Comparative analysis of ZVI materials for reductive separation of 99Tc(VII) from aqueous waste streams

Boglaienko, Daria; Emerson, Hilary P.; Katsenovich, Yelena; Levitskaia, Tatiana G.

doi:10.1016/j.jhazmat.2019.120836

Cited by 28 publications

(27 citation statements)

References 40 publications

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“…This means that researchers have not even tried to characterize granular materials (mm in size) before manufacturing granular bimetallics and nano-scale materials [30,50]. On the contrary, reactivity testing is continued with species as toxic as 99 Tc VII [61].…”

Section: Methodsmentioning

confidence: 99%

Redirecting Research on Fe0 for Environmental Remediation: The Search for Synergy

Hu¹,

Noubactep²

2019

IJERPH

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A survey of the literature on using metallic iron (Fe0) for environmental remediation suggests that the time is ripe to center research on the basic relationship between iron corrosion and contaminant removal. This communication identifies the main problem, which is based on the consideration that contaminant reductive transformation is the cathodic reaction of iron oxidative dissolution. Properly considering the inherent complexities of the Fe0/H2O system will favor an appropriate research design that will enable more efficient and sustainable remediation systems. Successful applications of Fe0/H2O systems require the collective consideration of progress achieved in understanding these systems. More efforts should be made to decipher the long-term kinetics of iron corrosion, so as to provide better approaches to accurately predict the performance of the next generation Fe0-based water treatment systems.

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Section: Methodsmentioning

confidence: 99%

Redirecting Research on Fe0 for Environmental Remediation: The Search for Synergy

Hu¹,

Noubactep²

2019

IJERPH

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“…In literature, surface bound Fe(II) has been seen as a more effective reductant than Fe(II) oxides or an aqueous Fe 2+ and this could be possible also for Sb(III). [13,53,54] Hence, the electrostatic attraction and spontaneous reduction of TcO 4 to Tc(IV) can together be responsible for the efficient Tc uptake. The separation efficiency decreases above pH 6 since the redox potential decreases along the rising pH and thereby lowering the uptake capability.…”

Section: Betmentioning

confidence: 99%

“…[4,5] However, performances of ion exchange resins and adsorbents often suffer from the presence of other ions, and organic resins are prone to radiation damage. [6] For that reason, several inorganic materials have been developed for more selective removal of TcO 4 and ReO 4 such as mesoporous alumina, [7] metalorganic frameworks, [8,9,10,11] zero valent iron (ZVI), [12,13] Fe 2 O 3 and Fe 3 O 4 [12] and zirconium dioxide nanoparticles anchored onto reduced graphene oxide (ZrO 2 @rGO). [14] In addition, universal nonselective sorbent materials including activated carbon have been utilized in TcO 4 removal.…”

Section: Introductionmentioning

confidence: 99%

Sb-doped zirconium dioxide submicron fibers for separation of pertechnetate (TcO₄^–) from aqueous solutions

Lönnrot

Paajanen

Suorsa

et al. 2020

Separation Science and Technology

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Submicron ZrO 2 fibers with three different Sb-doping levels (5, 10 and 15 cation%) were produced with an electroblowing synthesis for removal of 99 TcO 4-. The Sb-doped ZrO 2 fibers showed high selectivity toward 99 TcO 4-, which was not interfered by ClO 4-, NO 3 or Clions and showed no selectivity toward ReO 4-. The optimal pH range for the 99 Tc separation was 2-6 but the Sb-doped fibers maintained very high uptake level throughout the studied pH range of 1-10. According to the uptake experiments, Sb(III) is assumed to reduce Tc(VII) to Tc(IV) that is then adsorbed by the zirconia surface.

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“…In order to separate radioactive heavy metal ions from aqueous waste streams, there are a number of techniques that can be used, including ion exchange, co-precipitation, and coagulation methods; selective membranes; as well as the use of nano-adsorbents or organic conjugate materials [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The use of ion exchange media is perhaps the commonly used technique in the nuclear industry, due to the high specific decontamination factors, low production of secondary wastes, reliability, and cost effectiveness [8,9,16,20].…”

Section: Introductionmentioning

confidence: 99%

Kinetic Studies of Cs+ and Sr2+ Ion Exchange Using Clinoptilolite in Static Columns and an Agitated Tubular Reactor (ATR)

et al. 2021

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Natural clinoptilolite was studied to assess its performance in removing caesium and strontium ions, using both static columns and an agitated tube reactor (ATR) for process intensification. Kinetic breakthrough curves were fitted using the Thomas and Modified Dose Response (MDR) models. In the static columns, the clinoptilolite adsorption capacity (qe) for 200 ppm ion concentrations was found to be ~171 and 16 mg/g for caesium and strontium, respectively, highlighting the poor material ability to exchange strontium. Reducing the concentration of strontium to 100 ppm, however, led to a higher strontium qe of ~48 mg/g (close to the maximum adsorption capacity). Conversely, halving the column residence time to 15 min decreased the qe for 100 ppm strontium solutions to 13–14 mg/g. All the kinetic breakthrough data correlated well with the maximum adsorption capacities found in previous batch studies, where, in particular, the influence of concentration on the slow uptake kinetics of strontium was evidenced. For the ATR studies, two column lengths were investigated (of 25 and 34 cm) with the clinoptilolite embedded directly into the agitator bar. The 34 cm-length system significantly outperformed the static vertical columns, where the adsorption capacity and breakthrough time were enhanced by ~30%, which was assumed to be due to the heightened kinetics from shear mixing. Critically, the increase in performance was achieved with a relative process flow rate over twice that of the static columns.

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Comparative analysis of ZVI materials for reductive separation of 99Tc(VII) from aqueous waste streams

Cited by 28 publications

References 40 publications

Redirecting Research on Fe0 for Environmental Remediation: The Search for Synergy

Redirecting Research on Fe0 for Environmental Remediation: The Search for Synergy

Sb-doped zirconium dioxide submicron fibers for separation of pertechnetate (TcO₄^–) from aqueous solutions

Kinetic Studies of Cs+ and Sr2+ Ion Exchange Using Clinoptilolite in Static Columns and an Agitated Tubular Reactor (ATR)

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Comparative analysis of ZVI materials for reductive separation of 99Tc(VII) from aqueous waste streams

Cited by 28 publications

References 40 publications

Redirecting Research on Fe0 for Environmental Remediation: The Search for Synergy

Redirecting Research on Fe0 for Environmental Remediation: The Search for Synergy

Sb-doped zirconium dioxide submicron fibers for separation of pertechnetate (TcO4–) from aqueous solutions

Kinetic Studies of Cs+ and Sr2+ Ion Exchange Using Clinoptilolite in Static Columns and an Agitated Tubular Reactor (ATR)

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Product

Resources

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Sb-doped zirconium dioxide submicron fibers for separation of pertechnetate (TcO₄^–) from aqueous solutions