Environmental Remediation with Functional Aerogels and Xerogels

Riley, Brian J.; Chong, Saehwa

doi:10.1002/gch2.202000013

Environmental Remediation with Functional Aerogels and Xerogels

Journal Article · Wed Jun 17 00:00:00 EDT 2020 · Global Challenges

DOI:https://doi.org/10.1002/gch2.202000013· OSTI ID:1633707

^[1]; Chong, Saehwa ^[1]

Pacific Northwest National Laboratory 902 Battelle Blvd Richland WA 99352 USA

Abstract

Several different types of aerogels and xerogels are demonstrated as effective sorbents for the capture and/or immobilization of radionuclides and other contaminants in gaseous form [e.g., Hg _(g) , I _2(g) , Xe, Kr] as well as ionic form (e.g., Cd ²⁺ , Ce ⁴⁺ , Cs ⁺ , Cu ²⁺ , Fe ²⁺ , Hg ²⁺ , I ⁻ , IO ₃ ⁻ , Kr, Pb ²⁺ , Rb ⁺ , Sr ²⁺ , ⁹⁹ Tc ⁷⁺ , U ⁶⁺ , Zn ²⁺ ). These sorbents have unique properties, which include high specific surface areas, high pore volumes, a range of pore sizes, and functionalities that provide methods for binding radionuclides and other contaminants, generally through physisorption, chemisorption, or a combination thereof. This combination of properties and functionalities makes these types of materials ideal for use as sorbents for capturing radionuclides. The primary base materials that will be discussed in this paper include Ag ⁰ ‐functionalized silica aerogels, Ag ⁺ ‐impregnated aluminosilicate aerogels, Ag ⁰ ‐functionalized aluminosilicate aerogels, metal‐impregnated (non‐Ag) aluminosilicate aerogels and xerogels, sulfide‐based aerogels, and carbon‐based aerogel composites. For the capture of I _2(g) , the materials reported herein show some of the highest iodine loadings ever reported for inorganic sorbents. For the capture of ionic species, these materials also show promise as next‐generation materials for active radionuclide remediation. This progress report describes materials fabrication, general properties, and environmental remediation applications.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; AC05-76RL01830

OSTI ID:: 1633707

Alternate ID(s):: OSTI ID: 1633708
OSTI ID: 1638779

Journal Information:: Global Challenges, Journal Name: Global Challenges Journal Issue: 10 Vol. 4; ISSN 2056-6646

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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