Nanoporous Block Polymer Thin Films Functionalized with Bio-Inspired Ligands for the Efficient Capture of Heavy Metal Ions from Water

Weidman, Jacob L.; Mulvenna, Ryan A.; Boudouris, Bryan W.; Phillip, William A.

doi:10.1021/acsami.7b04603

Cited by 53 publications

(37 citation statements)

References 39 publications

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“…5 and fig. S8), making this system a starting platform for other applications, such as adsorption and removal of heavy metals ( 35 , 36 ), which require hydrophilic materials or further functionalization. Because of the presence of carboxylic groups and the unique morphology, a targeted application could be to use the now converted PS- b -PAA isotropic film as a scaffold to grow porous inorganic materials ( 37 ).…”

Section: Resultsmentioning

confidence: 99%

Artificial 3D hierarchical and isotropic porous polymeric materials

et al. 2018

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Section: Resultsmentioning

confidence: 99%

Artificial 3D hierarchical and isotropic porous polymeric materials

et al. 2018

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“…For example, a previous study demonstrated the coupling of the small molecule, cysteamine, as well as the peptide, glutathione, to the pore wall. 125 Both chemistries were able to remove more than 98% of the lead ions in a 50 ppm feed solution via selective binding between the metal ions and the thiol groups of the two ligands. Similar chemical flexibility can be realized in many precursor systems.…”

Section: Modifying the Pore Wall Chemistry For Advanced Solute Separamentioning

confidence: 99%

Fit-for-purpose block polymer membranes molecularly engineered for water treatment

et al. 2018

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Continued stresses on fresh water supplies necessitate the utilization of non-traditional resources to meet the growing global water demand. Desalination and hybrid membrane processes are capable of treating non-traditional water sources to the levels demanded by users. Specifically, desalination can produce potable water from seawater, and hybrid processes have the potential to recover valuable resources from wastewater while producing water of a sufficient quality for target applications. Despite the demonstrated successes of these processes, state-of-the-art membranes suffer from limitations that hinder the widespread adoption of these water treatment technologies. In this review, we discuss nanoporous membranes derived from self-assembled block polymer precursors for the purposes of water treatment. Due to their well-defined nanostructures, myriad chemical functionalities, and the ability to molecularly-engineer these properties rationally, block polymer membranes have the potential to advance water treatment technologies. We focus on block polymer-based efforts to: (1) nanomanufacture large areas of highperformance membranes; (2) reduce the characteristic pore size and push membranes into the reverse osmosis regime; and (3) design and implement multifunctional pore wall chemistries that enable solute-specific separations based on steric, electrostatic, and chemical affinity interactions. The use of molecular dynamics simulations to guide block polymer membrane design is also discussed because its ability to systematically examine the available design space is critical for rapidly translating fundamental understanding to water treatment applications. Thus, we offer a full review regarding the computational and experimental approaches taken in this arena to date while also providing insights into the future outlook of this emerging technology.

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“…Adsorptive nanoporous membranes are an emerging class of nanomaterials whose promise arises from their multifunctional nanostructure, which is controlled during synthesis to target specific contaminants such as lead. 28 Once depleted, these membranes can be reused after regeneration using external stimuli such as pH swings. 28,29 Their ability to selectively extract contaminants from water and their reusability makes adsorptive nanoporous membranes an attractive option for integration into FFP water treatment systems.…”

Section: Introductionmentioning

confidence: 99%

Material Property Targets for Emerging Nanomaterials to Enable Point-of-Use and Point-of-Entry Water Treatment Systems

Eugene¹,

Phillip²,

Dowling

2020

Preprint

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The scarcity of potable water is an imminent threat to at least half the world's population. Engineered nanomaterials (ENMs) have the potential to treat water from polluted sources to mitigate the scarcity of potable water. However, the performance demands on these materials in practical applications has not been studied in detail. This is but one of the challenges that hinder the widespread implementation of ENMs for water treatment. The emerging fit-for-purpose paradigm which encourages water treatment at the point-of-use (POU) or point-of-entry (POE) could lower the barrier for the use of ENMs in water technology by incorporating smaller, decentralized ENM-based treatment systems. This work develops a bottom-up and top-down modeling framework to facilitate the design of nanoporous membrane-based sorbents, a promising class of ENMs, for POU and POE water treatment applications. Langmuir isotherm and membrane structure-property calculations provide the multiscale link between molecular properties, including affinity, saturation capacity, and pore size, device design decisions, including membrane area and thickness, and system design decisions, including sorbent mass and number of parallel modules. The framework predicts that for lead contaminants, existing materials are near molecular and systems limitations; improvements in the properties of adsorptive materials to treat lead will yield few benefits for POU and POE treatment systems. Moreover, the framework provides dimensionless formulas that apply to all adsorptive systems that exhibit (near) equilibrium behavior as an easy-to-use tool for the broader membrane science and environmental engineering communities to assess the feasibility of emerging materials to meet process demands. A case study regarding materials for arsenic removal demonstrates how to apply the modeling framework to calculate material properties targets and predict system performance for an arbitrary single-solute adsorption process. Finally, these dimensionless models are used to identify three distinct regions of relative performance between batch and semi-continuous processes. These results give caution to applying scale-up heuristics outside their valid region, which can lead to under- or over-design during bottom-up studies. The presented modeling framework is a crucial step to fully optimize engineered nanomaterials across material, device, and system scales.

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Nanoporous Block Polymer Thin Films Functionalized with Bio-Inspired Ligands for the Efficient Capture of Heavy Metal Ions from Water

Cited by 53 publications

References 39 publications

Artificial 3D hierarchical and isotropic porous polymeric materials

Artificial 3D hierarchical and isotropic porous polymeric materials

Fit-for-purpose block polymer membranes molecularly engineered for water treatment

Material Property Targets for Emerging Nanomaterials to Enable Point-of-Use and Point-of-Entry Water Treatment Systems

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