Characterization of phosphate sequestration by a lanthanum modified bentonite clay: a solid-state NMR, EXAFS, and PXRD study

Environmental Science & Technology
Line DithmerUlla Gro Nielsen

Abstract

Phosphate (Pi) sequestration by a lanthanum (La) exchanged clay mineral (La-Bentonite), which is extensively used in chemical lake restoration, was investigated on the molecular level using a combination of (31)P and (139)La solid state NMR spectroscopy (SSNMR), extended X-ray absorption spectroscopy (EXAFS), powder X-ray diffraction (PXRD) and sorption studies. (31)P SSNMR show that all Pi was immobilized as rhabdophane (LaPO4·n H2O, n ≤ 3), which was further supported by (139)La SSNMR and EXAFS. However, PXRD results were ambiguous with respect to rhabdophane and monazite (LaPO4). Adsorption studies showed that at dissolved organic carbon (DOC) concentration above ca. 250 μM the binding capacity was only 50% of the theoretical value or even less. No other La or Pi phases were detected by SSNMR and EXAFS indicating the effect of DOC is kinetic. Moreover, (31)P SSNMR showed that rhabdophane formed upon Pi sequestration is in close proximity to the clay matrix.

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Citations

Mar 28, 2016·The Science of the Total Environment·Changhui WangHuacheng Xu
Oct 8, 2019·Journal of Environmental Quality·Lipeng WuXiaodong Ding
Sep 1, 2020·Environmental Science and Pollution Research International·Jingzhen CuiPengling Shi
Jul 30, 2020·Environmental Science and Pollution Research International·Yulong WangYongfeng Jia
May 11, 2017·Environmental Science and Pollution Research International·Eyal KurzbaumOded Bar Shalom
Dec 1, 2017·Environmental Science and Pollution Research International·West M Bishop, Robert J Richardson
Nov 16, 2019·Chemosphere·Geert J BehetsPatrick C D'Haese
Jan 12, 2021·Environmental Research·Jingwan HuoYin Wang
Feb 22, 2021·Environmental Pollution·Xiaodi LiDeyi Wu
Mar 12, 2021·Journal of Environmental Management·Yunli LiuYi Zhang
Dec 22, 2020·Environmental Science & Technology·Yanyang ZhangBingcai Pan
Aug 25, 2021·Chemosphere·Anitha KunhikrishnanChengrong Chen
Oct 16, 2021·Environmental Science and Pollution Research International·Yichao WangZhenming Zhou
Jul 4, 2021·Environmental Science and Pollution Research International·Haijing DuanYangyang Wang
Dec 8, 2021·The Science of the Total Environment·Juan LinMusong Chen

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