The Structure of Nickel Chloride in the Ionic Liquid 1-Ethyl-3-methyl Imidazolium Chloride/Aluminum Chloride: X-ray Absorption Spectroscopy

2011 ◽  
Vol 158 (3) ◽  
pp. F21 ◽  
Author(s):  
D. F. Roeper ◽  
K. I. Pandya ◽  
G. T. Cheek ◽  
W. E. O’Grady
Keyword(s):  
Ionic Liquid ◽  
Absorption Spectroscopy ◽  
Aluminum Chloride ◽  
Nickel Chloride ◽  
Imidazolium Chloride ◽  
X Ray ◽  
X Ray Absorption

X-ray Absorption Spectroscopy of Nickel Oxide in 1-Ethyl-3-Methyl Imidazolium Chloride/Aluminum Chloride

2017 ◽  
Vol 80 (10) ◽  
pp. 567-581
Author(s):  
Donald Roeper ◽  
Graham T. Cheek ◽  
Kaumudi I. Pandya ◽  
William E. O'Grady
Keyword(s):  
Nickel Oxide ◽  
Absorption Spectroscopy ◽  
Aluminum Chloride ◽  
Imidazolium Chloride ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Mercury capture on a supported chlorocuprate(ii) ionic liquid adsorbent studied using operando synchrotron X-ray absorption spectroscopy

2016 ◽  
Vol 45 (47) ◽  
pp. 18946-18953 ◽  
Author(s):  
Roberto Boada ◽  
Giannantonio Cibin ◽  
Fergal Coleman ◽  
Sofia Diaz-Moreno ◽  
Diego Gianolio ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
Mercury Capture ◽  
X Ray Absorption

Oxidation and comproportionation mechanisms for mercury capture are identified.

Recovery of nanosize zinc from phosphor wastes with an ionic liquid

2009 ◽  
Vol 6 (3) ◽  
pp. 268 ◽  
Author(s):  
Hsin-Liang Huang ◽  
H. Paul Wang ◽  
Edward M. Eyring ◽  
Juu-En Chang
Keyword(s):  
Ionic Liquid ◽  
Absorption Spectroscopy ◽  
Room Temperature ◽  
Bond Distance ◽  
Extraction Process ◽  
Room Temperature Ionic Liquid ◽  
Zns Nanoparticles ◽  
Recovery Method ◽  
X Ray ◽  
X Ray Absorption

Environmental context. Very fine phosphor ashes are discharged from particulate collection systems (such as bag houses) in the cathode ray tube or television disassembling processes. Effective recovery of ZnO and ZnS nanoparticles from the phosphor ash can be achieved by extraction with a room temperature ionic liquid. By synchrotron radiation X-ray absorption spectroscopy, the obtained molecular scale data turn out to be very useful in revealing speciation of zinc in the extraction process, which also facilitates the development of a simple nanoparticle recovery method. Abstract. An effective, simple method has been developed for the recovery of ZnO and ZnS nanoparticles from hazardous phosphor ash waste. Experimentally, zinc (77%) in the phosphor ash (that contains mainly zinc (91%)) can be recovered by extraction with a room temperature ionic liquid (RTIL) ([C4mim][PF6], 1-butyl-3-methylimidazolium hexafluorophosphate). Component fitted X-ray absorption near edge structure (XANES) spectra of zinc indicate that metallic zinc (Zn) (9%) in the phosphor ash can be dissolved to form a Zn2+–1-methylimidazole ([mim]) complex during extraction with the RTIL. ZnS and ZnO nanoparticles (60–61%) can also be extracted from the phosphor. Over the 298–523 K temperature range, desired ZnO/ZnS ratios (0.3–0.6) can be obtained since interconversion of ZnS to ZnO in the RTIL is temperature dependent. The Fourier transformed extended X-ray absorption fine structure (EXAFS) data also show that the nanosize ZnS extracted in the RTIL possesses a Zn–S bond distance of 2.33 Å with coordination numbers (CNs) of 3.6–3.7. At 523 K, in the RTIL, ~30% of the ZnS is oxidised to form octahedral ZnO (with a bond distance of 2.10 Å and a CN of 6.1) that may coat the surfaces of the ZnS nanoparticles. This work exemplifies the utilisation of X-ray absorption spectroscopy (EXAFS and XANES) to reveal speciation and possible reaction pathways in a nanoparticle extraction process (with a RTIL) in detail.

An XAFS Study of Nickel Chloride in the Ionic Liquid 1-Ethyl-3-Methyl Imidazolium Chloride/ Aluminum Chloride

2019 ◽  
Vol 11 (23) ◽  
pp. 29-36 ◽  
Author(s):  
Donald Roeper ◽  
Graham T. Cheek ◽  
Kumi Pandya ◽  
William O'Grady
Keyword(s):  
Ionic Liquid ◽  
Aluminum Chloride ◽  
Nickel Chloride ◽  
Imidazolium Chloride

XAFS studies of Ni, Ta, and Nb chlorides in the ionic liquid 1-ethyl-3-methyl imidazolium chloride/aluminum chloride

2011 ◽  
Vol 26 (2) ◽  
pp. 171-175 ◽  
Author(s):  
W. E. O’Grady ◽  
D. F. Roeper ◽  
K. I. Pandya ◽  
G. T. Cheek
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Acidic Solution ◽  
Chloride Ions ◽  
Basic Solution ◽  
Imidazolium Chloride ◽  
X Ray ◽  
Strong Lewis Acid ◽  
X Ray Absorption

The structures of anhydrous nickel, niobium, and tantalum chlorides have been investigated in situ in acidic and basic ionic liquids (ILs) of 1-methyl-3-ethylimidazolium chloride (EMIC)/AlCl3 with X-ray absorption spectroscopy (XAS). The coordination of NiCl2 changes from tetrahedral in basic solution to octahedral in acidic solution. The NiCl2 is a strong Lewis acid in that it can induce the AlCl3 to share its chlorides in the highly acidic IL, forming a structure with six near Cl− ions and eight further distant Al ions which share the chloride ions surrounding the Ni2+. When Nb2Cl10, a dimer, is added to the acidic or basic solution, the dimer breaks apart and forms two species. In the acid solution, two trigonal bipyramids are formed with five equal chloride distances, while in the basic solution, a square pyramid with four chlorides forming a square base and one shorter axial chloride bond. Ta2Cl10 is also a dimer and divides into half in the acidic solution and forms two trigonal bipyramids. In the basic solution, the dimer breaks apart but the species formed is sufficiently acidic that it attracts two additional chloride ions and forms a seven coordinated tantalum species.

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