Cleanup of Hydrochloric ACID Waste Streams from Actinide Processes Using Extraction Chromatography

Schulte, Louis D.; Fitzpatrick, J.; Salazar, Richard R.; Schake, Bradley S.; Martinez, B.

doi:10.1080/01496399508010379

Cited by 11 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These variables include better defining the role of the phase transfer catalysts, the impact of metal contaminants present in solution on 241 Am extraction, extraction capacity for the CMPO , and DGA , extraction resins, etc. This study, and those preceding in the literature, ,,,,− ,− will hopefully inspire innovative research in the future that improves our general understanding of extraction chromatography. If successful, further optimizing large-scale separations for 241 Am recovery, and for processing other important analytes, will be more easily realized.…”

Section: Discussionmentioning

confidence: 70%

“…Surveying the literature revealed that others have observed similar performance from CMPO-based resins. 46,47 Often, this bimodal dependence of 241 Am K d values on HCl concentrations is attributed to hydrolysis of the m-CMPO phosphorous groups. 48 Intrigued by this phenomenon, we are mobilizing to further evaluate m-CMPO TBP , m-CMPO DAAP , and RE resin interactions with Am 3+ using macroscopic quantities of 241 Am and diagnostic spectroscopic methods.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

See 1 more Smart Citation

Characterizing Extraction Chromatography for Large-Scale Americium-241 Processing

Arko

Dan

Adelman

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The americium-241 ( 241 Am) radioisotope has valuable nuclear properties that find broad industrial usage. Ensuring stable supplies of 241 Am is critical for supporting (and expanding) the existing 241 Am-application space and enabling emerging 241 Amtechnologies that are important for economic growth, energy, and national security. Unfortunately, the United States halted 241 Am production in 1984 and the existing inventory was depleted in the early 2000s. This situation recently changed when the U.S. Department of Energy Isotope Program established 241 Am recovery at Los Alamos National Laboratory. Today, large-scale quantities of 241 Am are now obtained using the Chloride Extraction and Actinide Recovery (CLEAR) process. This method uses a resin that has the di-(4-t-butylphenyl)-N,N-di-iso-butylcarbamoylmethylphosphine oxide (m-CMPO) extractant adsorbed on a resin bead to harvest 241 Am from plutonium-containing waste streams. To maintain and improve CLEAR processing of 241 Am, we have evaluated the extraction of 241 Am by m-CMPO as a function of three important processing relevant variables: (1) HCl concentration, (2) metal contaminant concentration, and (3) contact time. The performance of the m-CMPO resin was additionally compared against commercially available resins, namely, rare earth (RE) resin and a selected series of diglycolamide (DGA) resins. Our results suggested that the m-CMPO resin outperformed most of the commercially available alternatives. However, tetraoctyl-DGA (TODGA) and tetraethyl-hexyl-DGA (TEHDGA) prevailed on several fronts. The TODGA and TEHDGA resins quantitatively released 241 Am at low HCl concentrations (<0.5 M), were less susceptible to deleterious side effects from metal contaminants in the mobile phase and bound 241 Am faster. Based on these results, we concluded that 241 Am recovery yields have the potential to improve if TODGA or TEHDGA is used in place of m-CMPO for large-scale CLEAR processing of 241 Am.

show abstract

Section: Discussionmentioning

confidence: 70%

Section: ■ Results and Discussionmentioning

confidence: 98%

Characterizing Extraction Chromatography for Large-Scale Americium-241 Processing

Arko

Dan

Adelman

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Although the origin for this disparate performance remains unclear, it has been observed and discussed previously. 36,37 The general line shapes that described 243 Am (aq) K d dependence in HCl (aq) from the 'veteran' resins were similar to one another and to that from 'pristine' m-CMPO TBP resins. Despite these similarities, some subtle and important distinctions should be noted.…”

Section: Distribution Coefficients (K D ) From M-cmpo Tbp 'Veteran' A...mentioning

confidence: 72%

“…Although the origin for this disparate performance remains unclear, it has been observed and discussed previously. 36,37…”

Section: Resultsmentioning

confidence: 99%

Exploring how exposure to radiolysis and harsh chemical reagents impact americium-241 extraction chromatography

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Photoelectrooxidation of chloride ions to chlorine (Eq. 2) accompanied by water reduction at the cathode to produce H 2 , could provide an attractive, cost-effective alternative to water oxidation [8][9][10] .…”

mentioning

confidence: 99%

Nanostructured bismuth vanadate/tungsten oxide photoanode for chlorine production with hydrogen generation at the dark cathode

et al. 2019

View full text Add to dashboard Cite

Photoelectrooxidation of chloride ions to chlorine with co-production of hydrogen by water reduction has been proposed as a means of decreasing the net solar hydrogen production cost. So far, however, most such solar-to-chlorine production systems use cost-prohibitive materials and/or show rather small faradaic yield or stability. Here we report the development of earth-abundant, nanostructured bismuth vanadate/tungsten oxide (BiVO 4 /WO 3 ) photoanode assemblies that operate in acidic sodium chloride solution (pH 1; 4 M) to produce chlorine while generating hydrogen at the dark cathode. We show that electrodeposition of 20 nm WO 3 coating protects BiVO 4 from harsh pH and oxidative environments while being catalytically active for chlorine evolution. The heterostructured BiVO 4 /WO 3 photoanodes yield average photocurrent densities of 2.5 ± 0.3 mA cm −2 at 1.42 V RHE (Reversible Hydrogen Electrode) under 1 sun illumination. After two hours of continuous illumination, the best performing devices demonstrate faradaic efficiencies of 85% for chlorine production and 100% for hydrogen production.

show abstract

Cleanup of Hydrochloric ACID Waste Streams from Actinide Processes Using Extraction Chromatography

Cited by 11 publications

References 5 publications

Characterizing Extraction Chromatography for Large-Scale Americium-241 Processing

Characterizing Extraction Chromatography for Large-Scale Americium-241 Processing

Exploring how exposure to radiolysis and harsh chemical reagents impact americium-241 extraction chromatography

Nanostructured bismuth vanadate/tungsten oxide photoanode for chlorine production with hydrogen generation at the dark cathode

Contact Info

Product

Resources

About