Hybrid Sorbents for 129I Capture from Contaminated Groundwater

被引：31

作者：

Cordova, Elsa A. ^{[1
]}

Garayburu-Caruso, Vanessa ^{[1
]}

Pearce, Carolyn, I ^{[1
]}

Cantrell, Kirk J. ^{[1
]}

Morad, Joseph W. ^{[1
]}

Gillispie, Elizabeth C. ^{[1
]}

Riley, Brian J. ^{[1
]}

Colon, Ferdinan Cintron ^{[1
]}

Levitskaia, Tatiana G. ^{[1
]}

Saslow, Sarah A. ^{[1
]}

Qafoku, Odeta ^{[1
]}

Resch, Charles T. ^{[1
]}

Rigali, Mark J. ^{[2
]}

Szecsody, Jim E. ^{[1
]}

Heald, Steve M. ^{[3
]}

Balasubramanian, Mahalingam ^{[3
]}

Meyers, Peter ^{[4
]}

Freedman, Vicky L. ^{[1
]}

机构：

[1] Pacific Northwest Natl Lab, Richland, WA 99352 USA

[2] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA

[3] Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA

[4] Resin Tech, West Berlin, NJ 08091 USA

来源：

ACS APPLIED MATERIALS & INTERFACES | 2020年 / 12卷 / 23期

关键词：

radioiodine; groundwater remediation; ion-exchange resins; polyacrylonitrile beads; silica substrates; bismuth oxyhydroxide; ferrihydrite; cerium oxide/oxyhydroxide; SAVANNA RIVER SITE; IODINE; SPECIATION; RADIOIODINE; SUBSURFACE; IMMOBILIZATION; TRANSPORT; COMPOSITE; BEHAVIOR;

D O I：

10.1021/acsami.0c01527

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Radioiodine (I-129) 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 I-129 is predominantly present as iodate (IO3-). To date, a cost-effective and scalable cleanup technology for I-129 has not been identified, with hydraulic containment implemented as the remedial approach. Here, novel high-performing sorbents for I-129 remediation with the capacity to reduce I-129 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 IO(3)(- )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 I-129 in a large-scale P&T system.

引用

页码：26113 / 26126

页数：14

共 36 条

[1]

Byrnes M. E., 2008, LIT SURVEY GROUNDWAT

[2]

Campbell E., 2018, PNNL28062, DOI [10.2172/1488863, DOI 10.2172/1488863]

[3] Cesium removal from solution using PAN-based potassium nickel hexacyanoferrate (II) composite spheres [J].