Preparation of hydrophilic polyvinylidene fluoride/polyvinyl alcohol ultrafiltration membrane via polymer/non-solvent co-induced phase separation method towards enhance anti-fouling performance

Lu, Qingchen; Li, Nana

doi:10.1016/j.jece.2021.106431

Cited by 26 publications

(8 citation statements)

References 56 publications

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“…In this regard, thanks to its functionalities, it represents a potential adsorbent system for different common and emerging pollutants such as heavy metals, anionic organic dyes, and macromolecules [87,88]. By easy casting or non-solvent-induced phase inversion techniques, it is possible from a gel to obtain thin films for ultra-nanofiltration approaches based on chitosan and other polymeric functional blends [40,89,90]. Additionally, due to their negatively charged surfaces, high surface area, swelling capacity (particularly the bentonite and montmorillonite clays), cation exchange capacity, and strong adsorption/absorption properties, clays find a huge application in the field of environmental remediation [91,92].…”

Section: System Preparation Methods Filtration Process Pollutant Trea...mentioning

confidence: 99%

Development of Functional Hybrid Polymers and Gel Materials for Sustainable Membrane-Based Water Treatment Technology: How to Combine Greener and Cleaner Approaches

Rando

Sfameni

Plutino

2022

Gels

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Water quality and disposability are among the main challenges that governments and societies will outside during the next years due to their close relationship to population growth and urbanization and their direct influence on the environment and socio-economic development. Potable water suitable for human consumption is a key resource that, unfortunately, is strongly limited by anthropogenic pollution and climate change. In this regard, new groups of compounds, referred to as emerging contaminants, represent a risk to human health and living species; they have already been identified in water bodies as a result of increased industrialization. Pesticides, cosmetics, personal care products, pharmaceuticals, organic dyes, and other man-made chemicals indispensable for modern society are among the emerging pollutants of difficult remediation by traditional methods of wastewater treatment. However, the majority of the currently used waste management and remediation techniques require significant amounts of energy and chemicals, which can themselves be sources of secondary pollution. Therefore, this review reported newly advanced, efficient, and sustainable techniques and approaches for water purification. In particular, new advancements in sustainable membrane-based filtration technologies are discussed, together with their modification through a rational safe-by-design to modulate their hydrophilicity, porosity, surface characteristics, and adsorption performances. Thus, their preparation by the use of biopolymer-based gels is described, as well as their blending with functional cross-linkers or nanofillers or by advanced and innovative approaches, such as electrospinning.

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Section: System Preparation Methods Filtration Process Pollutant Trea...mentioning

confidence: 99%

Development of Functional Hybrid Polymers and Gel Materials for Sustainable Membrane-Based Water Treatment Technology: How to Combine Greener and Cleaner Approaches

Rando

Sfameni

Plutino

2022

Gels

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“…Therefore, the surface of the membrane M000 was relatively dense. The instantaneous liquid-liquid phase separation occurred in the sublayer of membrane M000 to form a finger-like macropore structure (Lu & Li, 2021).…”

Section: Morphological Structure Of Pvdf Membranesmentioning

confidence: 99%

Effect of chitosan crosslinking time on the structure and antifouling performance of polyvinylidene fluoride membrane by surface gelation‐immersion precipitation phase inversion

