The power of power: Electrokinetic control of PAH interactions with exfoliated graphite

Qin, Jinyi; Moustafa, Ahmed; Harms, Hauke; El-Din, Mohamed Gamal; Wick, Lukas Y.

doi:10.1016/j.jhazmat.2015.02.008

Cited by 10 publications

(7 citation statements)

References 33 publications

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“…The heating color map hence supports the prediction of DC-temperature enhancement of charged chemical sorption under various T and X . Our model thus may give rise to future environmental applications, ,, to kinetically enhance the sorption of contaminants in response to fluctuating sorbate concentrations in contaminated water streams at PFOA point sources.…”

Section: Discussionmentioning

confidence: 99%

“…Our synergistic approach of electrokinetic and temperature may be used to kinetically enhance the sorption of contaminants on activated carbon in environmental applications. ,, This may give rise to future technical applications, for instance, in response to fluctuating sorbate concentrations in contaminated water streams or to avoid unwanted sorption solutes in technical applications.…”

Section: Relevance For Environmental Applicationsmentioning

confidence: 99%

“…14,39 EOF may perform best in thin pore networks, where the hydraulic flow has limited access, 40−42 and additional electrokinetic chemical dispersion efficiently influences chemical−sorbent interactions, as, e.g., has been shown for the sorption kinetics of phenanthrene on mineral and carbonaceous sorbents. 15,32,41 The mechanisms of joint electrokinetic and temperature effects on chemical sorption and its rate-limiting factors, respectively, remain unexplored. It can be assumed that EM and EOF efficiently promote chemical dispersion in both intraparticle pore networks (i.e., promote pore diffusion) and the thin film around the sorbent outer surface (i.e., promote film diffusion).…”

Section: Introductionmentioning

confidence: 99%

“…EM consists of the directed transport of charged chemicals in electrolytes by electrostatic forces. , It efficiently controls the transport of charged species in porous media , such as perfluorooctanoic acid (PFOA), which ionizes at neutral liquid pH (p K a = −0.5) . EOF enables the transport of uncharged and charged chemicals by a plug-shaped liquid flow in sorbent pore networks that is driven by the movement of cations adhering to the sorbent surfaces at the electrical double layer. , EOF may perform best in thin pore networks, where the hydraulic flow has limited access, − and additional electrokinetic chemical dispersion efficiently influences chemical–sorbent interactions, as, e.g., has been shown for the sorption kinetics of phenanthrene on mineral and carbonaceous sorbents. ,, …”

Section: Introductionmentioning

confidence: 99%

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Effects of Temperature and DC Electric Fields on Perfluorooctanoic Acid Sorption Kinetics to Activated Carbon

Shan,

Hao,

Yin

et al. 2024

Environ. Sci. Technol.

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Sorption to activated carbon is a common approach to reducing environmental risks of waterborne perfluorooctanoic acid (PFOA), while effective and flexible approaches to PFOA sorption are needed. Variations in temperature or the use of electrokinetic phenomena (electroosmosis and electromigration) in the presence of external DC electric fields have been shown to alter the contaminant sorption of contaminants. Their role in PFOA sorption, however, remains unclear. Here, we investigated the joint effects of DC electric fields and the temperature on the sorption of PFOA on activated carbon. Temperature-dependent batch and column sorption experiments were performed in the presence and absence of DC fields, and the results were evaluated by using different kinetic sorption models. We found an emerging interplay of DC and temperature on PFOA sorption, which was linked via the liquid viscosity (η) of the electrolyte. For instance, the combined presence of a DC field and low temperature increased the PFOA loading up to 38% in 48 h relative to DC-free controls. We further developed a model that allowed us to predict temperature-and DC field strength-dependent electrokinetic benefits on the drivers of PFOA sorption kinetics (i.e., intraparticle diffusivity and the film mass transfer coefficient). Our insights may give rise to future DC-and temperature-driven applications for PFOA sorption, for instance, in response to fluctuating PFOA concentrations in contaminated water streams.

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Section: Discussionmentioning

confidence: 99%

Section: Relevance For Environmental Applicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Temperature and DC Electric Fields on Perfluorooctanoic Acid Sorption Kinetics to Activated Carbon

Shan,

Hao,

Yin

et al. 2024

Environ. Sci. Technol.

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“…It can be used to predict electrokinetic effects on bacterial deposition in environmental and biotechnological applications (e.g., elimination of unwanted bacteria in drinking water or the prevention of biofilm induced corrosion). Knowledge on DC-effects also allows to manage electrokinetic bacterial dispersal in subsurface porous media and, for example, to change microbial community structures and functions and to promote contaminant biodegradation in disturbed ecosystems. , Electrokinetic effects may also improve the transport of nutrients by electromigration or change the interactions of contaminants with sorbents, , thereby enhancing the biodegradation of contaminants during engineered clean-up of contaminated soil or waters.…”

Section: Discussionmentioning

confidence: 99%

Effects of Electrokinetic Phenomena on Bacterial Deposition Monitored by Quartz Crystal Microbalance with Dissipation Monitoring

Shan

Liu

et al. 2020

Environ. Sci. Technol.

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Bacterial deposition is the first step in the formation of microbial biofilms in environmental technology, and there is high interest in controlling such deposition. Earlier work indicated that direct current (DC) electric fields could influence bacterial deposition in percolation columns. Here, a time-resolved quartz crystal microbalance with dissipation monitoring (QCM-D) and microscopy-based cell counting were used to quantify DC field effects on the deposition of bacterial strains Pseudomonas putida KT2440 and Pseudomonas fluorescens LP6a at varying electrolyte concentrations and weak electric field strengths (0–2 V cm–1). DC-induced frequency shifts (Δf), dissipation energy (ΔD), and ratios thereof (Δf/ΔD) proved as good indicators of the rigidity of cell attachment. We interpreted QCM-D signals using a theoretical approach by calculating the attractive DLVO-force and the shear and drag forces acting on a bacterium near collector surfaces in a DC electric field. We found that changes in DC-induced deposition of bacteria depended on the relative strengths of electrophoretic drag and electro-osmotic shear forces. This could enable the prediction and electrokinetic control of microbial deposition on surfaces in natural and manmade ecosystems.

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Electrokinetic effects on the interaction of phenanthrene with geo-sorbents

et al. 2020

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The power of power: Electrokinetic control of PAH interactions with exfoliated graphite

Cited by 10 publications

References 33 publications

Effects of Temperature and DC Electric Fields on Perfluorooctanoic Acid Sorption Kinetics to Activated Carbon

Effects of Temperature and DC Electric Fields on Perfluorooctanoic Acid Sorption Kinetics to Activated Carbon

Effects of Electrokinetic Phenomena on Bacterial Deposition Monitored by Quartz Crystal Microbalance with Dissipation Monitoring

Electrokinetic effects on the interaction of phenanthrene with geo-sorbents

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