Stability studies for titanium dioxide nanoparticles upon adsorption of Suwannee River humic and fulvic acids and natural organic matter

Erhayem, Mohamed; Sohn, Mary

doi:10.1016/j.scitotenv.2013.08.038

Cited by 142 publications

(75 citation statements)

References 40 publications

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“…The metal complexion may further facilitate more crystal planes and surface defects to the humic acid and promote dissolution of ZnO NPs. Interestingly, the citric acid sample shows a significant shift of 83 cm −1 i.e., 1722 to 1639 cm −1 in carboxylate (-COO-) group (Figure 3C), indicating strong inner sphere complexation with the ZnO surface [38,42]. In addition, the strong adsorption may be either via polynuclear-polydentate linkage or mononuclear-polydentate linkage between citrate and ZnO, thus resulting in weakened bonds in the metal-oxygen surface due to polarization [48,49].…”

Section: Ft-ir Analysis Pristine Nom and Zno-nom Complexesmentioning

confidence: 99%

“…However, the presence of (2.5-25 mg/L) citric acid induced a dose-dependent decline in SE of NPs, while SE remarkably increased at 100 mg/L concentration ( Figure 2A). This suggests the existence of three carboxylic groups in citric acid which are mostly deprotonated and might contribute more negative charges on the particle surface after ionization at neutral pH (pKa1 = 3.13, pKa2 = 4.76 and pKa3 = 6.40) [16,30,42]. This causes a significant decrease in NPs Van der Waals (vdW) forces, but an increase in repulsive electrostatic forces between ZnO NPs.…”

Section: Impact Of Nom On the Sedimentation Of Zno Npsmentioning

confidence: 99%

“…This suppression happened due to increased adsorption of organic acid on the NPs Furthermore, the sedimentation curve became mildly steeper in the presence of lower concentration (1 mg/L) of humic acid and salicylic acid, indicating low concentration of both NOM unstable the NPs, while the higher concentration i.e., (25-100 mg/L) impedes the aggregation process ( Figure 4C,D). This suppression happened due to increased adsorption of organic acid on the NPs surface, Thus, the stability of suspension was enhanced markedly [40,42], whereas the first-order kinetics model did not fit well with the aggregation curve ( Table 4). The presence of a lower concentration of citric acid (1-10 mg/L) lowers the settling rate than those in the absence of NOM ( Figure 4E).…”

Section: Zno Nps Aggregation Kinetics Exposed To Various Environmentamentioning

confidence: 99%

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Assessment of Key Environmental Factors Influencing the Sedimentation and Aggregation Behavior of Zinc Oxide Nanoparticles in Aquatic Environment

Khan

Inam

Zam

et al. 2018

Water

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Zinc oxide nanoparticles (ZnO NPs) are among the most widely used engineered nanoparticles (ENPs) in various commercial sectors to achieve both social and economic benefits. The post-use release of these NPs to the environment is inevitable, and may pose threat to the human and eco-system. In the present study, we investigated the influence of single and multiple environmental factors on sedimentation behavior of ZnO NPs. The fractional-factorial method based on Taguchi orthogonal array (OA) L 27 (3 13 ) design matrix was used for systematic investigation on the contribution and significance of multiple factors and their interactions. The result of single-factor showed that the ZnO NPs were unstable at or near pH zpc , with high electrolyte concentration; however, the adsorption of natural organic matter (NOM) i.e., humic acid, salicylic acid, and citric acid reverses the surface charge and enhanced NP stability. The Fourier transform infrared (FT-IR) analysis confirms the organic capping ligands on the NP surface. Moreover, the matrix result of analysis of variance (ANOVA) showed that electrolyte concentration and type, and NOM concentration were the most significant factors (p < 0.001) in promoting and influencing aggregation, while the interaction between the factors was also found insignificant. In addition, the result of aggregation kinetics and environmental water samples indicated that the mobility of ENPs may vary substantially in an environment with complex and heterogeneous matrices. This study may contribute to better understanding and prediction of the sedimentation behavior and fate of ZnO NPs in aqueous environments, to facilitate their sustainable use in products and process.

