the application of data-driven methods such as machine learning. In this study, we applied machine learning methods to data sets containing the performance parameters of modified membranes. The resulting machine learning models were used to predict performance parameters, such as the pure water permeability and the zeta potential of membranes modified with new substances. The predictions had low prediction errors, which allowed us to generalize them to similar membrane modifications and processing conditions. Additionally, machine learning methods were able to identify the impact of substance properties and process parameters on the resulting membrane properties. Our results demonstrate that small data sets, as they are common in materials science, can be used as training data for predictive machine learning models. Therefore, machine learning shows great potential as a tool to expedite the development of high-performance membranes while reducing the time and costs associated with the development process at the same time.
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Affiliation(s)
- Sarah Glass
- Institute
of Membrane Research, Helmholtz-Zentrum
Hereon, Max-Planck-Str.
1, Geesthacht 21502, Germany
- Institute
of Theoretical Informatics, Karlsruhe Institute
of Technology (KIT), Kaiserstr. 12, 76131 Karlsruhe, Germany
| | - Martin Schmidt
- Leibniz
Institute of Surface Engineering (IOM), Permoserstr. 15, Leipzig 04318, Germany
| | - Petra Merten
- Institute
of Membrane Research, Helmholtz-Zentrum
Hereon, Max-Planck-Str.
1, Geesthacht 21502, Germany
| | - Amira Abdul Latif
- Leibniz
Institute of Surface Engineering (IOM), Permoserstr. 15, Leipzig 04318, Germany
| | - Kristina Fischer
- Leibniz
Institute of Surface Engineering (IOM), Permoserstr. 15, Leipzig 04318, Germany
| | - Agnes Schulze
- Leibniz
Institute of Surface Engineering (IOM), Permoserstr. 15, Leipzig 04318, Germany
| | - Pascal Friederich
- Institute
of Theoretical Informatics, Karlsruhe Institute
of Technology (KIT), Kaiserstr. 12, 76131 Karlsruhe, Germany
- Institute
of Nanotechnology, Karlsruhe Institute of
Technology (KIT), Kaiserstr.
12, 76131 Karlsruhe, Germany
| | - Volkan Filiz
- Institute
of Membrane Research, Helmholtz-Zentrum
Hereon, Max-Planck-Str.
1, Geesthacht 21502, Germany
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Fionah A, McLarney K, Judd A, Escobar IC. Effects of the Applied Potential on the Performance of Polysulfone Membranes Functionalized with Sulfonated Polyether Ether Ketone Polymers. MEMBRANES 2023; 13:675. [PMID: 37505041 PMCID: PMC10386516 DOI: 10.3390/membranes13070675] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 07/08/2023] [Accepted: 07/10/2023] [Indexed: 07/29/2023]
Abstract
The global water crisis growth has led to a tremendous increase in membrane technology research. Membranes are favored over many other technologies for water treatment because, in principle, they require no chemical additives and can be used isothermally at low temperatures. Membranes that can reject contaminants and salts, produce adequate permeate flux values, and require minimal cleaning are highly demanded. However, most synthesized membranes on the market have associated problems, such as membrane fouling; inverse relationships between flux and solute rejection; and the high cost of synthesis, operation, and maintenance. Therefore, there is a continuied need to produce membranes with properties that make them able to sustain flux and selectivity over time. This research study focused on increasing the surface charge and hydrophilicity of polysulfone (PSf) membranes by incorporating sulfonate-functionalized poly-ether-ether-ketone (SPEEK) into PSf/N-Methyl-2-pyrrolidone (PSf/NMP) membranes. The sulfonation of the PEEK provided a net increase in negative charge on the surface of the membranes that enabled charge repulsion to take place, thus increasing the rejection of ions. In this project, the effect of the applied potential on the performance of SPEEK: PSf/NMP membranes was evaluated. The characterization of the as-synthesized membranes was carried out using the surface's structure and morphology, contact angle, and zeta potential. Furthermore, a voltage of 1.5 V was applied to the membranes in the presence of various salts (sodium chloride, calcium chloride, and potassium chloride salts) to evaluate the effects of the applied potential on solute rejection. It was found that both the permeability and the selectivity of the membranes increased when the voltage was applied. The obtained results indicate that incorporating SPEEK into PSf/NMP membranes increased the hydrophilicity of the membranes, and under the applied voltage, the incorporation allowed it to function as an electrodialysis process that is capable of removing ions from water bodies by utilizing the charge repulsion of ions.
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Affiliation(s)
- Abelline Fionah
- Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA
| | - Kate McLarney
- Department of Materials and Chemical Engineering, University of Kentucky, Lexington, KY 40506, USA
| | - Aviana Judd
- Department of Materials and Chemical Engineering, University of Kentucky, Lexington, KY 40506, USA
| | - Isabel C Escobar
- Department of Materials and Chemical Engineering, University of Kentucky, Lexington, KY 40506, USA
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Bóna Á, Galambos I, Nemestóthy N. Progress towards Stable and High-Performance Polyelectrolyte Multilayer Nanofiltration Membranes for Future Wastewater Treatment Applications. MEMBRANES 2023; 13:368. [PMID: 37103795 PMCID: PMC10146247 DOI: 10.3390/membranes13040368] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 03/09/2023] [Accepted: 03/22/2023] [Indexed: 06/19/2023]
Abstract
The increasing demand for nanofiltration processes in drinking water treatment, industrial separation and wastewater treatment processes has highlighted several shortcomings of current state-of-the-art thin film composite (TFC NF) membranes, including limitations in chemical resistance, fouling resistance and selectivity. Polyelectrolyte multilayer (PEM) membranes provide a viable, industrially applicable alternative, providing significant improvements in these limitations. Laboratory experiments using artificial feedwaters have demonstrated selectivity an order of magnitude higher than polyamide NF, significantly higher fouling resistance and excellent chemical resistance (e.g., 200,000 ppmh chlorine resistance and stability over the 0-14 pH range). This review provides a brief overview of the various parameters that can be modified during the layer-by-layer procedure to determine and fine-tune the properties of the resulting NF membrane. The different parameters that can be adjusted during the layer-by-layer process are presented, which are used to optimize the properties of the resulting nanofiltration membrane. Substantial progress in PEM membrane development is presented, particularly selectivity improvements, of which the most promising route seems to be asymmetric PEM NF membranes, offering a breakthrough in active layer thickness and organic/salt selectivity: an average of 98% micropollutant rejection coupled with a NaCl rejection below 15%. Advantages for wastewater treatment are highlighted, including high selectivity, fouling resistance, chemical stability and a wide range of cleaning methods. Additionally, disadvantages of the current PEM NF membranes are also outlined; while these may impede their use in some industrial wastewater applications, they are largely not restrictive. The effect of realistic feeds (wastewaters and challenging surface waters) on PEM NF membrane performance is also presented: pilot studies conducted for up to 12 months show stable rejection values and no significant irreversible fouling. We close our review by identifying research areas where further studies are needed to facilitate the adoption of this notable technology.
