Removal of CrO42-, a Nonradioactive Surrogate of 99TcO4-, Using LDH-Mo3S13 Nanosheets

被引：22

作者：

Celik, Ahmet ^{[1
]}

Li, Dien ^{[2
]}

Quintero, Michael A. ^{[3
]}

Taylor-Pashow, Kathryn M. L. ^{[2
]}

Zhu, Xianchun ^{[4
]}

Shakouri, Mohsen ^{[5
]}

Roy, Subrata Chandra ^{[1
]}

Kanatzidis, Mercouri G. ^{[3
]}

Arslan, Zikri ^{[1
]}

Blanton, Alicia ^{[1
]}

Nie, Jing ^{[1
]}

Ma, Shulan ^{[6
]}

Han, Fengxiang X. ^{[1
]}

Islam, Saiful M. ^{[1
]}

机构：

[1] Jackson State Univ, Dept Chem Phys & Atmospher Sci, Jackson, MS 39217 USA

[2] Savannah River Natl Lab, Aiken, SC 29808 USA

[3] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA

[4] Jackson State Univ, Dept Civil Engn, Jackson, MS 39217 USA

[5] Canadian Light Source, Saskatoon, SK S7N 0X4, Canada

[6] Beijing Normal Univ, Coll Chem, Beijing 100875, Peoples R China

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2022年 / 56卷 / 12期

基金：

加拿大创新基金会; 加拿大健康研究院; 加拿大自然科学与工程研究理事会;

关键词：

nuclear waste; pertechnetate; chromate; low activity waste; off-gas condensate stream; Hanford's radioactive waste; RAY-ABSORPTION SPECTROSCOPY; HEXAVALENT CHROMIUM; ADSORPTION; EFFICIENT; CAPTURE; WASTE; SOLUBILITY; TECHNETIUM; IMMOBILIZATION; HYDROXIDES;

D O I：

10.1021/acs.est.1c08766

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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 [(Mo3S13)-S-IV](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-Mo3S13 removes CrO42- from the LAW condensate stream, having a pH of 7.5, from ppm (similar to 9.086 X 10(4) ppb of Cr6+) to below 1 ppb levels with distribution constant (K-d) values of up to similar to 10(7) mL/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.

引用

页码：8590 / 8598

页数：9

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