OHM Sponge: A Versatile, Efficient, and Ecofriendly Environmental Remediation Platform

Nandwana, Vikas; Ribet, Stephanie M.; Reis, Roberto dos; Kuang, Yuyao; More, Yash; Dravid, Vinayak P.

doi:10.1021/acs.iecr.0c01493

Cited by 24 publications

(13 citation statements)

References 54 publications

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“…The Architecture of the PEARL Membrane. Like its predecessor the OHM sponge (27,28), the platform membrane consists of two key components, a membrane and a nanoparticle coating, each of which can be tuned to the specific water remediation challenge. Cellulose was chosen as the platform for the PEARL membrane because of its hydrophilic character, large surface area to volume ratio, and hierarchical structure.…”

Section: Resultsmentioning

confidence: 99%

“…We demonstrated such an architecture with the Oleophilic, Hydrophobic, Magnetic (OHM) sponge, which is used for oil spill remediation (27,28). For this material, polyurethane was carefully chosen as the backbone due to its intrinsic hydrophobic properties.…”

Section: The Pearl Membranementioning

confidence: 99%

“…There are deliberate and designed similarities between the PEARL membrane and our previously reported material the OHM sponge (27). As a platform technology, we aim to develop a remediation approach that is multiplexed and anchored on key concepts of performance, scalability, reusability, and costeffectiveness.…”

Section: The Pearl Membranementioning

confidence: 99%

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Phosphate Elimination and Recovery Lightweight (PEARL) membrane: A sustainable environmental remediation approach

Ribet

Shindel

Reis

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Aqueous phosphate pollution can dramatically impact ecosystems, introducing a variety of environmental, economic, and public health problems. While novel remediation tactics based on nanoparticle binding have shown considerable promise in nutrient recovery from water, they are challenging to deploy at scale. To bridge the gap between the laboratory-scale nature of these nanostructure solutions and the practical benchmarks for deploying an environmental remediation tool, we have developed a nanocomposite material. Here, an economical, readily available, porous substrate is dip coated using scalable, water-based processes with a slurry of nanostructures. These nanomaterials have tailored affinity for specific adsorption of pollutants. Our Phosphate Elimination and Recovery Lightweight (PEARL) membrane can selectively sequester up to 99% of phosphate ions from polluted waters at environmentally relevant concentrations. Moreover, mild tuning of pH promotes at will adsorption and desorption of nutrients. This timed release allows for phosphate recovery and reuse of the PEARL membrane repeatedly for numerous cycles. We combine correlative microscopy and spectroscopy techniques to characterize the complex microstructure of the PEARL membrane and to unravel the mechanism of phosphate sorption. More broadly, through the example of phosphate pollution, this work describes a platform membrane approach based on nanostructures with specific affinity coated on a porous structure. Such a strategy can be tuned to address other environmental remediation challenges through the incorporation of other nanomaterials.

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Section: Resultsmentioning

confidence: 99%

Section: The Pearl Membranementioning

confidence: 99%

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Phosphate Elimination and Recovery Lightweight (PEARL) membrane: A sustainable environmental remediation approach

Ribet

Shindel

Reis

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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“…Lastly, the in situ combustion method can be processed quickly but has the disadvantage of generating oxides . To solve this problem, a reusable polyurethane (PU) sponge-based adsorbent with hydrophobic/oleophilic properties has been reported for oil–water separation. − This is because the PU sponge has the advantages of high elasticity, elastic recovery, and relatively light weight as an adsorbent and ultimately provides a large surface area due to its porous 3D structure. However, the surface of PU is composed of carboxyl and amino groups and is generally hydrophilic, so a modified form of the surface of the PU sponge is required.…”

Section: Introductionmentioning

confidence: 99%

Polyurethane Sponge with a Modified Specific Surface for Repeatable Oil–Water Separation

Kong

Han²,

Won

et al. 2021

ACS Omega

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Oil spill accidents contaminate the oceanic environment and cause economic distress, and they continue to occur. Many methods have been developed to restore waters contaminated with spilled oil. However, still most commercially available methods are not environmentally or economically sustainable solutions. Therefore, there is a need for the development of sustainable materials with running water treatment capabilities. In recent years, a polyurethane (PU) sponge-based adsorbent has been reported as an oil–water separation and reusable adsorbent. This is because the porous 3D structure of the PU sponge provides a large surface area. However, as the PU sponge has a carboxyl group and an amino group, it exhibits hydrophilicity, so surface modification is essential for oil–water separation. Therefore, to modify the surface of PU to have hydrophobic/oleophilic properties, a hydrophobic/oleophilic adsorbent (HOA) was prepared using graphite and polydimethylsiloxane. On the basis of this, a PU sponge, a porous material, was used to manufacture an adsorbent that can be used in a sustainable and environmentally friendly way. The prepared HOA can selectively adsorb water or oil and can be reused. Furthermore, continuous oil–water separation is possible through a simple flow of fluid. Therefore, it is confirmed that the studied HOA can have great potential for ocean restoration in the future as an adsorbent that mitigates the disadvantages of the currently commercialized method.

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“…

The Oleophilic Hydrophobic Magnetic (OHM) synthetic sponge is a novel nanocomposite system developed in the Dravid lab that offers the ability to repeatedly adsorb 20-35 times its weight in oil. [1,2] The OHM sponge is synthesized by coating a polyurethane sponge (soft) with a nanocomposite, made of mixed metal oxide nanoparticles, such as Fe3O4, and graphite (hard). We have demonstrated exceptional macroscale oleophilicity and hydrophobicity both in oil remediation tests and in isolated, controlled contact angle tests.

…”

mentioning

confidence: 99%

Multimodal Characterization of the Oleophilic Hydrophobic Magnetic (OHM) Sponge: A Nanocomposite Material for Oil Spill Remediation

et al. 2020

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OHM Sponge: A Versatile, Efficient, and Ecofriendly Environmental Remediation Platform

Cited by 24 publications

References 54 publications

Phosphate Elimination and Recovery Lightweight (PEARL) membrane: A sustainable environmental remediation approach

Phosphate Elimination and Recovery Lightweight (PEARL) membrane: A sustainable environmental remediation approach

Polyurethane Sponge with a Modified Specific Surface for Repeatable Oil–Water Separation

Multimodal Characterization of the Oleophilic Hydrophobic Magnetic (OHM) Sponge: A Nanocomposite Material for Oil Spill Remediation

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