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Affiliation(s)
- Áron Bóna
- Soós Ernő Research and Development Center, University of Pannonia, Vár u. 8., H-8800 Nagykanizsa, Hungary
| | - Ildikó Galambos
- Soós Ernő Research and Development Center, University of Pannonia, Vár u. 8., H-8800 Nagykanizsa, Hungary
| | - Nándor Nemestóthy
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem u. 10., H-8200 Veszprém, Hungary
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Single-Step Surface Hydrophilization on Ultrafiltration Membrane with Enhanced Antifouling Property for Pome Wastewater Treatment. SEPARATIONS 2023. [DOI: 10.3390/separations10030188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023] Open
Abstract
High organic materials in palm oil mill effluent (POME) can result in serious water pollution. To date, biological treatment has been used to reduce the environmental risks of these effluents prior of their discharge into water streams. However, the effluents’ dark brownish colour remains as a significant issue that must be addressed, as it affects the overall quality of water. Although membrane technology has been frequently used to address these difficulties, membrane fouling has become a serious limitation in POME treatment. On the other hand, zwitterions with balanced charge groups have received growing interest in the fabrication of antifouling membranes due to their hydrated nature. The development of a simple and efficient covalent bonding technique to improve the stability of zwitterions on membrane surfaces remains a challenge. By grafting and co-depositing polyethylenimine (PEI)-based zwitterion (Z-PEI) with super hydrophilic polydopamine (PDA) on the surface of a commercial polysulfone (PSf) ultrafiltration membrane at ambient temperature, a new zwitterionic surface with a neutral surface charge was created (PDA/Z-PEI). This study aims to investigate the effect of different loading ratios of PDA/Z-PEI (1:1, 1:2, and 1:3) and evaluate their performance on treating brownish coloured anaerobically treated POME (AT-POME). SEM and FTIR analysis showed the successful incorporation of the PDA/Z-PEI membrane while the zwitterionic feature is indicated by zeta potential analysis. Water flux analysis demonstrated that a lower water flux was achieved for M-ZPEI membranes as compared to the PSf and PSf-MDPA membranes, attributed by the tight skin layer of PDA-ZPEI. In the development of a tight hydration layer on the membrane surface by zwitterions, zwitterionic membranes demonstrated excellent antifouling capabilities, particularly PDA/Z-PEI with a loading ratio of (1:2) with a flux recovery ratio of around 84% and colour rejection of 81.75%. Overall, this research contributes to the development of a unique coating with improved stability and antifouling properties by altering the membrane surface in a simple and reliable manner.
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Popkov A, Su Z, Sigurdardóttir SB, Luo J, Malankowska M, Pinelo M. Engineering polyelectrolyte multilayer coatings as a strategy to optimize enzyme immobilization on a membrane support. Biochem Eng J 2023. [DOI: 10.1016/j.bej.2023.108838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Semi-automated water sampling module for repeated sampling and concentration of Bacillus cereus group spores. Sci Rep 2023; 13:831. [PMID: 36646757 PMCID: PMC9842714 DOI: 10.1038/s41598-023-27900-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Accepted: 01/10/2023] [Indexed: 01/17/2023] Open
Abstract
Monitoring the presence of pathogenic Bacillus spores is important for industrial applications, as well as necessary for ensuring human health. Bacillus thuringiensis is used as a biopesticide against several insect pests. Bacillus cereus spores are a significant cause of food poisoning, and Bacillus anthracis is a recognized biosecurity threat. Laboratory-based methods, such as polymerase chain reaction, enzyme-linked immunosorbent assay, or matrix-assisted laser desorption ionization spectroscopy provide sensitive detection of bacteria and spores, but the application of those methods for quasi-continuous environmental monitoring presents a significant challenge requiring frequent human intervention. To address this challenge, we developed a workstation for quasi-autonomous monitoring of water reservoirs for the presence of bacteria and spores, and designed and validated the functionality of a microprocessor-controlled module capable of repetitive collection and pre-concentration of spores in liquid samples tested with fiberglass (FG), polyether sulfone and polyvinylidene fluoride filters. The best results were obtained with FG filters delivering a 20× concentration of B. thuringiensis and B. cereus spores from saline suspensions. The successful 20× pre-concentration of Bacillus spores demonstrated with FG filters could be repeated up to 3 times when bleach decontamination is applied between filtrations. Taken together, our results demonstrate an attractive instrument suitable for semi-automated, quasi-continuous sampling and pre-processing of water samples for biosensing of bacterial spores originating from a complex environment.
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Christopher CN, Moutloali RM. Antibacterial studies of Ag@HPEI@GO nanocomposites and their effects on fouling and dye rejection in PES UF membranes. Heliyon 2022; 8:e11825. [DOI: 10.1016/j.heliyon.2022.e11825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 05/22/2022] [Accepted: 11/15/2022] [Indexed: 11/23/2022] Open
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8
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Mkpuma VO, Moheimani NR, Fischer K, Schulze A, Ennaceri H. Membrane surface zwitterionization for an efficient microalgal harvesting: A review. ALGAL RES 2022. [DOI: 10.1016/j.algal.2022.102797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Choi S, Vazquez-Duhalt R, Graeve OA. Nonlinear charge regulation for the deposition of silica nanoparticles on polystyrene spherical surfaces. J Colloid Interface Sci 2022; 613:747-763. [PMID: 35066233 DOI: 10.1016/j.jcis.2022.01.076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 01/10/2022] [Accepted: 01/11/2022] [Indexed: 11/27/2022]
Abstract
HYPOTHESIS We describe the deposition behavior of monodispersed silica nanoparticles on polystyrene spherical particles by using modified pairwise DLVO (Derjaguin-Landau-Verwey-Overbeek) interaction force profiles at pH values between two and twelve. Our modified model contains a new nonlinear charge regulation parameter that considers redistribution of ions, which allows us to realistically express the electrical double layer (EDL) interaction forces. EXPERIMENTS Silanol-terminated silica nanoparticles (7.6 ± 0.4 nm), l-lysine-covered silica nanoparticles (7.8 ± 0.4 nm), and polyallylamine hydrochloride-covered polystyrene (PAH/PS) particles (348 ± 1 nm) were synthesized. Then, each type of silica nanoparticle was deposited on the PAH/PS particles at a range of pH values. FINDINGS Our new regulation parameter describes the realistic redistribution of charges governed by pH, total salt concentration, ionic strength of solution, and separation distance of particles. We find that this regulation parameter can be roughly approximated from the absolute values of theoretically calculated surface charge density and potential distributions, as well as experimentally measured ζ-potentials. Morphological analysis using electron microscopy of the experimental systems shows that the modified pairwise DLVO interaction forces exceptionally describe the deposition behavior of the silica nanoparticles physically adsorbed on the PAH/PS particle substrates.
