High molecular weight components of natural organic matter preferentially adsorb onto nanoscale zero valent iron and magnetite

Li, Zhixiong; Lowry, Gregory V.; Fan, Jiangbo; Liu, Fei; Chen, Jiawei

doi:10.1016/j.scitotenv.2018.02.038

Cited by 27 publications

(9 citation statements)

References 58 publications

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“…(19‐0629). The XRD pattern ascertained in the present work was quite distinctive as reported for zero‐valent Fe‐NPs . The results are similar to the formerly reported works.…”

Section: Resultssupporting

confidence: 91%

Biogenic fabrication of iron nanoadsorbents from mixed waste biomass for aqueous phase removal of alizarin red S and tartrazine: Kinetics, isotherm, and thermodynamic investigation

Gautam

Shivapriya

Banerjee

et al. 2019

Env Prog and Sustain Energy

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Present work deals with the facile and ecologically viable production of iron nanoadsorbents by utilizing different waste plant biomass, orange peel, flower waste, and environmentally harmful Alligator weed. The as‐prepared nanoadsorbents were applied for the aqueous phase minimization of toxic dyes, alizarin red S and tartrazine. Different techniques, namely, X‐ray diffraction, Fourier transform infra‐red spectroscopy, scanning electron microscopy, dynamic light scattering and magnetic properties measurement system, were applied to characterize the synthesized material. Impact of various experimental conditions like pH, adsorbent dose, contact time, and temperature on removal trend was examined. The acidic medium positively favored the process of sorption. Kinetic analysis revealed that the adsorption of both the dyes followed pseudo‐second‐order kinetic model. Equilibrium sorption data were fitted better to Freundlich model as compared with Langmuir model. The maximum adsorption capacities at 50°C were 42.58 and 68.78 mg g–1 for alizarin red S and tartrazine at pH 4.0 and 2.0, respectively. Thermodynamic parameters exhibited that the sorption of both the dyes onto nanoadsorbent was spontaneous and endothermic with increased randomness at the solid–liquid interface. Desorption experiment demonstrated that the regenerated adsorbent can be recycled efficiently up to three times. Overall, the prepared nanomaterials exhibit remarkable removal competency for both dyes tested like alizarin red S and tartrazine.

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“…(19‐0629). The XRD pattern ascertained in the present work was quite distinctive as reported for zero‐valent Fe‐NPs . The results are similar to the formerly reported works.…”

Section: Resultssupporting

confidence: 91%

Biogenic fabrication of iron nanoadsorbents from mixed waste biomass for aqueous phase removal of alizarin red S and tartrazine: Kinetics, isotherm, and thermodynamic investigation

Gautam

Shivapriya

Banerjee

et al. 2019

Env Prog and Sustain Energy

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“…Li et al reported that the intermediate MW fractions of SRHA (2−6 kDa) and large SRFA MW fractions (>3.5 kDa) preferentially adsorb onto nano zerovalent iron (nZVI). 6 Other studies have reported preferential adsorption of lower, 7,8 intermediate, 9 or higher 10−12 MW fractions of NOM onto hematite, goethite, and magnetite. Preferential adsorption of higher MW NOM onto Fh has been reported in some studies 13−15 while Gentile et al report preferential adsorption of lower MW (i.e., noncolloidal) fractions of soil NOM.…”

Section: ■ Introductionmentioning

confidence: 96%

“…For adsorbed mass, the chemical and physical properties of NOM, including functional group composition, charge, and MW, can be important, but contradictory results have been reported in the literature. Li et al reported that the intermediate MW fractions of SRHA (2–6 kDa) and large SRFA MW fractions (>3.5 kDa) preferentially adsorb onto nano zerovalent iron (nZVI) . Other studies have reported preferential adsorption of lower, , intermediate, or higher − MW fractions of NOM onto hematite, goethite, and magnetite.…”

Section: Introductionmentioning

confidence: 99%

Natural Organic Matter (NOM) Imparts Molecular-Weight-Dependent Steric Stabilization or Electrostatic Destabilization to Ferrihydrite Nanoparticles

Shakiba

Deng

et al. 2020

Environ. Sci. Technol.

