Iron-Tuned Depth-Dependent P Transformation on Calcium Carbonate Coprecipitates: The Impact of Fe and P Loadings
文献类型： 外文期刊
作者： Liu, Jin 1 ; Zhou, Junfeng 1 ; Sun, Meili 2 ; Zhu, Mengqiang 3 ; Zhao, Yuhang 1 ; Xu, Jun 1 ; Chen, Tianwen 1 ; Shakouri, Mohsen 4 ; Zheng, Lei 5 ; Sui, Peng 1 ; Chen, Yuanquan 1 ; Yang, Jianjun 2 ;
作者机构： 1.China Agr Univ, Coll Agron & Biotechnol, Beijing 100094, Peoples R China
2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, State Key Lab Efficient Utilizat Arable Land China, Beijing 100081, Peoples R China
3.Univ Maryland, Dept Geol, College Pk, MD 20742 USA
4.Univ Saskatchewan, Canadian Light Source Inc, Saskatoon, SK S7N 2V3, Canada
5.Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China
关键词： molecular speciation; X-ray absorption spectroscopy; phosphorus bioavailability; surface precipitation; nucleation
期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY （ 影响因子：11.3； 五年影响因子：12.4 ）
ISSN： 0013-936X
年卷期： 2025 年 59 卷 29 期
页码：
收录情况： SCI
摘要： The incorporation of iron (Fe) into calcium carbonate coprecipitates (CCCs) to form Fe-incorporated CCC (CCCFe) widely occurred in CCC-enriched soils and sediments. However, the molecular mechanism of phosphate (P) immobilization on CCCFe remains largely unknown. In this study, batch experiments were conducted to investigate the immobilization mechanisms of P on CCCFe with low and high Fe loadings (CCCFel vs CCCFeh) using P K-edge X-ray absorption near-edge structure (XANES) spectroscopy with surface-sensitive total electron yield (P-XANESTEY) and bulk-sensitive fluorescence yield (P-XANESFLY) modes. Results indicated that the high Fe loading inhibited calcite formation but favored vaterite production in the CCC and enhanced its P retention capacity. Hydroxyapatite (HAP) dominated over ferrihydrite-associated P (Fe-P) in the bulk of P sorbed on the CCCFeh, but amorphous calcium phosphate (ACP) dominated over HAP for the CCC, suggesting Fe-induced transformation of the ACP to the HAP. Furthermore, the P-XANESTEY analysis indicated brushite primarily formed on the surface of the P sorbed on the CCCFeh at high P loading. Consistently, the spherical aberration-corrected scanning transmission electron microscopy analysis directly revealed ferrihydrite coating on the CCC and the presence of Ca-P and Fe-P associations. This study provides new molecular-level insights into Fe-tuned depth-dependent transformation of P on the CCC, thus benefiting P management in the CCC-enriched environmental settings.
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