期刊
APPLIED CLAY SCIENCE
卷 205, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.clay.2021.106063
关键词
Thallium; Tl L-III-edge XANES; Adsorption mechanism; Adsorption hysteresis; Clay minerals
资金
- Ministry of Science and Technology, Taiwan
- MOST [106-2313-B-002-017-MY3, MOST 1092313B002048MY3]
- National Taiwan University, Taiwan [108 L891403, 109 L891303]
Thallium (Tl) is a highly toxic environmental contaminant, and its adsorption and desorption in soil are influenced by various soil components, showing a certain degree of reversibility. The type and content of clay minerals and exchangeable cations in soils play a significant role in the adsorption and reversibility of Tl(I).
Thallium (Tl) is a highly toxic environmental contaminant. To understand the mechanism controlling the mobility and availability of Tl in soil, the adsorption and desorption of Tl(I) were evaluated for six soils. The maximum Tl adsorption capacities of the soils ranged from 6.9 to 244.5 mmol kg(-1). The corresponding Tl LIIIedge X-ray absorption near-edge structure (XANES) data revealed that illite, vermiculite, and smectite are the preferential soil constituents for adsorbing Tl(I). Tl(I) adsorption by the soils was reversible in the low Tl adsorption regime and exhibited various degrees of hysteresis as the amount of absorbed Tl increased. The Tl(I) adsorption and extent of adsorption reversibility were mainly dependent on the type and content of clay minerals and exchangeable cations in different soils. Despite high Tl(I) adsorption by the soils, the reversibility of Tl(I) adsorption may result in relatively high mobility and availability of Tl(I) in soils, leading to high environmental risk. Ignoring the reversibility of Tl adsorption could lead to an erroneous prediction of the mobility and availability of Tl in soils and a significant underestimation of the environmental risk posed by Tl in the environment.
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