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Section: Ft-ir Analysis Pristine Nom and Zno-nom Complexesmentioning

confidence: 99%

Section: Impact Of Nom On the Sedimentation Of Zno Npsmentioning

confidence: 99%

Section: Zno Nps Aggregation Kinetics Exposed To Various Environmentamentioning

confidence: 99%

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Assessment of Key Environmental Factors Influencing the Sedimentation and Aggregation Behavior of Zinc Oxide Nanoparticles in Aquatic Environment

Khan

Inam

Zam

et al. 2018

Water

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“…There are many functional groups in HA molecules, and the functional groups endow the molecules some abilities to functionalize as an electron-transfer mediator during organic contaminants degradation processes [5][6][7]. HA molecules could also cause some adverse environmental consequences due to the characteristics of HA molecules.…”

Section: Introductionmentioning

confidence: 99%

Enhanced removal for humic-acid (HA) and coagulation process using carbon nanotubes (CNTs)/polyalumium chloride (PACl) composites coagulants

Jiao

Xiao

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Some types of DOM, such as fulvic and humic acids, electrostatically stabilize ENPs via the adsorption of the electrically charged DOM on the ENP surface (12)(13)(14)(15)(16), where the strength of the stabilization is correlated (although not linearly) with the amount of DOM adsorbed (17) and varies with its chemical structure (11,12,18,19). In other settings, particularly in the presence of divalent cations, DOM such as polysaccharides and polypeptides enhances the aggregation of ENPs by forming bridges between the particles (20)(21)(22)(23)(24).…”

mentioning

confidence: 99%

A network perspective reveals decreasing material diversity in studies on nanoparticle interactions with dissolved organic matter

Sani-Kast

Labille

Ollivier

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Dissolved organic matter (DOM) strongly influences the properties and fate of engineered nanoparticles (ENPs) in aquatic environments. There is an extensive body of experiments on interactions between DOM and ENPs and also larger particles. [We denote particles on the nano-and micrometer scale as particulate matter (PM).] However, the experimental results are very heterogeneous, and a general mechanistic understanding of DOM-PM interactions is still missing. In this situation, recent reviews have called to expand the range of DOM and ENPs studied. Therefore, our work focuses on the diversity of the DOM and PM types investigated. Because the experimental results reported in the literature are highly disparate and difficult to structure, a new format of organizing, visualizing, and interpreting the results is needed. To this end, we perform a network analysis of 951 experimental results on DOM-PM interactions, which enabled us to analyze and quantify the diversity of the materials investigated. The diversity of the DOM-PM combinations studied has mostly been decreasing over the last 25 y, which is driven by an increasing focus on several frequently investigated materials, such as DOM isolated from fresh water, DOM in whole-water samples, and TiO 2 and silver PM. Furthermore, there is an underrepresentation of studies into the effect of particle coating on PM-DOM interactions. Finally, it is of great importance that the properties of DOM used in experiments with PM, in particular the molecular weight and the content of aromatic and aliphatic carbon, are reported more comprehensively and systematically.nanoparticles | dissolved organic matter | environmental fate | network analysis | experimental design T he development and use of nanotechnology results in the release of engineered nanoparticles (ENPs) to the environment (1, 2). Much effort in current research is put into assessing the environmental risks of ENPs, which requires the understanding of the fate and distribution of ENPs in different environmental media, as well as their potential toxicity (3-6). Dissolved organic matter (DOM) (e.g., humic substances, polysaccharides, and proteins) is ubiquitous in aquatic systems and is known to interact with ENPs and modify their surface properties (7). DOM has been shown to either stabilize or destabilize aqueous ENP suspensions, depending on DOM properties and medium composition (8, 9). The effects of DOM on the stability of ENP suspensions are expected to strongly influence the mobility and distribution of ENPs in the environment (10).The extraordinary variability in DOM effects on ENPs originates from the fact that the interactions between DOM and ENPs depend on numerous interrelated factors, such as pH and ionic strength of the media, the particles' surface properties and size, and the chemical composition and concentration of the DOM (11). Some types of DOM, such as fulvic and humic acids, electrostatically stabilize ENPs via the adsorption of the electrically charged DOM on the ENP surface (12-16), where the str...

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Stability studies for titanium dioxide nanoparticles upon adsorption of Suwannee River humic and fulvic acids and natural organic matter

Cited by 142 publications

References 40 publications

Assessment of Key Environmental Factors Influencing the Sedimentation and Aggregation Behavior of Zinc Oxide Nanoparticles in Aquatic Environment

Assessment of Key Environmental Factors Influencing the Sedimentation and Aggregation Behavior of Zinc Oxide Nanoparticles in Aquatic Environment

Enhanced removal for humic-acid (HA) and coagulation process using carbon nanotubes (CNTs)/polyalumium chloride (PACl) composites coagulants

A network perspective reveals decreasing material diversity in studies on nanoparticle interactions with dissolved organic matter

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