A Sustainable Method for Removal of the Full Range of Liquid and Solid Hydrocarbons from Water Including Up‐ and Recycling

Gaß, Henrik; Sarcletti, Marco; Müller, Lukas; Hübner, Sabine; Yokosawa, Tadahiro; Park, Hyoungwon; Przybilla, Thomas; Spiecker, Erdmann; Halik, Marcus

doi:10.1002/advs.202302495

Cited by 5 publications

(3 citation statements)

References 47 publications

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“…The mixed SAMs with x IMIPAC12 = 10–50% offer an appealing combination of hydrophobic surfaces in parallel to long-range electrostatics. This qualifies for tailoring the recognition of negatively charged nanoplastics − or other charged species with “fatty surfaces” while leaving simple hydrophobic segregation (e.g., association of oil) unchanged.…”

Section: Discussionmentioning

confidence: 99%

Tailoring the Wetting Behavior of Self-Assembled Monolayers by Surface Charge

Vivod,

Voß,

Halik

et al. 2024

J. Phys. Chem. C

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The wetting of (mixed) self-assembled monolayers (SAMs) is characterized as a function of surface charge. Using a combination of molecular dynamics simulations and contact angle measurements, we unravel the arrangement of dipoles and hydrogen bonds at the interface. Our basis simulation model features alkyl functionalization of an aluminum oxide surface via n-alkyl-phosphonic acid [C 18 H 37 −PO(OH) 2 ] molecules, which represents a commonly used hydrophobic SAM surface readily accessible to contact angle measurements. We then probed the effect of charging the alkyl-terminated SAMs to unravel the interplay of local hydrophobicity and the overall dipole arrangement within the droplets. Strikingly, we find that moderate positive charging retains the hydrophobic character and potentially makes the SAMs even more hydrophobic than their uncharged counterpart. We attribute this phenomenon to the hindering of dangling hydrogen atoms at the water-alkyl contact, as a consequence of dipole rearrangements. While our simulation models predict a contact angle increase by 10°as an upper estimate for boosting hydrophobicity, experimental analyses of mixed SAMs using imidazole/alkyl-terminated species showed roughly constant wetting behavior for moderately positive charging.

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Section: Discussionmentioning

confidence: 99%

Tailoring the Wetting Behavior of Self-Assembled Monolayers by Surface Charge

Vivod,

Voß,

Halik

et al. 2024

J. Phys. Chem. C

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“…The SPION concept is also applicable to commodity polyethylene (PE) MNPs. [34] Furthermore, we developed a semiempirical fit model to represent the general trend that emerged for all polymers tested. In the future, with a larger data set, this could be used to tailor the SPIONs to fit a specific MNP size range and further investigate the impact of material characteristics like polymer density and surface charge on the remediation process.…”

Section: Discussionmentioning

confidence: 99%

Magnetic Removal of Micro‐ and Nanoplastics from Water—from 100 nm to 100 µm Debris Size

Gaß,

Kloos,

Höfling

et al. 2023

Small

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Clean water is one of the most important resources of the planet but human‐made contamination with diverse pollutants increases continuously. Microplastics (<5 mm diameter) which can have severe impacts on the environment, are present worldwide. Degradation processes lead to nanoplastics (<1 µm), which are potentially even more dangerous due to their increased bioavailability. State‐of‐the‐art wastewater treatment plants show a deficit in effectively eliminating micro‐ and nanoplastics (MNP) from water, particularly in the case of nanoplastics. In this work, the magnetic removal of three different MNP types across three orders of magnitude in size (100 nm–100 µm) is investigated systematically. Superparamagnetic iron oxide nanoparticles (SPIONs) tend to attract oppositely charged MNPs and form aggregates that can be easily collected by a magnet. It shows that especially the smallest fractions (100–300 nm) can be separated in ordinary high numbers (1013 mg−1 SPION) while the highest mass is removed for MNP between 2.5 and 5 µm. The universal trend for all three types of MNP can be fitted with a derived model, which can make predictions for optimizing SPIONs for specific size ranges in the future.

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“…Furthermore, SPIONs exhibit lower toxicity and enhanced biocompatibility compared to other metallic nanoparticle counterparts, rendering them promising candidates for environmental remediation as well as for several bioapplications [21,22]. Importantly, magnetic remediation involving SPIONs is characterized by its reliability, and these nanoparticles can be effectively recycled for subsequent applications with consistently high efficiency, which decreases process costs [23].…”

Section: Introductionmentioning

confidence: 99%

SPIONs Magnetophoresis and Separation via Permanent Magnets: Biomedical and Environmental Applications

Wu,

Ciannella,

Choe

et al. 2023

Processes

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Superparamagnetic iron oxide nanoparticles (SPIONs) have emerged as cutting-edge materials, garnering increasing attention in recent years within the fields of chemical and biomedical engineering. This increasing interest is primarily attributed to the distinctive chemical and physical properties of SPIONs. Progress in nanotechnology and particle synthesis methodologies has facilitated the fabrication of SPIONs with precise control over parameters such as composition, size, shape, stability, and magnetic response. Notably, these functionalized materials exhibit a remarkable surface-area-to-volume ratio, biocompatibility, and, most importantly, they can be effectively manipulated using external magnetic fields. Due to these exceptional properties, SPIONs have found widespread utility in the medical field for targeted drug delivery and cell separation, as well as in the chemical engineering field, particularly in wastewater treatment. Magnetic separation techniques driven by magnetophoresis have proven to be highly efficient, encompassing both high-gradient magnetic separation (HGMS) and low-gradient magnetic separation (LGMS). This review aims to provide an in-depth exploration of magnetic field gradient separation techniques, alongside a comprehensive discussion of the applications of SPIONs in the context of drug delivery, cell separation, and environmental remediation.

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A Sustainable Method for Removal of the Full Range of Liquid and Solid Hydrocarbons from Water Including Up‐ and Recycling

Cited by 5 publications

References 47 publications

Tailoring the Wetting Behavior of Self-Assembled Monolayers by Surface Charge

Tailoring the Wetting Behavior of Self-Assembled Monolayers by Surface Charge

Magnetic Removal of Micro‐ and Nanoplastics from Water—from 100 nm to 100 µm Debris Size

SPIONs Magnetophoresis and Separation via Permanent Magnets: Biomedical and Environmental Applications

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