Contrasting Roles Of Natural Organic Matter On Colloidal Stabilization And Flocculation In Freshwaters

Reinhardt, Alain

doi:10.1201/9780203485330.ch7

Cited by 12 publications

(3 citation statements)

References 153 publications

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“…The apparent higher amount of adsorbed Dextran is related to the presence of nanoFeH on the surface of illite platelets, which leads to the following questions: what is the exact mechanism of aggregate formation and what is the exact role played by nanoFeH? The affinity of iron oxides for organic matter was reported in numerous studies (Reinhardt and Wilkinson, 2004;Cloy et al, 2014;Vindedahl et al, 2016;Sowers et al, 2018b), so that it is likely that the presence of nanoFeH enhanced Dextran adsorption. For Fe-montmorillonite heteroaggregates (Ji et al, 2004), it was suggested that the presence of FeH reduced the charge and electric field of clay particles.…”

Section: Influence Of Nanofeh On Illite-dextran Interactionsmentioning

confidence: 93%

Controlled assembly of heterogeneous aggregates of clay, iron hydr(oxydes) and polysaccharide: Effects of preparation conditions

Henry

Montargès-Pelletier

Bihannic

et al. 2022

Applied Clay Science

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Section: Influence Of Nanofeh On Illite-dextran Interactionsmentioning

confidence: 93%

Controlled assembly of heterogeneous aggregates of clay, iron hydr(oxydes) and polysaccharide: Effects of preparation conditions

Henry

Montargès-Pelletier

Bihannic

et al. 2022

Applied Clay Science

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“…(Buffle et al, 1998) The highly negative charge of HS results from many carboxyl-groups, which are deprotonated at environmental pH values. HS are generally thought to electrostatically stabilize colloids against aggregation, as adsorption increases negative charge of mineral surfaces or induces charge reversal of positively charged surfaces (Buffle et al, 1998;Reinhardt and Wilkinson, 2004;Srivastava et al, 2018). Adsorption of low-MW HS is kinetically favorable, but their hydrophilicity eases desorption and HS will be replaced by higher-MW, aromatic, hydrophobic NOM, the adsorption of which is thermodynamically favored (Philippe and Schaumann, 2014).…”

Section: Pedogenic Hs Counteract Epsmentioning

confidence: 99%

Freshwater Suspended Particulate Matter – Key Components and Processes in Floc Formation and Dynamics.

Walch¹,

Kammer²,

Hofmann³

2022

Preprint

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Freshwater suspended particulate matter (SPM) plays an important role in many biogeochemical cycles and serves multiple ecosystem functions. Most SPM is present as complex floc-like aggregate structures composed of various minerals and organic matter from the molecular to the organism level. Flocs provide habitat for microbes and feed for larger organisms. They constitute microbial bioreactors, with prominent roles in carbon and inorganic nutrient cycles, and transport nutrients as well as pollutants, affecting sediments, inundation zones, and the ocean. Composition, structure, size and concentration of SPM flocs are subject to high spatiotemporal variability. Floc formation processes and compositional or morphological dynamics can be established around three crucial components: phyllosilicates, iron oxides/(oxy)hydroxides (FeOx) and microbial extracellular polymeric substances (EPS). These components and their interactions increase heterogeneity in surface properties, enhancing flocculation. Phyllosilicates exhibit intrinsic heterogeneities in surface charge and hydrophobicity. They are preferential substrates for precipitation or attachment of reactive FeOx. FeOx form patchy coatings on minerals, especially phyllosilicates, which increase surface charge heterogeneities. Both, phyllosilicates and FeOx strongly adsorb natural organic matter (NOM), preferentially certain EPS. EPS comprise various substances with heterogeneous properties that make them a sticky mixture enhancing flocculation. Microbial metabolism, and thus EPS release, is supported by the high adsorption capacity and favorable nutrient composition of phyllosilicates and FeOx supply essential Fe.

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“…Esse fato também é confirmado pela ausência da banda em 1.384 cm -1 , característica dos nitratos, que aparece ao final da compostagem (GRUBE et al, 2006 Figura 4-1 -Modelo de dupla camada elétrica de Gouy-Chapman-Stern-Grahame: (a) distribuição de cargas; (b) distribuição do potencial elétrico (JOLIVET, 1994 1 apud REINHARDT, 2004) No modelo de troca iônica, os prótons presentes nos grupos ligantes presentes na superfície sólida do adsorvente (R-COOH e R-OH) são substituídos por íons metálicos.…”

Section: Oxi-hidróxidos De Ferro Cristalinounclassified

Zn, Ni, Cr, Cu, Fe e S em Iodo de esgoto: comportamento químico, adsorção e proposta de tratamento

Pinheiro¹

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Contrasting Roles Of Natural Organic Matter On Colloidal Stabilization And Flocculation In Freshwaters

Cited by 12 publications

References 153 publications

Controlled assembly of heterogeneous aggregates of clay, iron hydr(oxydes) and polysaccharide: Effects of preparation conditions

Controlled assembly of heterogeneous aggregates of clay, iron hydr(oxydes) and polysaccharide: Effects of preparation conditions

Freshwater Suspended Particulate Matter – Key Components and Processes in Floc Formation and Dynamics.

Zn, Ni, Cr, Cu, Fe e S em Iodo de esgoto: comportamento químico, adsorção e proposta de tratamento

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