Sequestration of the tributyl phosphate complex of europium nitrate in the clay hectorite. A 31P NMR study

C. J. Hartzell; S. W. Yang; R. A. Parnell; D. E. Morris

doi:10.1021/j100012a048

Sequestration of the tributyl phosphate complex of europium nitrate in the clay hectorite. A ³¹P NMR study

C. J. Hartzell, S. W. Yang, R. A. Parnell, D. E. Morris

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

The behaviour of organic complexes of actinides and lanthanides in clays plays an important role in environmental remediation. Application of ³¹P NMR to distinguish Eu(NO)₃)₃-complexed tributyl phosphate from uncomplexed tributyl phosphate (TBP) facilitates an understanding of the fate of these species in the clay hectorite. Solution ³¹P NMR studies show dramatic shifts of -156.0 to -172.9 ppm for Eu(NO₃)₃6H₂O dissolved in TBP at TBP:Eu ratios 1:1 to 1:2.5. Pure TBP exhibits ³¹P chemical shift of -0.3 ppm. Mixtures with higher TBP:Eu ratios display lines progressively downfield of -156.0 ppm, reflecting exchange of complexed and free TBP. The Eu(NO₃)₃-complexed TBP adsorbed into hectorite displays a ³¹P chemical shift of -180.7 to -193.8 ppm. Clays adsorbed with solutions that are 3.1, 5:1 and 7:1 TBP:Eu display peaks due to complex as well as peaks in the range -4 to -6 ppm attributed to uncomplexed TBP. No evidence of exchange is observed. Spectra of the TBP-adsorbed clay give a TBP line at -0.7 ppm which changes slightly to --5.0 after exchange with Eu(NO₃)₃. The Eu(NO₃)₃-exchanged hectorite displays a line at -17.6 ppm after adsorption of TBP. Neither of the latter two samples show indication of complex formation. The hectorite samples exposed to TBP or the complex display (001) d spacings of 17.9-18.4 A compared to 12.3-12.5 A for hectorite which has not been exposed to TBP.

Original language	English (US)
Pages (from-to)	4205-4210
Number of pages	6
Journal	Journal of physical chemistry
Volume	99
Issue number	12
DOIs	https://doi.org/10.1021/j100012a048
State	Published - 1995

ASJC Scopus subject areas

General Engineering
Physical and Theoretical Chemistry

Access to Document

10.1021/j100012a048

Cite this

@article{70fbf6cc1cc14e12b9a4d635d96aae35,

title = "Sequestration of the tributyl phosphate complex of europium nitrate in the clay hectorite. A 31P NMR study",

abstract = "The behaviour of organic complexes of actinides and lanthanides in clays plays an important role in environmental remediation. Application of 31P NMR to distinguish Eu(NO)3)3-complexed tributyl phosphate from uncomplexed tributyl phosphate (TBP) facilitates an understanding of the fate of these species in the clay hectorite. Solution 31P NMR studies show dramatic shifts of -156.0 to -172.9 ppm for Eu(NO3)36H2O dissolved in TBP at TBP:Eu ratios 1:1 to 1:2.5. Pure TBP exhibits 31P chemical shift of -0.3 ppm. Mixtures with higher TBP:Eu ratios display lines progressively downfield of -156.0 ppm, reflecting exchange of complexed and free TBP. The Eu(NO3)3-complexed TBP adsorbed into hectorite displays a 31P chemical shift of -180.7 to -193.8 ppm. Clays adsorbed with solutions that are 3.1, 5:1 and 7:1 TBP:Eu display peaks due to complex as well as peaks in the range -4 to -6 ppm attributed to uncomplexed TBP. No evidence of exchange is observed. Spectra of the TBP-adsorbed clay give a TBP line at -0.7 ppm which changes slightly to --5.0 after exchange with Eu(NO3)3. The Eu(NO3)3-exchanged hectorite displays a line at -17.6 ppm after adsorption of TBP. Neither of the latter two samples show indication of complex formation. The hectorite samples exposed to TBP or the complex display (001) d spacings of 17.9-18.4 A compared to 12.3-12.5 A for hectorite which has not been exposed to TBP.",

author = "Hartzell, {C. J.} and Yang, {S. W.} and Parnell, {R. A.} and Morris, {D. E.}",

year = "1995",

doi = "10.1021/j100012a048",

language = "English (US)",

volume = "99",

pages = "4205--4210",

journal = "Journal of physical chemistry",

issn = "0022-3654",

publisher = "American Chemical Society",

number = "12",

}

TY - JOUR

T1 - Sequestration of the tributyl phosphate complex of europium nitrate in the clay hectorite. A 31P NMR study

AU - Hartzell, C. J.