Sun,

Xu,

et al. 2024

Water Environment Research

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Polyvinylidene fluoride (PVDF) porous membrane was prepared by a two‐step method of surface gelation‐immersion precipitation phase inversion. Chitosan/acetic acid solution and glutaraldehyde aqueous solution were sequentially sprayed onto the surface of the PVDF solution film, with chitosan crosslinking and gelation occurring simultaneously on the film surface. The solution film was then immersed in a coagulation bath to obtain a modified PVDF porous membrane. The effect of the crosslinking time of chitosan and glutaraldehyde on the structure and properties of the PVDF porous membrane was discussed. The results showed that with the prolongation of crosslinking time, the surface structure of the membrane changed from a dense skin layer to a porous structure; the porosity and the mean pore size of the modified PVDF membranes increased first and then decreased, and the contact angle gradually decreased. When the crosslinking time extended to 15 min, the water flux of modified membrane (M153) reached a maximum value. BSA dynamic cyclic filtration experiment showed that the retention rate (R) of the modified membrane was significantly improved, compared to 68.3% retention rate of the blank membrane (M000), but the crosslinking time had little effect on the retention rates of the four modified membranes. The antifouling data showed that the flux recovery rate of the blank membrane was 73.0%, while the flux recovery rate of the modified membrane can reach as high as 84.40%, and the irreversible pollution rate of the blank membrane was 27.7%, while the irreversible pollution rate of the modified membrane reduced to 15.6%. These results indicated that, after surface chitosan crosslinking, the hydrophilicity and antifouling properties of PVDF membranes were improved.Practitioner Points Modified PVDF membranes with crosslinking CS coating were prepared by a two‐step method of surface gelation‐immersion precipitation phase inversion. ‐OH groups and ‐NH2 groups of CS coating improve the hydrophilicity and the antifouling property of modified PVDF membranes. Modified PVDF membranes had larger mean pore size and higher porosity than unmodified membrane. Flux recovery rates of the modified membranes were higher than that of unmodified membrane. Pollution degree, reversible pollution rate, and irreversible pollution rate of modified membranes were lower than those of unmodified membrane.

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“…Therefore, the surface of the membrane M000 was relatively dense. The instantaneous liquid-liquid phase separation happened in the sublayer of membrane M000 to form a ngerlike macropore structure [31].…”

Section: Morphological Structure Of Pvdf Membranesmentioning

confidence: 99%

Effect of chitosan gelation time on the structure and antifouling performance of PVDF membrane

Sun

et al. 2023

Preprint

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Polyvinylidene fluoride (PVDF) porous membrane was prepared were prepared by a two-step method of surface gelation-immersion precipitation phase inversion. The surface of the scraping PVDF solution film was sprayed with acetic acid solution of chitosan （CS） and glutaraldehyde aqueous solution successively, and the film surface gelled with chitosan crosslinking. And then the liquid film was immersed in coagulation bath water for phase transformation to obtain the modified PVDF porous membranes. The influence of crosslinking degree of chitosan and glutaraldehyde on the structure and properties of PVDF porous membrane was discussed by controlling the gelation time. The results showed that with the extension of gel time, the surface structure of PVDF membranes changed from dense cortex to porous structure, the porosity gradually decreased, the average pore size first increased and then decreased, the contact angle gradually decreased, and the pure water flux first increased and then decreased. The dynamic circulating filtration experiment of bovine serum albumin (BSA) solution showed that the rejection rate of the modified membrane increased from 68.3% to 90.0%, and the flux recovery rate increased from 73.0% to 84.4%, the irreversible fouling ratio decreased from 27.7% to 15.6%. Therefore, the hydrophilicity and antifouling of PVDF membrane were improved after surface chitosan crosslinking.

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Preparation of hydrophilic polyvinylidene fluoride/polyvinyl alcohol ultrafiltration membrane via polymer/non-solvent co-induced phase separation method towards enhance anti-fouling performance

Cited by 26 publications

References 56 publications

Development of Functional Hybrid Polymers and Gel Materials for Sustainable Membrane-Based Water Treatment Technology: How to Combine Greener and Cleaner Approaches

Development of Functional Hybrid Polymers and Gel Materials for Sustainable Membrane-Based Water Treatment Technology: How to Combine Greener and Cleaner Approaches

Effect of chitosan crosslinking time on the structure and antifouling performance of polyvinylidene fluoride membrane by surface gelation‐immersion precipitation phase inversion

Effect of chitosan gelation time on the structure and antifouling performance of PVDF membrane

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