Characterization and Antibiofouling Performance Investigation of Hydrophobic Silver Nanocomposite Membranes: A Comparative Study

Amouamouha, Maryam; Gholikandi, Gagik Badalians

doi:10.3390/membranes7040064

Cited by 26 publications

(7 citation statements)

References 47 publications

(64 reference statements)

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“…This phenomenon could be the result of the metal, such as silver coordinated with atoms like halogen, hydro in the structure of the membrane and produces the characteristic infrared band and might be the mechanism that AgNPs attached to the membrane. Some previous studies that described the same phenomenon when modified PVDF membrane with silver or other metal [23,25,26]. On the unmodified membrane in the operation mode, a new band stretching was detected at 2930 cm −1 , attributed to C-H 2 group from the organic compounds [24], indicating the growth of organic compounds.…”

Section: Resultssupporting

confidence: 58%

Exploring Nanosilver-Coated Hollow Fiber Microfiltration to Mitigate Biofouling for High Loading Membrane Bioreactor

Sowe

Chen

et al. 2019

Molecules

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For the first time, a nanosilver-coated hollow fiber microfiltration (MF) was fabricated by a simple chemical reduction method, then tested for membrane biofouling mitigation study under extreme high mixed liquor suspended solid (MLSS) concentration for long term. This study presents a simple and novel technique to modify a commercially available MF membrane using silver nanoparticles (AgNPs) followed by an investigation of mitigating membrane biofouling potentials using this modified membrane to compare with an unmodified membrane for 60-day operation period. The modified membranes showed that AgNPs was attached to the MF-membrane successfully with a high density of 119.85 ± 5.42 mg/m2. After long-term testing of 60 days in membrane bioreactor with a MLSS concentration of 11,000 mg/L, specific flux of the AgNPs coated MF (AgNPs-MF) decreased 59.7%, while the specific flux of the unmodified membrane dropped 81.8%, resulted from the increase of transmembrane vacuum pressure for the AgNPs-MF was lower than that of the unmodified one. The resistance-in-series model was used to calculate the resistance coefficients of membrane modules, and the result showed that the cake layer resistance coefficient of the unmodified membrane was 2.7 times higher than that of the AgNPs-MF after the 60-day operation, confirming that AgNPs displayed great antimicrobial properties to mitigate membrane biofouling under such high MLSS.

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Section: Resultssupporting

confidence: 58%

Exploring Nanosilver-Coated Hollow Fiber Microfiltration to Mitigate Biofouling for High Loading Membrane Bioreactor

Sowe

Chen

et al. 2019

Molecules

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“…The PVDF membrane was kept while performing XRD measurements, in order to ensure a sufficient rigidity to rGO membranes and to prevent potential damages or corrugation during the analysis [23]. Therefore, it may be also possible to assign the reflection at 26.7° 2θ to the monoclinic αphase of PVDF, resulting in an overlap with one of the graphites [33][34][35].…”

Section: Membranes Characterizationmentioning

confidence: 99%

“…Therefore, it may be also possible to assign the reflection at 26.7 • 2θ to the monoclinic α-phase of PVDF, resulting in an overlap with one of the graphites [33][34][35].…”

Section: Membranes Characterizationmentioning

confidence: 99%

Reduced Graphene Oxide Membranes as Potential Self-Assembling Filter for Wastewater Treatment

et al. 2020

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This work focuses on the investigation of the capability of reduced graphene oxide (rGO) filters to remove metals from various wastewater. The process to produce rGO membranes is reported and discussed, as well as their ability to capture ions in complex solutions, such as tap or industrial wastewater. Multi-ion solutions, containing Cu2+, Fe3+, Ni2+, and Mn2+ to simulate mine wastewater, or Ca2+ and Mg2+ to mimic drinkable water, were used as models. In mono-ionic solutions, the best capture efficiency values were proved for Ca2+, Fe3+, and Ni2+ ions, while a matrix effect was found for multi-ion solutions. However, interesting capture efficiencies were measured in the range of 30–90%, depending on the specific ion, for both single and multi-ion solutions. An attempt is proposed to correlate ions capture efficiency with ions characteristics, such as ionic radius or charge. Combining a satisfactory capture efficiency with low costs and ease of treatment unit operations, the approach here proposed is considered promising to replace other more complex and expensive filtration techniques.

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“…Relatively high pressures are required to generate sufficient flux through conventional polymeric membranes which are hydrophobic in nature and have low affinity for water molecules [1]. Many attempts have been made to render membranes hydrophilic [2,3]. For example, Zhang et al blended hydrophilic polyvinyl alcohol (PVA) polymer with hydrophobic polyvinylidene fluoride (PVDF) to increase the hydrophilicity of a casted membrane [4].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a High Flux Nanocellulose–Cellulose Acetate Nanocomposite Membrane

Zheng

Yang

et al. 2019

Membranes

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Despite the advantages of membrane processes, their high energy requirement remains a major challenge. Fabrication of nanocomposite membranes by incorporating various nanomaterials in the polymer matrix has shown promise for enhancing membrane flux. In this study, we embed functionalized cellulose nanofibers (CNFs) with high aspect ratios in the polymer matrix to create hydrophilic nanochannels that reduce membrane resistance and facilitate the facile transport of water molecules through the membrane. The results showed that the incorporation of 0.1 wt % CNF into the polymer matrix did not change the membrane flux (~15 L · m − 2 · h − 1 ) and Bovine Serum Albumin (BSA) Fraction V rejection, while increasing the CNF content to 0.3 wt % significantly enhanced the flux by seven times to ~100 L · m − 2 · h − 1 , but the rejection was decreased to 60–70%. Such a change in membrane performance was due to the formation of hydrophilic nanochannels by the incorporation of CNF (corroborated by the SEM images), decreasing the membrane resistance, and thus enhancing the flux. When the concentration of the CNF in the membrane matrix was further increased to 0.6 wt %, no further increase in the membrane flux was observed, however, the BSA rejection was found to increase to 85%. Such an increase in the rejection was related to the electrostatic repulsion between the negatively-charged CNF-loaded nanochannels and the BSA, as demonstrated by zeta potential measurements. SEM images showed the bridging effect of the CNF in the nanochannels with high CNF contents.

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Characterization and Antibiofouling Performance Investigation of Hydrophobic Silver Nanocomposite Membranes: A Comparative Study

Cited by 26 publications

References 47 publications

Exploring Nanosilver-Coated Hollow Fiber Microfiltration to Mitigate Biofouling for High Loading Membrane Bioreactor

Exploring Nanosilver-Coated Hollow Fiber Microfiltration to Mitigate Biofouling for High Loading Membrane Bioreactor

Reduced Graphene Oxide Membranes as Potential Self-Assembling Filter for Wastewater Treatment

Synthesis and Characterization of a High Flux Nanocellulose–Cellulose Acetate Nanocomposite Membrane

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