Evaluation of materials for iodine and technetium immobilization through sorption and redox-driven processes

Pearce, Carolyn I.; Cordova, Elsa A.; Garcia, Whitney L.; Saslow, Sarah A.; Cantrell, Kirk J.; Morad, Joseph W; Qafoku, Odeta; Matyáš, Josef; Plymale, Andrew E.; Chatterjee, Sayandev; Kang, Jaehyuk; Colon, Ferdinan Cintron; Rigali, Mark J.; Szecsody, Jim E.; Heald, Steve M.; Balasubramanian, Mahalingam; Wang, Shuao; Sun, Daniel T.; Queen, Wendy L.; Bontchev, Ranko P.; Moore, R. L.; Freedman, Vicky L.

doi:10.1016/j.scitotenv.2019.136167

Cited by 17 publications

(34 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The small crystallites of bismuth oxyhydroxide aggregate into layered structures, and these layered structures aggregate into the 20–50 μm particles shown in Figure a and b. Previous work has shown that the layers expand upon contact with SGW and substitution of carbonate for nitrate . The bismuth subnitrate shows similarities to bismuth oxyhydroxide in terms of aggregate structure, but the lower magnification image (Figure c) reveals a range of other particle morphologies not representative of the layered structure aggregate.…”

Section: Resultsmentioning

confidence: 83%

“…Active sorbents were selected as high-performing materials based on the capacity for IO 3 – uptake, selectivity, and long-term performance . Bismuth oxyhydroxide (BIN) and freeze-dried ferrihydrite (FeH) were synthesized in the lab.…”

Section: Resultsmentioning

confidence: 99%

“…On the basis of the review by Moore et al, Pearce et al evaluated the performance of a subset of natural and engineered materials specifically for immobilization of iodate (IO 3 – ), the dominant species present in Hanford groundwater. − Twenty-five advanced materials were evaluated under the same experimental conditions for removal of IO 3 – from synthetic groundwater. In addition, cycled retention/release column experiments were used to demonstrate key factors for material performance under flow conditions with groundwater from the site.…”

Section: Introductionmentioning

confidence: 99%

“…A thorough review of potential 129 I remediation options was carried out to identify research needs for some of the more promising technologies that could be addressed in laboratory experiments. 15 On the basis of the review by Moore et al, 15 Pearce et al 18 evaluated the performance of a subset of natural and engineered materials specifically for immobilization of iodate (IO 3 − ), the dominant species present in Hanford groundwater. 19−21 Twenty-five advanced materials were evaluated under the same experimental conditions for removal of IO 3 − from synthetic groundwater.…”

Section: ■ Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Hybrid Sorbents for ¹²⁹I Capture from Contaminated Groundwater

Cordova

Garayburu‐Caruso

Pearce

et al. 2020

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Radioiodine (129I) poses a risk to the environment due to its long half-life, toxicity, and mobility. It is found at the U.S. Department of Energy Hanford Site due to legacy releases of nuclear wastes to the subsurface where 129I is predominantly present as iodate (IO3 –). To date, a cost-effective and scalable cleanup technology for 129I has not been identified, with hydraulic containment implemented as the remedial approach. Here, novel high-performing sorbents for 129I remediation with the capacity to reduce 129I concentrations to or below the US Environmental Protection Agency (EPA) drinking water standard and procedures to deploy them in an ex-situ pump and treat (P&T) system are introduced. This includes implementation of hybridized polyacrylonitrile (PAN) beads for ex-situ remediation of IO3 –-contaminated groundwater for the first time. Iron (Fe) oxyhydroxide and bismuth (Bi) oxyhydroxide sorbents were deployed on silica substrates or encapsulated in porous PAN beads. In addition, Fe–, cerium (Ce)–, and Bi–oxyhydroxides were encapsulated with anion-exchange resins. The PAN–bismuth oxyhydroxide and PAN–ferrihydrite composites along with Fe- and Ce-based hybrid anion-exchange resins performed well in batch sorption experiments with distribution coefficients for IO3 – of >1000 mL/g and rapid removal kinetics. Of the tested materials, the Ce-based hybrid anion-exchange resin was the most efficient for removal of IO3 – from Hanford groundwater in a column system, with 50% breakthrough occurring at 324 pore volumes. The functional amine groups on the parent resin and amount of active sorbent in the resin can be customized to improve the iodine loading capacity. These results highlight the potential for IO3 – remediation by hybrid sorbents and represent a benchmark for the implementation of commercially available materials to meet EPA standards for cleanup of 129I in a large-scale P&T system.

show abstract

Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hybrid Sorbents for ¹²⁹I Capture from Contaminated Groundwater