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Affiliation(s)
- Seongcheol Choi
- Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Drive - MC 0411, La Jolla, CA 92093-0411, USA
| | - Rafael Vazquez-Duhalt
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Carretera Tijuana-Ensenada Km. 107, C.P. 22860, Ensenada, B.C., México
| | - Olivia A Graeve
- Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Drive - MC 0411, La Jolla, CA 92093-0411, USA.
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Effect of the Incorporation of ZIF-8@GO into the Thin-Film Membrane on Salt Rejection and BSA Fouling. MEMBRANES 2022; 12:membranes12040436. [PMID: 35448406 PMCID: PMC9027943 DOI: 10.3390/membranes12040436] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 03/24/2022] [Accepted: 03/29/2022] [Indexed: 12/10/2022]
Abstract
A series of Zeolitic imidazole framework-8 (ZIF-8) clusters supported on graphene oxide (ZIF-8@GO) nanocomposites were prepared by varying the ratios of ZIF-8 to GO. The resultant nanocomposites were characterized using various techniques, such as Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), thermogravimetric analysis (TGA), Fourier Transform Infrared (FTIR) and Raman spectroscopy. These nanocomposites were incorporated into the thin film layer during interfacial polymerisation process of m-phenylenediamine (aqueous phase which contained the dispersed nanocomposites) and trimesoyl chloride (TMC, organic phase) at room temperature onto polyethersulfone (PES) ultrafiltration (UF) support membrane. The membrane surface morphology, cross section and surface roughness were characterized using SEM and AFM, respectively. Compared to the baseline membranes, the thin film nanofiltration (TFN) membranes exhibited improved pure water flux (from 1.66 up to 7.9 L.m-2h-1), salt rejection (from 40 to 98%) and fouling resistance (33 to 88%). Optimum ZIF-8 to GO ratio was established as indicated in observed pure water flux, salt rejection and BSA fouling resistance. Therefore, a balance in hydrophilic and porous effect of the filler was observed to lead to this observed membrane behaviour suggesting that careful filler design can result in performance gain for thin film composite (TFC) membranes for water treatment application.
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Hsu CH, Venault A, Chang Y. Facile zwitterionization of polyvinylidene fluoride microfiltration membranes for biofouling mitigation. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2022.120348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Nayak K, Kumar A, Tripathi BP. Molecular grafting and zwitterionization based antifouling and underwater superoleophobic PVDF membranes for oil/water separation. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2021.120038] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Sharabati JAD, Erkoc-Ilter S, Guclu S, Koseoglu-Imer D, Unal S, Menceloglu Y, Ozturk I, Koyuncu I. Zwitterionic polysiloxane-polyamide hybrid active layer for high performance and chlorine resistant TFC desalination membranes. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.119965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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14
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Schmidt M, Abdul Latif A, Prager A, Gläser R, Schulze A. Highly Efficient One-Step Protein Immobilization on Polymer Membranes Supported by Response Surface Methodology. Front Chem 2022; 9:804698. [PMID: 35118049 PMCID: PMC8804297 DOI: 10.3389/fchem.2021.804698] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 12/20/2021] [Indexed: 12/26/2022] Open
Abstract
Immobilization of proteins by covalent coupling to polymeric materials offers numerous excellent advantages for various applications, however, it is usually limited by coupling strategies, which are often too expensive or complex. In this study, an electron-beam-based process for covalent coupling of the model protein bovine serum albumin (BSA) onto polyvinylidene fluoride (PVDF) flat sheet membranes was investigated. Immobilization can be performed in a clean, fast, and continuous mode of operation without any additional chemicals involved. Using the Design of Experiments (DoE) approach, nine process factors were investigated for their influence on graft yield and homogeneity. The parameters could be reduced to only four highly significant factors: BSA concentration, impregnation method, impregnation time, and electron beam irradiation dose. Subsequently, optimization of the process was performed using the Response Surface Methodology (RSM). A one-step method was developed, resulting in a high BSA grafting yield of 955 mg m−2 and a relative standard deviation of 3.6%. High efficiency was demonstrated by reusing the impregnation solution five times consecutively without reducing the final BSA grafting yield. Comprehensive characterization was conducted by X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), and measurements of zeta potential, contact angle and surface free energy, as well as filtration performance. In addition, mechanical properties and morphology were examined using mercury porosimetry, tensile testing, and scanning electron microscopy (SEM).
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Affiliation(s)
- Martin Schmidt
- Leibniz Institute of Surface Engineering (IOM), Leipzig, Germany
| | | | - Andrea Prager
- Leibniz Institute of Surface Engineering (IOM), Leipzig, Germany
| | - Roger Gläser
- Institute of Chemical Technology, Leipzig University, Leipzig, Germany
| | - Agnes Schulze
- Leibniz Institute of Surface Engineering (IOM), Leipzig, Germany
- *Correspondence: Agnes Schulze,
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15
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Foster JC, DeVol TA, Husson SM. Membranes for the Capture and Screening of Waterborne Plutonium Based on a Novel Pu-Extractive Copolymer Additive. MEMBRANES 2021; 12:3. [PMID: 35054528 PMCID: PMC8779412 DOI: 10.3390/membranes12010003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 12/13/2021] [Accepted: 12/17/2021] [Indexed: 06/14/2023]
Abstract
This contribution describes the fabrication of plutonium-adsorptive membranes by non-solvent induced phase separation. The dope solution comprised poly(vinylidene fluoride) (PVDF) and a Pu-extractive copolymer additive of PVDF-g-poly(ethylene glycol methacrylate phosphate) (EGMP) in dimethylformamide (DMF). The effects of casting conditions on membrane permeability were determined for PVDF membranes prepared with 10 wt% PVDF-g-EGMP. Direct-flow filtration and alpha spectrometry showed that membranes containing the graft copolymer could recover Pu up to 59.9 ± 3.0% from deionized water and 19.3 ± 3.5% from synthetic seawater after filtering 10 mL of 0.5 Bq/mL 238Pu. SEM-EDS analysis indicated that the graft copolymer was distributed evenly throughout the entire depth of the copolymer membranes, likely attributing to the tailing observed in the alpha spectra for 238Pu. Despite the reduction in resolution, the membranes exhibited high Pu uptake at the conditions tested, and new membrane designs that promote copolymer surface migration are expected to improve alpha spectrometry peak energy resolutions. Findings from this study also can be used to guide the development of extractive membranes for chromatographic separation of actinides from contaminated groundwater sources.
