Effect of phosphate on the sorption and fractionation of rare earth ions on kaolinite surface and its geochemical significance
文献类型：期刊论文
| 作者 | Zhou, Jingwen3,4; Liang, Xiaoliang3,4 ; Yu, Wenbin1,4; Lin, Xiaoju3,4; Wu, Puqiu3,4; Jiang, Yanhong3,4; Huang, Deyin2
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| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2024-03-20 |
| 卷号 | 648页码:9 |
| 关键词 | Rare earth elements Kaolinite Phosphate Sorption Fractionation Modeling |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2024.121976 |
| 英文摘要 | Kaolinite (Kln) is ubiquitous in weathering crust, rivers, groundwater, and oceans, and plays an important role in controlling the migration of rare earth elements (REEs). Phosphate forms strong complexes with REEs in aqueous environments, but it remains unclear whether phosphate influences the sorption and fractionation of REEs onto Kln. In this study, the characteristics of the sorption of phosphate, REEs, and phosphate plus REEs onto Kln and the mechanisms of these processes were investigated through batch sorption experiments and model-based computation. Under both weakly acidic and neutral conditions, the sorption isotherms of phosphate and REEs, respectively, were well fitted with a Langmuir model, suggesting that they underwent monolayer sorption onto Kln. The sorption capacity of Kln increased with pH. At pH 4.0, the sorption mechanism of phosphate involved electrostatic attraction and surface complexation, whereas that of REEs mainly involved electrostatic attraction without apparent fractionation. Although pre-sorption of phosphate generated more binding sites on Kln, most REEs were sorbed via electrostatic attraction, which did not affect the fractionation of REEs into light REEs (LREEs) and heavy REEs (HREEs). At pH 6.5, the sorption mechanism of phosphate was only surface complexation, whereas that of REEs involved electrostatic attraction and surface complexation, with slight fractionation. Pre-sorbed phosphate formed ternary surface complexes with REEs, thereby increasing sorption of HREEs, which had a greater complexation ability than LREEs. The above-described results account for the reported effect of phosphate on the enrichment and fractionation of REEs in the supergene environment, and thus improve our understanding of the transfer characteristics of REEs on Earth's surface. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001178936600001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77245]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Liang, Xiaoliang; Yu, Wenbin |
| 作者单位 | 1.Chinese Acad Sci, State Key Lab Ore Deposit Geochem, Inst Geochem, Guiyang 550081, Guizhou, Peoples R China 2.Guangdong Acad Sci, Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Integrated Agroenvironm Pollut C, Natl Reg Joint Engn Res Ctr Soil Pollut Control &, Guangzhou 510650, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat Res Dev, Guangzhou 510640, Guangdong, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou, Jingwen,Liang, Xiaoliang,Yu, Wenbin,et al. Effect of phosphate on the sorption and fractionation of rare earth ions on kaolinite surface and its geochemical significance[J]. CHEMICAL GEOLOGY,2024,648:9. |
| APA | Zhou, Jingwen.,Liang, Xiaoliang.,Yu, Wenbin.,Lin, Xiaoju.,Wu, Puqiu.,...&Huang, Deyin.(2024).Effect of phosphate on the sorption and fractionation of rare earth ions on kaolinite surface and its geochemical significance.CHEMICAL GEOLOGY,648,9. |
| MLA | Zhou, Jingwen,et al."Effect of phosphate on the sorption and fractionation of rare earth ions on kaolinite surface and its geochemical significance".CHEMICAL GEOLOGY 648(2024):9. |
入库方式： OAI收割
来源：广州地球化学研究所
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