Effects of Non-Ionic Micelles on the Acid-Base Equilibria of a Weak Polyelectrolyte

Yekymov, Evgenee; Attia, David; Levi‐Kalisman, Yael; Bitton, Ronit; Yerushalmi‐Rozen, Rachel

doi:10.3390/polym14091926

Cited by 4 publications

(2 citation statements)

References 64 publications

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“…Since macromolecular crowding can affect the reactivity and structure of biomacromolecules, one could expect a possible charge regulation response triggered by a sufficiently high macromolecular concentration. Only recently, this hypothesis has been examined by theoretical [ 73 ] and experimental [ 277 , 278 ] studies which have studied the ionization of weak polyelectrolytes and peptides under MCr, respectively. Let us first review the theoretical insights on the charge regulation response triggered by MCr and later contrast those insights with the experimental observations.…”

Section: Weak Polyelectrolytes In Crowded Systemsmentioning

confidence: 99%

“…The recent potentiometric titration experiments performed by Yekymov et al [ 277 , 278 ] of poly(acrylic acid) (PAA) in presence of MCr suggest significant influence of MCr on the ionization of the PE. They studied the ionization of PAA in solution with two different crowder agents: short chains of poly(vinyl alcohol) (PVA) and Carbon Black nanoparticles with PVA grafted on their surface (CB-PVA).…”

Section: Weak Polyelectrolytes In Crowded Systemsmentioning

confidence: 99%

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Unusual Aspects of Charge Regulation in Flexible Weak Polyelectrolytes

et al. 2023

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This article reviews the state of the art of the studies on charge regulation (CR) effects in flexible weak polyelectrolytes (FWPE). The characteristic of FWPE is the strong coupling of ionization and conformational degrees of freedom. After introducing the necessary fundamental concepts, some unconventional aspects of the the physical chemistry of FWPE are discussed. These aspects are: (i) the extension of statistical mechanics techniques to include ionization equilibria and, in particular, the use of the recently proposed Site Binding-Rotational Isomeric State (SBRIS) model, which allows the calculation of ionization and conformational properties on the same foot; (ii) the recent progresses in the inclusion of proton equilibria in computer simulations; (iii) the possibility of mechanically induced CR in the stretching of FWPE; (iv) the non-trivial adsorption of FWPE on ionized surfaces with the same charge sign as the PE (the so-called “wrong side” of the isoelectric point); (v) the influence of macromolecular crowding on CR.

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Section: Weak Polyelectrolytes In Crowded Systemsmentioning

confidence: 99%

Section: Weak Polyelectrolytes In Crowded Systemsmentioning

confidence: 99%

Unusual Aspects of Charge Regulation in Flexible Weak Polyelectrolytes

et al. 2023

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Self-assembly of mixed surfactants sodium dodecylsulfate and polyethylene glycol dodecyl ether in aqueous solutions

Teixeira,

Quintão,

Oliveira

et al. 2024

Journal of Molecular Liquids

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Efficient Removal of Pharmaceutical Contaminants from Aqueous Solution Using Plant-Derived Biosurfactant-Assisted Dissolved Air Flotation Process

Pooja,

Senthil Kumar,

Boobalan

et al. 2024

Langmuir

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This study investigates the removal of ibuprofen and diclofenac from aqueous media via a fully pressurized dissolved air flotation system, enhanced by fenugreek-derived saponin, a plantbased biosurfactant. The use of fenugreek saponin in flotation processes distinguishes this work from previous studies as it offers an ecofriendly and efficient alternative to chemical surfactants. The biosurfactant's surface-active properties were confirmed through FT-IR, UV−vis spectroscopy identified key functional groups and structural characteristics of the saponin, NMR provided molecular insights into its bioactive components, and surface tension analyses demonstrated its ability to reduce interfacial tension, indicating effective surfactant behavior. To optimize the saponin extraction, the ultrasound-assisted extraction (UAE) method was employed using a 70% ethanolic solution for 50 min, significantly improving the flotation efficiency. Experimental conditions were carefully optimized to maximize the removal efficiency of both contaminants. For ibuprofen, the optimal pH was 5 with a retention time of 10 min, while for diclofenac, the optimal pH was 4 with a contact time of 15 min. A saponin dosage of 0.4 wt % was used in both cases, with the flotation process operating under a pressure of 15 psig and a flow rate of 0.5 L/min. Under these conditions, the process attained a maximum removal efficiency of 98.59% for ibuprofen and 95.32% for diclofenac. GC-MS results further validated the presence of bioactive components in fenugreek saponin that are responsible for its high contaminant removal capacity. Despite the challenge of scum removal during the flotation process, this study demonstrates the high efficiency of this process in treating low-concentration pollutants. The process is not only rapid but also allows for selective pollutant removal while minimizing the use of harmful chemicals, offering a more sustainable and ecofriendly solution for wastewater treatment.

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Effects of Non-Ionic Micelles on the Acid-Base Equilibria of a Weak Polyelectrolyte

Cited by 4 publications

References 64 publications

Unusual Aspects of Charge Regulation in Flexible Weak Polyelectrolytes

Unusual Aspects of Charge Regulation in Flexible Weak Polyelectrolytes

Self-assembly of mixed surfactants sodium dodecylsulfate and polyethylene glycol dodecyl ether in aqueous solutions

Efficient Removal of Pharmaceutical Contaminants from Aqueous Solution Using Plant-Derived Biosurfactant-Assisted Dissolved Air Flotation Process

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