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Rotureau E, Pinheiro JP, Duval JF. On the evaluation of the intrinsic stability of indium-nanoparticulate organic matter complexes. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128859] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Wang Q, Zheng C, Zhang J, He F, Yao Y, Zhang TC, He C. Insights into the adsorption of Pb(II) over trimercapto-s-triazine trisodium salt-modified lignin in a wide pH range. CHEMICAL ENGINEERING JOURNAL ADVANCES 2020. [DOI: 10.1016/j.ceja.2020.100002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Water dispersible supramolecular assemblies built from luminescent hexarhenium clusters and silver(I) complex with pyridine-2-ylphospholane for sensorics. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112853] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Stripping chronopotentiometry at scanned deposition potential (SSCP): An effective methodology for dynamic speciation analysis of nanoparticulate metal complexes. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.113530] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Town RM, van Leeuwen HP, Duval JFL. Rigorous Physicochemical Framework for Metal Ion Binding by Aqueous Nanoparticulate Humic Substances: Implications for Speciation Modeling by the NICA-Donnan and WHAM Codes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:8516-8532. [PMID: 31291104 DOI: 10.1021/acs.est.9b00624] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Latest knowledge on the reactivity of charged nanoparticulate complexants toward aqueous metal ions is discussed in mechanistic detail. We present a rigorous generic description of electrostatic and chemical contributions to metal ion binding by nanoparticulate complexants, and their dependence on particle size, particle type (i.e., reactive sites distributed within the particle body or confined to the surface), ionic strength of the aqueous medium, and the nature of the metal ion. For the example case of soft environmental particles such as fulvic and humic acids, practical strategies are delineated for determining intraparticulate metal ion speciation, and for evaluating intrinsic chemical binding affinities and heterogeneity. The results are compared with those obtained by popular codes for equilibrium speciation modeling (namely NICA-Donnan and WHAM). Physicochemical analysis of the discrepancies generated by these codes reveals the a priori hypotheses adopted therein and the inappropriateness of some of their key parameters. The significance of the characteristic time scales governing the formation and dissociation rates of metal-nanoparticle complexes in defining the relaxation properties and the complete equilibration of the metal-nanoparticulate complex dispersion is described. The dynamic features of nanoparticulate complexes are also discussed in the context of predictions of the labilities and bioavailabilities of the metal species.
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Affiliation(s)
- Raewyn M Town
- Systemic Physiological and Ecotoxicological Research (SPHERE), Department of Biology , University of Antwerp , Groenenborgerlaan 171 , 2020 Antwerp , Belgium
- Physical Chemistry and Soft Matter , Wageningen University & Research , Stippeneng 4 , 6708 WE Wageningen , The Netherlands
| | - Herman P van Leeuwen
- Physical Chemistry and Soft Matter , Wageningen University & Research , Stippeneng 4 , 6708 WE Wageningen , The Netherlands
| | - Jérôme F L Duval
- CNRS - Université de Lorraine , Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), UMR 7360 CNRS , 15 avenue du Charmois , 54500 Vandoeuvre-les-Nancy , France
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Town RM, van Leeuwen HP, Blust R. Biochemodynamic Features of Metal Ions Bound by Micro- and Nano-Plastics in Aquatic Media. Front Chem 2018; 6:627. [PMID: 30631763 PMCID: PMC6315154 DOI: 10.3389/fchem.2018.00627] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 12/03/2018] [Indexed: 12/15/2022] Open
Abstract
A simple model, based on spherical geometry, is applied to the description of release kinetics of metal species from nano- and micro-plastic particles. Compiled literature data show that the effective diffusion coefficients, D eff, for metal species within plastic polymer bodies are many orders of magnitude lower than those applicable for metal ions in bulk aqueous media. Consequently, diffusion of metal ions in the aqueous medium is much faster than that within the body of the plastic particle. So long as the rate of dissociation of any inner-sphere metal complexes is greater than the rate of diffusion within the particle body, the latter process is the limiting step in the overall release kinetics of metal species that are sorbed within the body of the plastic particle. Metal ions that are sorbed at the very particle/medium interface and/or associated with surface-sorbed ligands do not need to traverse the particle body and thus in the diffusion-limiting case, their rate of release will correspond to the rate of diffusion in the aqueous medium. Irrespective of the intraparticulate metal speciation, for a given diffusion coefficient, the proportion of metal species released from plastic particles within a given time frame increases dramatically as the size of the particle decreases. The ensuing consequences for the chemodynamics and bioavailability of metal species associated with plastic micro- and nano-particles in aquatic systems are discussed and illustrated with practical examples.