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Affiliation(s)
- James C. Foster
- Department of Chemical and Biomolecular Engineering, Clemson University, 127 Earle Hall, Clemson, SC 29634, USA;
- Nuclear Environmental Engineering Sciences, Radioactive Waste Management Center, Clemson University, Clemson, SC 29625, USA;
| | - Timothy A. DeVol
- Nuclear Environmental Engineering Sciences, Radioactive Waste Management Center, Clemson University, Clemson, SC 29625, USA;
- Department of Environmental Engineering and Earth Sciences, Clemson University, 342 Computer Court, Anderson, SC 29625, USA
| | - Scott M. Husson
- Department of Chemical and Biomolecular Engineering, Clemson University, 127 Earle Hall, Clemson, SC 29634, USA;
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Gryshkov O, AL Halabi F, Kuhn AI, Leal-Marin S, Freund LJ, Förthmann M, Meier N, Barker SA, Haastert-Talini K, Glasmacher B. PVDF and P(VDF-TrFE) Electrospun Scaffolds for Nerve Graft Engineering: A Comparative Study on Piezoelectric and Structural Properties, and In Vitro Biocompatibility. Int J Mol Sci 2021; 22:11373. [PMID: 34768804 PMCID: PMC8583857 DOI: 10.3390/ijms222111373] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 10/14/2021] [Accepted: 10/16/2021] [Indexed: 12/19/2022] Open
Abstract
Polyvinylidene fluoride (PVDF) and its copolymer with trifluoroethylene (P(VDF-TrFE)) are considered as promising biomaterials for supporting nerve regeneration because of their proven biocompatibility and piezoelectric properties that could stimulate cell ingrowth due to their electrical activity upon mechanical deformation. For the first time, this study reports on the comparative analysis of PVDF and P(VDF-TrFE) electrospun scaffolds in terms of structural and piezoelectric properties as well as their in vitro performance. A dynamic impact test machine was developed, validated, and utilised, to evaluate the generation of an electrical voltage upon the application of an impact load (varying load magnitude and frequency) onto the electrospun PVDF (15-20 wt%) and P(VDF-TrFE) (10-20 wt%) scaffolds. The cytotoxicity and in vitro performance of the scaffolds was evaluated with neonatal rat (nrSCs) and adult human Schwann cells (ahSCs). The neurite outgrowth behaviour from sensory rat dorsal root ganglion neurons cultured on the scaffolds was analysed qualitatively. The results showed (i) a significant increase of the β-phase content in the PVDF after electrospinning as well as a zeta potential similar to P(VDF-TrFE), (ii) a non-constant behaviour of the longitudinal piezoelectric strain constant d33, depending on the load and the load frequency, and (iii) biocompatibility with cultured Schwann cells and guiding properties for sensory neurite outgrowth. In summary, the electrospun PVDF-based scaffolds, representing piezoelectric activity, can be considered as promising materials for the development of artificial nerve conduits for the peripheral nerve injury repair.
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Affiliation(s)
- Oleksandr Gryshkov
- Institute for Multiphase Processes, Leibniz University Hannover, An der Universität 1, Building 8143, 30823 Garbsen, Germany; (A.I.K.); (S.L.-M.); (S.-A.B.); (B.G.)
- Lower Saxony Centre for Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625 Hannover, Germany
| | - Fedaa AL Halabi
- Institute for Multiphase Processes, Leibniz University Hannover, An der Universität 1, Building 8143, 30823 Garbsen, Germany; (A.I.K.); (S.L.-M.); (S.-A.B.); (B.G.)
| | - Antonia Isabel Kuhn
- Institute for Multiphase Processes, Leibniz University Hannover, An der Universität 1, Building 8143, 30823 Garbsen, Germany; (A.I.K.); (S.L.-M.); (S.-A.B.); (B.G.)
| | - Sara Leal-Marin
- Institute for Multiphase Processes, Leibniz University Hannover, An der Universität 1, Building 8143, 30823 Garbsen, Germany; (A.I.K.); (S.L.-M.); (S.-A.B.); (B.G.)
- Lower Saxony Centre for Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625 Hannover, Germany
| | - Lena Julie Freund
- Institute of Neuroanatomy and Cell Biology, Hannover Medical School, Centre for Systems Neuroscience (ZSN) Hannover, 30559 Hannover, Germany; (L.J.F.); (M.F.); (K.H.-T.)
| | - Maria Förthmann
- Institute of Neuroanatomy and Cell Biology, Hannover Medical School, Centre for Systems Neuroscience (ZSN) Hannover, 30559 Hannover, Germany; (L.J.F.); (M.F.); (K.H.-T.)
| | - Nils Meier
- Institute for Technical Chemistry, Braunschweig University of Technology, Hagenring 30, 38106 Braunschweig, Germany;
| | - Sven-Alexander Barker
- Institute for Multiphase Processes, Leibniz University Hannover, An der Universität 1, Building 8143, 30823 Garbsen, Germany; (A.I.K.); (S.L.-M.); (S.-A.B.); (B.G.)
- Lower Saxony Centre for Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625 Hannover, Germany
| | - Kirsten Haastert-Talini
- Institute of Neuroanatomy and Cell Biology, Hannover Medical School, Centre for Systems Neuroscience (ZSN) Hannover, 30559 Hannover, Germany; (L.J.F.); (M.F.); (K.H.-T.)
| | - Birgit Glasmacher
- Institute for Multiphase Processes, Leibniz University Hannover, An der Universität 1, Building 8143, 30823 Garbsen, Germany; (A.I.K.); (S.L.-M.); (S.-A.B.); (B.G.)
- Lower Saxony Centre for Biomedical Engineering, Implant Research and Development, Stadtfelddamm 34, 30625 Hannover, Germany
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17
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Facile Fabrication of Multi-Hydrogen Bond Self-Assembly Poly(MAAc-co-MAAm) Hydrogel Modified PVDF Ultrafiltration Membrane to Enhance Anti-Fouling Property. MEMBRANES 2021; 11:membranes11100761. [PMID: 34677527 PMCID: PMC8537210 DOI: 10.3390/membranes11100761] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 09/22/2021] [Accepted: 09/27/2021] [Indexed: 11/20/2022]
Abstract
In this work, a facile preparation method was proposed to reduce natural organics fouling of hydrophobic membrane via UV grafting polymerization with methacrylic acid (MAAc) and methyl acrylamide (MAAm) as hydrophilic monomers, followed by multihydrogen bond self-assembly. The resulting poly(vinylidene fluoride)-membranes were characterized with respect to monomer ratio, chemical structure and morphology, surface potential, and water contact angle, as well as water flux and organic foulants ultrafiltration property. The results indicated that the optimal membrane modified with a poly(MAAc-co-MAAm) polymer gel layer derived from a 1:1 monomer ratio exhibited superior hydrophilicity and excellent gel layer stability, even after ultrasonic treatment or soaking in acid or alkaline aqueous solution. The initial water contact angle of modified membranes was only 36.6° ± 2.9, and dropped to 0° within 13 s. Moreover, flux recovery rates (FRR) of modified membranes tested by bovine serum albumin (BSA), humic acid (HA), and sodium alginate (SA) solution, respectively, were all above 90% after one-cycle filtration (2 h), significantly higher than that of the pure membrane (70–76%). The total fouling rates (Rt) of the pure membrane for three foulants were as high as 47.8–56.2%, while the Rt values for modified membranes were less than 30.8%. Where Rt of BSA dynamic filtration was merely 10.7%. The membrane designed through grafting a thin-layer hydrophilic hydrogel possessed a robust antifouling property and stability, which offers new insights for applications in pure water treatment or protein purification.
