Transport and retention behaviors of titanium dioxide nanoparticles in iron oxide-coated quartz sand: Effects of pH, ionic strength, and humic acid

Han, Peng; Wang, Xueting; Cai, Li; Tong, Meiping; Kim, Hyung-Seok

doi:10.1016/j.colsurfa.2014.04.020

Cited by 80 publications

(32 citation statements)

References 59 publications

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“…The IEP of Fe oxide is reported to be at pH 9 (Li, Xu, & Zhang, 2012), which is lower than the pH values tested in this study. Thus, the Fe oxide coating was always positively charged (Han, Wang, Cai, Tong, & Kim, 2014), causing the measured ΔE generated by Fe oxidecoated quartz grains to be larger than that generated by quartz grains. With increasing electrolyte pH, the ΔE of both Fe oxide-coated quartz sand and uncoated quartz sand moved towards a positive value.…”

Section: Effects Of Electrolyte Ph and Fe Oxide Coating On The Strementioning

confidence: 99%

Characterizing surface electrochemical properties of simulated bulk soil in situ by streaming potential measurements

Liu

Wang

et al. 2019

European J Soil Science

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To evaluate the feasibility of using streaming potential to characterize the surface electrochemical properties of soil in situ, a quartz sand‐packed column was used to mimic the porous structure and architecture of bulk soil. A laboratory‐made apparatus was developed to measure in situ the streaming potential of quartz grains in the packed column under environmentally relevant physicochemical conditions (e.g. electrolyte pH, Fe oxide coating on sand grains, transport of goethite and amorphous Al hydroxide colloids, and the presence of humic acid). The results showed a significant positive relation between the measured streaming potentials and zeta potentials of the quartz grains examined. With decreasing electrolyte pH, the streaming potential of the quartz grains became less negative because of the greater protonation effect. Similarly, when Fe oxide was adsorbed on to the quartz surfaces, the streaming potential of Fe oxide‐coated quartz grains was less negative than that of uncoated quartz grains as a result of charge neutralization between positively charged Fe oxide and negatively charged sand grains. However, the streaming potential of Fe oxide‐coated quartz grains became more negative when humic acid was added to the electrolyte solution because of increased adsorption of negatively charged humic acid. Interestingly, an obvious change of streaming potential in the processes of colloidal goethite and amorphous Al hydroxide transport in the sand‐packed column grains occurred. Given that the overall positive charge of the colloidal amorphous Al was greater than that of goethite colloids, transport of amorphous Al colloids was found to exert a stronger effect on the variation in streaming potential of quartz sand. Taken altogether, the in situ streaming potential results showed that streaming potential can be used as a powerful index to characterize directly the surface electrochemical properties of quartz grains representing bulk soil. Highlights The variation in surface electrochemical properties of bulk soil needs investigation. We measured the streaming potential produced by simulated bulk soil using a laboratory‐made apparatus. The streaming potential of bulk soil varied with the change in environmentally relevant conditions. Streaming potential is a powerful index characterizing the surface electrochemical properties of bulk soil.

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Section: Effects Of Electrolyte Ph and Fe Oxide Coating On The Strementioning

confidence: 99%

Characterizing surface electrochemical properties of simulated bulk soil in situ by streaming potential measurements

Liu

Wang

et al. 2019

European J Soil Science

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“…During the elution phase in favorable conditions, the concentration of colloids exiting the column decreases sharply with time indicating that there is negligible reentrainment of previously retained colloids [ Li et al ., ; Tufenkji and Elimelech , , ]. The corresponding profiles of retained colloid concentrations with column length show a classic log linear decrease under favorable conditions (Figure , right column), as predicted by analytical solutions of the advective‐dispersive‐colloid transport equation (discussed in section 3) [ Li et al ., ; Tufenkji and Elimelech , , ; Han et al ., ]. These simple, well defined column‐scale behaviors are due to the straightforward colloid‐collector interactions at the pore scale under favorable conditions.…”

