Characterization of Phosphate Sequestration by a Lanthanum Modified Bentonite Clay: A Solid-State NMR, EXAFS, and PXRD Study
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| Title: | Characterization of Phosphate Sequestration by a Lanthanum Modified Bentonite Clay: A Solid-State NMR, EXAFS, and PXRD Study |
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| Authors: | Dithmer, Line, Lipton, Andrew S, Reitzel, Kasper, Warner, Terence Edwin, Lundberg, Daniel, Nielsen, Ulla Gro |
| Source: | Dithmer, L, Lipton, A S, Reitzel, K, Warner, T E, Lundberg, D & Nielsen, U G 2015, ' Characterization of phosphate sequestration by a lanthanum modified bentonite clay: A solid-state NMR, EXAFS and PXRD study ', Environmental Science & Technology (Washington), vol. 49, no. 7, pp. 4559-4566 . https://doi.org/10.1021/es506182s |
| Publisher Information: | American Chemical Society (ACS), 2015. |
| Publication Year: | 2015 |
| Subject Terms: | Magnetic Resonance Spectroscopy, Lakes/chemistry, Aluminum Silicates/chemistry, Lanthanum/chemistry, Bentonite/chemistry, 02 engineering and technology, Eutrophication, 01 natural sciences, Phosphates, Lakes, X-Ray Absorption Spectroscopy, X-Ray Diffraction, Lanthanum, Phosphates/chemistry, Bentonite, Clay, Aluminum Silicates, Adsorption, 0210 nano-technology, Environmental Restoration and Remediation, 0105 earth and related environmental sciences |
| Description: | 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. |
| Document Type: | Article |
| Language: | English |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/es506182s |
| Access URL: | https://pubmed.ncbi.nlm.nih.gov/25747941 https://pubs.acs.org/doi/pdf/10.1021/es506182s https://pubs.acs.org/doi/10.1021/es506182s https://core.ac.uk/display/50704027 http://www.osti.gov/scitech/biblio/1182872-characterization-phosphate-sequestration-lanthanum-modified-bentonite-clay-solid-state-nmr-exafs-pxrd-study https://jglobal.jst.go.jp/detail?JGLOBAL_ID=201502234531699866 https://portal.findresearcher.sdu.dk/da/publications/characterization-of-phosphate-sequestration-by-a-lanthanum-modifi-2 http://pubs.acs.org/doi/abs/10.1021/es506182s https://portal.findresearcher.sdu.dk/da/publications/6f4668cd-2a8c-4e20-b39a-f218433760fe https://doi.org/10.1021/es506182s |
| Accession Number: | edsair.doi.dedup.....09a938847bab696d35fdcc764e278e63 |
| Database: | OpenAIRE |
Nájsť tento článok vo Web of Science | 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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| ISSN: | 15205851 0013936X |
| DOI: | 10.1021/es506182s |