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Affiliation(s)
- Raewyn M Town
- Systemic Physiological and Ecotoxicological Research (SPHERE), Department of Biology, University of Antwerp, Antwerp, Belgium.,Physical Chemistry and Soft Matter, Wageningen University & Research, Wageningen, Netherlands
| | - Herman P van Leeuwen
- Physical Chemistry and Soft Matter, Wageningen University & Research, Wageningen, Netherlands
| | - Ronny Blust
- Systemic Physiological and Ecotoxicological Research (SPHERE), Department of Biology, University of Antwerp, Antwerp, Belgium
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Town RM, Duval JFL, van Leeuwen HP. The Intrinsic Stability of Metal Ion Complexes with Nanoparticulate Fulvic Acids. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:11682-11690. [PMID: 30226375 DOI: 10.1021/acs.est.8b02896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The electrostatic contributions to metal ion binding by fulvic acids (FAs) are characterized in light of recent theoretical developments on description of the net charge density of soft nanoparticles. Under practical electrolyte concentrations, the radius of the small, highly charged soft nanoparticulate FAs is comparable to the electrostatic screening length and their electric potential profile has a bell shape that extends into the surrounding aqueous medium. Consequently, accumulation of counterions in the extraparticulate zone can be significant. By comparison of experimentally derived Boltzmann partitioning coefficients with those computed on the basis of (i) the structural FA particle charge and (ii) the potential profile for a nanoparticulate FA entity equilibrated with indifferent electrolyte, we identify the thickness of the extraparticulate counter charge accumulation shell in 1-1 and 2-1 electrolytes. The results point to the involvement of counterion condensation phenomena and call into question the approaches for modeling electrostatic contributions to ion binding that are invoked by popular equilibrium speciation codes. Overall, the electrostatic contributions to Cdaq2+ and Cuaq2+ association with FA are weaker than those previously found for much larger humic acids (HA). The intrinsic chemical binding strength of CdFA is comparable to that of CdHA, whereas CuFA complexes are weaker than CuHA ones.
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Affiliation(s)
- Raewyn M Town
- Systemic Physiological and Ecotoxicological Research (SPHERE), Department of Biology , University of Antwerp , Groenenborgerlaan 171 , 2020 Antwerp , Belgium
- Physical Chemistry and Soft Matter , Wageningen University & Research , Stippeneng 4 , 6708 WE Wageningen , The Netherlands
| | - Jérôme F L Duval
- CNRS , Laboratoire Interdisciplinaire des Environnements Continenteaux (LIEC) , UMR 7360, Vandoeuvre-lès-Nancy , F-54501 Nancy , France
- Université de Lorraine , LIEC, UMR 7360, Vandoeuvre-lès-Nancy , F-54501 Nancy , France
| | - Herman P van Leeuwen
- Physical Chemistry and Soft Matter , Wageningen University & Research , Stippeneng 4 , 6708 WE Wageningen , The Netherlands
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Town RM, Pinheiro JP, van Leeuwen HP. Chemodynamics of Soft Nanoparticulate Metal Complexes: From the Local Particle/Medium Interface to a Macroscopic Sensor Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:527-536. [PMID: 27989214 DOI: 10.1021/acs.langmuir.6b03381] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The lability of a complex species between a metal ion M and a binding site S, MS, is conventionally defined with respect to an ongoing process at a reactive interface, for example, the conversion or accumulation of the free metal ion M by a sensor. In the case of soft charged multisite nanoparticulate complexes, the chemodynamic features that are operative within the micro environment of the particle body generally differ substantially from those for dissolved similar single-site complexes in the same medium. Here we develop a conceptual framework for the chemodynamics and the ensuing lability of soft (3D) nanoparticulate metal complexes. The approach considers the dynamic features of MS at the intraparticulate level and their impact on the overall reactivity of free metal ions at the surface of a macroscopic sensing interface. Chemodynamics at the intraparticulate level is shown to involve a local reaction layer at the particle/medium interface, while at the macroscopic sensor level an operational reaction layer is invoked. Under a certain window of conditions, volume exclusion of the nanoparticle body near the medium/sensor interface is substantial and affects the properties of the reaction layer and the overall lability of the nanoparticulate MS complex toward the reactive surface.
