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• Ongoing Research at USP Supramolecular Chemistry & Nanotechnology Molecular Devices – Dye Solar Cells, Sensors, Logic Gates Nano-Processes (Biocatalysis, Petroleum and Hydrometallurgy)
Henrique E. TomaSupramolecular Nanotech Lab
Univ.S.Paulo - USP
26,27/Novembro/2015CETEM - RJ
Ionic Resin processing
Superparamagnetic Nanoparticles
Magnet
MAGNETIC FLUIDS
HEAT EXCHANGE
ENVIROMENTAL USES
MICROCHANNELS FLOW
LUBRICATING PROPERTIES
MECHANICAL/ELECTRICALFLUIDS
Our main goal in the Rare Earths Proposal:
Applying magnetic nanohydrometallurgy (MNHM) for performing the capture, concentration and separation of the lanthanide elements from the concentrated (lixiviate) solutions
Strategy:
Developing engineered nanoparticles exbiting
strong superparamagnetic behavior,
great stability,
high concentration of selective complexing agents immobilized at the surface,
great performance in capturing and processing metal elements under green/economial conditions.
good recyclability, compatibility with the environment with a positive action in terms of sustainability
possibility of application in the recovery of elements from urban and industrial wastes
Element config.
M3+
�
(MB)
log KDTPA Monazite Bastnaesite Xenotime
Lanthanum, La 4f0 0 19.48 23 32 -
Cerium, Ce 4f1 2.51 20.50 46 50 -Praseodimium, Pr 4f2 2.56 21.07 5 4 -
Neodymium, Nd 4f3 3.4 21.7 19 13 -
Promecium, Pm 4f4 - - - - -
Samarium, Sm 4f5 1.74 22.34 3 0.5 1,2
Europium, Eu 4f6 8.48 22.39 0.1 0.1 0.01
Gadolinium, Gd 4f7 7.98 22.46 1,7 0.15 3.6
Terbium, Tb 4f8 9.77 22.71 0.16 - 1.0
Disprosium, Dy 4f9 10.83 22.82 0.5 0.12 7.5
Holmium, Ho 4f10 11.2 22.78 0.009 - 2.0
Erbium, Er 4f11 9.9 22.74 0.13 - 6.2
Tulium, Tm 4f12 7.61 22.72 0.01 - 1.27
Yterbium, Yb 4f13 22.62 0.06 0.015 6.0
Lutecium, Lu 4f14 0 22.44 0.006 - 0.63
Ytrium, Y 22.05 2 0.1 60
Scandium, Sc - - - -
Thorium, Th 28.78 9 0.1 0.5
Nanoparticles protection and functionalization
MagNP
SiO2
sequestering agent
lanthanide ion
Engineered magnetic nanoparticle forcapturing lanthanide ions
rapid, selective, stable high sequestering efficiency large density of sequestering groups recyclable acid/base process
Fe3O4@SiO2(EAPS)
Fe3O4@SiO2(EAPS)DTPA
Monitoring thecapture of lanthanidesby EDX-RF
Releasing the lanthanides withdiluted acids
Recovering thenanoparticles sequesteringagents
Laboratory scale, computer controlledautomatic process
MAGNETIC HYDROMETALLURGY/ELECTROWINNING
http://revistapesquisa.fapesp.br/2015/06/03/quimica-verde-2/
U.Condomitti, A.T.Silveira, G. W. Condomitti, S. H. Toma, K. Araki, H. E. Toma, Silver recovery using electrochemcally active magnetite coated carbon particles, Hydrometallurgy, 2014, 147-148, 241-25.
H. E. Toma, Magnetic nanohydrometallurgy: a nanotechnologial approach to elemental sustainability, Green Chem., 2015, 17, 2027-2041
References
H. E. Toma, Developing nanotechnological strategies for Green industrial processes, Pure Appl. Chem., 2013, 85, 1655-1669.
U. Condomitti, A. Zuin, A. T. Silveira, S. H. Toma, K. Araki, H. E. Toma, Superparamagneticcarbon electrodes: a versatile approch for performing magnetic couplec electrochemical analytis of Mercury ions. Electroanalysis, 2011, 23, 2569-2573.
U. Condomitti, A. Zuin, M. A. Novak, K. Araki, H. E. Toma, Magnetic coupled electrochemistry:Exploring superparamagnetic nanoparticles for capturing, transporting and concentrating trace amounts of analytes. U. Condomitti, A. Zuin, M. A. Novak, K. Araki, H. E. Toma, Electrochemistry Communications, 2011, 13, 72-74.
U. Comdomitti, A. Zuin. A. T. Silveira, K. Araki, H. E. Toma, Direct use of superparamagneticnanoparticles as elecctrode modifiers for the analysis of Mercury ions from aqueous solution and crude petroleum samples, J. Electroanal. Chem., 2011, 661, 72-76.
S.N.Almeida, H. E. Toma, Neodymium(III) and lanthanum(III) separation by magnetic nanohydrometallurgy using DTPA functionalized magnetite nanoparticles, Hydrometallurgy, 2015, in press.