Removal of CrO42-, a Nonradioactive Surrogate of 99TcO4-, Using LDH-Mo3S13Nanosheets

Ahmet Celik, Dien Li, Michael A. Quintero, Kathryn M.L. Taylor-Pashow, Xianchun Zhu, Mohsen Shakouri, Subrata Chandra Roy, Mercouri G. Kanatzidis, Zikri Arslan, Alicia Blanton, Jing Nie, Shulan Ma, Fengxiang X. Han, Saiful M. Islam*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Removal of chromate (CrO42-) and pertechnetate (TcO4-) from the Hanford Low Activity Waste (LAW) is beneficial as it impacts the cost, life cycle, operational complexity of the Waste Treatment and Immobilization Plant (WTP), and integrity of vitrified glass for nuclear waste disposal. Here, we report the application of [MoIV3S13]2-intercalated layer double hydroxides (LDH-Mo3S13) for the removal of CrO42-as a surrogate for TcO4-, from ppm to ppb levels from water and a simulated LAW off-gas condensate of Hanford's WTP. LDH-Mo3S13removes CrO42-from the LAW condensate stream, having a pH of 7.5, from ppm (∼9.086 × 104ppb of Cr6+) to below 1 ppb levels with distribution constant (Kd) values of up to ∼107mL/g. Analysis of postadsorbed solids indicates that CrO42-removal mainly proceeds by reduction of Cr6+to Cr3+. This study sets the first example of a metal sulfide intercalated LDH for the removal of CrO42-, as relevant to TcO4-, from the simulated off-gas condensate streams of Hanford's LAW melter which contains highly concentrated competitive anions, namely F-, Cl-, CO32-, NO3-, BO33-, NO2-, SO42-, and B4O72-. LDH-Mo3S13's remarkable removal efficiency makes it a promising sorbent to remediate CrO42-/TcO4-from surface water and an off-gas condensate of nuclear waste.

Original languageEnglish (US)
Pages (from-to)8590-8598
Number of pages9
JournalEnvironmental Science and Technology
Issue number12
StatePublished - Jun 21 2022


  • Hanford's radioactive waste
  • chromate
  • low activity waste
  • nuclear waste
  • off-gas condensate stream
  • pertechnetate

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry


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