AU - Yang, S. W.

AU - Parnell, R. A.

AU - Morris, D. E.

PY - 1995

Y1 - 1995

N2 - The behaviour of organic complexes of actinides and lanthanides in clays plays an important role in environmental remediation. Application of 31P NMR to distinguish Eu(NO)3)3-complexed tributyl phosphate from uncomplexed tributyl phosphate (TBP) facilitates an understanding of the fate of these species in the clay hectorite. Solution 31P NMR studies show dramatic shifts of -156.0 to -172.9 ppm for Eu(NO3)36H2O dissolved in TBP at TBP:Eu ratios 1:1 to 1:2.5. Pure TBP exhibits 31P chemical shift of -0.3 ppm. Mixtures with higher TBP:Eu ratios display lines progressively downfield of -156.0 ppm, reflecting exchange of complexed and free TBP. The Eu(NO3)3-complexed TBP adsorbed into hectorite displays a 31P chemical shift of -180.7 to -193.8 ppm. Clays adsorbed with solutions that are 3.1, 5:1 and 7:1 TBP:Eu display peaks due to complex as well as peaks in the range -4 to -6 ppm attributed to uncomplexed TBP. No evidence of exchange is observed. Spectra of the TBP-adsorbed clay give a TBP line at -0.7 ppm which changes slightly to --5.0 after exchange with Eu(NO3)3. The Eu(NO3)3-exchanged hectorite displays a line at -17.6 ppm after adsorption of TBP. Neither of the latter two samples show indication of complex formation. The hectorite samples exposed to TBP or the complex display (001) d spacings of 17.9-18.4 A compared to 12.3-12.5 A for hectorite which has not been exposed to TBP.

AB - The behaviour of organic complexes of actinides and lanthanides in clays plays an important role in environmental remediation. Application of 31P NMR to distinguish Eu(NO)3)3-complexed tributyl phosphate from uncomplexed tributyl phosphate (TBP) facilitates an understanding of the fate of these species in the clay hectorite. Solution 31P NMR studies show dramatic shifts of -156.0 to -172.9 ppm for Eu(NO3)36H2O dissolved in TBP at TBP:Eu ratios 1:1 to 1:2.5. Pure TBP exhibits 31P chemical shift of -0.3 ppm. Mixtures with higher TBP:Eu ratios display lines progressively downfield of -156.0 ppm, reflecting exchange of complexed and free TBP. The Eu(NO3)3-complexed TBP adsorbed into hectorite displays a 31P chemical shift of -180.7 to -193.8 ppm. Clays adsorbed with solutions that are 3.1, 5:1 and 7:1 TBP:Eu display peaks due to complex as well as peaks in the range -4 to -6 ppm attributed to uncomplexed TBP. No evidence of exchange is observed. Spectra of the TBP-adsorbed clay give a TBP line at -0.7 ppm which changes slightly to --5.0 after exchange with Eu(NO3)3. The Eu(NO3)3-exchanged hectorite displays a line at -17.6 ppm after adsorption of TBP. Neither of the latter two samples show indication of complex formation. The hectorite samples exposed to TBP or the complex display (001) d spacings of 17.9-18.4 A compared to 12.3-12.5 A for hectorite which has not been exposed to TBP.

UR - http://www.scopus.com/inward/record.url?scp=0029276435&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029276435&partnerID=8YFLogxK

U2 - 10.1021/j100012a048

DO - 10.1021/j100012a048

M3 - Article

AN - SCOPUS:0029276435

SN - 0022-3654

VL - 99

SP - 4205

EP - 4210

JO - Journal of physical chemistry

JF - Journal of physical chemistry

IS - 12

ER -

Sequestration of the tributyl phosphate complex of europium nitrate in the clay hectorite. A ³¹P NMR study

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this