Section: Mean‐field Dlvo Interactions and Experimental Observationsmentioning

confidence: 99%

Predicting colloid transport through saturated porous media: A critical review

et al. 2015

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Understanding and predicting colloid transport and retention in water‐saturated porous media is important for the protection of human and ecological health. Early applications of colloid transport research before the 1990s included the removal of pathogens in granular drinking water filters. Since then, interest has expanded significantly to include such areas as source zone protection of drinking water systems and injection of nanometals for contaminated site remediation. This review summarizes predictive tools for colloid transport from the pore to field scales. First, we review experimental breakthrough and retention of colloids under favorable and unfavorable colloid/collector interactions (i.e., no significant and significant colloid‐surface repulsion, respectively). Second, we review the continuum‐scale modeling strategies used to describe observed transport behavior. Third, we review the following two components of colloid filtration theory: (i) mechanistic force/torque balance models of pore‐scale colloid trajectories and (ii) approximating correlation equations used to predict colloid retention. The successes and limitations of these approaches for favorable conditions are summarized, as are recent developments to predict colloid retention under the unfavorable conditions particularly relevant to environmental applications. Fourth, we summarize the influences of physical and chemical heterogeneities on colloid transport and avenues for their prediction. Fifth, we review the upscaling of mechanistic model results to rate constants for use in continuum models of colloid behavior at the column and field scales. Overall, this paper clarifies the foundation for existing knowledge of colloid transport and retention, features recent advances in the field, critically assesses where existing approaches are successful and the limits of their application, and highlights outstanding challenges and future research opportunities. These challenges and opportunities include improving mechanistic descriptions, and subsequent correlation equations, for nanoparticle (i.e., Brownian particle) transport through soil, developing mechanistic descriptions of colloid retention in so‐called “unfavorable” conditions via methods such as the “discrete heterogeneity” approach, and employing imaging techniques such as X‐ray tomography to develop realistic expressions for grain topology and mineral distribution that can aid the development of these mechanistic approaches.

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“…Adsorbed organics on surfaces have frequently been reported to create a brush-like surface that diminishes colloid retention and/or increases colloid stability (Kretzschmar and Sticher, 1997;Yang et al, 2010Yang et al, , 2011Yang et al, , 2013Yang et al, , 2014Flynn et al, 2012). This diminished colloid retention or increased stability in the presence of adsorbed organics has typically been attributed to steric repulsion which creates a large energy barrier to interaction in a primary minimum (Espinasse et al, 2007;Han et al, 2014). The large energy barrier from steric repulsion predicts no colloid retention on a surface, whereas limited amounts of colloid retention are commonly observed even in the presence of absorbed SOM (Jiang et al, 2012;Han et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…This diminished colloid retention or increased stability in the presence of adsorbed organics has typically been attributed to steric repulsion which creates a large energy barrier to interaction in a primary minimum (Espinasse et al, 2007;Han et al, 2014). The large energy barrier from steric repulsion predicts no colloid retention on a surface, whereas limited amounts of colloid retention are commonly observed even in the presence of absorbed SOM (Jiang et al, 2012;Han et al, 2014). Furthermore, steric repulsion cannot account for enhanced retention of hydrophobic colloids on SOM surfaces (Amirbahman and Olson, 1993).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Types and Amounts of Nanoscale Heterogeneity on Bacteria Retention

Bradford

Sasidharan

Kim

et al. 2018

Front. Environ. Sci.

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Interaction energy calculations that assume smooth and chemically homogeneous surfaces are commonly conducted to explain bacteria retention on solid surfaces, but experiments frequently exhibit signification deviations from these predictions. A potential explanation for these inconsistencies is the ubiquitous presence of nanoscale roughness (NR) and chemical heterogeneity (CH) arising from spatial variability in charge (CH1), Hamaker constant (CH2), and contact angles (CH3) on these surfaces. We present a method to determine the mean interaction energy between a colloid and a solid-water-interface (SWI) when both surfaces contained binary NR and CH. This approach accounts for double layer, van der Waals, Lewis acid-base, and Born interactions. We investigate the influence of NR and CH parameters and solution ionic strength (IS) on interaction energy profiles between hydrophilic and hydrophobic bacteria and the SWI. Increases in CH1 and CH3 reduce the energy barrier and create deeper primary minima on net electrostatically unfavorable surfaces, whereas increasing CH2 diminishes the contribution of the van der Waals interaction in comparison to quartz and makes a more repulsive surface. However, these roles of CH are always greatest on smooth surfaces with larger fractions of CH. In general, increasing CH1 and CH3 have a larger influence on bacteria retention under lower IS conditions, whereas the influence of increasing CH2 is more apparent under higher IS conditions. However, interaction energy profiles are mainly dominated by small fractions of NR, which dramatically lower the energy barrier height and the depths of both the secondary and primary minima. This significantly increases the relative importance of primary to secondary minima interactions on net electrostatically unfavorable surfaces, especially for conditions that produce small energy barriers on smooth surfaces. Energy balance calculations indicate that this primary minimum is sometimes susceptible to diffusive removal depending on the NR and CH parameters.

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Transport and retention behaviors of titanium dioxide nanoparticles in iron oxide-coated quartz sand: Effects of pH, ionic strength, and humic acid

Cited by 80 publications

References 59 publications

Characterizing surface electrochemical properties of simulated bulk soil in situ by streaming potential measurements

Characterizing surface electrochemical properties of simulated bulk soil in situ by streaming potential measurements

Predicting colloid transport through saturated porous media: A critical review

Comparison of Types and Amounts of Nanoscale Heterogeneity on Bacteria Retention

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