Cordova

Garayburu‐Caruso

Pearce

et al. 2020

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

“…Selected particulate amendments include two sizes of zero valent iron (ZVI) (granular [gZVI] and micron [mZVI]), sulfur modified iron (SMI), and bismuth sub-nitrate, wherein suspension combinations were evaluated for contaminant removal. Bismuth sub-nitrate was selected as a promising adsorbent material which consists of layered structures that effectively treat a variety of inorganic contaminant species and mixtures (Pearce et al, 2020). These studies incorporated chromate because it is a prevalent groundwater contaminant worldwide due to metals plating, textiles, wood preservation, and corrosion prevention (Testa et al, 2004;Gharbi et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Characterizing the Influence of Organic Polymers on the Specific Reactivity of Particulate Remedial Amendments

Muller

Zhong

Bagwell

2021

Front. Environ. Sci.

View full text Add to dashboard Cite

Commercially available particulate amendments demonstrate high reactivity for effective treatment of water soluble organic and inorganic contaminants in laboratory studies; however, transport of these particles is constrained in the subsurface. In many field applications, particulate amendments are mixed with organic polymers to enhance mobility for direct push applications or stabilize suspensions for high mass loadings. As such, the interactions between particulate amendments, organic polymers and contaminant species need to be systematically investigated to properly understand mechanistic processes that facilitate predictive performance metrics for specific applications in situ. In this study, batch experiments were conducted to quantify the effects of organic polymers (xanthan gum, guar gum, and sodium alginate), polymer concentration (800 and 4,000 mg/L), and aging (up to 28 days) on chromate treatment rate and capacity by two classes of amendments: reductants [granular zero-valent iron (gZVI), micron-ZVI (mZVI), sulfur modified iron (SMI)], and an adsorbent (bismuth sub-nitrate). When particulate amendments were suspended in polymer solutions, reductants retained between 84–100% of the amendment treatment capacity. Conversely, the adsorbent maintained 63–97% relative treatment capacity of the no-polymer control. Polymer solutions had a more pronounced impact on the rate of chromate removal; first order rates of chemical reduction decreased by as much as 70% and adsorption by up to 81% relative to the no-polymer controls. Polymer–amendment aging experiments also showed decreased Cr(VI) treatment capacity; reductants decreased by as much as 24% and adsorption decreased by as much as 44% after 28 days of incubation. While polymer suspensions are needed to aid the injection of particulate amendments into the subsurface, the results from this study indicate potential losses of treatment capacity and a decrease in the rate of remedial performance due to the physical and chemical interactions between polymer suspensions and reactive particulate amendments. Simple batch systems provide baseline characterization of tripartite interactions for the removal of Cr(VI). Additional work is needed to quantify the full impact of polymers on remedial outcomes under site relevant conditions at field scale.

show abstract

Pertechnetates – A Structural Study Across the Periodic Table

Strub,

Grödler,

Zaratti

et al. 2024

Chemistry A European J

View full text Add to dashboard Cite

The number of crystal structures of pertechnetates derived from aqueous solutions has been expanded from seven to over 30. We report the conversion of NH4TcO4 to aqueous HTcO4 via acidic cation exchange. This is followed by the synthesis and structural elucidation of pertechnetate salts of alkaline earth (AE), transition metal (TM) and lanthanoids (Ln) elements. Various degrees of hydration and coordination are discussed. Where possible, a comparison with the perrhenate homologues is made. The described syntheses and materials may be used as novel starting materials for extended technetium research.

show abstract

Evaluation of materials for iodine and technetium immobilization through sorption and redox-driven processes

Cited by 17 publications

References 10 publications

Hybrid Sorbents for ¹²⁹I Capture from Contaminated Groundwater

Hybrid Sorbents for ¹²⁹I Capture from Contaminated Groundwater

Characterizing the Influence of Organic Polymers on the Specific Reactivity of Particulate Remedial Amendments

Pertechnetates – A Structural Study Across the Periodic Table

Contact Info

Product

Resources

About

Evaluation of materials for iodine and technetium immobilization through sorption and redox-driven processes

Cited by 17 publications

References 10 publications

Hybrid Sorbents for 129I Capture from Contaminated Groundwater

Hybrid Sorbents for 129I Capture from Contaminated Groundwater

Characterizing the Influence of Organic Polymers on the Specific Reactivity of Particulate Remedial Amendments

Pertechnetates – A Structural Study Across the Periodic Table

Contact Info

Product

Resources

About

Hybrid Sorbents for ¹²⁹I Capture from Contaminated Groundwater

Hybrid Sorbents for ¹²⁹I Capture from Contaminated Groundwater