Enhanced permeation performance with incorporation of silver nitrate onto polymeric membrane

Said, Khairul Anwar Mohamad; Jama’in, Ramizah Liyana; Sutan, N.S. M.; Alipah, Nurul Ain Mohamed

doi:10.15282/jmes.12.3.2018.5.0336

Cited by 5 publications

(2 citation statements)

References 72 publications

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“…The PWF of PVA-UV was comparable to PVA-Ag at 2.09 ± 0.21 L/m 2 ·h, a 24% decrease from PVA-2.5. Results showing that the attachment of silver onto the membrane yields a lower pure water flux were also reported by investigators who performed an extensive study on polysulfone ultrafiltration membranes [ 42 , 43 ]. As explained by Sawada et al and Koseoglu-Imer et al, the decline in PWF can be attributed to the barrier effect promoted by the presence of silver particles on the membrane surface and pores [ 44 , 45 ].…”

Section: Resultssupporting

confidence: 65%

Development and Characterization of Membranes with PVA Containing Silver Particles: A Study of the Addition and Stability

et al. 2020

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Developing technologies for the reduction of biofouling and enhancement of membrane functionality and durability are challenging but critical for the advancement of water purification processes. Silver (Ag) is often used in the process of purification due to its anti-fouling properties; however, the leaching of this metal from a filtration membrane significantly reduces its effectiveness. Our study was designed to integrate the positive characteristics of poly vinyl alcohol (PVA) with the controlled incorporation of nano-scale silver ions across the membrane. This approach was designed with three goals in mind: (1) to improve antifouling activity; (2) to prevent leaching of the metal; and (3) to extend the durability of the functionalized membrane. The fabrication method we used was a modified version of manual coating in combination with sufficient pressure to ensure impregnation and proper blending of PVA with cellulose acetate. We then used the spin coater to enhance the cross-linking reaction, which improved membrane durability. Our results indicate that PVA acts as a reducing agent of Ag+ to Ag0 using X-ray photoelectron spectroscopy analysis and demonstrate that the metal retention was increased by more than 90% using PVA in combination with ultraviolet-photo-irradiated Ag+ reduced to Ag0. The Ag+ ions have sp hybrid orbitals, which accept lone pairs of electrons from a hydroxyl oxygen atom, and the covalent binding of silver to the hydroxyl groups of PVA enhanced retention. In fact, membranes with reduced Ag displayed a more effective attachment of Ag and a more efficient eradication of E. coli growth. Compared to pristine membranes, bovine serum albumin (BSA) flux increased by 8% after the initial addition of Ag and by 17% following ultraviolet irradiation and reduction of Ag, whereas BSA rejection increased by 10% and 11%, respectively. The implementation of this hybrid method for modifying commercial membranes could lead to significant savings due to increased metal retention and membrane effectiveness. These enhancements would ultimately increase the membrane’s longevity and reduce the cost/benefit ratio.

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Section: Resultssupporting

confidence: 65%

Development and Characterization of Membranes with PVA Containing Silver Particles: A Study of the Addition and Stability

et al. 2020

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“…This led to the emergence of a large number of research activities involving electrospun nanofibres for different applications such as tissue engineering and drug delivery [29,30], enzyme immobilisation [31], acoustical damping [32], battery electrodes [33], photocatalysis [34], super-capacitors [35]. The achieved nanofibres were always accompanied by some characteristics like the very large surface area to volume ratio, flexibility in surface functionalities, superior mechanical performance, and versatility of design, which made them optimal candidates for a broad range of applications in biomedical device [36], composites [37], sensors [38], water filtration and wastewater treatment [39][40][41], and nano-composite membrane [42].…”

Section: Properties Of Nano Fibre Filtration Materialsmentioning

confidence: 99%

Material Properties Analysis with Addition of Nanofibres for Air Intake Filtration in Internal Combustion Engines

