X-ray absorption spectroscopy study of solvation and ion-pairing in aqueous gallium bromide solutions at supercritical conditions

被引：20

作者：

Da Silva, Cecile ^{[2
]}

Proux, Olivier ^{[1
]}

Hazemann, Jean-Louis ^{[2
]}

James-Smith, Julianne ^{[2
,3
]}

Testemale, Denis ^{[2
]}

Yamaguchi, Toshio ^{[4
,5
]}

机构：

[1] Univ Grenoble 1, CNRS, UMR, Lab Geophys Interne & Tectonophys, F-38041 Grenoble, France

[2] CNRS, Inst Neel, Grenoble, France

[3] Univ Adelaide, Sch Earth & Environm Studies, Adelaide, SA 5005, Australia

[4] Fukuoka Univ, Fac Sci, Dept Chem, Fukuoka, Japan

[5] Fukuoka Univ, Fac Sci, Adv Mat Inst, Fukuoka, Japan

来源：

JOURNAL OF MOLECULAR LIQUIDS | 2009年 / 147卷 / 1-2期

关键词：

Gallium bromide solution; Ion solvation; Ion-pairing; Supercritical fluids; 300; DEGREES-C; FINE-STRUCTURE; MOLECULAR-DYNAMICS; HYDROTHERMAL SOLUTIONS; CHLORO COMPLEXES; K-EDGE; EXAFS; WATER; SPECIATION; HYDRATION;

D O I：

10.1016/j.molliq.2008.06.022

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

X-ray absorption spectroscopy measurements have been performed both at the Ga and Br K-edges on aqueous GaBr3 Solutions. The isobaric experiments have been recorded at 30 MPa from ambient temperature to 670 K for two GaBr3 concentrations (0.017 and 0.17 mol/dm(3)). At room temperature, Ga3+ and Br- ions are fully solvated, surrounded by water O atoms at 1.97 angstrom (Ga-O) and 3.37 angstrom (Br-O). When the temperature is elevated, Ga3+ cations precipitate as gallium oxy-hydroxide colloids while Br- anions remain solvated. With a further increase in temperature, the gallium solid precipitates remarkably re-dissolved (25% and 50% for 0.017 and 0.17 mol/dm(3) respectively), due to the formation of [GaBrn(H2O)(4 - n)]((aq))(3 - n) (n = 2, 3 or 4) tetrahedral complexes. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：83 / 95

页数：13

共 38 条

[1] Supercritical extraction of contaminants from soils and sediments
Anitescu, G.
Tavlarides, L. L.
[J]. JOURNAL OF SUPERCRITICAL FLUIDS, 2006, 38 (02) : 167 - 180
[2] Gallium speciation in aqueous solution. Experimental study and modelling .2. Solubility of alpha-GaOOH in acidic solutions from 150 to 250 degrees C and hydrolysis constants of gallium (III) to 300 degrees C
Benezeth, P
Diakonov, II
Pokrovski, GS
Dandurand, JL
Schott, J
Khodakovsky, IL
[J]. GEOCHIMICA ET COSMOCHIMICA ACTA, 1997, 61 (07) : 1345 - 1357
[3] A new pressure regulation device using high pressure isolation valves
Bruyere, R.
Prat, A.
Goujon, C.
Hazemann, J-L
[J]. JOINT 21ST AIRAPT AND 45TH EHPRG INTERNATIONAL CONFERENCE ON HIGH PRESSURE SCIENCE AND TECHNOLOGY, 2008, 121
[4] The structure of the homogeneous oxidation catalyst, Mn(II)(Br-1)x, in supercritical water:: An X-ray absorption fine-structure study
Chen, YS
Fulton, JL
Partenheimer, W
[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2005, 127 (40) : 14085 - 14093
[5] HYDROLYTIC BEHAVIOR OF GALLIUM(3) PERCHLORATE
CRAIG, HR
TYREE, SY
[J]. INORGANIC CHEMISTRY, 1969, 8 (03) : 591 - &
[6] EXAFS and molecular dynamics studies of ionic solutions
D'Angelo, P
Pavel, NV
[J]. JOURNAL OF SYNCHROTRON RADIATION, 2001, 8 : 173 - 177
[7] DOUBLE-ELECTRON EXCITATION CHANNELS AT THE BR K-EDGE OF HBR AND BR2
DANGELO, P
DICICCO, A
FILIPPONI, A
PAVEL, NV
[J]. PHYSICAL REVIEW A, 1993, 47 (03): : 2055 - 2063
[8] Gallium speciation in aqueous solution. Experimental study and modelling .1. Thermodynamic properties of Ga(OH)(-)(4) to 300 degrees C
Diakonov, II
Pokrovski, GS
Benezeth, P
Schott, J
Dandurand, JL
Escalier, J
[J]. GEOCHIMICA ET COSMOCHIMICA ACTA, 1997, 61 (07) : 1333 - 1343
[9] Supercritical carbon dioxide extraction of metals from aqueous solutions: a review
Erkey, C
[J]. JOURNAL OF SUPERCRITICAL FLUIDS, 2000, 17 (03) : 259 - 287
[10] The quest for ion pairing in supercritical aqueous electrolytes
Ferlat, G
San Miguel, A
Jal, JF
Soetens, JC
Bopp, PA
Hazemann, JL
Testemale, D
Daniel, I
[J]. JOURNAL OF MOLECULAR LIQUIDS, 2002, 101 (1-3) : 127 - 136

← 1 2 3 4 →