Imperial College London
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Professor Sue Grimes

Faculty of Engineering, Department of Civil and Environmental Engineering

RAEng Chair in Waste & Resource Management
 
 
 
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Contact

 

+44 (0)20 7594 5966s.grimes

 
 
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Location

 

233Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Schaeffer:2017:10.1002/jctb.5297,
author = {Schaeffer, N and Feng, X and Grimes, SM and Cheeseman, C},
doi = {10.1002/jctb.5297},
journal = {Journal of chemical technology and biotechnology},
pages = {2731--2738},
title = {Recovery of an yttrium europium oxide phosphor from waste fluorescent tubes using a Brønsted acidic ionic liquid, 1-methylimidazolium hydrogen sulfate},
url = {http://dx.doi.org/10.1002/jctb.5297},
volume = {92},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - BACKGROUNDSpent fluorescent lamps, classified as hazardous waste in the EU, are segregated at source. Processes for the recovery of critical rare-earth (RE) elements from the phosphor powder waste, however, often involve use of aggressive acid or alkali digestion, multi-stage separation procedures, and production of large aqueous waste streams which require further treatment.RESULTSTo overcome these difficulties phosphor powder pre-treated with dilute HCl was leached with a 1:1 wt. [Hmim][HSO4]:H2O solution at a solid:liquid ratio of 5%, at 80 °C for 4 h with stirring at 300 rpm to recover 91.6 wt% of the Y and 97.7 wt% of the Eu present. The yttrium-europium oxide (YOX), (Y0.95Eu0.05)2O3, recovered by precipitating the dissolved RE elements from the leach solution with oxalic acid and converting the oxalate to an oxide phase by heating, was characterised by FTIR, XRD and luminescence analysis. The analyses suggest the recovered oxide has the potential to be directly reused as YOX phosphor. Regeneration and reuse of the ionic liquid is achieved with only minor leaching efficiency losses found over four leaching/recovery cycles.CONCLUSIONThe recovery of yttrium europium oxide from waste fluorescent tube phosphor by a simple efficient low cost ionic liquid process has been developed.
AU  - Schaeffer,N
AU  - Feng,X
AU  - Grimes,SM
AU  - Cheeseman,C
DO  - 10.1002/jctb.5297
EP  - 2738
PY  - 2017///
SN  - 0142-0356
SP  - 2731
TI  - Recovery of an yttrium europium oxide phosphor from waste fluorescent tubes using a Brønsted acidic ionic liquid, 1-methylimidazolium hydrogen sulfate
T2  - Journal of chemical technology and biotechnology
UR  - http://dx.doi.org/10.1002/jctb.5297
UR  - http://hdl.handle.net/10044/1/47895
VL  - 92
ER  -
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