Cation-mediated cross-linking in natural organic matter: a review

Mouvenchery, Yamuna Kunhi; Kučerík, Jiří; Diehl, Dörte; Schaumann, Gabriele E.

doi:10.1007/s11157-011-9258-3

Cited by 107 publications

(80 citation statements)

References 136 publications

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“…While increasing evidence has been gained supporting the water molecule bridge model (WaMB) on the molecular scale (Aquino et al, 2009;Schaumann and Bertmer, 2008), only lately, new findings about the nature of cation bridges (CaB) in SOM have been obtained. The CaB model is currently under discussion as summarized in the review paper of Kunhi Mouvenchery et al (2012). The current research confirms that multivalent cations can form coordinative cross-links in SOM, but the status of these CaB is determined not only by the interaction between cations and functional groups, but also by the spatial arrangement of the functional groups in the OM matrix (Kunhi Mouvenchery et al, 2012).…”

Section: Introductionsupporting

confidence: 54%

“…A significant factor for matrix rigidity are cross-links between SOM molecule sections mediated by water molecules (Aquino et al, 2009;Schaumann and Leboeuf, 2005;Schaumann and Bertmer, 2008), which currently is the only explanation accounting for the unexpected thermal and aging behavior of peat and numerous soil samples, or by mono-and multivalent cations (Kunhi Mouvenchery et al, 2012;Lu and Pignatello, 2004;Schaumann, 2000). Formation and disruption of water molecule bridges or cation bridges may close or open sorption sites in soil organic matter and immobilize certain otherwise unstable molecular arrangements at the surface.…”

Section: Introductionmentioning

confidence: 99%

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Combined proton NMR wideline and NMR relaxometry to study SOM-water interactions of cation-treated soils

Schaumann¹,

Diehl²,

Bertmer³

et al. 2013

Journal of Hydrology and Hydromechanics

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Focusing on the idea that multivalent cations affect SOM matrix and surface, we treated peat and soil samples by solutions of NaCl, CaCl 2 or AlCl 3 . Water binding was characterized with low field 1 H-NMR-relaxometry (20 MHz) and 1 H wideline NMR spectroscopy (400 MHz) and compared to contact angles. From 1 H wideline, we distinguished mobile water and water involved in water molecule bridges (WaMB). Large part of cation bridges (CaB) between SOM functional groups are associated with WaMB. Unexpectedly, 1 H NMRrelaxometry relaxation rates suggest that cross-linking in the Al-containing peat is not stronger than that by Ca.The relation between percentage of mobile water and WaMB water in the context of wettability and 1 H NMR relaxation times confirms that wettability controls the water film surrounding soil particles. Wettability is controlled by WaMB-CaB associations fixing hydrophilic functional groups in the SOM interior. This can lead to severe water repellency. Wettability decreases with increasing involvement of functional groups in CaB-WaMB associations. The results demonstrate the relevance of CaB and WaMB for the dynamics of biogeochemical and hydrological processes under field conditions, as only a few percent of organic matter can affect the physical, chemical, and biological functioning of the entire 3-phase ecosystem.

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Section: Introductionsupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Combined proton NMR wideline and NMR relaxometry to study SOM-water interactions of cation-treated soils

Schaumann¹,

Diehl²,

Bertmer³

et al. 2013

Journal of Hydrology and Hydromechanics

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“…Humic acid has also the capability to immobilize Ag + ions and is a mild reducer, leading to the formation of new Ag NPs after dissolution of the original ones [134][135][136], with influences on the Ag + release dynamics. Additionally, DOM can immobilize other species, such as divalent cations [137]. These species are then less available to contribute to the Ag NPs destabilization, increasing indirectly their stability.…”

Section: Fate Of Silver Nanoparticles In the Environmentmentioning

confidence: 99%

Antibacterial activity of silver nanoparticles: A surface science insight

2015

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Summary Silver nanoparticles constitute a very promising approach for the development of new antimicrobial systems. Nanoparticulate objects can bring significant improvements in the antibacterial activity of this element, through specific effect such as an adsorption at bacterial surfaces. However, the mechanism of action is essentially driven by the oxidative dissolution of the nanoparticles, as indicated by recent direct observations. The role of Ag + release in the action mechanism was also indirectly observed in numerous studies, and explains the sensitivity of the antimicrobial activity to the presence of some chemical species, notably halides and sulfides which form insoluble salts with Ag + . As such, surface properties of Ag nanoparticles have a crucial impact on their potency, as they influence both physical (aggregation, affinity for bacterial membrane, etc.) and chemical (dissolution, passivation, etc.) phenomena. Here, we review the main parameters that will affect the surface state of Ag NPs and their influence on antimicrobial efficacy. We also provide an analysis of several works on Ag NPs activity, observed through the scope of an oxidative Ag + release.

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Section: Simulations Of Natural Organic Matter (Nom) and Nom-mineral mentioning

confidence: 99%

“…Fortunately, much of the ion coordination activity in NOM has been shown to occur through several key functional groups, including primarily carboxylate groups but also alcohol/phenol groups [86,87]. A recent review paper outlines current understanding of the important effect of cation bridging in NOM aggregation [87]. Indeed, molecular modeling studies of NOM-mineral interfacial systems indicates that cation bridging between NOM and surface sites predominates over direct interactions between NOM functional groups and the surface [88,89], although humic substances can adsorb directly to clay surfaces in confined interlayer environments [90].…”

Section: Simulations Of Natural Organic Matter (Nom) and Nom-mineral mentioning

confidence: 99%

Interaction of Natural Organic Matter with Layered Minerals: Recent Developments in Computational Methods at the Nanoscale

2014

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Abstract:The role of mineral surfaces in the adsorption, transport, formation, and degradation of natural organic matter (NOM) in the biosphere remains an active research area owing to the difficulties in identifying proper working models of both NOM and mineral phases present in the environment. The variety of aqueous chemistries encountered in the subsurface (e.g., oxic vs. anoxic, variable pH) further complicate this field of study. Recently, the advent of nanoscale probes such as X-ray adsorption spectroscopy and surface vibrational spectroscopy applied to study such complicated interfacial systems have enabled new insight into NOM-mineral interfaces. Additionally, due to increasing capabilities in computational chemistry, it is now possible to simulate molecular processes of NOM at multiple scales, from quantum methods for electron transfer to classical methods for folding and adsorption of macroparticles. In this review, we present recent developments in interfacial properties of NOM adsorbed on mineral surfaces from a computational point of view that is informed by recent experiments.

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Cation-mediated cross-linking in natural organic matter: a review

Cited by 107 publications

References 136 publications

Combined proton NMR wideline and NMR relaxometry to study SOM-water interactions of cation-treated soils

Combined proton NMR wideline and NMR relaxometry to study SOM-water interactions of cation-treated soils

Antibacterial activity of silver nanoparticles: A surface science insight

Interaction of Natural Organic Matter with Layered Minerals: Recent Developments in Computational Methods at the Nanoscale

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