1. Chemistry of surfactants

Pletnev, M. Yu.

doi:10.1016/s1383-7303(01)80062-4

Cited by 25 publications

(12 citation statements)

References 112 publications

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“…The lower specificity constant of PFOA (0.85 M -1 min -1 ) compared to PFOS (5.84 M -1 min -1 ) indicates that the cavity-water interface has a lower affinity for PFOA compared to PFOS. This property of PFAS is in agreement with the air-water interface theory of surfactant [36].…”

Section: Estimation Of Active Cavities Concentrationsupporting

confidence: 88%

“…If the concentration of the surfactant is above critical micelle concentration (CMC), the hydrophobic part of surfactant "hides" itself inside the micelle and hydrophilic part is oriented towards the aqueous environment [36]. Thus, the fluorinated hydrophobic tail of PFAS will be first to get exposed to an elevated temperature at the cavity-water interfacial region during cavity collapse.…”

Section: Resultsmentioning

confidence: 99%

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Kinetic model for sonolytic degradation of non-volatile surfactants: Perfluoroalkyl substances

Shende

Andaluri

Suri

2019

Ultrasonics Sonochemistry

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Sonolytic degradation kinetics of non-volatile surfactant perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) were investigated over a range of concentration, considering active cavity as a catalyst. The Michaelis-Menten type kinetic model was developed to empirically estimate the concentration of active cavity sites during reactions. Sonolytic degradation of PFOA and PFOS, as well as the formation of its inorganic constituents, fluoride, and sulfate, follows saturation kinetics of pseudo-first order at lower concentration (<2.34 µM) and zero order at higher concentration (>23.60 µM). Nitrate and hydrogen peroxide formations were 0.53 ± 0.14 µM/min and 0.95 ± 0.11 µM/min, respectively. At a power density of 77 W/L and frequency of 575 kHz, the empirically estimated maximum number of active cavity sites that could lead to the sonolytic reaction were 89.25 and 8.8 mM for PFOA and PFOS, respectively. This study suggests that a lower number of active cavity sites with higher temperature needed to degrade PFOS might be the reason for lower degradation rate of PFOS compared to that of PFOA. Diffusion of non-volatile surfactants at the cavity-water interface is found to be the rate-limiting step for the mineralization of perfluoroalkyl substances.

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Section: Estimation Of Active Cavities Concentrationsupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Kinetic model for sonolytic degradation of non-volatile surfactants: Perfluoroalkyl substances

Shende

Andaluri

Suri

2019

Ultrasonics Sonochemistry

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“…This is evidenced also from the constancy of σ ow in Tables and , at various surfactant concentrations. Such a behavior is typical for the surface/interfacial tension of surfactant solutions above the critical micelle concentration (cmc); see, e.g., ref . It is well-known that the kinetics of surfactant adsorption is very fast above the cmc.…”

Section: Comparison Of Theory and Experimentsmentioning

confidence: 92%

Detachment of Oil Drops from Solid Surfaces in Surfactant Solutions: Molecular Mechanisms at a Moving Contact Line

Kralchevsky

Danov

Kolev

et al. 2004

Ind. Eng. Chem. Res.

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Here, we present experimental data and a theoretical model for the dynamics of detachment of hexadecane drops from a solid substrate (glass plate) in aqueous solutions of anionic surfactant and salt, at various temperatures. The influence of the experimental conditions on the motion of the three-phase contact line is investigated. We found indications that water molecules can propagate by lateral diffusion in a thin layer on the surface of the solid plate. The driving force of the detachment process, viz., the imbalance of the interfacial tensions at the contact line, is engendered by the water penetration, while the line friction force compensates this imbalance and determines the stationary speed. Excellent agreement between theory and experiment is achieved. The present study specifies the parameters that can be used to quantitatively characterize the rate of drop detachment, determines the values of these parameters at various experimental conditions, and indicates tools for control of the investigated spontaneous process. † This paper is dedicated to Professor Darsh T. Wasan on the occasion of his 65th birthday.

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“…Surfactants are chemicals capable of reducing surface tension of liquids or interfaces of liquids, endowed by its hydrophobic tail and hydrophilic head (Rosen 1989 ;Fainerman et al 2001 ;Pletnev et al 2001 ;Salager 2002 ). Based on the charge of the hydrophilic group of surfactants, they are classifi ed as anionic (negatively charged), cationic (positively charged), non-ionic (without any charge) and ampholytic/zwitter ionic (both charges) (Myers and Wiley 1988 ) as shown in Table 5.1 .…”

Section: Chemistry Of Surfactantsmentioning

confidence: 99%

Pollutant Diseases, Remediation and Recycling

2013

Environmental Chemistry for a Sustainable World

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1. Chemistry of surfactants

Cited by 25 publications

References 112 publications

Kinetic model for sonolytic degradation of non-volatile surfactants: Perfluoroalkyl substances

Kinetic model for sonolytic degradation of non-volatile surfactants: Perfluoroalkyl substances

Detachment of Oil Drops from Solid Surfaces in Surfactant Solutions: Molecular Mechanisms at a Moving Contact Line

Pollutant Diseases, Remediation and Recycling

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