Water Treatment Method for Removal of Select Heavy Metals and Nutrient Ions Through Adsorption by Magnetite

Leitzke, Teagan; Downey, Jerome P.; LaDouceur, Richard; Margrave, Daisy M.; Wallace, Grant C.; Hutchins, David L.

doi:10.1021/acsestwater.2c00242

Cited by 10 publications

(4 citation statements)

References 33 publications

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“…As detailed in the Materials and Methods, we synthesized several of the most promising metal oxide nanoparticles, ,, diluted them into slurries, and coated them onto sponges, quantifying the nanoparticle loading on the sponge and generating independent adsorption isotherms from each adsorbent composition. Lead was selected for comprehensive adsorptive property testing, due to the heightened awareness of it as a toxic heavy metal in the American Midwest and the large volume of existing literature on lead adsorption making it a well-studied and relevant model analyte for comparison to other research.…”

Section: Resultsmentioning

confidence: 99%

Nano-SCHeMe: Nanomaterial Sponge Coatings for Heavy Metals, an Environmental Remediation Platform

et al. 2023

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The presence of heavy metals in our water supply poses an immense global public health burden. Heavy metal consumption is tied to increased mortality and a wide range of insidious health outcomes. In recent years, great strides have been made toward nanotechnological approaches for environmental problems, specifically the design of adsorbents to detoxify water, as well as for a related challenge of recovering valuable metals at low concentrations. However, applying nanomaterials at scale and differentiating which nanomaterials are best suited for particular applications can be challenging.Here, we report a methodology for loading nanomaterial coatings onto adsorbent membranes, testing different coatings against one another, and leveraging these materials under a variety of conditions. Our tailored coating for lead remediation, made from manganese-doped goethite nanoparticles, can filter lead from contaminated water to below detectable levels when coated onto a cellulose membrane, and the coated membrane can be recovered and reused for multiple cycles through mild tuning of pH. The Nano-SCHeMe methodology demonstrates a platform approach for effectively deploying nanomaterials for environmental applications and for direct and fair comparisons among these nanomaterials. Moreover, this approach is flexible and expansive in that our coatings have the potential to be applied to a range of sorbents.

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Section: Resultsmentioning

confidence: 99%

Nano-SCHeMe: Nanomaterial Sponge Coatings for Heavy Metals, an Environmental Remediation Platform

et al. 2023

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“…The NO 3 − anion is however not expected to have a significant influence on the magnetite properties because it has been shown before that the binding of metals with nitrate is minor or negligible 55 and the adsorption of nitrate to magnetite is minor. 56,57 We therefore propose that any influence of NO 3 − on the adsorption of metal cations was systematic and not significant.…”

Section: Safety Statementmentioning

confidence: 90%

Cu(II) and Cd(II) Removal Efficiency of Microbially Redox-Activated Magnetite Nanoparticles

Bayer,

Wei,

Kappler

et al. 2023

ACS Earth Space Chem.

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Heavy metal pollutants in the environment are of global concern due to their risk of contaminating drinking water and food supplies. Removal of these metals can be achieved by adsorption to mixed-valent magnetite nanoparticles (MNPs) due to their high surface area, reactivity, and ability for magnetic recovery. The adsorption capacity and overall efficiency of MNPs are influenced by redox state as well as surface charge, the latter of which is directly related to solution pH. However, the influence of microbial redox cycling of iron (Fe) in magnetite alongside the change of pH on the metal adsorption process by MNPs remains an open question. Here we investigated adsorption of Cd 2+ and Cu 2+ by MNPs at different pH values that were modified by microbial Fe(II) oxidation or Fe(III) reduction. We found that the maximum adsorption capacity increased with pH for Cd 2+ from 256 μmol/g Fe at pH 5.0 to 478 μmol/g Fe at pH 7.3 and for Cu 2+ from 229 μmol/g Fe at pH 5.0 to 274 μmol/g Fe at pH 5.5. Microbially reduced MNPs exhibited the greatest adsorption for both Cu 2+ and Cd 2+ (632 μmol/g Fe at pH 7.3 for Cd 2+ and 530 μmol/g Fe at pH 5.5 for Cu 2+ ). Magnetite oxidation also enhanced adsorption of Cu 2+ but inhibited Cd 2+ . Our results show that microbial modification of MNPs has an important impact on the (im-)mobilization of aqueous contaminations like Cu 2+ and Cd 2+ and that a change in stoichiometry of the MNPs can have a greater influence than a change of pH.

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“…Different technologies, such as precipitation–coagulation–flocculation (Figure a), adsorption (Figure b), ion exchange (Figure c), flotation (Figure d), and membrane-based separation have been developed for ion removal from wastewater. − Precipitation combined with coagulation, flocculation, and flotation has been widely applied for the removal of ions from wastewater due to their low cost. However, several major problems, such as the large volumes of generated sludge and the additional of extra chemicals limit their further application .…”

Section: Introductionmentioning

confidence: 99%

Progress of Ultrafiltration-Based Technology in Ion Removal and Recovery: Enhanced Membranes and Integrated Processes

et al. 2023

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Toxic ions from industrial wastewater entail important challenges to the environment. Ultrafiltration (UF) with low operation pressure and high permeability has been widely used for macromolecules and suspended solids separation. However, UF cannot be directly used to separate ions from wastewater due to the large pore size of UF membranes. Recently, the design of enhanced UF membrane structures and UF-based integrated processes expands the application of UF for ion removal. This review aims to summarize the latest developments of UF membranes preparation as well as integrated UF processes in ion removal. First, the advanced materials for UF membranes preparation are discussed, with specific attention on active nanomaterials including inorganic materials, organic materials, and biomaterial-based materials. The design principles such as pore size control and composite thin layer fabrication of enhanced UF-based membranes for ion removal are illustrated. Next, integrated processes such as micellar-enhanced UF, polymer-enhanced UF, electro-driven UF, and other UF-based combined processes are reviewed. Finally, current application limitations and future perspectives in the enhanced UF membrane for ion removal are discussed. This review presents potential approaches for the preparation and application of enhanced UF membranes in sustainable ion removal from wastewaters.

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Water Treatment Method for Removal of Select Heavy Metals and Nutrient Ions Through Adsorption by Magnetite

Cited by 10 publications

References 33 publications

Nano-SCHeMe: Nanomaterial Sponge Coatings for Heavy Metals, an Environmental Remediation Platform

Nano-SCHeMe: Nanomaterial Sponge Coatings for Heavy Metals, an Environmental Remediation Platform

Cu(II) and Cd(II) Removal Efficiency of Microbially Redox-Activated Magnetite Nanoparticles

Progress of Ultrafiltration-Based Technology in Ion Removal and Recovery: Enhanced Membranes and Integrated Processes

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