Transport of carboxymethyl cellulose stabilized iron nanoparticles in porous media: Column experiments and modeling

He, Feng; Zhang, Man; Qian, Tianwei; Zhao, Dongye

doi:10.1016/j.jcis.2009.02.058

Cited by 255 publications

(146 citation statements)

References 34 publications

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“…It varied inversely with TiO 2 NPs size in the influent, which increased from 5.90 9 10 -3 for 0.5 mg L -1 HS (TiO 2 NPs size of 977 nm) to 1.10 9 10 -2 for 10 mg L -1 HS (TiO 2 NPs size of 442 nm). Numerous previous studies have reported diffusion as the predominant mechanism for deposition of nanoparticles \100 nm in porous media (He et al 2009;Rahman et al 2013;Zhuang et al 2005). Due to the large aggregate size of TiO 2 NPs, gravitational sedimentation played an important role in this study.…”

Section: Physical Filtration Effectmentioning

confidence: 81%

Facilitated transport of titanium dioxide nanoparticles by humic substances in saturated porous media under acidic conditions

Zhang

et al. 2015

J Nanopart Res

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The transport behavior of titanium dioxide nanoparticles (TiO 2 NPs, 30 nm in diameter) was studied in well-defined porous media composed of clean quartz sand over a range of solution chemistry under acidic conditions. Transport of TiO 2 NPs was dramatically enhanced by humic substances (HS) at acidic pH (4.0, 5.0 and 6.0), even at a low HS concentration of 0.5 mg L -1 . Facilitated transport of TiO 2 NPs was likely attributable to the increased stability of TiO 2 NPs and repulsive interaction between TiO 2 NPs and quartz sands due to the adsorbed HS. The mobility of TiO 2 NPs was also increased with increasing pH from 4.0 to 6.0. Although transport of TiO 2 NPs was insensitive to low ionic strength, it was significantly inhibited by high concentrations of NaCl and CaCl 2 . In addition, calculated Derjaguin-LandauVerwey-Overbeek (DLVO) interaction energy indicated that high energy barriers were responsible for the high mobility of TiO 2 NPs, while the secondary energy minimum could play an important role in the retention of TiO 2 NPs at 100 mmol L -1 NaCl. Straining and gravitational settlement of larger TiO 2 NPs aggregates at 1 mg L -1 HS, pH 5.0, and 2 mmol L -1 CaCl 2 could be responsible for the significant retention even in the presence of high energy barriers. Moreover, more favorable interaction between approaching TiO 2 NPs and TiO 2 NPs that had been already deposited on the collector resulted in a ripening-shape breakthrough curve at 2 mmol L -1 CaCl 2 . Overall, a combination of mechanisms including DLVO-type force, straining, and physical filtration was involved in the retention of TiO 2 NPs over the range of solution chemistry examined in this study.

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Section: Physical Filtration Effectmentioning

confidence: 81%

Facilitated transport of titanium dioxide nanoparticles by humic substances in saturated porous media under acidic conditions

Zhang

et al. 2015

J Nanopart Res

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“…Nanoparticles quantitative information detailed relating to transport behavior in porous media remains lacking yet [20]. Contaminated medium composition and environmental conditions in natural systems such as the presence of humic acid (the mobility is increased in the presence of humic acid) in subsurface, as well as ionic strength of the resident water, influences and modifies nanoparticle mobility.…”

Section: Environmental Cleanup: Benefits and Limits Of Nano-based Tecmentioning

confidence: 99%

Nanoparticles Restrictions in Environmental Cleanup

Snousy¹,

Mf²

2017

Nano Res Appl

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Environmental contamination with a variety and mixed pollutants are a problematic issue worldwide. If the contaminated sites are left without any satisfactory remediation, it leads to the successive threaten of ecosystems, then human life. So, applications of nanotechnology in environmental remediation are encouraged because of the novel properties (e.g. special structure, very large surface area and greater reactivity), whereas, ''Nano'' may be more than just ''small''. Also, environmental nanotechnology restraint is due to lack of full understanding characterization, fate and transport of such ultrafine materials in the environment. The objective of this work is to point major challenges facing environmental nanoscience and urges developing eco-friendly techniques to ensure good quality of life.

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“…They also estimated that under specified injection pressure, the maximum travel distance of the nanoparticles is 1.11 m, and the delivered nanoparticles would remain in the sediment when the external pressure is released. He et al [94] tested and modeled transport of CMCstabilized ZVI nanoparticles through various porous media (coarse glass bead, find glass bead, sand, and sandy soil). They not only demonstrated the soil deliverability but also showed that the filtration removal or the maximum travel distance of the nanoparticles was a function of the injection pressure or pore flow velocity.…”

Section: Transport Of Stabilized Nanoparticlesmentioning

confidence: 99%

Application of Stabilized Nanoparticles for In Situ Remediation of Metal-Contaminated Soil and Groundwater: a Critical Review

et al. 2015

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Remediation of soil and groundwater contaminated with toxic metals has been a major environmental challenge for decades. Yet, cost-effective and sustainable in situ remediation technologies remain lacking. Over the last 15 years or so, an innovative in situ remediation strategy has shown promising by means of stabilized nanoparticles. Stabilized nanoparticles are prepared using novel stabilizers that facilitate the deliverability and transport of nanoparticles in the subsurface. This study reviews synthesis and characterization of some model stabilized nanoparticles and their application for remediation of metal-contaminated soil and water. Fate and transport of these stabilized nanoparticles in groundwater and soil are also examined. Lastly, this review identifies the key knowledge gaps such as lack of field data pertaining to the long-term effectiveness of the immobilized metals and impacts of the delivered nanoparticles on the biogeochemical conditions in the subsurface. The information may facilitate further development of this promising remediation technology.

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Transport of carboxymethyl cellulose stabilized iron nanoparticles in porous media: Column experiments and modeling

Cited by 255 publications

References 34 publications

Facilitated transport of titanium dioxide nanoparticles by humic substances in saturated porous media under acidic conditions

Facilitated transport of titanium dioxide nanoparticles by humic substances in saturated porous media under acidic conditions

Nanoparticles Restrictions in Environmental Cleanup

Application of Stabilized Nanoparticles for In Situ Remediation of Metal-Contaminated Soil and Groundwater: a Critical Review

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