Preparation and characterization of PVDF/CaCO3 composite membranes etched by hydrochloric acid

Bei, Pengzhi; Liu, Hongjing; Ye, Hui; Hu, Aijun; Sun, Yong; Guo, Liying

doi:10.1007/s11356-019-06402-5

Cited by 15 publications

(3 citation statements)

References 54 publications

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“…Acids seem to have very little effect on PVDF. Hydrochloric acid (HCl), humic acid (HA) and sulphuric acid (H

) have been tested in varying concentrations, each showing no reaction with PVDF [ 260 , 261 ]. This, coupled with the dearth of literature concerning reactions of PVDF with acids suggests that PVDF is stable in low-pH environments.…”

Section: Pvdf Stabilitymentioning

confidence: 99%

On the Solubility and Stability of Polyvinylidene Fluoride

et al. 2021

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This literature review covers the solubility and processability of fluoropolymer polyvinylidine fluoride (PVDF). Fluoropolymers consist of a carbon backbone chain with multiple connected C–F bonds; they are typically nonreactive and nontoxic and have good thermal stability. Their processing, recycling and reuse are rapidly becoming more important to the circular economy as fluoropolymers find widespread application in diverse sectors including construction, automotive engineering and electronics. The partially fluorinated polymer PVDF is in strong demand in all of these areas; in addition to its desirable inertness, which is typical of most fluoropolymers, it also has a high dielectric constant and can be ferroelectric in some of its crystal phases. However, processing and reusing PVDF is a challenging task, and this is partly due to its limited solubility. This review begins with a discussion on the useful properties and applications of PVDF, followed by a discussion on the known solvents and diluents of PVDF and how it can be formed into membranes. Finally, we explore the limitations of PVDF’s chemical and thermal stability, with a discussion on conditions under which it can degrade. Our aim is to provide a condensed overview that will be of use to both chemists and engineers who need to work with PVDF.

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“…Acids seem to have very little effect on PVDF. Hydrochloric acid (HCl), humic acid (HA) and sulphuric acid (H

Section: Pvdf Stabilitymentioning

confidence: 99%

On the Solubility and Stability of Polyvinylidene Fluoride

et al. 2021

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“…For M1, M2, and M3, the full width half maximum (FWHM) values were smaller (8.65 nm for M1, 6.82 nm for M2, and 6.02 nm for M3) than that of M0 (an FWHM of 16.31 nm), exhibiting more uniform size distributions. This is because the addition of nano-CaCO 3 increased the viscosity of the casting solution (Figure ), which limited the migration of polymer chains, thereby slowing down the phase inversion rate and making the membrane pore smaller and more uniform. , More importantly, the produced CO 2 nanobubbles were amphiphobic to water and solvents to slow down the mutual diffusion between DMAc and H 2 O, which further delayed the phase inversion time to ultimately optimize the membrane pore-size distribution . The pore-size distributions of M4 and M5 were gradually widened again, with FWHM values of 9.29 and 23.47 nm, respectively.…”

Section: Results and Discussionmentioning

confidence: 99%

Preparation of Small-Pore Ultrafiltration Membranes with High Surface Porosity by In Situ CO₂ Nanobubble-Assisted NIPS

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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The fabrication of ultrafiltration (UF) membranes with a small pore size (<20 nm) and high surface porosity is still a great challenge. In this work, a nanobubble-assisted nonsolventinduced phase separation (BNIPS) technique was developed to prepare high-performance UF membranes by adding a tiny amount of CaCO 3 nanoparticles into the casting solution. The phase inversion occurred in a dilute-acid coagulation bath to simultaneously generate CO 2 nanobubbles, which regulated the membrane structure. The effects of the nano-CaCO 3 content in the casting solution on the structure and performance of poly(ethersulfone)/sulfonated polysulfone (PES/SPSf) UF membranes were studied. The UF membrane prepared from a casting solution with 0.3% nano-CaCO 3 achieved a surface porosity of 12%, a pore diameter of 10.2 nm, and a skin-layer thickness of 80.3 nm. The superior structure of the UF membrane was mainly attributed to the in situ generation of CO 2 nanobubbles because the CO 2 nanobubbles were amphiphobic to water and solvents to delay the phase inversion time and acted as nanosize porogens. The produced membrane showed an unprecedented separation performance, achieving a pure water permeance of up to 1128 L•m −2 •h −1 • bar −1 , 2.5 fold that of the control membrane. Similarly, a high bovine serum albumin rejection of above 99.0% was obtained. The overall permeability and selectivity were better than those of commercial and other previously reported UF membranes. This work provides insight toward a simple and cost-effective technique to address the trade-off between pure water permeance and solute rejection of UF membranes.

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“…PVDF is an attractive polymeric material in general and for membrane production − in particular because of its chemical, thermal, and mechanical stability. , The semicrystalline nature of PVDF allows for high adjustability of the phases and morphology present in solid PVDF material . In general, the crystalline content is about 50%.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Diclofenac and Its UV Phototransformation Products in an Aqueous Solution on PVDF: A Molecular Modeling Study

Hafner,

Klein,

Urbassek

2023

J. Phys. Chem. B

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The presence of pharmaceuticals in drinking water has generated considerable scientific interest in potential improvements to polymeric membranes for water purification at the nanoscale. In this work, we investigate the adsorption of diclofenac and its ultraviolet (UV) phototransformation products on amorphous and crystalline poly(vinylidene difluoride) (PVDF) membrane surfaces at the nanoscale using molecular modeling. We report binding affinities by determining the free energy landscape via the extended adaptive biasing force method. The high binding affinities of the phototransformation products found are consistent with qualitative experimental results. For diclofenac, we found similar or better affinities than those for the phototransformation products, which seems to be in contrast to the experimental findings. This discrepancy can only be explained if the maximum adsorption density of diclofenac is much lower than that of the products. Overall, negligible differences between the adsorption affinities of the crystalline phases are observed, suggesting that no tuning of the PVDF surfaces is necessary to optimize filtration capabilities.

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Preparation and characterization of PVDF/CaCO3 composite membranes etched by hydrochloric acid

Cited by 15 publications

References 54 publications

On the Solubility and Stability of Polyvinylidene Fluoride

On the Solubility and Stability of Polyvinylidene Fluoride

Preparation of Small-Pore Ultrafiltration Membranes with High Surface Porosity by In Situ CO₂ Nanobubble-Assisted NIPS

Adsorption of Diclofenac and Its UV Phototransformation Products in an Aqueous Solution on PVDF: A Molecular Modeling Study

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Preparation and characterization of PVDF/CaCO3 composite membranes etched by hydrochloric acid

Cited by 15 publications

References 54 publications

On the Solubility and Stability of Polyvinylidene Fluoride

On the Solubility and Stability of Polyvinylidene Fluoride

Preparation of Small-Pore Ultrafiltration Membranes with High Surface Porosity by In Situ CO2 Nanobubble-Assisted NIPS

Adsorption of Diclofenac and Its UV Phototransformation Products in an Aqueous Solution on PVDF: A Molecular Modeling Study

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Preparation of Small-Pore Ultrafiltration Membranes with High Surface Porosity by In Situ CO₂ Nanobubble-Assisted NIPS