Dziubak¹

2021

IJAME

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The aim of this study is to provide an experimental properties evaluation of a standard filter material (cellulose) and materials with fiber layer addition with small diameters (nanofibers). Filter media, including cellulose, used in the internal combustion engine inlet air filtration are made of high diameter fibres, approx. 15 µm. Significantly higher separation and filtration efficiency performance are obtained for materials with lower fibre diameters (nanofibres), however, at the expense of a significantly higher pressure drop, affecting the engine performance. Filter media manufacturers mainly specify the structure parameters (pore size, air permeability and thickness), without giving any information on the dust filtration performance and rate. The literature includes test results for models of different filter media structures. Filtration process modelling using polydisperse dust with particles of different shape and density and irregular filter media structure is possible using advanced computer techniques, however, the process is complex and requires many simplifications. Test results can be applied directly in the automotive industry. The data can be obtained by experimental tests on filter medium specimens, complete filter elements or air filters which are costly and time-consuming tests, however, those test methods are the most reliable. Conditions and testing methodology for intake air filter materials used in internal combustion engines were developed. Filtration and flow resistance efficiency and accuracy were done depending on test dust mass stopped per unit area. Tested materials filtration efficiency was assessed by a filtration quality factor, which includes experimentally determined efficiency and accuracy as well as flow resistance values. Much higher efficiency and filtration accuracy of dust grains below 5 µm in filtration materials with nanofibers addition compared to standard filtration material (filter paper) were demonstrated. For the same flow resistance values, filter materials with nanofibers addition accumulate smaller dust mass than standard filter paper. Usage of materials with nanofibers addition used in motor vehicles intake air filtration ensures their high efficiency and accuracy. It minimises its components wear, but at the expense of faster flow resistance increase, which shortens filter life and increases filter replacement frequency. Results obtained during the experimental research partly fill the gap when it comes to the basic material properties used in internal combustion engines intake air filter partitions production.

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Development and physico-chemical characterization of Polyvinylidene fluoride (PVDF) flat sheet membranes with antibacterial properties against E. coli and S. aureus

Escorial

Lanzanas

Berjamin

et al. 2020

J. Phys.: Conf. Ser.

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The use of silver-modified montmorillonite (Ag-MMT) nanoclay from local montmorillonite ore as an additive for the development of PVDF flat sheet membranes with antibacterial properties for use in water disinfection was the focus of this study. It covers the development of PVDF flat sheet membranes with Ag-MMT nanoclay. The physico-chemical characterization was done through XRD, AFM, contact angle measurement, and FE-SEM while the antibacterial properties against gram-positive S. aureus and gram-negative E. coli were through inhibition zone and contact inhibition assessment. XRD results showed exfoliation of the Ag-MMT nanoclay in the PVDF flat sheet membrane, with minimal intercalations and similar functional group interactions. AFM results showed an increased surface roughness for every increase in Ag-MMT nanoclay which correlates to the contact angle measurement of membranes, demonstrating high contact angle measurement and high hydrophobicity for rougher surfaces, showing high hydrophilicity for the 0.250% Ag-MMT nanoclay membrane with a contact angle of 79.5 degrees. FE-SEM results reveal the morphology of the membrane. All experimental membranes are negative in contact inhibition against E. coli and S. aureus. However, the Ag-MMT nanoclay has been found to have antibacterial properties with the formation of inhibition zones, showing a higher sensitivity against E. coli.

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Enhanced permeation performance with incorporation of silver nitrate onto polymeric membrane

Cited by 5 publications

References 72 publications

Development and Characterization of Membranes with PVA Containing Silver Particles: A Study of the Addition and Stability

Development and Characterization of Membranes with PVA Containing Silver Particles: A Study of the Addition and Stability

Material Properties Analysis with Addition of Nanofibres for Air Intake Filtration in Internal Combustion Engines

Development and physico-chemical characterization of Polyvinylidene fluoride (PVDF) flat sheet membranes with antibacterial properties against E. coli and S. aureus

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