Biofouling reduction for improvement of depth water filtration. Filter production and testing

Sztuk-Sikorska, E.; Gradoń, Leon

doi:10.1515/cpe-2016-0026

Cited by 8 publications

(6 citation statements)

References 11 publications

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“…Glass flasks of 200 mL were from Simax. Multilayer polypropylene (PP) filters were produced in-house using the melt-blown technology process as reported by Sikorskaet al [ 37 ]. The sulfonated pentablock copolymer poly(tBS–HI–sS:S–HI–tBS) solution, or s-PBC, with 10–12 wt% polymer in a cyclohexane/heptane mixed solvent was provided by courtesy of Kraton Polymers LLC (Houston, TX, USA).…”

Section: Methodsmentioning

confidence: 99%

Innovative Antibiofilm Smart Surface against Legionella for Water Systems

Filice

Sciuto

Faro³

et al. 2022

Microorganisms

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Legionella pneumophila contamination of water systems is a crucial issue for public health. The pathogen is able to persist in water as free-living planktonic bacteria or to grow within biofilms that adhere to and clog filters and pipes in a water system, reducing its lifespan and, in the case of hospital buildings, increasing the risk of nosocomial infections. The implementation of water management is considered to be the main prevention measure and can be achieved from the optimization of water system architecture, notably introducing new materials and strategies to contrast Legionella biofilm proliferation and so prolong the water system functionality. In this research, we propose a new smart surface against L. pneumophila biofilm formation. This is based on an innovative type of coating consisting of a sulfonated pentablock copolymer (s-PBC, commercially named Nexar™) deposited on top of a polypropylene (PP) coupon in a sandwich filter model. The covering of PP with s-PBC results in a more hydrophilic, acid, and negatively charged surface that induces microbial physiological inhibition thereby preventing adhesion and/or proliferation attempts of L. pneumophila prior to the biofilm formation. The antibiofilm property has been investigated by a Zone of Inhibition test and an in vitro biofilm formation analysis. Filtration tests have been performed as representative of possible applications for s-PBC coating. Results are reported and discussed.

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Section: Methodsmentioning

confidence: 99%

Innovative Antibiofilm Smart Surface against Legionella for Water Systems

Filice

Sciuto

Faro³

et al. 2022

Microorganisms

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“…Polypropylene (PP) filters were produced using the melt-blown technology process, as reported in [35]. The fibers have a diameter smaller than 5 µm and create a three-dimensional network.…”

Section: Methodsmentioning

confidence: 99%

Sulfonated Pentablock Copolymer with Graphene Oxide for Co2+ Ions Removal: Efficiency, Interaction Mechanisms and Secondary Reaction Products

Filice,

Scuderi,

Zimbone

et al. 2023

Coatings

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In this work, sulfonated pentablock copolymer (s-PBC) and s-PBC mixed with graphene oxide (s-PBC_GO) layers were deposited on polypropylene (PP) fibrous filters and tested as active coatings for the removal of cobalt ions from water using adsorption and filtration processes. Some of the coated filters were treated by UV light irradiation to modify their hydrophilic properties. The filters were characterized, before and after the processes, by energy-dispersive X-ray (EDX) analysis and Fourier transform infrared spectroscopy (FT-IR). The Qt (mg/g) values, defined as the weight ratio between the removed ions and the coating layer, were evaluated. In the case of adsorption processes, the best results for the removal of Co2+ ions were achieved by the s-PBC_GO coating, with a Qt of 37 mg/g compared to 21 mg/g obtained by the s-PBC. This was ascribed to the presence of GO, which contains more favorable sites able to adsorb positive ions from the solution. Vice versa, for filtration processes, the s-PBC coated filters show similar or slightly better results than the s-PBC_GO coated ones. Such differences can be ascribed to the shorter contact time between the solution and the coating layer in the case of filtration, with respect to adsorption processes, thus reducing the chance for the ions to be adsorbed on the GO layers before passing through the filter. A collateral effect, observed in this study and enhanced in the case of UV-treated coatings, is the release of radical oxysulfur species. The mechanisms involved in this effect are discussed and identified as a consequence of the interaction between the coating layers and metal ions. In order to identify the mechanism of oxysulfur radicals formation and considering a water sample closer to real water, the Co2+ ions adsorption experiments were conducted in the presence of a competitive organic contaminant (i.e., methyl orange, MO).

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“…Glass flasks of 200 mL were from Simax. Multilayer polypropylene (PP) filters were in house produced using the melt-blown technology process as reported in [46] and described in the Supporting Information within a scheme of the process (see Figure S1). A sulfonated pentablock copolymer poly(tBS-HI-sS:S-HI-tBS) solution, or s-PBC, with 10-12 wt% polymer in a cyclohexane/heptane mixed solvent was provided by courtesy of Kraton Polymers LLC (Houston, Texas, USA).…”

Section: Chemicalsmentioning

confidence: 99%

Antimicrobial s-PBC Coatings for Innovative Multifunctional Water Filters

et al. 2020

Self Cite

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Biological contamination is a typical issue in water treatment. Highly concentrated microbial suspensions in a water flow may cause filter occlusion and biofilm formation, affecting the lifespan and quality of water purification systems and increasing the risk of nosocomial infections. In order to contrast the biofilm formation, most of the conventional strategies rely on the water chemical modification and/or on the use of filters functional coatings. The former is unsafe for huge chemicals spilling required; therefore, we focus on the second approach and we propose the use of a sulfonated pentablock copolymer (s-PBC, commercially named Nexar™) as innovative multifunctional coating for improving the performance of commercial water filters. S-PBC-coated polypropylene (PP) samples were tested against the pathogen Pseudomonas aeruginosa. The covering of PP with s-PBC results in a more hydrophilic, acid, and negatively charged surface. These properties avoid the adhesion and proliferation attempts of planktonic bacteria, i.e., the biofilm formation. Inhibition tests were performed on the as-modified filters and an evident antibacterial activity was observed. The results point out the possibility of using NexarTM as coating layer for filters with antifouling properties and a simultaneous ability to remove bacteria and cationic dyes from water.

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Biofouling reduction for improvement of depth water filtration. Filter production and testing

Cited by 8 publications

References 11 publications

Innovative Antibiofilm Smart Surface against Legionella for Water Systems

Innovative Antibiofilm Smart Surface against Legionella for Water Systems

Sulfonated Pentablock Copolymer with Graphene Oxide for Co2+ Ions Removal: Efficiency, Interaction Mechanisms and Secondary Reaction Products

Antimicrobial s-PBC Coatings for Innovative Multifunctional Water Filters

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