Electric-field enhanced reactivity and migration of iron nanoparticles with implications for groundwater treatment technologies: Proof of concept

Černík, Miroslav; Nosek, J.; Filip, Jan; Hrabal, Jaroslav; Elliott, D.; Zbořil, Radek

doi:10.1016/j.watres.2019.01.058

Cited by 24 publications

(3 citation statements)

References 39 publications

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“…Such a low value of ORP may indicate that the concentration of μZVI used in the batch tests was fairly high, as was also reported in study [29] when a low ORP was reached in a highly concentrated system. Due to this, the ORP stayed low compared to the control and also for a longer period of time compared to the previously published data, where nZVI at a low concentration was used and the ORP began to increase after five days [30]. A decrease in the ORP is accompanied with an increase in the pH up to a value of 10.2, which is due to the reduction of water (e.g.…”

Section: Chemistry -Ce Degradation Orp and Phmentioning

confidence: 53%

Cost-Effective Remediation Using Microscale Zvi: Comparison of Commercially Available Products

Pavelková

Stejskal

Vološčuková

et al. 2020

Ecological Chemistry and Engineering S

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Zero-valent iron is very effective in the treatment of groundwater contaminated with chlorinated hydrocarbons and solvents broadly used in industrial production. In terms of its sustainability and cost, a legitimate effort has been devoted to the optimization of the remediation process, which can be demanding and expensive. In this study, the application potential and fundamental properties of several commercial micro-sized zero-valent iron (μZVI) were investigated. Although the manufacturers report the basic parameters of μZVI, it has been shown that the actual reactivity of apparently similar products varies notably. This work was focused on monitoring of frequently occurring contaminants. The actual contaminated water from the Pisecna locality -former landfill of industrial waste, with high levels of chlorinated ethenes and ethanes (PCE, TCE, cis-1,2-DCE and 1,2-DCA) was used for the experiment. The degree of dechlorination reached over 85 % 32 days after the application of μZVI in several samples and a far higher reaction rate for smaller particles was observed. Also, the amount of cis-1,2-DCE, which is characterized by slow decomposition, decreased by more than 95 % over the course of the experiment. Smaller particles showed a much longer sedimentation rate and gradual fractionation was also observed. Monitoring of ORP and pH also suggested that the smaller particles possessed a reduction capacity that was sufficiently high even at the end of the experiment. Laboratory tests with apparently similar μZVI samples indicated considerable differences in their reaction rate and efficiency.

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Section: Chemistry -Ce Degradation Orp and Phmentioning

confidence: 53%

Cost-Effective Remediation Using Microscale Zvi: Comparison of Commercially Available Products

Pavelková

Stejskal

Vološčuková

et al. 2020

Ecological Chemistry and Engineering S

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“…The decrease of the ORP has the same trend in all reactors because of reductive capacity of nZVI and applied DC, which lowering ORP even alone. [8] Nevertheless, in the reactor 1, decreasing reductive ability occurs when the ORP slowly increase. The level of conductivity in the reactor can be attributed to several factors.…”

Section: Ph Orp Conductivity Development Within Reductive Dechlorinationmentioning

confidence: 99%

LABORATORY COMPARISON OF nZVI / S-nZVI EFFICIENCY IN SYSTEMS WITH AND WITHOUT POWER

Vološčuková¹,

Skácelová²,

Pavelková³

et al. 2020

NANOCON 2019 Conference Proeedings

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The use of nZVI is well known method for remediation of groundwater contaminated with chlorinated hydrocarbons. The present paper investigates the ability of traditional nZVI and S-nZVI modified with sulphide ion (HS -) to reduce CHC in real wastewater sample. In the effort to enhance longevity and efficiency of the treatment, experiments were performed under applied voltage (patent 304152, owner MEGA a.s., TUL). Results showed elevated reactivity of nZVI in reactors with passing voltage. The decomposition of the CHC in DC supported reactors occurred several times faster than in reactors without added voltage. However, the analysis of products suggests different pathway of decomposition when S-nZVI is used. The main product of reductive dechlorination was acetylene as opposite to regular nZVI which produced predominantly ethene and ethane. The nZVI provided with DC showed the most rapid decline of all contaminants in the time frame of 5 days.

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“…Nanowire-assisted disinfection water treatment technology [8] was introduced when nanotechnology was combined with a field enhancement treatment. In the application of field-enhanced nanoparticles in groundwater treatment [9], when a DC voltage is applied to wastewater that is rich in special particles, the degree of aggregation of nano-particles is lower, which increases the interactions between nano-particles and silicon dioxide and improves the reactivity and persistence of nano-particles, depending on the characteristics of the distribution of the local electric field between nano-particles and the interactions between nano-particles under an electric field.…”

Section: Introductionmentioning

confidence: 99%

A Novel Mutual-Coupling Dipole Model Considering the Interactions between Particles

Kang

Zhang²,

Shi³

et al. 2022

Coatings

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The interactions between two or more particles and the calculation of the local electric field are widely applied in many fields, such as those of insulation, biology, medicine, and microfluidics. The dipole approximation model, which is a classical electric field calculation method, has been widely used in many fields to solve for the local electric field in a multi-particle system, but it does not consider the interactions between particles; as a result, it is easily limited by the calculation situation, and it generates a large calculation error when the distance between particles is small. Based on the physical essence of an interaction between two particles, a concept of the mutual-coupling dipole moment caused by the interactions between particles is defined for the first time. Moreover, by combining the calculation process of the dipole moment and the electric field of polarization, a novel mutual-coupling dipole model considering the interactions between particles is proposed in this paper, and analytical expressions of the local electric field that consider the interaction between two particles are obtained, thus compensating for the large error in the electric field calculation caused by the dipole approximation model when the distance between particles is small. In this paper, a mutual-coupling dipole model considering particle interactions is proposed. This model can effectively reflect the interactions between particles when the distance between particles D/R is less than 0.6 and accurately calculate the local electric fields of the particles. These results can be effectively used to investigate the interactions between particles and the control of particles in electric fields in many fields, such as in the calculation of the insulation of mixed dielectrics, the microscopic transport of medicines, the control of bio-cells and micro-fluids in electric fields, and environmental governance.

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Electric-field enhanced reactivity and migration of iron nanoparticles with implications for groundwater treatment technologies: Proof of concept

Cited by 24 publications

References 39 publications

Cost-Effective Remediation Using Microscale Zvi: Comparison of Commercially Available Products

Cost-Effective Remediation Using Microscale Zvi: Comparison of Commercially Available Products

LABORATORY COMPARISON OF nZVI / S-nZVI EFFICIENCY IN SYSTEMS WITH AND WITHOUT POWER

A Novel Mutual-Coupling Dipole Model Considering the Interactions between Particles

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