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18
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Rubin AE, Sarkar AK, Zucker I. Questioning the suitability of available microplastics models for risk assessment - A critical review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 788:147670. [PMID: 34029818 DOI: 10.1016/j.scitotenv.2021.147670] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 04/14/2021] [Accepted: 05/06/2021] [Indexed: 06/12/2023]
Abstract
The rise of microplastic (MP) pollution in the environment has been bolstering concerns regarding MPs' unknown environmental fate, transport, and potential toxicity toward living forms. However, the use of real environmental plastics for risk assessment is often hindered due to technical and practical challenges such as plastics' heterogeneity and their wide size distribution in the environment. To overcome this issue, most available data in the field is generated using plastic models as surrogates for environmental samples. In this critical review, we describe the gaps in risk assessments drawn from these plastic models. Specifically, we compare physicochemical properties of real environmental plastic particles to synthesized polymeric micro-beads, one of the most commonly used plastic models in current literature. Several surface and bulk characteristics including size, surface chemistry, polymer type, and morphology are shown to not only be inherently different between environmental MP's and synthesized micro-beads, but also drive behavior in fate, transport, and toxicity assays. We highlight the importance of expressing real-world physicochemical characteristics in representative MP models and outline how current state-of-the-art models are limited in this regard. To address this issue, we suggest future areas of research such as combinations of mechanical, photochemical, and thermal degradation processes to simulate real-world weathering, all in an effort to increase realism of plastic modeling and allow more robust and reliable environmental MP risk assessment in the future.
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Affiliation(s)
- Andrey Ethan Rubin
- Porter School of Earth and Environmental Studies, Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
| | - Amit Kumar Sarkar
- Porter School of Earth and Environmental Studies, Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel; School of Mechanical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel
| | - Ines Zucker
- Porter School of Earth and Environmental Studies, Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel; School of Mechanical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel.
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19
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Jariwala T, Ico G, Tai Y, Park H, Myung NV, Nam J. Mechano-Responsive Piezoelectric Nanofiber as an On-Demand Drug Delivery Vehicle. ACS APPLIED BIO MATERIALS 2021; 4:3706-3715. [PMID: 35014455 DOI: 10.1021/acsabm.1c00232] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The control over biodistribution and pharmacokinetics is critical to enhance the efficacy and minimize the side effects of therapeutic agents. To address the need for an on-demand drug delivery system for precise control over the release time and the quantity of drugs, we exploited the mechano-responsiveness of piezoelectric poly(vinylidene fluoride-trifluroethylene) (P(VDF-TrFE)) nanofibers for drug delivery applications. The large surface area-to-volume ratio inherent to nanomaterials, together with the transformative piezoelectric properties, allowed us to use the material as an ultrasensitive and mechano-responsive drug delivery platform driven by the direct piezoelectric effect. The intrinsic negative zeta potential of the nanofibers was utilized to electrostatically load cationic drug molecules, where surface potential changes by exogenous mechanical actuation trigger the release of drug molecules. We show that the drug release kinetics of the P(VDF-TrFE) nanofibers depends on the fiber diameter, thus piezoelectric properties. We further demonstrated that the drug release quantity can be tuned by the applied pressure or dose of physiologically safe corporeal shockwaves as a mechanical stimulus in in vitro and ex vivo models. Overall, we demonstrated the utility of piezoelectric electrospun nanofibers for mechano-responsive controlled drug release.
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Affiliation(s)
- Tanvi Jariwala
- Department of Bioengineering, University of California, Riverside, California 92521, United States
| | - Gerardo Ico
- Department of Bioengineering, University of California, Riverside, California 92521, United States
| | - Youyi Tai
- Department of Bioengineering, University of California, Riverside, California 92521, United States
| | - Honghyun Park
- Korea Institute of Materials Science, 797 Changwondaero, Seongsan gu, Changwon, Gyeongnam 51508, South Korea
| | - Nosang V Myung
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Jin Nam
- Department of Bioengineering, University of California, Riverside, California 92521, United States
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20
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Asif MB, Hou J, Price WE, Chen V, Hai FI. Removal of trace organic contaminants by enzymatic membrane bioreactors: Role of membrane retention and biodegradation. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2020.118345] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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21
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Reduction of Biofouling of a Microfiltration Membrane Using Amide Functionalities-Hydrophilization without Changes in Morphology. Polymers (Basel) 2020; 12:polym12061379. [PMID: 32575508 PMCID: PMC7362187 DOI: 10.3390/polym12061379] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 06/02/2020] [Accepted: 06/09/2020] [Indexed: 01/22/2023] Open
Abstract
A major goal of membrane science is the improvement of the membrane performance and the reduction of fouling effects, which occur during most aqueous filtration applications. Increasing the surface hydrophilicity can improve the membrane performance (in case of aqueous media) and decelerates membrane fouling. In this study, a PES microfiltration membrane (14,600 L m-2 h-1 bar-1) was hydrophilized using a hydrophilic surface coating based on amide functionalities, converting the hydrophobic membrane surface (water contact angle, WCA: ~90°) into an extremely hydrophilic one (WCA: ~30°). The amide layer was created by first immobilizing piperazine to the membrane surface via electron beam irradiation. Subsequently, a reaction with 1,3,5-benzenetricarbonyl trichloride (TMC) was applied to generate an amide structure. The presented approach resulted in a hydrophilic membrane surface, while maintaining permeance of the membrane without pore blocking. All membranes were investigated regarding their permeance, porosity, average pore size, morphology (SEM), chemical composition (XPS), and wettability. Soxhlet extraction was carried out to demonstrate the stability of the applied coating. The improvement of the modified membranes was demonstrated using dead-end filtration of algae solutions. After three fouling cycles, about 60% of the initial permeance remain for the modified membranes, while only ~25% remain for the reference.