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Affiliation(s)
- Raewyn M Town
- Systemic Physiological and Ecotoxicological Research (SPHERE), Department of Biology, University of Antwerp , Groenenborgerlaan 171, 2020 Antwerp, Belgium
- Physical Chemistry and Soft Matter, Wageningen University & Research , Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - José Paulo Pinheiro
- Université de Lorraine , Laboratoire Interdisciplinaire des Environnements Continentaux, UMR 7360 CNRS, 15 avenue du Charmois, 54500 Vandoeuvre-les-Nancy, France
- Physical Chemistry and Soft Matter, Wageningen University & Research , Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - Herman P van Leeuwen
- Physical Chemistry and Soft Matter, Wageningen University & Research , Stippeneng 4, 6708 WE Wageningen, The Netherlands
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Abstract
Humic acids are a part of humus material, are abundant in nature, and form a substantial pool of natural organic matter. They participate in the transport of both beneficial and harmful species. Due to their structure and properties, they can interact with metal ions and, with them, form relatively stable complexes. These substances are thus responsible for the so-called self-cleaning ability of soils. Lignite as a young coal type contains a relatively high amount of humic acids which can be used as an environmentally-friendly adsorbent for heavy metals. In this work, we compared the adsorption of single Cu2+ions with the simultaneous adsorption of several different metal ions (Cd2+, Cu2+, Pb2+, and Zn2+). The adsorption efficiency of humic acids was very high, almost 100% in the case of the single adsorption of Cu2+ions and more than 90% for the adsorption from the mixture of metal ions. The stability of formed complexes, considered on the basis of the leaching in different extraction agents, was higher than 80%; only 9–18% was in the mobile phase. After adsorption, metal ions are contained in humic acids after adsorption in mainly strongly bonded form (60–73%) and can be liberated from their structure only in low amounts.
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Town RM, van Leeuwen HP. Intraparticulate Metal Speciation Analysis of Soft Complexing Nanoparticles. The Intrinsic Chemical Heterogeneity of Metal–Humic Acid Complexes. J Phys Chem A 2016; 120:8637-8644. [DOI: 10.1021/acs.jpca.6b08543] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Raewyn M. Town
- Department
of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense, Denmark
- Physical Chemistry and Soft Matter, Wageningen University & Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
- Systemic Physiological and Ecotoxicological
Research (SPHERE), Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Herman P. van Leeuwen
- Physical Chemistry and Soft Matter, Wageningen University & Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
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Town RM, van Leeuwen HP. Metal ion–humic acid nanoparticle interactions: role of both complexation and condensation mechanisms. Phys Chem Chem Phys 2016; 18:18024-32. [DOI: 10.1039/c6cp02634f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A counterion condensation – Donnan electrostatic model provides a physicochemically consistent description of intraparticulate metal species distributions in humic acid nanoparticles.
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Affiliation(s)
- Raewyn M. Town
- Department of Physics
- Chemistry and Pharmacy
- University of Southern Denmark
- 5230 Odense
- Denmark
| | - Herman P. van Leeuwen
- Physical Chemistry and Soft Matter
- Wageningen University & Research
- 6708 WE Wageningen
- The Netherlands
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