TY - JOUR
T1 - Application of a Novel Phosphonium-Based Ionic Liquid to the Separation of Platinum Group Metals from Automobile Catalyst Leach Liquor
AU - Firmansyah, Mochamad L.
AU - Kubota, Fukiko
AU - Yoshida, Wataru
AU - Goto, Masahiro
N1 - Funding Information:
This work was supported by Grants-in-Aid for Science Research (No. JP16K0830) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and the Environment Research and Technology Development Fund (ERTDF, No. 3-1710) of the Ministry of the Environment, Japan. Mochamad L Firmansyah is grateful for the Scholarship provided by the Ministry of Education, Science, Sports and Culture of Japan (MEXT ID: 163644). We thank Michael D. Judge, MSc, from Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/3/6
Y1 - 2019/3/6
N2 - The recovery of platinum group metals (PGMs) from automotive exhaust catalysts is important, and hydrometallurgical extraction is an effective approach. In the present study, a newly designed phosphonium-based ionic liquid (IL) was applied to the separation and recovery of PGMs from an automobile catalyst leach liquor in conjunction with varying pH levels. This IL, trioctyldodecyl phosphonium chloride (P8,8,8,12Cl), allows quantitative extraction of Pd(II) at any HCl concentration, with almost 80% removal of Rh(III) at 1 mol L-1 HCl after two extractions. Significant amounts of Fe(III) were extracted into the IL phase, but could be removed using 1 mol L-1 Na2SO3. The Pd(II) and Rh(III) were selectively recovered from the IL using 1 mol L-1 CS(NH2)2 and 5 mol L-1 HCl, respectively. This work therefore demonstrated the selective recovery of PGMs through optimization of various parameters and shows the significant potential of this IL with regard to recycling PGMs from leach liquor.
AB - The recovery of platinum group metals (PGMs) from automotive exhaust catalysts is important, and hydrometallurgical extraction is an effective approach. In the present study, a newly designed phosphonium-based ionic liquid (IL) was applied to the separation and recovery of PGMs from an automobile catalyst leach liquor in conjunction with varying pH levels. This IL, trioctyldodecyl phosphonium chloride (P8,8,8,12Cl), allows quantitative extraction of Pd(II) at any HCl concentration, with almost 80% removal of Rh(III) at 1 mol L-1 HCl after two extractions. Significant amounts of Fe(III) were extracted into the IL phase, but could be removed using 1 mol L-1 Na2SO3. The Pd(II) and Rh(III) were selectively recovered from the IL using 1 mol L-1 CS(NH2)2 and 5 mol L-1 HCl, respectively. This work therefore demonstrated the selective recovery of PGMs through optimization of various parameters and shows the significant potential of this IL with regard to recycling PGMs from leach liquor.
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U2 - 10.1021/acs.iecr.8b05848
DO - 10.1021/acs.iecr.8b05848
M3 - Article
AN - SCOPUS:85062599283
SN - 0888-5885
VL - 58
SP - 3845
EP - 3852
JO - Industrial & Engineering Chemistry Research
JF - Industrial & Engineering Chemistry Research
IS - 9
ER -