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22
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Yiengveerachon C, Yoshikawa S, Matsumoto H, Ookawara S. Characteristics of coconut protein separation process by means of membrane ultrafiltration. J FOOD PROCESS ENG 2020. [DOI: 10.1111/jfpe.13363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Chayapa Yiengveerachon
- Department of Chemical Science and Engineering, School of Materials and Chemical TechnologyTokyo Institute of Technology Tokyo Japan
| | - Shiro Yoshikawa
- Department of Chemical Science and Engineering, School of Materials and Chemical TechnologyTokyo Institute of Technology Tokyo Japan
| | - Hideyuki Matsumoto
- Department of Chemical Science and Engineering, School of Materials and Chemical TechnologyTokyo Institute of Technology Tokyo Japan
| | - Shinichi Ookawara
- Department of Chemical Science and Engineering, School of Materials and Chemical TechnologyTokyo Institute of Technology Tokyo Japan
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23
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Moringo NA, Shen H, Tauzin LJ, Wang W, Landes CF. Polymer Free Volume Effects on Protein Dynamics in Polystyrene Revealed by Single-Molecule Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:2330-2338. [PMID: 32078328 DOI: 10.1021/acs.langmuir.9b03535] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Protein-polymer interactions are critical to applications ranging from biomedical devices to chromatographic separations. The mechanistic relationship between the microstructure of polymer chains and protein interactions is challenging to quantify and not well studied. Here, single-molecule microscopy is used to compare the dynamics of two model proteins, α-lactalbumin and lysozyme, at the interface of uncharged polystyrene with varied molecular weights. The two proteins exhibit different surface interaction mechanisms despite having a similar size and structure. α-Lactalbumin exhibits interfacial adsorption-desorption with residence times that depend on polymer molecular weight. Lysozyme undergoes a continuous time random walk at the polystyrene surface with residence times that also depend on the molecular weight of polystyrene. Single-molecule observables suggest that the hindered continuous time random walk dynamics displayed by lysozyme are determined by the polystyrene free volume, a finding supported by thermal annealing and solvent quality studies. Hindered dynamics are dominated by short-range hydrophobic interactions where the contributions of electrostatic forces are negligible. This work establishes a relationship between the microscale structure (i.e., free volume) of polystyrene polymer chains to nanoscale interfacial protein dynamics.
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24
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Kim Y, Yang E, Park H, Choi H. Anti-biofouling effect of a thin film nanocomposite membrane with a functionalized-carbon-nanotube-blended polymeric support for the pressure-retarded osmosis process. RSC Adv 2020; 10:5697-5703. [PMID: 35497439 PMCID: PMC9049229 DOI: 10.1039/c9ra08870a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 01/28/2020] [Indexed: 12/24/2022] Open
Abstract
In this study, the anti-biofouling effect of a thin film nanocomposite (TFN) membrane with a functionalized-carbon-nanotube-blended polymeric support layer was analyzed to determine the applicability of this membrane for the pressure-retarded osmosis (PRO) process. The anti-biofouling property of TFN membranes for the PRO process was characterized by SEM, FTIR, and AFM, as well as contact angle measurements and zeta potential analysis of the bottom side of the support layer. The anti-biofouling effect of the fabricated membrane for the PRO process was analyzed by bacterial attachment tests on the bottom surface of the support layer and biofouling tests in a cross-flow operation system in the PRO mode (AL-DS). The TFN membrane with 0.5 wt% fCNTs exhibited enhanced anti-biofouling properties of the bottom surface of the support layer compared to the bare TFC membrane due to the low roughness, high negative surface charge, and hydrophilicity. Compared to the bare TFC membrane, the support layer of the fCNT0.5-TFN membrane exhibited a 35% decrease in bacterial attachment. In a laboratory-scale biofouling test, the water flux of the fCNT0.5-TFN membrane was ∼10% less than that of the bare TFC membrane in the PRO mode. The anti-biofouling effect and characteristics of a thin film nanocomposite (TFN) membrane with a functionalized-carbon-nanotube-blended polymeric support layer for the pressure-retarded osmosis (PRO) process.![]()
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Affiliation(s)
- Yeji Kim
- School of Earth Science and Environmental Engineering, Gwangju Institute of Science and Technology (GIST) 123 Cheomdangwagi-ro, Buk-gu Gwangju 61005 South Korea .,Center for Membranes, Advanced Materials Division, Korea Research Institute of Chemical Technology (KRICT) Daejeon 34114 South Korea
| | - Eunmok Yang
- School of Earth Science and Environmental Engineering, Gwangju Institute of Science and Technology (GIST) 123 Cheomdangwagi-ro, Buk-gu Gwangju 61005 South Korea .,Center for Membranes, Advanced Materials Division, Korea Research Institute of Chemical Technology (KRICT) Daejeon 34114 South Korea
| | - Hosik Park
- Center for Membranes, Advanced Materials Division, Korea Research Institute of Chemical Technology (KRICT) Daejeon 34114 South Korea
| | - Heechul Choi
- School of Earth Science and Environmental Engineering, Gwangju Institute of Science and Technology (GIST) 123 Cheomdangwagi-ro, Buk-gu Gwangju 61005 South Korea .,Center for Membranes, Advanced Materials Division, Korea Research Institute of Chemical Technology (KRICT) Daejeon 34114 South Korea
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25
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Subramaniam M, Goh P, Sevgili E, Karaman M, Lau W, Ismail A. Hydroxypropyl methacrylate thin film coating on polyvinylidene fluoride hollow fiber membranes via initiated chemical vapor deposition. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2019.109360] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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Morphological, Electrical, and Chemical Characteristics of Poly(sodium 4-styrenesulfonate) Coated PVDF Ultrafiltration Membranes after Plasma Treatment. Polymers (Basel) 2019; 11:polym11101689. [PMID: 31618983 PMCID: PMC6836023 DOI: 10.3390/polym11101689] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 10/08/2019] [Accepted: 10/12/2019] [Indexed: 11/17/2022] Open
Abstract
A commercial ultrafiltration (UF) membrane (HFM-183 de Koch Membrane Systems) made of poly(vinylidene fluoride) (PVDF), was recovered with a negatively-charged polyelectrolyte (poly(sodium 4-styrenesulfonate)) (PSS), and the effects on its electric, chemical, and morphological properties were analyzed. Atomic force microscopy (AFM), liquid–liquid displacement porometry, Electrical Impedance Spectroscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy were used to investigate the modifications induced by the deposition of PSS on the PVDF positively-charged membrane and after its treatment by a radio frequency Ar-plasma. These techniques confirmed a real deposition and posterior compaction of PSS with increasing roughness and decreasing pore sizes. The evolution of the electric resistances of the membranes confirmed crosslinking and compaction with shielding of the sulfonated groups from PSS. In this way, a membrane with a negatively-charged active layer and a pore size which was 60% lower than the original membrane was obtained. The composition of the additive used by manufacturers to modify PVDF to make it positively charged was obtained by different procedures, all of which depended upon the results of X-ray photoelectron spectroscopy, leading to fairly consistent results. This polymer, carrying positive charges, contains quaternary nitrogen, as confirmed by XPS. Moreover, Raman spectroscopy confirmed that PVDF changes from mostly the β to the α phase, which is more stable as a substrate for the deposited PSS. The aim of the tested modifications was to increase the retention of divalent anions without reducing permeability.
