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European institute of membranes , ENSCM-CNRS-UM, Montpellier, France Email. [email protected] Engineering of nanomaterials and interfaces for water treatment applications Mikhael BECHELANY
European institute of membranes , ENSCM-CNRS-UM, Montpellier, FranceEmail. [email protected]
Engineering of nanomaterials and interfaces for water
treatment applications
Mikhael BECHELANY
« A film used the one hand to separate two media by avoiding direct contact or mixing and, on the other hand, to favor the exchange of one or several well defined extensive quantities between
them. »
Membrane : definition...
Retentate
Permeate
Permeate
Feed
Membrane
DP
Support
Researches :
Synthesis, Modification, Membrane Characterization
Mechanisms & Transport Modeling
Prospects in Process Development
Implementation Fields of IEM Researches :
Industry & Food Processing Chemistry
Health, Medicine Drug Environment, Fight against Pollution
Water and Urban Effluents Treatment Gas Treatment and Separation
Energy
Cross-section
of membrane
Tubular membranes
3 main research areas
Atomic Layer Deposition G/GO/h-BN
Electrospinning/Electrodeposition/Anodisation/3D Printing
5 Home-made ALD setups (LTALD, HTALD and PEALD) Atomic layer deposition
Oxides (i.e. ZnO, TiO2, Al2O3, SnO2 etc. )
Non-oxides (i.e. Nitrides: BN, TiN, AlN)
Metallic Nanoparticles (Pt, Pd, Ni, Ir, Ru)
One Cycle of ALD:
Step 1 :Pulse precursor 1
Step 2 : Exposure + Purge
Step 3 : Pulse precursor 2
Step 4 : Exposure + PurgeTheoretically ->1 monolayer
Conformal coating
Why Atomic layer deposition?
Pores number (single and multipores)Pores length and shapePores diameterDifferent materials (oxides, non-oxides and metals)Surface chargesHydrophobic/hydrophilicDifferent chemical functions
-Si-CH3
-Si-(CH2)2-CH3
-Si-(CH2)3-NH2
Tuning the membranes by ALDTubular Membranes
Chem Mater 2018 30 21 7368
Membrane applications
Single nanopore
DNA sensingIon conductivity
Multiporestuning
Gas separation
Desalination
Mass spectroscopy
Osmotic Energy harvesting
NPs sensing
Water treatment
Chem Mater 2018 30 21 7368
ALD for membrane tuning
Boron nitride by ALDBBr3 & NH3 at 750°C
Growth per cycle = 0.08 nm
BN: uniform & conform
Alumina membranes
Turbostratic BN
ACS Appl Mater Interfaces 2017 9 16669
CrystEngComm 2017 19 6089
Osmotic Energy
BN nanoporous membranes: Surface charge density of 0.1 C.m-2
ACS Appl Mater Interfaces 2017 9 16669
BN NTs for water purification
Tunable BN NTS: BN nanotubes with controllable diameters NTs absorb up to 110 times their weight in oil while repelling water
Adv Mater Interfaces 2018 1800056
ALD for conductive carbon
membranes
Cathode:
(Carbon Felt)
Anode: Pt+
Oxygen
O2 + 2H+ + 2e- → H2O2
Biorefractory
pollutants
Fenton reaction: Fe2+ + H2O2 → Fe(OH)2+ + •OH
•OH powerful oxidant for mineralization of
persistent organic pollutants
Carbon 2017 122 564
Fuel Cell-Fenton system
CF-pC cathode presentselectrocatalyticproperties for O2
reduction into H2O2
CF@Au anode presentselectrocatalyticproperties for glucose oxidation
e-
e- e-
e-
CF-pCCF@Au
Carbon felt (CF)
J Mater Chem A 2016 4 17686
Fuel Cell-Fenton system
CF-ZIF-
8/ZnOCF-pC
Element at % CF-pC
C 96
O 4
Total: 100.00
Raw-CF
Magnification
EDX results prove Zinc
evaporation
10 µm10 µm
10 µm
2 µm
1) ALD of ZnO
2) Solvothermal
conversion
of ZnO
3)
1000°C, 10h
N2
10 µm
XRD
CF@ZIF-8/ZnO
CF@pC
Cathodic electrode (CF@pC)
Volumetry Gas Adsorption of N2:
Contact angle measurements of water drop
Sample raw-CF CF-pC
Angle (°) 89.9 0
Propertie Hydrophobic Hydrophilic
XPS
Polarization curves
Positive shift for
ORR (0.4V)
• Raw-CF: 0.0915 m²/g
• CF-pC: 64 m²/g (pore volume =0.082
cm2/g) → 700 times higher
O2 + 2H+ + 2e- → H2O2
J Mater Chem A 2016 4 17686
Cathodic electrode (CF@pC)
CF@pC cathode
presents electrocatalytic
properties for O2
reduction into H2O2
CF@Au anode presents
electrocatalytic
properties for glucose
oxidation
e-
e- e-
e-
CF@pCCF@Au
170 mW m-2
EF process
J Mater Chem A 2016 4 17686
Fuel Cell-Fenton system
Invited ResearcherDzmitry SODZEL
Alla TERESCHENKOJulia OGORODNIICHUK
Roman VITERJean-Baptiste MORIN
Loïc DELAYESarah HAMMOUCHE
Jules BUSSIERESVincent GUILBERT
Jean Charles ALEXANDREMargarita BAITIMIROVA
Socrates RADHAKRISHNANAndrea MERENDAKwalene KUMENEPélagie KAMGANG
Collaborations & FundingPostdocs
Antoine BOYERMatthieu WEBER
Amr Ahmed NADAAhmed BARHOUM
Massomeh GHORBANLOOSakthivel NAGARAJAN
Vidhyadevi THANGARAJ
S. BalmeD. CornuM. CretinP. Miele
PhDAdib ABOU CHAAYA
Mathilde LEPOITEVINLe Thi Xuan HUONGVictoria FEDORENKO
Chantal KARAMMaryline NASR
Dánae González ORTIZHabib BELAID
Octavio GRANIELSarah KAWRANIMaya ABDALLAH
Aude ROLANDMarlène TAMER
Syreina EL SAYEGHGbenro FOLARANMI
Carole BAROUAdam MIREKFida TANOS
