https://scholars.lib.ntu.edu.tw/handle/123456789/572732
標題: | Adsorption and desorption of Thallium(I) in soils: The predominant contribution by clay minerals | 作者: | Lin H.-Y Chuang T.-J Yang P.-T Guo L.-Y Wang S.-L. SHAN-LI WANG |
關鍵字: | Clay minerals; Desorption; Hysteresis; Soils; Thallium; X ray absorption; Adsorption and desorptions; Adsorption capacities; Adsorption hysteresis; Adsorption mechanism; Environmental contaminant; Environmental risks; Smectites; Structure data; Thallium LIII-edge X-ray absorption near-edge structure; X-ray absorption near-edge structure; Adsorption; adsorption; clay mineral; clay soil; desorption; mineral property; thallium; XANES spectroscopy | 公開日期: | 2021 | 卷: | 205 | 來源出版物: | Applied Clay Science | 摘要: | 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 LIII-edge 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. ? 2021 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85102628722&doi=10.1016%2fj.clay.2021.106063&partnerID=40&md5=d1ed144eb825b80c7a126130bdba289b https://scholars.lib.ntu.edu.tw/handle/123456789/572732 |
ISSN: | 1691317 | DOI: | 10.1016/j.clay.2021.106063 |
顯示於: | 農業化學系 |
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