PMID- 33107499
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20201105
LR  - 20201105
IS  - 1463-9084 (Electronic)
IS  - 1463-9076 (Linking)
VI  - 22
IP  - 42
DP  - 2020 Nov 14
TI  - Hydrophobic functional liquids based on trioctylphosphine oxide (TOPO) and 
      carboxylic acids.
PG  - 24744-24763
LID - 10.1039/d0cp02605k [doi]
AB  - Trioctylphosphine oxide (TOPO) is a hydrophobic extracting agent used in a number 
      of commercially important separations of valuable solutes from aqueous streams 
      (with examples ranging from lanthanides, through gallium, to carboxylic acids). 
      TOPO is traditionally used as a solute in kerosene, its extraction efficiency 
      limited by its solubility in the organic diluents. In this work, eighteen 
      hydrogen bond donors (HBDs) were screened for their capacity to liquefy TOPO, 
      employing strategies used to design deep eutectic solvents (DES). The selected 
      HBDs were all useful in separations and were designed to formulate solvent-free, 
      hydrophobic, bi-functional liquid extracting agents. Some TOPO:HBD mixtures 
      yielded hydrophobic liquids that offer potential to be extremely efficient 
      extractants, incorporating high intrinsic concentrations of TOPO. Following this 
      initial screening, two systems: TOPO:malonic acid and TOPO:levulinic acid, were 
      selected for detailed physico-chemical characterisation across their complete 
      compositional ranges. Phase diagrams, thermal stabilities and the mechanism of 
      thermal decomposition are reported, along with densities and insights from (31)P 
      NMR spectroscopic studies. The work was concluded with a proof-of-concept 
      demonstration of the use of the TOPO:malonic acid (2 : 1 mol ratio) mixture for 
      the extraction of gallium from acidic chloride feedstock (simulated pre-digestate 
      of zinc leach residue). The loading capacity of the TOPO:malonic acid extractant 
      was three orders of magnitude greater than that of the literature benchmark, 
      encouraging further application-oriented studies.
FAU - Byrne, Emily L
AU  - Byrne EL
AD  - The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's 
      University Belfast, David Keir Building, Stranmillis Road, Belfast BT9 5AG, UK. 
      m.swadzba-kwasny@qub.ac.uk j.holbrey@qub.ac.uk.
FAU - O'Donnell, Ruairi
AU  - O'Donnell R
FAU - Gilmore, Mark
AU  - Gilmore M
FAU - Artioli, Nancy
AU  - Artioli N
FAU - Holbrey, John D
AU  - Holbrey JD
FAU - Swadzba-Kwasny, Malgorzata
AU  - Swadzba-Kwasny M
LA  - eng
PT  - Journal Article
DEP - 20201027
PL  - England
TA  - Phys Chem Chem Phys
JT  - Physical chemistry chemical physics : PCCP
JID - 100888160
SB  - IM
EDAT- 2020/10/28 06:00
MHDA- 2020/10/28 06:01
CRDT- 2020/10/27 08:41
PHST- 2020/10/28 06:00 [pubmed]
PHST- 2020/10/28 06:01 [medline]
PHST- 2020/10/27 08:41 [entrez]
AID - 10.1039/d0cp02605k [doi]
PST - ppublish
SO  - Phys Chem Chem Phys. 2020 Nov 14;22(42):24744-24763. doi: 10.1039/d0cp02605k. 
      Epub 2020 Oct 27.