Isothermal titration microcalorimetry to determine the thermodynamics of metal ion removal by magnetic nanoparticle sorbents

Huang, Yuxiong; Keller, Arturo A.

doi:10.1039/c6en00227g

Cited by 15 publications

(13 citation statements)

References 63 publications

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“…Ligand DNPs exhibited higher removal efficiencies of Pb 2+ from both farmland and grassland soils compared to Cd 2+ , which agrees with the sequence of their EDTA complex formation constants (log K, 25˚C): 18.04 for Pb 2+ and 16.46 for Cd 2+ [49]. It suggests that the complexation between Pb 2+ or Cd 2+ and the EDTA-functionalized surface is the dominant removal mechanism [31].…”

Section: Plos Onesupporting

confidence: 69%

“…Similar to our previous synthesis strategies [29,31], the core-shell Ligand DNPs were prepared in two steps. The WO 3 nanoparticles were coated with APTES to form a silane polymer layer via hydrolysis reaction [38].…”

Section: Synthesis Of Ligand Dnpsmentioning

confidence: 99%

“…Similar removal performance was observed when applying Ligand DNPs for Cd 2+ soil remediation, as over 70% of the maximum removal efficiency could be achieved in the first 6 hours for both soils (Fig 3B). However, it took up to 3 days of mixing to achieve Cd 2+ sorption equilibrium (Fig 3B), suggesting Ligand DNPs exhibit a faster removal rate for Pb 2+ than Cd 2+ , which is due to the stronger binding constant with EDTA [31].…”

Section: Plos Onementioning

confidence: 99%

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Remediation of heavy metal contamination of sediments and soils using ligand-coated dense nanoparticles

Huang

Keller

2020

PLoS ONE

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Sediment and soil contamination with toxic heavy metals, including cadmium (Cd 2+) and lead (Pb 2+), represents a major long-term remediation challenge. Resuspension of contaminated sediments into the water column, or the uptake of toxic metals from top soil, can lead to exposure of aquatic or terrestrial organisms, followed by bioconcentration, bioaccumulation and biomagnification, which may pose a threat to public health. We have developed a novel nanoscale engineered material, namely ligand-coated dense nanoparticles (Ligand DNPs), which contain a dense WO 3 nanoparticle core and a shell functionalized with a metal-binding organic ligand (EDTA), to effectively sequester heavy metal ions deeper into the soil and sediments. We demonstrate that one application of Ligand DNPs can remove from 60% to almost 80% of the Cd and Pb in two different soil matrices, driving these metal ions deeper into the sediment or soil column via gravity, and making them less bioavailable. Ligand DNPs can provide a relatively fast, convenient, and efficient in-situ approach for the remediation of sediments and soils contaminated with heavy metals.

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Section: Plos Onesupporting

confidence: 69%

Section: Synthesis Of Ligand Dnpsmentioning

confidence: 99%

Section: Plos Onementioning

confidence: 99%

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Remediation of heavy metal contamination of sediments and soils using ligand-coated dense nanoparticles

Huang

Keller

2020

PLoS ONE

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“…The test procedure followed that used in previous studies of metal ions and methylene blue adsorption on carbon materials. [41][42][43] The ITC data were automatically analysed using the Microcal Origin 7.0 software. All the data were blank corrected for the heat of dilution of target contaminant and water, and the heat of carbon and water interactions.…”

Section: Heat Of Adsorption Using a Calorimetric Titration Methodsmentioning

confidence: 99%

Chemical regeneration of granular activated carbon: preliminary evaluation of alternative regenerant solutions

Larasati

Fowler

Graham

2020

Environ. Sci.: Water Res. Technol.

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“…Calorimetry is a powerful tool which allows to directly measure the energy exchange occurring when two reagents are mixed in the measurement cell. This technique has been largely used to obtain thermodynamic data for metal complexation reactions occurring in aqueous or non-aqueous media [20][21][22][23][24][25][26][27][28][29], but much less examples of ITC applied to metal ion adsorption studies are present in the literature [30][31][32][33][34][35][36][37]. In many works, metal ion adsorption enthalpy (ΔHads) has been calculated by van't Hoff equation [38,39].…”

Section: In This Work Spion Functionalized With 3-mercaptopropionic mentioning

confidence: 99%

Thermodynamics of Hg2+ and Ag+ adsorption by 3-mercaptopropionic acid-functionalized superparamagnetic iron oxide nanoparticles

Lanas

Valiente

Tolazzi

et al. 2018

J Therm Anal Calorim

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Superparamagnetic iron nanoparticles (SPION) have been functionalized with 3mercaptopropionic acid (3-MPA), characterized and applied for the removal of Ag + , Hg 2+ and Pb 2+ metal ions from aqueous solutions by iron oxide (Fe3O4). The heavy metal adsorption has been investigated by means of ICP-OES and isothermal titration calorimetry. Experimental data ware better fitted by Langmuir rather than Freundlich isotherms and the thermodynamic parameters for the adsorption process of the metal ions on the functionalized SPION nanoparticles (SPION@3-MPA) were obtained. Isothermal titration calorimetry (ITC) is applied to monitor heavy metal adsorption on SPION@3-MPA: the process results to be exothermic for Hg 2+ , Ag + while it is weakly endothermic in the case of Pb 2+ and the adsorption enthalpies and entropies have been obtained. The values of the thermodynamic parameters suggest that the Ag + and Hg 2+ ions interact strongly with the thiol groups, while the Pb 2+ ions seem to be adsorbed by the material mostly via electrostatic interaction. When compared to other thiol-functionalized materials, the obtained SPION@3-MPA NP can be considered a competitive adsorbent for Ag + and Hg 2+ ions. The comparison between the ICP-OES adsorption rata and the enthalpy trend obtained by ITC supports shows that the latter technique can be a good tool for a fast testing of materials to be applied for heavy metal separation from solutions.

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Isothermal titration microcalorimetry to determine the thermodynamics of metal ion removal by magnetic nanoparticle sorbents

Abstract: Applying ITC to determine key thermodynamic parameters needed to model the sorption of metal ions by magnetic nanoparticles sorbents.

Cited by 15 publications

References 63 publications

Remediation of heavy metal contamination of sediments and soils using ligand-coated dense nanoparticles

Remediation of heavy metal contamination of sediments and soils using ligand-coated dense nanoparticles

Chemical regeneration of granular activated carbon: preliminary evaluation of alternative regenerant solutions

Thermodynamics of Hg2+ and Ag+ adsorption by 3-mercaptopropionic acid-functionalized superparamagnetic iron oxide nanoparticles

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