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27
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Delavari A, Breite D, Schulze A, Baltus RE. Latex particle rejections from virgin and mixed charged surface polycarbonate track etched membranes. J Memb Sci 2019. [DOI: 10.1016/j.memsci.2019.04.065] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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28
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Electron beam irradiation of polyvinylidene fluoride/polyvinylpyrrolidone ultrafiltration membrane in presence of zwitterions molecules evaluation of filtration performances. Radiat Phys Chem Oxf Engl 1993 2019. [DOI: 10.1016/j.radphyschem.2019.02.029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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29
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Surface Modification on Cellulose Nanofibers by TiO2 Coating for Achieving High Capture Efficiency of Nanoparticles. COATINGS 2019. [DOI: 10.3390/coatings9020139] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Cellulose nanofibers were modified by TiO2 gel layer (~25 nm in thickness) via hydrolysis reaction on the surface of the cellulose nanofibers. After the TiO2 coating, the surface charge of the nanofiber dramatically changed from negative to positive. A high efficiency (~100%) of capturing negatively charged Au nanoparticles (5 nm) was successfully obtained by effectively utilizing the electrostatic interaction of surface charge between the TiO2-coated cellulose nanofibers and Au nanoparticles. Therefore, this technique of surface modification will be potentially used in improving filtration efficiency for membrane applications.
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30
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Nguyen J, Conca DV, Stein J, Bovo L, Howard CA, Llorente Garcia I. Magnetic control of graphitic microparticles in aqueous solutions. Proc Natl Acad Sci U S A 2019; 116:2425-2434. [PMID: 30683726 PMCID: PMC6377480 DOI: 10.1073/pnas.1817989116] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Graphite is an inexpensive material with useful electrical, magnetic, thermal, and optical properties. It is also biocompatible and used universally as a substrate. Micrometer-sized graphitic particles in solution are therefore ideal candidates for novel lab-on-a-chip and remote manipulation applications in biomedicine, biophysics, chemistry, and condensed-matter physics. However, submerged graphite is not known to be amenable to magnetic manipulation, the optimal manipulation method for such applications. Here, we exploit the diamagnetism of graphite and demonstrate contactless magnetic positioning control of graphitic microflakes in diamagnetic aqueous solutions. We develop a theoretical model for magnetic manipulation of graphite microflakes and demonstrate experimentally magnetic transport of such particles over distances [Formula: see text] with peak velocities [Formula: see text] in inhomogeneous magnetic fields. We achieve fully biocompatible transport for lipid-coated graphite in NaCl aqueous solution, paving the way for previously undiscovered biomedical applications. Our results prove that micrometer-sized graphite can be magnetically manipulated in liquid media.
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Affiliation(s)
- Johnny Nguyen
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Dario Valter Conca
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Johannes Stein
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Laura Bovo
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
- London Centre for Nanotechnology, University College London, London WC1H 0AJ, United Kingdom
- Department of Innovation and Enterprise, University College London, London W1T 4TJ, United Kingdom
| | - Chris A Howard
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Isabel Llorente Garcia
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom;
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31
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Sandoval-Olvera IG, González-Muñoz P, Palacio L, Hernández A, Ávila-Rodríguez M, Prádanos P. Ultrafiltration membranes modified by PSS deposition and plasma treatment for Cr(VI) removal. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.08.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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32
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Charge Separating Microfiltration Membrane with pH-Dependent Selectivity. Polymers (Basel) 2018; 11:polym11010003. [PMID: 30959987 PMCID: PMC6401782 DOI: 10.3390/polym11010003] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 12/10/2018] [Accepted: 12/19/2018] [Indexed: 11/16/2022] Open
Abstract
Membrane filters are designed for selective separation of components from a mixture. While separation by size might be the most common approach, other characteristics like charge can also be used for separation as presented in this study. Here, a polyether sulfone membrane was modified to create a zwitterionic surface. Depending on the pH value of the surrounding solution the membrane surface will be either negatively or positively charged. Thus, the charged state can be easily adjusted even by small changes of the pH value of the solution. Charged polystyrene beads were used as model reagent to investigate the pH dependent selectivity of the membrane. It was found that electrostatic forces are dominating the interactions between polystyrene beads and membrane surface during the filtration. This enables a complete control of the membrane's selectivity according to the electrostatic interactions. Furthermore, differently charged beads marked with fluorescent dyes were used to investigate the selectivity of mixtures of charged components. These different components were successfully separated according to their charged state proving the selectivity of the invented membrane.
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33
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Pedersen ML, Jensen TR, Kucheryavskiy SV, Simonsen ME. Investigation of surface energy, wettability and zeta potential of titanium dioxide/graphene oxide membranes. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.07.045] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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34
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Schmidt M, Breite D, Thomas I, Went M, Prager A, Schulze A. Polymer membranes for active degradation of complex fouling mixtures. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2018.06.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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35
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Polyvinylidene fluoride membrane modification via oxidant-induced dopamine polymerization for sustainable direct-contact membrane distillation. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2018.05.035] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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36
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Synthesis of High Crystalline TiO2 Nanoparticles on a Polymer Membrane to Degrade Pollutants from Water. Catalysts 2018. [DOI: 10.3390/catal8090376] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Titanium dioxide (TiO2) is described as an established material to remove pollutants from water. However, TiO2 is still not applied on a large scale due to issues concerning, for example, the form of use or low photocatalytic activity. We present an easily upscalable method to synthesize high active TiO2 nanoparticles on a polyethersulfone microfiltration membrane to remove pollutants in a continuous way. For this purpose, titanium(IV) isopropoxide was mixed with water and hydrochloric acid and treated up to 210 °C. After cooling, the membrane was simply dip-coated into the TiO2 nanoparticle dispersion. Standard characterization was undertaken (i.e., X-ray powder diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, water permeance, contact angle). Degradation of carbamazepine and methylene blue was executed. By increasing synthesis temperature crystallinity and photocatalytic activity elevates. Both ultrasound modification of nanoparticles and membrane pre-modification with carboxyl groups led to fine distribution of nanoparticles. The ultrasound-treated nanoparticles gave the highest photocatalytic activity in degrading carbamazepine and showed no decrease in degradation after nine times of repetition. The TiO2 nanoparticles were strongly bound to the membrane. Photocatalytic TiO2 nanoparticles with high activity were synthesized. The innovative method enables a fast and easy nanoparticle production, which could enable the use in large-scale water cleaning.
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37
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Daems N, Milis S, Verbeke R, Szymczyk A, Pescarmona PP, Vankelecom IFJ. High-performance membranes with full pH-stability. RSC Adv 2018; 8:8813-8827. [PMID: 35539860 PMCID: PMC9082047 DOI: 10.1039/c7ra13663c] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 02/19/2018] [Indexed: 11/21/2022] Open
Abstract
Following current strong demands from, among others, paper, food and mining industries, a novel type of nanofiltration membrane was developed, which displays excellent performance in terms of selectivity/flux with a unique combination of chemical stability over the full (0-14) pH-range and thermal stability up to 120 °C. The membrane consists of polyvinylidene fluoride grafted with polystyrene sulfonic acid. The optimum membrane showed water permeances of 2.4 L h-1 m-2 bar-1 while retaining NaCl, MgSO4 and Rhodamine B (479 Da) for respectively ≈60%, ≈80% and >96%.
