Transport and retention of polymer-stabilized zero-valent iron nanoparticles in saturated porous media: Effects of initial particle concentration and ionic strength

Esfahani, Amirhosein Ramazanpour; Firouzi, Ahmad Farrokhian; Sayyad, Gholamabbas; Kiasat, Ali Reza

doi:10.1016/j.jiec.2013.10.054

Cited by 43 publications

(9 citation statements)

References 59 publications

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“…However, a recent study has found that ultrasound assisted synthesis can provide more crystallinity to Fe(0) [118]. Peak broadening generally occurs due to surfactant artefacts in surfactant stabilised nZVI samples [37,119], sample ageing [120] or reactions with contaminants [53,68,[121][122][123][124][125]. Some polymers (e.g., polyacrylic acid, polyvinylpyrrolidone) stabilised nZVI samples may show no XRD peak of iron phases due to the combination of amorphous and non-crystalline phases and surfactant artefacts [119].…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

“…in order to understand how these different factors can affect the mobility and reactivity of nZVI (e.g. [40,[150][151][152][153][154][155][156]). These studies have found that increasing the ionic strength of the solution will increase both particle aggregation (ref) and particle deposition onto soil grains (ref).…”

Section: Analytical Challenges For Characterizing Nzvi In Real Groundmentioning

confidence: 99%

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Analytical characterisation of nanoscale zero-valent iron: A methodological review

Chekli

Bayatsarmadi

Sekine

et al. 2016

Analytica Chimica Acta

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Zero-valent iron nanoparticles (nZVI) have been widely tested as they are showing significant promise for environmental remediation. However, many recent studies have demonstrated that their mobility and reactivity in subsurface environments are significantly affected by their tendency to aggregate. Both the mobility and reactivity of nZVI mainly depends on properties such as particle size, surface chemistry and bulk composition. In order to ensure efficient remediation, it is crucial to accurately assess and understand the implications of these properties before deploying these materials into contaminated environments. Many analytical techniques are now available to determine these parameters and this paper provides a critical review of their usefulness and limitations for nZVI characterisation. These analytical techniques include microscopy and light scattering techniques for the determination of particle size, size distribution and aggregation state, and X-ray techniques for the characterisation of surface chemistry and bulk composition. Example characterisation data derived from commercial nZVI materials is used to further illustrate method strengths and limitations. Finally, some important challenges with respect to the characterisation of nZVI in groundwater samples are discussed.

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Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Section: Analytical Challenges For Characterizing Nzvi In Real Groundmentioning

confidence: 99%

Analytical characterisation of nanoscale zero-valent iron: A methodological review

Chekli

Bayatsarmadi

Sekine

et al. 2016

Analytica Chimica Acta

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“…Figure 12 shows the restriction in flow of nanospheres in Berea sandstone from observing the inlet/injection point of the cores after the displacement tests at different nanospheres concentrations. Esfahani et al (2014) reported there are some physical factors that affect a nanoparticles transport in subsurface situation such as initial particle concentration, flow velocity, grain size and depth of porous media. Meanwhile the chemical factors are caused by ionic strength, pH and organic matter.…”

Section: Displacement Mechanismmentioning

confidence: 99%

Polymeric nanospheres as a displacement fluid in enhanced oil recovery

Hendraningrat

Zhang

2015

Appl Nanosci

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This paper presents the investigation of using nanoscale polyacrylamide-based spheres (nanospheres) as a displacement fluid in enhanced oil recovery (EOR). Coreflood experiments were conducted to evaluate the impact of nanospheres and its concentration dispersed in model formation water on oil recovery during a tertiary oil recovery process. The coreflood results showed that nanospheres can enhance residual oil recovery in the sandstone rock samples and its concentration showed a significant impact into incremental oil. By evaluating the contact angle, it was observed that wettability alteration also might be involved in the possible oil displacement mechanism in this process together with fluid behavior and permeability to water that might divert injected fluid into unswept oil areas and enhance the residual oil recovery. These investigations promote nanospheres aqueous disperse solution as a potential displacement fluid in EOR.

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“…Aggregation, it is believed, possibly reduces the specific surface area and the interfacial free energy, thereby dropping reactivity of and spoiling the unequaled features of nanoparticles [35]. In order to either prevent or decrease the agglomeration of nanoparticles, various stabilizers have been found to be effective for stabilizing nanoparticles, including clay minerals [36], carboxylic acids [37], and polymers [38,39].…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Adsorption of cadmium onto modified nanosized magnetite: kinetic modeling, isotherm studies, and process optimization

Babaei

Bahrami

Firouzi

et al. 2014

Desalination and Water Treatment

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In this study, adsorptive removal of cadmium(II) from aqueous solutions using sodium dodecyl sulfate-modified magnetite nanoparticles was modeled. To this aim, central composite design as one of the most favorable designs in response surface methodology (RSM) was employed to optimize the removal of Cd(II) from solution under different variables such as adsorbent dosage (0.1-0.55 g), initial ion concentration (6-90 mg/L), and reaction time (5-30 min). Furthermore, the experimental data of Cd(II) adsorption were tested with various kinetic and isotherm models at various initial ion concentrations of 10-50 mg/L and adsorbent dosages of 0.1-0.25 g. The adsorption process followed the intra-particle diffusion model (R 2 > 0.94) very well. The equilibrium adsorption data were analyzed using various isotherm models. The results showed that Freundlich isotherm, with a relatively high coefficient of determination (R 2 > 0.96), fits well with the experimental results of Cd(II) adsorption. Ultimately, the optimum Cd(II) ions removal of 91.07% was obtained at the reaction time of 30 min, the adsorbent dosage of 0.35 g, and the initial ion concentration of 30 mg/L.

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Transport and retention of polymer-stabilized zero-valent iron nanoparticles in saturated porous media: Effects of initial particle concentration and ionic strength

Cited by 43 publications

References 59 publications

Analytical characterisation of nanoscale zero-valent iron: A methodological review

Analytical characterisation of nanoscale zero-valent iron: A methodological review

Polymeric nanospheres as a displacement fluid in enhanced oil recovery

Adsorption of cadmium onto modified nanosized magnetite: kinetic modeling, isotherm studies, and process optimization

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