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Ferrihydrite nanoparticles (Fh NPs) are ubiquitous in natural environments. However, their colloidal stability, and fate and transport behavior are difficult to predict in the presence of heterogeneous natural organic matter (NOM) mixtures. Here, we investigated the adsorption and aggregation behavior of Fh NPs exposed to NOM fractions with different molecular weights (MW). The NOM fraction with MW < 3 kDa destabilized the NPs, resulting in accelerated aggregation even at high C/Fe mass ratios, whereas higher MW NOM fractions imparted better colloidal stability with increasing MW and C/Fe ratio. Despite differences in the functional group composition of the bulk (dissolved) NOM fractions, all NOM fractions produced similar adsorbed layer compositions on the NPs, suggesting minimal contribution of chemical properties to the distinctive aggregation behavior. Rather, the higher adsorbed mass and larger size of the higher MW fractions were key factors in stabilizing the NPs through steric repulsion, whereas the lowest MW fraction had low adsorbed mass and was unable to counter electrostatic patch-charge attraction when the NPs are positively charged. This mechanistic understanding helps us predict the transport and fate of Fh NPs and the associated contaminants in natural environments with varying NOM compositions.

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“…By comparison with the behaviour of bovine albumin serum (molecular mass 66.5 kDa) and lysozyme from egg (molecular mass = 14.4 kDa), we infer that the HA solutions tested contain a population of molecules with hydrodynamic volumes ranging between these two extremes ( Figure 3). It is worth noting that the humic acid sample analysed in this study, on the basis of recent studies of Li and coworkers [33], can easily be removed from aqueous solutions by adsorption on nanoscale zero-valent iron and magnetite. It is pertinent to note, however, that size-exclusion chromatography does not permit an accurate determination of the molar mass of polyelectrolyte molecules lacking a stable three-dimensional structure, as is probably the case for HA because the hydrodynamic volume of these compounds varies with pH and ionic strength.…”

Section: Size-exclusion Chromatography (Sec)mentioning

confidence: 99%

Macromolecular Structure of a Commercial Humic Acid Sample

et al. 2020

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The molecular structure of a commercial sample of humic acids (HA) was investigated by membrane dialysis experiments (MD) and low-pressure size-exclusion chromatography (LP-SEC). MD showed that HA molecules were retained by dialysis membrane with a cut-off of 6-8 kDa, independently from HA concentration (15 or 150 mg L −1 ), NaHCO 3 concentration (0.005-2.0 mol L −1 ), and from propan 2-ol (0-5 v/v %). SEC experiments at low pressure gave chromatograms with a broad peak, with an elution volume between those of the globular proteins bovine serum albumin (molecular weight = 66.5 kDa) and lysozyme from egg (molecular weight = 14.4 kDa). The pattern of the chromatogram did not vary with HA concentration, and second-run chromatograms of single eluted fractions showed relatively sharp peaks. From these data, we reveal that the commercial HA sample analysed has a macromolecular structure rather than being a supramolecular aggregate of relatively small molecules, as recently proposed for some samples of HA obtained from different sources.

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High molecular weight components of natural organic matter preferentially adsorb onto nanoscale zero valent iron and magnetite

Cited by 27 publications

References 58 publications

Biogenic fabrication of iron nanoadsorbents from mixed waste biomass for aqueous phase removal of alizarin red S and tartrazine: Kinetics, isotherm, and thermodynamic investigation

Biogenic fabrication of iron nanoadsorbents from mixed waste biomass for aqueous phase removal of alizarin red S and tartrazine: Kinetics, isotherm, and thermodynamic investigation

Natural Organic Matter (NOM) Imparts Molecular-Weight-Dependent Steric Stabilization or Electrostatic Destabilization to Ferrihydrite Nanoparticles

Macromolecular Structure of a Commercial Humic Acid Sample

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