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Affiliation(s)
- Nick Daems
- Centre for Surface Chemistry and Catalysis, KU Leuven Celestijnenlaan 200F 3001 Heverlee Belgium
| | - Sam Milis
- Centre for Surface Chemistry and Catalysis, KU Leuven Celestijnenlaan 200F 3001 Heverlee Belgium
| | - Rhea Verbeke
- Centre for Surface Chemistry and Catalysis, KU Leuven Celestijnenlaan 200F 3001 Heverlee Belgium
| | - Anthony Szymczyk
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226 F-35000 Rennes France
| | - Paolo P Pescarmona
- Centre for Surface Chemistry and Catalysis, KU Leuven Celestijnenlaan 200F 3001 Heverlee Belgium
- Chemical Engineering Group, Engineering and Technology Institute Groningen (ENTEG), University of Groningen, Nijenborgh 4 9749 AG Groningen The Netherlands
| | - Ivo F J Vankelecom
- Centre for Surface Chemistry and Catalysis, KU Leuven Celestijnenlaan 200F 3001 Heverlee Belgium
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38
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Hong Anh Ngo T, Mori S, Thi Tran D. Photo-induced grafting of poly(ethylene glycol) onto polyamide thin film composite membranes. J Appl Polym Sci 2017. [DOI: 10.1002/app.45454] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Thu Hong Anh Ngo
- Department of Chemical Technology, Faculty of Chemistry; VNU Hanoi University of Science; 334 Nguyen Trai Road Thanh Xuan District Hanoi 10000 Vietnam
| | - Shinsuke Mori
- Department of Chemical Engineering; Tokyo Institute of Technology; 2-12-1 O-Okayama Meguro-ku Tokyo 152-8552 Japan
| | - Dung Thi Tran
- Department of Chemical Technology, Faculty of Chemistry; VNU Hanoi University of Science; 334 Nguyen Trai Road Thanh Xuan District Hanoi 10000 Vietnam
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Bio-Inspired Polymer Membrane Surface Cleaning. Polymers (Basel) 2017; 9:polym9030097. [PMID: 30970776 PMCID: PMC6432259 DOI: 10.3390/polym9030097] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 03/02/2017] [Accepted: 03/05/2017] [Indexed: 11/24/2022] Open
Abstract
To generate polyethersulfone membranes with a biocatalytically active surface, pancreatin was covalently immobilized. Pancreatin is a mixture of digestive enzymes such as protease, lipase, and amylase. The resulting membranes exhibit self-cleaning properties after “switching on” the respective enzyme by adjusting pH and temperature. Thus, the membrane surface can actively degrade a fouling layer on its surface and regain initial permeability. Fouling tests with solutions of protein, oil, and mixtures of both, were performed, and the membrane’s ability to self-clean the fouled surface was characterized. Membrane characterization was conducted by investigation of the immobilized enzyme concentration, enzyme activity, water permeation flux, fouling tests, porosimetry, X-ray photoelectron spectroscopy, and scanning electron microscopy.
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40
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Yuan Y, Hays MP, Hardwidge PR, Kim J. Surface characteristics influencing bacterial adhesion to polymeric substrates. RSC Adv 2017. [DOI: 10.1039/c7ra01571b] [Citation(s) in RCA: 228] [Impact Index Per Article: 32.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Effective surface area on rough substrates for bacterial adhesion is examined by analyzing the solid area fraction of surfaces, where the bacterial medium is in contact with the solid surface.
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Affiliation(s)
- Yue Yuan
- Department of Apparel, Textiles, and Interior Design
- Kansas State University
- Manhattan
- USA
| | - Michael P. Hays
- Department of Diagnostic Medicine and Pathobiology
- Kansas State University
- Manhattan
- USA
| | - Philip R. Hardwidge
- Department of Diagnostic Medicine and Pathobiology
- Kansas State University
- Manhattan
- USA
| | - Jooyoun Kim
- Department of Apparel, Textiles, and Interior Design
- Kansas State University
- Manhattan
- USA
- Johnson Cancer Research Center
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41
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Breite D, Went M, Prager A, Schulze A. The critical zeta potential of polymer membranes: how electrolytes impact membrane fouling. RSC Adv 2016. [DOI: 10.1039/c6ra19239d] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The zeta potential of membrane surfaces and the resulting electrostatic interactions are determining factors of membrane fouling. This publication presents the impact of salt concentration and pH value on these interactions.
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Affiliation(s)
- D. Breite
- Leibniz Institute of Surface Modification
- Leipzig
- Germany
| | - M. Went
- Leibniz Institute of Surface Modification
- Leipzig
- Germany
| | - A. Prager
- Leibniz Institute of Surface Modification
- Leipzig
- Germany
| | - A. Schulze
- Leibniz Institute of Surface Modification
- Leipzig
- Germany
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42
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Breite D, Went M, Thomas I, Prager A, Schulze A. Particle adsorption on a polyether sulfone membrane: how electrostatic interactions dominate membrane fouling. RSC Adv 2016. [DOI: 10.1039/c6ra13787c] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This study presents a new method focussing on electrostatic interactions during fouling of microfiltration membranes.
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Affiliation(s)
- D. Breite
- Leibniz Institute of Surface Modification
- Leipzig
- Germany
| | - M. Went
- Leibniz Institute of Surface Modification
- Leipzig
- Germany
| | - I. Thomas
- Leibniz Institute of Surface Modification
- Leipzig
- Germany
| | - A. Prager
- Leibniz Institute of Surface Modification
- Leipzig
- Germany
| | - A. Schulze
- Leibniz Institute of Surface Modification
- Leipzig
- Germany
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43
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Ray SS, Chen SS, Li CW, Nguyen NC, Nguyen HT. A comprehensive review: electrospinning technique for fabrication and surface modification of membranes for water treatment application. RSC Adv 2016. [DOI: 10.1039/c6ra14952a] [Citation(s) in RCA: 198] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The review paper discusses the surface modification and fabrication of electrospun nanofibers for wastewater treatment.
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Affiliation(s)
- Saikat Sinha Ray
- Institute of Environmental Engineering and Management
- National Taipei University of Technology
- Taipei-10608
- Taiwan
| | - Shiao-Shing Chen
- Institute of Environmental Engineering and Management
- National Taipei University of Technology
- Taipei-10608
- Taiwan
| | - Chi-Wang Li
- Department of Water Resources and Environmental Engineering
- TamKang University
- New Taipei City 25137
- Republic of China
| | - Nguyen Cong Nguyen
- Institute of Environmental Engineering and Management
- National Taipei University of Technology
- Taipei-10608
- Taiwan
- Faculty of Environment and Natural Resources
| | - Hau Thi Nguyen
- Institute of Environmental Engineering and Management
- National Taipei University of Technology
- Taipei-10608
- Taiwan
- Faculty of Environment and Natural Resources
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